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* [syzbot] [kernel?] upstream test error: WARNING in rcu_tasks_verify_work_fn
@ 2026-09-15  0:01 syzbot
  0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-09-15  0:01 UTC (permalink / raw)
  To: bp, dave.hansen, hpa, linux-kernel, mingo, syzkaller-bugs, tglx, x86

Hello,

syzbot found the following issue on:

HEAD commit:    08df884136f1 Merge tag 'thermal-7.3-rc3' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15d8679e580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=85bc5cc2fc7394d9
dashboard link: https://syzkaller.appspot.com/bug?extid=9d7ab3bc11055d9740f5
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/08145c70959e/disk-08df8841.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5db70c770722/vmlinux-08df8841.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ec39950e39cb/bzImage-08df8841.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9d7ab3bc11055d9740f5@syzkaller.appspotmail.com

call_rcu_tasks() has failed boot-time tests.
rcu_tasks: RTGS_WAIT_SCAN_HOLDOUTS(6) since 24 g:5 i:0 kCuUP l:25 
------------[ cut here ]------------
ret < 0
WARNING: kernel/rcu/tasks.h:1541 at rcu_tasks_verify_self_tests kernel/rcu/tasks.h:1541 [inline], CPU#1: kworker/1:2/56
WARNING: kernel/rcu/tasks.h:1541 at rcu_tasks_verify_work_fn+0x1b6/0x270 kernel/rcu/tasks.h:1553, CPU#1: kworker/1:2/56
Modules linked in:
CPU: 1 UID: 0 PID: 56 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events rcu_tasks_verify_work_fn
RIP: 0010:rcu_tasks_verify_self_tests kernel/rcu/tasks.h:1541 [inline]
RIP: 0010:rcu_tasks_verify_work_fn+0x1b6/0x270 kernel/rcu/tasks.h:1553
Code: 80 3c 10 00 0f 85 b5 00 00 00 48 8b 35 9b 91 7d 0c b9 64 00 00 00 bf 08 00 00 00 48 c7 c2 a0 8a 99 9b e8 ad 6c e2 ff eb 97 90 <0f> 0b 90 eb 91 48 89 df e8 7d 82 8f 00 e9 69 ff ff ff 48 89 df e8
RSP: 0000:ffffc9000110fbb0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8edeb8a8 RCX: 0000000000000000
RDX: 1ffffffff1dbd715 RSI: ffffffff81e97409 RDI: fffff52000221f49
RBP: 1ffff92000221f76 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000000 R11: 0000000000000001 R12: 0000000000000bb8
R13: 00000000ffffffff R14: 0000000000000001 R15: ffffffff8edeb8a8
FS:  0000000000000000(0000) GS:ffff888123c60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000eb96000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


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