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* [syzbot] KASAN: use-after-free Read in io_fallback_tw
@ 2023-01-12 10:12 syzbot
  2023-01-12 10:37 ` Pavel Begunkov
  2023-01-12 15:24 ` syzbot
  0 siblings, 2 replies; 6+ messages in thread
From: syzbot @ 2023-01-12 10:12 UTC (permalink / raw)
  To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    0a093b2893c7 Add linux-next specific files for 20230112
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11419c5e480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
dashboard link: https://syzkaller.appspot.com/bug?extid=ebcc33c1e81093c9224f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]

==================================================================
BUG: KASAN: use-after-free in io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1249
Read of size 8 at addr ffff88804ae3f088 by task syz-executor.0/9602

CPU: 0 PID: 9602 Comm: syz-executor.0 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:306 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:417
 kasan_report+0xc0/0xf0 mm/kasan/report.c:517
 io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1249
 tctx_task_work.cold+0xf/0x2c io_uring/io_uring.c:1219
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xb17/0x2a90 kernel/exit.c:867
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
 get_signal+0x225f/0x24f0 kernel/signal.c:2859
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd3d3a8c0c9
Code: Unable to access opcode bytes at 0x7fd3d3a8c09f.
RSP: 002b:00007fd3d47c8218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd3d3babf88 RCX: 00007fd3d3a8c0c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd3d3babf88
RBP: 00007fd3d3babf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd3d3babf8c
R13: 00007fffea21180f R14: 00007fd3d47c8300 R15: 0000000000022000
 </TASK>

Allocated by task 9602:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:769 [inline]
 kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033
 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
 io_alloc_req_refill io_uring/io_uring.h:348 [inline]
 io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 9123:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
 io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737
 io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967
 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
 worker_thread+0x669/0x1090 kernel/workqueue.c:2440
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff88804ae3f000
 which belongs to the cache io_kiocb of size 216
The buggy address is located 136 bytes inside of
 216-byte region [ffff88804ae3f000, ffff88804ae3f0d8)

The buggy address belongs to the physical page:
page:ffffea00012b8fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ae3f
memcg:ffff88807dd24601
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff88801c182b40 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff88807dd24601
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 8866, tgid 8865 (syz-executor.2), ts 589707217229, free_ts 589630456902
 prep_new_page mm/page_alloc.c:2549 [inline]
 get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x350 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __kmem_cache_alloc_bulk mm/slub.c:3951 [inline]
 kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026
 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
 io_alloc_req_refill io_uring/io_uring.h:348 [inline]
 io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1451 [inline]
 free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page_list+0x176/0xcd0 mm/page_alloc.c:3528
 release_pages+0xcb1/0x1330 mm/swap.c:1072
 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu mm/mmu_gather.c:299 [inline]
 tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391
 exit_mmap+0x202/0x7c0 mm/mmap.c:3100
 __mmput+0x128/0x4c0 kernel/fork.c:1212
 mmput+0x60/0x70 kernel/fork.c:1234
 exit_mm kernel/exit.c:563 [inline]
 do_exit+0x9ac/0x2a90 kernel/exit.c:854
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
 __do_sys_exit_group kernel/exit.c:1023 [inline]
 __se_sys_exit_group kernel/exit.c:1021 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88804ae3ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804ae3f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804ae3f080: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
                      ^
 ffff88804ae3f100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff88804ae3f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at [email protected].

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [syzbot] KASAN: use-after-free Read in io_fallback_tw
  2023-01-12 10:12 [syzbot] KASAN: use-after-free Read in io_fallback_tw syzbot
@ 2023-01-12 10:37 ` Pavel Begunkov
  2023-01-12 10:39   ` syzbot
  2023-01-12 15:24 ` syzbot
  1 sibling, 1 reply; 6+ messages in thread
From: Pavel Begunkov @ 2023-01-12 10:37 UTC (permalink / raw)
  To: syzbot, axboe, io-uring, linux-kernel, syzkaller-bugs

On 1/12/23 10:12, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    0a093b2893c7 Add linux-next specific files for 20230112
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=11419c5e480000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
> dashboard link: https://syzkaller.appspot.com/bug?extid=ebcc33c1e81093c9224f
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.

