Re: [syzbot] [kernel?] WARNING in update_rq_clock (2)

[Thomas Gleixner <tglx@kernel.org>]

On Thu, Jul 02 2026 at 17:38, syzbot wrote:

CC+: Peter

Dear syzbot folks. The selection of people you CC on your reports is
annoyingly random. The splat clearly says:

> WARNING: kernel/sched/sched.h:1641 at lockdep_assert_rq_held kernel/sched/sched.h:1641 [inline], CPU#0: syz.4.1183/11558

So why not picking that up and:

# scripts/get_maintainer.pl -f kernel/sched/sched.h 

Ingo Molnar <mingo@redhat.com> (maintainer:SCHEDULER)
Peter Zijlstra <peterz@infradead.org> (maintainer:SCHEDULER)
Juri Lelli <juri.lelli@redhat.com> (maintainer:SCHEDULER)
Vincent Guittot <vincent.guittot@linaro.org> (maintainer:SCHEDULER)
Dietmar Eggemann <dietmar.eggemann@arm.com> (reviewer:SCHEDULER)
Steven Rostedt <rostedt@goodmis.org> (reviewer:SCHEDULER)
Ben Segall <bsegall@google.com> (reviewer:SCHEDULER)
Mel Gorman <mgorman@suse.de> (reviewer:SCHEDULER)
Valentin Schneider <vschneid@redhat.com> (reviewer:SCHEDULER)
K Prateek Nayak <kprateek.nayak@amd.com> (reviewer:SCHEDULER)
linux-kernel@vger.kernel.org (open list:SCHEDULER)


?

Leaving the report untrimmed for Peter.

> syzbot found the following issue on:
>
> HEAD commit:    8b69c0475871 Merge tag 'input-for-v7.2-rc0-2' of git://git..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1196f4ea580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=eb3cf873145f98c4
> dashboard link: https://syzkaller.appspot.com/bug?extid=681e729b2cf0d4860042
> compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/6fbba2b94559/disk-8b69c047.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/377e82061e2d/vmlinux-8b69c047.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/f299b46fb771/bzImage-8b69c047.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+681e729b2cf0d4860042@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> debug_locks && !(lock_is_held(&(__rq_lockp(rq))->dep_map) != 0)
> WARNING: kernel/sched/sched.h:1641 at lockdep_assert_rq_held kernel/sched/sched.h:1641 [inline], CPU#0: syz.4.1183/11558
> WARNING: kernel/sched/sched.h:1641 at lockdep_assert_rq_held kernel/sched/sched.h:1638 [inline], CPU#0: syz.4.1183/11558
> WARNING: kernel/sched/sched.h:1641 at update_rq_clock+0x40a/0xd20 kernel/sched/core.c:865, CPU#0: syz.4.1183/11558
> Modules linked in:
> CPU: 0 UID: 0 PID: 11558 Comm: syz.4.1183 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
> Tainted: [U]=USER, [L]=SOFTLOCKUP
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
> RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1641 [inline]
> RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1638 [inline]
> RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:865
> Code: ab c8 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 d8 7e c8 09 a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 c0 0b 00 00 48 b8 00 00 00 00 00
> RSP: 0018:ffffc90003cb70b8 EFLAGS: 00010046
> RAX: 0000000000000000 RBX: ffff8880b853b600 RCX: 0000000000000001
> RDX: 0000000000000046 RSI: ffffffff8df333b0 RDI: ffffffff8c1e8f80
> RBP: ffffc90003cb7260 R08: 0000000000000001 R09: 0000000000000001
> R10: ffffffff90dbdb97 R11: 0000000000000000 R12: ffffffff90dc0f44
> R13: ffff8880b853c4e0 R14: ffff88801e6a1f00 R15: ffff8880b843c198
> FS:  00007fece89b36c0(0000) GS:ffff8881242e7000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 00000000775a2000 CR4: 00000000003526f0
> Call Trace:
>  <TASK>
>  pick_next_task kernel/sched/core.c:6338 [inline]
>  __schedule+0x1e2d/0x6730 kernel/sched/core.c:7149
>  preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7413
>  preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
>  __local_bh_enable_ip+0xff/0x120 kernel/softirq.c:457
>  local_bh_enable include/linux/bottom_half.h:33 [inline]
>  fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline]
>  kernel_fpu_end arch/x86/kernel/fpu/core.c:506 [inline]
>  kernel_fpu_end+0x64/0x80 arch/x86/kernel/fpu/core.c:499
>  sha256_blocks_avx2+0x4e/0x90 lib/crypto/x86/sha256.h:31
>  sha256_blocks lib/crypto/x86/sha256.h:58 [inline]
>  __sha256_update+0x188/0x1c0 lib/crypto/sha256.c:208
>  crypto_sha256_update+0x23/0x30 crypto/sha256.c:142
>  crypto_shash_finup+0x34b/0x6b0 crypto/shash.c:123
>  crypto_shash_update include/crypto/hash.h:998 [inline]
>  ima_calc_file_hash_tfm+0x299/0x350 security/integrity/ima/ima_crypto.c:233
>  ima_calc_file_hash+0x1e3/0x380 security/integrity/ima/ima_crypto.c:280
>  ima_collect_measurement+0x94f/0xb30 security/integrity/ima/ima_api.c:300
>  process_measurement+0xdfe/0x2350 security/integrity/ima/ima_main.c:425
>  ima_file_mmap+0x1c4/0x1f0 security/integrity/ima/ima_main.c:523
>  security_mmap_file+0x278/0x9b0 security/security.c:2581
>  vm_mmap_pgoff+0xec/0x470 mm/util.c:575
>  ksys_mmap_pgoff+0x285/0x610 mm/mmap.c:606
>  __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
>  __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
>  __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fece7b9ce59
> Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007fece89b3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
> RAX: ffffffffffffffda RBX: 00007fece7e16090 RCX: 00007fece7b9ce59
> RDX: 00004000000000df RSI: 200000000000000b RDI: 0000000000000000
> RBP: 00007fece7c32e6f R08: 0000000000000401 R09: 0000300000000000
> R10: 0000000000040eb1 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007fece7e16128 R14: 00007fece7e16090 R15: 00007ffd39c61db8
>  </TASK>
>
>
> ---
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