linux-kernel - [syzbot] [sound?] WARNING in update_rq

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Message-ID: <6933280c.a70a0220.243dc6.000f.GAE@google.com>
Date: Fri, 05 Dec 2025 10:44:28 -0800
From: syzbot <syzbot+9bcc3c097b2741b0b3d4@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org, perex@...ex.cz, 
	syzkaller-bugs@...glegroups.com, tiwai@...e.com
Subject: [syzbot] [sound?] WARNING in update_rq_clock

Hello,

syzbot found the following issue on:

HEAD commit:    3f9f0252130e Merge tag 'random-6.19-rc1-for-linus' of git:..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=139954c2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d26d579b55a35755
dashboard link: https://syzkaller.appspot.com/bug?extid=9bcc3c097b2741b0b3d4
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/31d3e2efa35c/disk-3f9f0252.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/289b98490179/vmlinux-3f9f0252.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bdf40a8f97b1/bzImage-3f9f0252.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9bcc3c097b2741b0b3d4@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: kernel/sched/sched.h:1547 at lockdep_assert_rq_held kernel/sched/sched.h:1547 [inline], CPU#0: syz.2.23/6074
WARNING: kernel/sched/sched.h:1547 at lockdep_assert_rq_held kernel/sched/sched.h:1545 [inline], CPU#0: syz.2.23/6074
WARNING: kernel/sched/sched.h:1547 at update_rq_clock+0x34a/0xc70 kernel/sched/core.c:837, CPU#0: syz.2.23/6074
Modules linked in:
CPU: 0 UID: 0 PID: 6074 Comm: syz.2.23 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1547 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1545 [inline]
RIP: 0010:update_rq_clock+0x34a/0xc70 kernel/sched/core.c:837
Code: ab 48 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 9c fd ff ff 90 0f 0b 90 e9 93 fd ff ff 90 <0f> 0b 90 e9 4f fd ff ff 48 8d bb 18 0e 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc900053179a0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853ab80 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8d87a111 RDI: ffffffff8bd1d700
RBP: 0000000000000001 R08: ffff8880b843b688 R09: fffffbfff20cc09a
R10: ffffffff906604d7 R11: 0000000000000001 R12: ffffffff90663534
R13: ffffffff8db376a0 R14: ffff88801f3f0000 R15: ffff8880b853ab80
FS:  00007f4eba4206c0(0000) GS:ffff888124ba3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000417000 CR3: 0000000023368000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 pick_next_task kernel/sched/core.c:6080 [inline]
 __schedule+0x212d/0x6150 kernel/sched/core.c:6797
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7039
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irq+0x44/0x50 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 snd_rawmidi_write+0x48c/0xc10 sound/core/rawmidi.c:1615
 vfs_write+0x2a0/0x11d0 fs/read_write.c:684
 ksys_write+0x1f8/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4eb958f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4eba420038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f4eb97e5fa0 RCX: 00007f4eb958f7c9
RDX: 000000100000e3d9 RSI: 00002000000000c0 RDI: 0000000000000002
RBP: 00007f4eb9613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4eb97e6038 R14: 00007f4eb97e5fa0 R15: 00007ffe623eab68
 </TASK>


---
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