#syz test: git://git.kernel.dk/linux.git syztest

> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email protected]
> 
> ==================================================================
> BUG: KASAN: use-after-free in io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1249
> Read of size 8 at addr ffff88804ae3f088 by task syz-executor.0/9602
> 
> CPU: 0 PID: 9602 Comm: syz-executor.0 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
> Call Trace:
>   <TASK>
>   __dump_stack lib/dump_stack.c:88 [inline]
>   dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
>   print_address_description mm/kasan/report.c:306 [inline]
>   print_report+0x15e/0x45d mm/kasan/report.c:417
>   kasan_report+0xc0/0xf0 mm/kasan/report.c:517
>   io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1249
>   tctx_task_work.cold+0xf/0x2c io_uring/io_uring.c:1219
>   task_work_run+0x16f/0x270 kernel/task_work.c:179
>   exit_task_work include/linux/task_work.h:38 [inline]
>   do_exit+0xb17/0x2a90 kernel/exit.c:867
>   do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
>   get_signal+0x225f/0x24f0 kernel/signal.c:2859
>   arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
>   exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
>   exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
>   __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
>   syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
>   do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7fd3d3a8c0c9
> Code: Unable to access opcode bytes at 0x7fd3d3a8c09f.
> RSP: 002b:00007fd3d47c8218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
> RAX: fffffffffffffe00 RBX: 00007fd3d3babf88 RCX: 00007fd3d3a8c0c9
> RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd3d3babf88
> RBP: 00007fd3d3babf80 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd3d3babf8c
> R13: 00007fffea21180f R14: 00007fd3d47c8300 R15: 0000000000022000
>   </TASK>
> 
> Allocated by task 9602:
>   kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
>   kasan_set_track+0x25/0x30 mm/kasan/common.c:52
>   __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
>   kasan_slab_alloc include/linux/kasan.h:186 [inline]
>   slab_post_alloc_hook mm/slab.h:769 [inline]
>   kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033
>   __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
>   io_alloc_req_refill io_uring/io_uring.h:348 [inline]
>   io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
>   __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>   do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> Freed by task 9123:
>   kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
>   kasan_set_track+0x25/0x30 mm/kasan/common.c:52
>   kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
>   ____kasan_slab_free mm/kasan/common.c:236 [inline]
>   ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
>   kasan_slab_free include/linux/kasan.h:162 [inline]
>   slab_free_hook mm/slub.c:1781 [inline]
>   slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
>   slab_free mm/slub.c:3787 [inline]
>   kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
>   io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737
>   io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967
>   process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
>   worker_thread+0x669/0x1090 kernel/workqueue.c:2440
>   kthread+0x2e8/0x3a0 kernel/kthread.c:376
>   ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
> 
> The buggy address belongs to the object at ffff88804ae3f000
>   which belongs to the cache io_kiocb of size 216
> The buggy address is located 136 bytes inside of
>   216-byte region [ffff88804ae3f000, ffff88804ae3f0d8)
> 
> The buggy address belongs to the physical page:
> page:ffffea00012b8fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ae3f
> memcg:ffff88807dd24601
> flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
> raw: 00fff00000000200 ffff88801c182b40 dead000000000122 0000000000000000
> raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff88807dd24601
> page dumped because: kasan: bad access detected
> page_owner tracks the page as allocated
> page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 8866, tgid 8865 (syz-executor.2), ts 589707217229, free_ts 589630456902
>   prep_new_page mm/page_alloc.c:2549 [inline]
>   get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
>   __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
>   alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
>   alloc_slab_page mm/slub.c:1851 [inline]
>   allocate_slab+0x25f/0x350 mm/slub.c:1998
>   new_slab mm/slub.c:2051 [inline]
>   ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
>   __kmem_cache_alloc_bulk mm/slub.c:3951 [inline]
>   kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026
>   __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
>   io_alloc_req_refill io_uring/io_uring.h:348 [inline]
>   io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
>   __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>   do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
> page last free stack trace:
>   reset_page_owner include/linux/page_owner.h:24 [inline]
>   free_pages_prepare mm/page_alloc.c:1451 [inline]
>   free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
>   free_unref_page_prepare mm/page_alloc.c:3387 [inline]
>   free_unref_page_list+0x176/0xcd0 mm/page_alloc.c:3528
>   release_pages+0xcb1/0x1330 mm/swap.c:1072
>   tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97
>   tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
>   tlb_flush_mmu mm/mmu_gather.c:299 [inline]
>   tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391
>   exit_mmap+0x202/0x7c0 mm/mmap.c:3100
>   __mmput+0x128/0x4c0 kernel/fork.c:1212
>   mmput+0x60/0x70 kernel/fork.c:1234
>   exit_mm kernel/exit.c:563 [inline]
>   do_exit+0x9ac/0x2a90 kernel/exit.c:854
>   do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
>   __do_sys_exit_group kernel/exit.c:1023 [inline]
>   __se_sys_exit_group kernel/exit.c:1021 [inline]
>   __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021
>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>   do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> Memory state around the buggy address:
>   ffff88804ae3ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>   ffff88804ae3f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> ffff88804ae3f080: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
>                        ^
>   ffff88804ae3f100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>   ffff88804ae3f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at [email protected].
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

