lkml.org 
[lkml]   [2021]   [Jul]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [syzbot] kernel BUG in io_queue_async_work
Date
On 7/12/21 10:28 AM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: e2f74b13 Add linux-next specific files for 20210708
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=14fc6fb4300000
> kernel config: https://syzkaller.appspot.com/x/.config?x=59e1e3bbc3afca75
> dashboard link: https://syzkaller.appspot.com/bug?extid=d50e4f20cfad4510ec22
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+d50e4f20cfad4510ec22@syzkaller.appspotmail.com

[...]

> __io_queue_sqe+0x913/0xf10 fs/io_uring.c:6444

Shouldn't have got here from fallback, so very similar to a bug fixed
by an already sent "io_uring: use right task for exiting checks"

> io_req_task_submit+0x100/0x120 fs/io_uring.c:2020
> io_fallback_req_func+0x81/0xb0 fs/io_uring.c:2437
> process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
> worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
> kthread+0x3e5/0x4d0 kernel/kthread.c:319
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
> Modules linked in:
> ---[ end trace 4d51acadba583174 ]---
> RIP: 0010:io_queue_async_work+0x539/0x5f0 fs/io_uring.c:1293
> Code: 89 be 89 00 00 00 48 c7 c7 00 8a 9a 89 c6 05 28 5f 77 0b 01 e8 be e9 06 07 e9 6e ff ff ff e8 be 1e 95 ff 0f 0b e8 b7 1e 95 ff <0f> 0b e8 b0 1e 95 ff 0f 0b e9 1a fd ff ff e8 d4 2f db ff e9 47 fb
> RSP: 0018:ffffc900032efba8 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffff88802840c800 RCX: 0000000000000000
> RDX: ffff888082e09c80 RSI: ffffffff81e07d49 RDI: ffff8880224da498
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000043736500
> R10: ffffffff81e222ff R11: 0000000000000000 R12: ffff8880782e78c0
> R13: 0000000000000019 R14: ffff88802840c8b0 R15: ffff8880782e7918
> FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f3dee45e000 CR3: 000000002dd4e000 CR4: 00000000001506f0
> 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.
>

--
Pavel Begunkov

\
 
 \ /
  Last update: 2021-07-12 15:02    [W:0.114 / U:1.928 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site