linux-kernel - WARNING in create_io

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Message-ID: <00000000000003a2e105b581f7b9@google.com>
Date:   Wed, 02 Dec 2020 13:31:23 -0800
From:   syzbot <syzbot+fa13b30255540662f825@...kaller.appspotmail.com>
To:     axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: WARNING in create_io_worker

Hello,

syzbot found the following issue on:

HEAD commit:    c84e1efa Merge tag 'asm-generic-fixes-5.10-2' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14a43395500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6d1e98d0b97781e4
dashboard link: https://syzkaller.appspot.com/bug?extid=fa13b30255540662f825
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+fa13b30255540662f825@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 3 PID: 10595 at include/linux/cpumask.h:137 rcu_read_unlock include/linux/rcupdate.h:696 [inline]
WARNING: CPU: 3 PID: 10595 at include/linux/cpumask.h:137 ttwu_stat kernel/sched/core.c:2441 [inline]
WARNING: CPU: 3 PID: 10595 at include/linux/cpumask.h:137 try_to_wake_up+0xef6/0x1330 kernel/sched/core.c:2984
Modules linked in:
CPU: 3 PID: 10595 Comm: io_wq_manager Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:tryqemu-system-x86_64: warning: guest updated active QH
Code: 80 3d 93 2a 8c 0b 00 0f 84 f1 00 00 00 e8 82 80 10 00 48 c7 c6 d9 6d 4c 81 48 c7 c7 e0 77 33 8b e8 0f b7 09 00 e9 15 f9 ff ff <0f> 0b e9 65 f4 ff ff 4c 89 ff 48 89 4c 24 08 e8 b6 51 ff ff 48 8b
RSP: 0018:ffffc90004b4fd50 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 1ffff92000969faf RCX: ffff88806dc24778
RDX: 1ffff1100db848ee RSI: ffffffff83b63fcb RDI: 0000000000000006
RBP: ffff88806dc24400 R08: ffff88806dc24410 R09: ffffffff8cecc98f
R10: 0000000000000040 R11: 0000000000000000 R12: 0000000000000202
R13: ffff88806dc24c38 R14: 0000000000000008 R15: ffff88806dc24770
FS:  0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000339da98 CR3: 0000000020a7e000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 create_io_worker+0x590/0x8d0 fs/io-wq.c:720
 io_wq_manager+0x16b/0xb80 fs/io-wq.c:785
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296


---
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