-- 
Pavel Begunkov

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [syzbot] KASAN: use-after-free Read in io_fallback_tw
  2023-01-12 10:37 ` Pavel Begunkov
@ 2023-01-12 10:39   ` syzbot
  0 siblings, 0 replies; 6+ messages in thread
From: syzbot @ 2023-01-12 10:39 UTC (permalink / raw)
  To: asml.silence; +Cc: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs

> On 1/12/23 10:12, syzbot wrote:
>> Hello,
>> 
>> syzbot found the following issue on:
>> 
>> HEAD commit:    0a093b2893c7 Add linux-next specific files for 20230112
>> git tree:       linux-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=11419c5e480000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
>> dashboard link: https://syzkaller.appspot.com/bug?extid=ebcc33c1e81093c9224f
>> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>> 
>> Unfortunately, I don't have any reproducer for this issue yet.
>
> #syz test: git://git.kernel.dk/linux.git syztest

This crash does not have a reproducer. I cannot test it.

>
>> 
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz
>> 
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: [email protected]
>> 
>> ==================================================================
>> BUG: KASAN: use-after-free in io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1249
>> Read of size 8 at addr ffff88804ae3f088 by task syz-executor.0/9602
>> 
>> CPU: 0 PID: 9602 Comm: syz-executor.0 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
>> Call Trace:
>>   <TASK>
>>   __dump_stack lib/dump_stack.c:88 [inline]
>>   dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
>>   print_address_description mm/kasan/report.c:306 [inline]
>>   print_report+0x15e/0x45d mm/kasan/report.c:417
>>   kasan_report+0xc0/0xf0 mm/kasan/report.c:517
>>   io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1249
>>   tctx_task_work.cold+0xf/0x2c io_uring/io_uring.c:1219
>>   task_work_run+0x16f/0x270 kernel/task_work.c:179
>>   exit_task_work include/linux/task_work.h:38 [inline]
>>   do_exit+0xb17/0x2a90 kernel/exit.c:867
>>   do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
>>   get_signal+0x225f/0x24f0 kernel/signal.c:2859
>>   arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
>>   exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
>>   exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
>>   __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
>>   syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
>>   do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
>>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
>> RIP: 0033:0x7fd3d3a8c0c9
>> Code: Unable to access opcode bytes at 0x7fd3d3a8c09f.
>> RSP: 002b:00007fd3d47c8218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
>> RAX: fffffffffffffe00 RBX: 00007fd3d3babf88 RCX: 00007fd3d3a8c0c9
>> RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd3d3babf88
>> RBP: 00007fd3d3babf80 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd3d3babf8c
>> R13: 00007fffea21180f R14: 00007fd3d47c8300 R15: 0000000000022000
>>   </TASK>
>> 
>> Allocated by task 9602:
>>   kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
>>   kasan_set_track+0x25/0x30 mm/kasan/common.c:52
>>   __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
>>   kasan_slab_alloc include/linux/kasan.h:186 [inline]
>>   slab_post_alloc_hook mm/slab.h:769 [inline]
>>   kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033
>>   __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
>>   io_alloc_req_refill io_uring/io_uring.h:348 [inline]
>>   io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
>>   __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
>>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>>   do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
>> 
>> Freed by task 9123:
>>   kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
>>   kasan_set_track+0x25/0x30 mm/kasan/common.c:52
>>   kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
>>   ____kasan_slab_free mm/kasan/common.c:236 [inline]
>>   ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
>>   kasan_slab_free include/linux/kasan.h:162 [inline]
>>   slab_free_hook mm/slub.c:1781 [inline]
>>   slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
>>   slab_free mm/slub.c:3787 [inline]
>>   kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
>>   io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737
>>   io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967
>>   process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
>>   worker_thread+0x669/0x1090 kernel/workqueue.c:2440
>>   kthread+0x2e8/0x3a0 kernel/kthread.c:376
>>   ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
>> 
>> The buggy address belongs to the object at ffff88804ae3f000
>>   which belongs to the cache io_kiocb of size 216
>> The buggy address is located 136 bytes inside of
>>   216-byte region [ffff88804ae3f000, ffff88804ae3f0d8)
>> 
>> The buggy address belongs to the physical page:
>> page:ffffea00012b8fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ae3f
>> memcg:ffff88807dd24601
>> flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
>> raw: 00fff00000000200 ffff88801c182b40 dead000000000122 0000000000000000
>> raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff88807dd24601
>> page dumped because: kasan: bad access detected
>> page_owner tracks the page as allocated
>> page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 8866, tgid 8865 (syz-executor.2), ts 589707217229, free_ts 589630456902
>>   prep_new_page mm/page_alloc.c:2549 [inline]
>>   get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
>>   __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
>>   alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
>>   alloc_slab_page mm/slub.c:1851 [inline]
>>   allocate_slab+0x25f/0x350 mm/slub.c:1998
>>   new_slab mm/slub.c:2051 [inline]
>>   ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
>>   __kmem_cache_alloc_bulk mm/slub.c:3951 [inline]
>>   kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026
>>   __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
>>   io_alloc_req_refill io_uring/io_uring.h:348 [inline]
>>   io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
>>   __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
>>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>>   do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
>> page last free stack trace:
>>   reset_page_owner include/linux/page_owner.h:24 [inline]
>>   free_pages_prepare mm/page_alloc.c:1451 [inline]
>>   free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
>>   free_unref_page_prepare mm/page_alloc.c:3387 [inline]
>>   free_unref_page_list+0x176/0xcd0 mm/page_alloc.c:3528
>>   release_pages+0xcb1/0x1330 mm/swap.c:1072
>>   tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97
>>   tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
>>   tlb_flush_mmu mm/mmu_gather.c:299 [inline]
>>   tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391
>>   exit_mmap+0x202/0x7c0 mm/mmap.c:3100
>>   __mmput+0x128/0x4c0 kernel/fork.c:1212
>>   mmput+0x60/0x70 kernel/fork.c:1234
>>   exit_mm kernel/exit.c:563 [inline]
>>   do_exit+0x9ac/0x2a90 kernel/exit.c:854
>>   do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
>>   __do_sys_exit_group kernel/exit.c:1023 [inline]
>>   __se_sys_exit_group kernel/exit.c:1021 [inline]
>>   __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021
>>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>>   do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
>> 
>> Memory state around the buggy address:
>>   ffff88804ae3ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>>   ffff88804ae3f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>> ffff88804ae3f080: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
>>                        ^
>>   ffff88804ae3f100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>>   ffff88804ae3f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> ==================================================================
>> 
>> 
>> ---
>> This report is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at [email protected].
>> 
>> syzbot will keep track of this issue. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> -- 
> Pavel Begunkov

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [syzbot] KASAN: use-after-free Read in io_fallback_tw
  2023-01-12 10:12 [syzbot] KASAN: use-after-free Read in io_fallback_tw syzbot
  2023-01-12 10:37 ` Pavel Begunkov
@ 2023-01-12 15:24 ` syzbot
  2023-01-12 17:42   ` Jens Axboe
  1 sibling, 1 reply; 6+ messages in thread
From: syzbot @ 2023-01-12 15:24 UTC (permalink / raw)
  To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs

syzbot has found a reproducer for the following issue on:

HEAD commit:    0a093b2893c7 Add linux-next specific files for 20230112
git tree:       linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=14b3995a480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
dashboard link: https://syzkaller.appspot.com/bug?extid=ebcc33c1e81093c9224f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11613181480000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=101a000e480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]

==================================================================
BUG: KASAN: use-after-free in io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1249
Read of size 8 at addr ffff88802b270448 by task syz-executor235/5078

CPU: 0 PID: 5078 Comm: syz-executor235 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:306 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:417
 kasan_report+0xc0/0xf0 mm/kasan/report.c:517
 io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1249
 tctx_task_work.cold+0xf/0x2c io_uring/io_uring.c:1219
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xb17/0x2a90 kernel/exit.c:867
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
 __do_sys_exit_group kernel/exit.c:1023 [inline]
 __se_sys_exit_group kernel/exit.c:1021 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f38f86551c9
Code: Unable to access opcode bytes at 0x7f38f865519f.
RSP: 002b:00007ffce433d688 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f38f86c9350 RCX: 00007f38f86551c9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f38f86c9350
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
 </TASK>

