Hi,
Syzkaller hits a new bug in branch 6.10.0-rc1-00004-gff802a9f35cf-dirty #7.
Note: this is also not a reliable repro, might need to try more times
```
[ 153.857557][T21250] apt-get (21250) used greatest stack depth:
22240 bytes left
[ 249.711259][T57846] ------------[ cut here ]------------
[ 249.711626][T57846] WARNING: CPU: 1 PID: 57846 at
io_uring/refs.h:38 io_issue_sqe+0x10dc/0x1720
[ 249.712188][T57846] Modules linked in:
[ 249.712431][T57846] CPU: 1 PID: 57846 Comm: iou-wrk-57845 Not
tainted 6.10.0-rc1-00004-gff802a9f35cf-dirty #7
[ 249.713020][T57846] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS 1.15.0-1 04/01/2014
[ 249.713566][T57846] RIP: 0010:io_issue_sqe+0x10dc/0x1720
[ 249.713894][T57846] Code: fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00
0f 85 c6 05 00 00 49 89 1c 24 49f
[ 249.715023][T57846] RSP: 0018:ffffc9000e84fc00 EFLAGS: 00010293
[ 249.715389][T57846] RAX: 0000000000000000 RBX: 0000000000000000
RCX: ffffffff84139c3c
[ 249.715855][T57846] RDX: ffff88801eaad640 RSI: ffffffff8413a70b
RDI: 0000000000000007
[ 249.716300][T57846] RBP: ffffc9000e84fc80 R08: 0000000000000007
R09: 0000000000000000
[ 249.716676][T57846] R10: 0000000000000000 R11: 0000000000000000
R12: ffff8880001c3a00
[ 249.717042][T57846] R13: 0000000000000000 R14: ffff888010600040
R15: ffff8880001c3a48
[ 249.717428][T57846] FS: 00007f58ce931800(0000)
GS:ffff88807ec00000(0000) knlGS:0000000000000000
[ 249.717837][T57846] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 249.718135][T57846] CR2: 00007f58ce932128 CR3: 000000001b08a000
CR4: 00000000000006f0
[ 249.718497][T57846] Call Trace:
[ 249.718668][T57846]
[ 249.718810][T57846] ? __warn+0xc7/0x2f0
[ 249.719003][T57846] ? io_issue_sqe+0x10dc/0x1720
[ 249.719233][T57846] ? report_bug+0x347/0x410
[ 249.719451][T57846] ? handle_bug+0x3d/0x80
[ 249.719654][T57846] ? exc_invalid_op+0x18/0x50
[ 249.719872][T57846] ? asm_exc_invalid_op+0x1a/0x20
[ 249.720127][T57846] ? io_issue_sqe+0x60c/0x1720
[ 249.720420][T57846] ? io_issue_sqe+0x10db/0x1720
[ 249.720711][T57846] ? io_issue_sqe+0x10dc/0x1720
[ 249.721012][T57846] ? __fget_files+0x1bc/0x3d0
[ 249.722194][T57846] ? io_wq_submit_work+0x264/0xcb0
[ 249.722521][T57846] io_wq_submit_work+0x264/0xcb0
[ 249.722826][T57846] io_worker_handle_work+0x97e/0x1790
[ 249.723159][T57846] io_wq_worker+0x38e/0xe50
[ 249.723435][T57846] ? __pfx_io_wq_worker+0x10/0x10
[ 249.723687][T57846] ? ret_from_fork+0x16/0x70
[ 249.723907][T57846] ? __pfx_lock_release+0x10/0x10
[ 249.724139][T57846] ? do_raw_spin_lock+0x12c/0x2b0
[ 249.724392][T57846] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 249.724706][T57846] ? __pfx_io_wq_worker+0x10/0x10
[ 249.725015][T57846] ret_from_fork+0x2f/0x70
[ 249.725300][T57846] ? __pfx_io_wq_worker+0x10/0x10
[ 249.725603][T57846] ret_from_fork_asm+0x1a/0x30
[ 249.725897][T57846]
[ 249.726083][T57846] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 249.726521][T57846] CPU: 1 PID: 57846 Comm: iou-wrk-57845 Not
tainted 6.10.0-rc1-00004-gff802a9f35cf-dirty #7
[ 249.727110][T57846] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS 1.15.0-1 04/01/2014
[ 249.727647][T57846] Call Trace:
[ 249.727842][T57846]
[ 249.728018][T57846] panic+0x4fa/0x5a0
[ 249.728252][T57846] ? __pfx_panic+0x10/0x10
[ 249.728516][T57846] ? show_trace_log_lvl+0x284/0x390
[ 249.728832][T57846] ? io_issue_sqe+0x10dc/0x1720
[ 249.729120][T57846] check_panic_on_warn+0x61/0x80
[ 249.729416][T57846] __warn+0xd3/0x2f0
[ 249.729650][T57846] ? io_issue_sqe+0x10dc/0x1720
[ 249.729941][T57846] report_bug+0x347/0x410
[ 249.730206][T57846] handle_bug+0x3d/0x80
[ 249.730460][T57846] exc_invalid_op+0x18/0x50
[ 249.730730][T57846] asm_exc_invalid_op+0x1a/0x20
[ 249.731031][T57846] RIP: 0010:io_issue_sqe+0x10dc/0x1720
[ 249.731365][T57846] Code: fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00
0f 85 c6 05 00 00 49 89 1c 24 49f
[ 249.732508][T57846] RSP: 0018:ffffc9000e84fc00 EFLAGS: 00010293
[ 249.732873][T57846] RAX: 0000000000000000 RBX: 0000000000000000
RCX: ffffffff84139c3c
[ 249.733351][T57846] RDX: ffff88801eaad640 RSI: ffffffff8413a70b
RDI: 0000000000000007
[ 249.733822][T57846] RBP: ffffc9000e84fc80 R08: 0000000000000007
R09: 0000000000000000
[ 249.734285][T57846] R10: 0000000000000000 R11: 0000000000000000
R12: ffff8880001c3a00
[ 249.734757][T57846] R13: 0000000000000000 R14: ffff888010600040
R15: ffff8880001c3a48
[ 249.735236][T57846] ? io_issue_sqe+0x60c/0x1720
[ 249.735529][T57846] ? io_issue_sqe+0x10db/0x1720
[ 249.735825][T57846] ? __fget_files+0x1bc/0x3d0
[ 249.736116][T57846] ? io_wq_submit_work+0x264/0xcb0
[ 249.736428][T57846] io_wq_submit_work+0x264/0xcb0
[ 249.736731][T57846] io_worker_handle_work+0x97e/0x1790
[ 249.737061][T57846] io_wq_worker+0x38e/0xe50
[ 249.737353][T57846] ? __pfx_io_wq_worker+0x10/0x10
[ 249.737646][T57846] ? ret_from_fork+0x16/0x70
[ 249.737861][T57846] ? __pfx_lock_release+0x10/0x10
[ 249.738091][T57846] ? do_raw_spin_lock+0x12c/0x2b0
[ 249.738398][T57846] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 249.738729][T57846] ? __pfx_io_wq_worker+0x10/0x10
[ 249.739033][T57846] ret_from_fork+0x2f/0x70
[ 249.739308][T57846] ? __pfx_io_wq_worker+0x10/0x10
[ 249.739617][T57846] ret_from_fork_asm+0x1a/0x30
[ 249.739913][T57846]
[ 249.740236][T57846] Kernel Offset: disabled
[ 249.740518][T57846] Rebooting in 86400 seconds..
```
crepro is in attachments.
Regards