Re: [syzbot] [io-uring?] kernel BUG in put_page

[Pavel Begunkov <asml.silence@gmail.com>]

On 4/2/24 09:47, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:

gmail decided to put it into spam, replying for visibility
in case I'm not the only one who missed it.



> HEAD commit:    c0b832517f62 Add linux-next specific files for 20240402
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1737bfb1180000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=afcaf46d374cec8c
> dashboard link: https://syzkaller.appspot.com/bug?extid=324f30025b9b5d66fab9
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ce85b1180000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=139fe0c5180000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/0d36ec76edc7/disk-c0b83251.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/6f9bb4e37dd0/vmlinux-c0b83251.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/2349287b14b7/bzImage-c0b83251.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+324f30025b9b5d66fab9@syzkaller.appspotmail.com
> 
>   reset_page_owner include/linux/page_owner.h:25 [inline]
>   free_pages_prepare mm/page_alloc.c:1110 [inline]
>   free_unref_page+0xd3c/0xec0 mm/page_alloc.c:2617
>   __folio_put_small mm/swap.c:119 [inline]
>   __folio_put+0x22b/0x390 mm/swap.c:142
>   io_mem_alloc_single io_uring/memmap.c:55 [inline]
>   io_pages_map+0x25a/0x480 io_uring/memmap.c:76
>   io_allocate_scq_urings+0x3b8/0x640 io_uring/io_uring.c:3432
>   io_uring_create+0x741/0x12f0 io_uring/io_uring.c:3590
>   io_uring_setup io_uring/io_uring.c:3702 [inline]
>   __do_sys_io_uring_setup io_uring/io_uring.c:3729 [inline]
>   __se_sys_io_uring_setup+0x2ba/0x330 io_uring/io_uring.c:3723
>   do_syscall_64+0xfb/0x240
>   entry_SYSCALL_64_after_hwframe+0x72/0x7a
> ------------[ cut here ]------------
> kernel BUG at include/linux/mm.h:1135!
> Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
> CPU: 0 PID: 5084 Comm: syz-executor990 Not tainted 6.9.0-rc2-next-20240402-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
> RIP: 0010:put_page_testzero include/linux/mm.h:1135 [inline]
> RIP: 0010:folio_put_testzero include/linux/mm.h:1141 [inline]
> RIP: 0010:folio_put include/linux/mm.h:1508 [inline]
> RIP: 0010:put_page+0x1b6/0x260 include/linux/mm.h:1581
> Code: 00 00 e8 6d 25 61 fd 84 c0 74 6e e8 c4 a6 ed fc e9 3f ff ff ff e8 ba a6 ed fc 4c 89 f7 48 c7 c6 a0 12 1f 8c e8 bb ea 36 fd 90 <0f> 0b e8 a3 a6 ed fc e9 a1 fe ff ff 4c 89 f7 be 08 00 00 00 e8 11
> RSP: 0018:ffffc9000353fc30 EFLAGS: 00010246
> RAX: bf727e5c3e70b300 RBX: ffffea0000446034 RCX: 0000000000000001
> RDX: dffffc0000000000 RSI: ffffffff8bcad5c0 RDI: 0000000000000001
> RBP: 0000000000000000 R08: ffffffff8fa934ef R09: 1ffffffff1f5269d
> R10: dffffc0000000000 R11: fffffbfff1f5269e R12: 1ffff1100c8c9518
> R13: ffff888064636000 R14: ffffea0000446000 R15: ffff88806464a8c6
> FS:  00005555716a0380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fe2349d29f0 CR3: 0000000022106000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   io_pages_unmap+0x1c0/0x320 io_uring/memmap.c:108
>   io_rings_free+0xcf/0x2b0 io_uring/io_uring.c:2619
>   io_allocate_scq_urings+0x41f/0x640 io_uring/io_uring.c:3437
>   io_uring_create+0x741/0x12f0 io_uring/io_uring.c:3590
>   io_uring_setup io_uring/io_uring.c:3702 [inline]
>   __do_sys_io_uring_setup io_uring/io_uring.c:3729 [inline]
>   __se_sys_io_uring_setup+0x2ba/0x330 io_uring/io_uring.c:3723
>   do_syscall_64+0xfb/0x240
>   entry_SYSCALL_64_after_hwframe+0x72/0x7a
> RIP: 0033:0x7fe234a0f9d9
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffc53bc7168 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
> RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00007fe234a0f9d9
> RDX: 00007fe234a0f9d9 RSI: 0000000020000000 RDI: 0000000000006839
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe234a59036
> R13: 00007ffc53bc71a0 R14: 00007ffc53bc71e0 R15: 0000000000000000
>   </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:put_page_testzero include/linux/mm.h:1135 [inline]
> RIP: 0010:folio_put_testzero include/linux/mm.h:1141 [inline]
> RIP: 0010:folio_put include/linux/mm.h:1508 [inline]
> RIP: 0010:put_page+0x1b6/0x260 include/linux/mm.h:1581
> Code: 00 00 e8 6d 25 61 fd 84 c0 74 6e e8 c4 a6 ed fc e9 3f ff ff ff e8 ba a6 ed fc 4c 89 f7 48 c7 c6 a0 12 1f 8c e8 bb ea 36 fd 90 <0f> 0b e8 a3 a6 ed fc e9 a1 fe ff ff 4c 89 f7 be 08 00 00 00 e8 11
> RSP: 0018:ffffc9000353fc30 EFLAGS: 00010246
> RAX: bf727e5c3e70b300 RBX: ffffea0000446034 RCX: 0000000000000001
> RDX: dffffc0000000000 RSI: ffffffff8bcad5c0 RDI: 0000000000000001
> RBP: 0000000000000000 R08: ffffffff8fa934ef R09: 1ffffffff1f5269d
> R10: dffffc0000000000 R11: fffffbfff1f5269e R12: 1ffff1100c8c9518
> R13: ffff888064636000 R14: ffffea0000446000 R15: ffff88806464a8c6
> FS:  00005555716a0380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000556f47e67058 CR3: 0000000022106000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> 
> 
> ---
> 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 syzkaller@googlegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
> 
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
> 
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
> 
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
> 
> If you want to undo deduplication, reply with:
> #syz undup

-- 
Pavel Begunkov