WARNING in io_disable_sqo_submit

From: syzbot <syzbot+2f5d1785dc624932da78@syzkaller.appspotmail.com>
To: axboe@kernel.dk, io-uring@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: WARNING in io_disable_sqo_submit
Date: Fri, 15 Jan 2021 15:08:23 -0800	[thread overview]
Message-ID: <000000000000f054d005b8f87274@google.com> (raw)

Hello,

syzbot found the following issue on:

HEAD commit:    7c53f6b6 Linux 5.11-rc3
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12a76f70d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c60c9ff9cc916cbc
dashboard link: https://syzkaller.appspot.com/bug?extid=2f5d1785dc624932da78
compiler:       gcc (GCC) 10.1.0-syz 20200507

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+2f5d1785dc624932da78@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 9094 at fs/io_uring.c:8884 io_disable_sqo_submit+0x106/0x130 fs/io_uring.c:8884
Modules linked in:
CPU: 1 PID: 9094 Comm: syz-executor.5 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_disable_sqo_submit+0x106/0x130 fs/io_uring.c:8884
Code: b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1d 83 8b 14 01 00 00 01 48 89 ef 5b 5d e9 ef bc 23 07 e8 5a e5 9a ff <0f> 0b e9 35 ff ff ff e8 3e a1 dd ff eb dc e8 67 a1 dd ff e9 65 ff
RSP: 0018:ffffc9000188fea0 EFLAGS: 00010212
RAX: 0000000000000044 RBX: ffff888079dbe000 RCX: ffffc90013b54000
RDX: 0000000000040000 RSI: ffffffff81d7e466 RDI: ffff888079dbe0d0
RBP: ffff8880201c0c80 R08: 0000000000000000 R09: 00000000278d0001
R10: ffffffff81d7e705 R11: 0000000000000001 R12: ffff888079dbe000
R13: ffff8880278d0001 R14: ffff888079dbe040 R15: ffff888079dbe0d0
FS:  00007fe461a71700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 0000000011fd1000 CR4: 0000000000350ee0
Call Trace:
 io_uring_flush+0x28b/0x3a0 fs/io_uring.c:9099
 filp_close+0xb4/0x170 fs/open.c:1280
 close_fd+0x5c/0x80 fs/file.c:626
 __do_sys_close fs/open.c:1299 [inline]
 __se_sys_close fs/open.c:1297 [inline]
 __x64_sys_close+0x2f/0xa0 fs/open.c:1297
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe461a70c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 000000000119bfb0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffc626b58ff R14: 00007fe461a719c0 R15: 000000000119bf8c

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