[syzbot] [io-uring?] BUG: corrupted list in io_poll_remove_entries

[syzbot <syzbot+ab12f0c08dd7ab8d057c@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    e7aa57247700 Merge tag 'spi-fix-v6.19-rc8' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14d3b65a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f1fac0919970b671
dashboard link: https://syzkaller.appspot.com/bug?extid=ab12f0c08dd7ab8d057c
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1222965a580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140e833a580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c46beb4ff3a5/disk-e7aa5724.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d162bcaaf9b9/vmlinux-e7aa5724.xz
kernel image: https://storage.googleapis.com/syzbot-assets/54b0844b8ea7/bzImage-e7aa5724.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ab12f0c08dd7ab8d057c@syzkaller.appspotmail.com

list_del corruption. prev->next should be ffff88807dc6c3f0, but was ffff888146b205c8. (prev=ffff888146b205c8)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:62!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5969 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:__list_del_entry_valid_or_report+0x14a/0x1d0 lib/list_debug.c:62
Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 8b 55 00 48 89 e9 48 89 de 48 c7 c7 40 3d fa 8b e8 37 b0 32 fc 90 <0f> 0b 4c 89 e7 e8 3c 24 5d fd 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90003bffaa8 EFLAGS: 00010082
RAX: 000000000000006d RBX: ffff88807dc6c3f0 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81e5d6c9 RDI: fffff5200077ff46
RBP: ffff888146b205c8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000000 R12: ffff88807dc6c2b0
R13: ffff88807dc6c408 R14: ffff88807dc6c3f0 R15: ffff88807dc6c3c8
FS:  0000000000000000(0000) GS:ffff8881245d9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f60e56708c0 CR3: 000000006b065000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del_init include/linux/list.h:295 [inline]
 io_poll_remove_waitq io_uring/poll.c:149 [inline]
 io_poll_remove_entry io_uring/poll.c:166 [inline]
 io_poll_remove_entries.part.0+0x156/0x7e0 io_uring/poll.c:197
 io_poll_remove_entries io_uring/poll.c:177 [inline]
 io_poll_task_func+0x39e/0xe30 io_uring/poll.c:343
 io_handle_tw_list+0x194/0x580 io_uring/io_uring.c:1122
 tctx_task_work_run+0x57/0x2b0 io_uring/io_uring.c:1182
 tctx_task_work+0x7a/0xd0 io_uring/io_uring.c:1200
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x829/0x2a30 kernel/exit.c:971
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121
 x64_sys_call+0x14fd/0x1510 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f60e579aeb9
Code: Unable to access opcode bytes at 0x7f60e579ae8f.
RSP: 002b:00007ffc2d47ddf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f60e579aeb9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000000 R09: 00007f60e59e1280
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f60e59e1280 R14: 0000000000000003 R15: 00007ffc2d47deb0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x14a/0x1d0 lib/list_debug.c:62
Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 8b 55 00 48 89 e9 48 89 de 48 c7 c7 40 3d fa 8b e8 37 b0 32 fc 90 <0f> 0b 4c 89 e7 e8 3c 24 5d fd 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90003bffaa8 EFLAGS: 00010082
RAX: 000000000000006d RBX: ffff88807dc6c3f0 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81e5d6c9 RDI: fffff5200077ff46
RBP: ffff888146b205c8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000000 R12: ffff88807dc6c2b0
R13: ffff88807dc6c408 R14: ffff88807dc6c3f0 R15: ffff88807dc6c3c8
FS:  0000000000000000(0000) GS:ffff8881245d9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f60e56708c0 CR3: 000000006b065000 CR4: 00000000003526f0


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