Allocated by task 5078:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:769 [inline]
 kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033
 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
 io_alloc_req_refill io_uring/io_uring.h:348 [inline]
 io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 33:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
 io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737
 io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967
 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
 worker_thread+0x669/0x1090 kernel/workqueue.c:2440
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff88802b2703c0
 which belongs to the cache io_kiocb of size 216
The buggy address is located 136 bytes inside of
 216-byte region [ffff88802b2703c0, ffff88802b270498)

The buggy address belongs to the physical page:
page:ffffea0000ac9c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b270
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff88801c4e3280 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5078, tgid 5078 (syz-executor235), ts 57698640196, free_ts 57658994184
 prep_new_page mm/page_alloc.c:2549 [inline]
 get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x350 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __kmem_cache_alloc_bulk mm/slub.c:3951 [inline]
 kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026
 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
 io_alloc_req_refill io_uring/io_uring.h:348 [inline]
 io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1451 [inline]
 free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page_list+0x176/0xcd0 mm/page_alloc.c:3528
 release_pages+0xcb1/0x1330 mm/swap.c:1072
 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu mm/mmu_gather.c:299 [inline]
 tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391
 exit_mmap+0x202/0x7c0 mm/mmap.c:3100
 __mmput+0x128/0x4c0 kernel/fork.c:1212
 mmput+0x60/0x70 kernel/fork.c:1234
 exec_mmap fs/exec.c:1034 [inline]
 begin_new_exec+0x1027/0x2f80 fs/exec.c:1293
 load_elf_binary+0x801/0x4ff0 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1736 [inline]
 exec_binprm fs/exec.c:1778 [inline]
 bprm_execve fs/exec.c:1853 [inline]
 bprm_execve+0x7fd/0x1ae0 fs/exec.c:1809
 do_execveat_common+0x72c/0x880 fs/exec.c:1960
 do_execve fs/exec.c:2034 [inline]
 __do_sys_execve fs/exec.c:2110 [inline]
 __se_sys_execve fs/exec.c:2105 [inline]
 __x64_sys_execve+0x93/0xc0 fs/exec.c:2105
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88802b270300: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
 ffff88802b270380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff88802b270400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88802b270480: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802b270500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [syzbot] KASAN: use-after-free Read in io_fallback_tw
  2023-01-12 15:24 ` syzbot
@ 2023-01-12 17:42   ` Jens Axboe
  2023-01-13  2:04     ` syzbot
  0 siblings, 1 reply; 6+ messages in thread
From: Jens Axboe @ 2023-01-12 17:42 UTC (permalink / raw)
  To: syzbot, asml.silence, io-uring, linux-kernel, syzkaller-bugs

On 1/12/23 8:24 AM, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    0a093b2893c7 Add linux-next specific files for 20230112
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=14b3995a480000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
> dashboard link: https://syzkaller.appspot.com/bug?extid=ebcc33c1e81093c9224f
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11613181480000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=101a000e480000

#syz test: git://git.kernel.dk/linux.git for-next

-- 
Jens Axboe



^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [syzbot] KASAN: use-after-free Read in io_fallback_tw
  2023-01-12 17:42   ` Jens Axboe
@ 2023-01-13  2:04     ` syzbot
  0 siblings, 0 replies; 6+ messages in thread
From: syzbot @ 2023-01-13  2:04 UTC (permalink / raw)
  To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: [email protected]

Tested on:

commit:         73f41663 Merge branch 'for-6.3/iter-ubuf' into for-next
git tree:       git://git.kernel.dk/linux.git for-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16cc1236480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2b6ecad960fc703e
dashboard link: https://syzkaller.appspot.com/bug?extid=ebcc33c1e81093c9224f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2023-01-13  2:04 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-01-12 10:12 [syzbot] KASAN: use-after-free Read in io_fallback_tw syzbot
2023-01-12 10:37 ` Pavel Begunkov
2023-01-12 10:39   ` syzbot
2023-01-12 15:24 ` syzbot
2023-01-12 17:42   ` Jens Axboe
2023-01-13  2:04     ` syzbot

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