[v6.6] INFO: rcu detected stall in sys_clock_adjtime
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syzbot
Nov 6, 2025, 8:05:36 PM (9 days ago) Nov 6
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 0a805b6ea8cd Linux 6.6.116
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13947812580000
kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=b935552541fffb9f881c
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/13874446b4b2/disk-0a805b6e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/69a5e59e1ade/vmlinux-0a805b6e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/322c0711f976/bzImage-0a805b6e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b93555...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 ticks this GP) idle=87cc/1/0x4000000000000000 softirq=129090/129090 fqs=0
rcu: (detected by 1, t=10502 jiffies, g=150989, q=191 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 23089 Comm: syz.7.4437 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3781 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3837 [inline]
RIP: 0010:__lock_acquire+0x1346/0x7c80 kernel/locking/lockdep.c:5137
Code: e8 03 25 f8 03 00 00 48 8d b8 00 85 da 90 be 08 00 00 00 e8 8c db 75 00 49 b8 00 00 00 00 00 fc ff df 48 0f a3 1d da 73 73 0f <72> 25 48 c7 c0 80 f4 ea 96 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85
RSP: 0018:ffffc90000007880 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81671114
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90da8500
RBP: ffffc90000007ac8 R08: dffffc0000000000 R09: 1ffffffff21b50a0
R10: dffffc0000000000 R11: fffffbfff21b50a1 R12: 2f566e4e45871fd7
R13: ffff888045228000 R14: 0000000045871fd7 R15: ffff888045228b50
FS: 00007fb6ff5ba6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f496db156c0 CR3: 0000000044d56000 CR4: 00000000003506f0
Call Trace:
<IRQ>
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x67/0x350 lib/debugobjects.c:764
debug_hrtimer_deactivate kernel/time/hrtimer.c:455 [inline]
debug_deactivate+0x1d/0x1d0 kernel/time/hrtimer.c:511
__run_hrtimer kernel/time/hrtimer.c:1718 [inline]
__hrtimer_run_queues+0x2bf/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa9/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 ea 7c 13 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f2 f8 e2 f6 65 8b 05 e3 41 8b 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000ecff8a0 EFLAGS: 00000206
RAX: be9b9e35439b6100 RBX: 0000000000000a06 RCX: be9b9e35439b6100
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001
RBP: ffffc9000ecff938 R08: ffffffff8e4a8d6f R09: 1ffffffff1c951ad
R10: dffffc0000000000 R11: fffffbfff1c951ae R12: dffffc0000000000
R13: 3642f7e44704f151 R14: ffff888069603488 R15: 1ffff92001d9ff14
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
timerfd_clock_was_set+0x1ce/0x2c0 fs/timerfd.c:113
clock_was_set+0x74e/0x7d0 kernel/time/hrtimer.c:1003
timekeeping_inject_offset+0x57c/0x620 kernel/time/timekeeping.c:1395
do_adjtimex+0x435/0x9c0 kernel/time/timekeeping.c:2444
do_clock_adjtime kernel/time/posix-timers.c:1160 [inline]
__do_sys_clock_adjtime kernel/time/posix-timers.c:1172 [inline]
__se_sys_clock_adjtime kernel/time/posix-timers.c:1163 [inline]
__x64_sys_clock_adjtime+0x1f4/0x2a0 kernel/time/posix-timers.c:1163
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb6fe78f6c9
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:00007fb6ff5ba038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fb6fe9e6090 RCX: 00007fb6fe78f6c9
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007fb6fe811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb6fe9e6128 R14: 00007fb6fe9e6090 R15: 00007ffddf7f6b48
</TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g150989 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=102586
rcu: rcu_preempt kthread starved for 10502 jiffies! g150989 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:I stack:27088 pid:17 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 23089 Comm: syz.7.4437 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:debug_spin_lock_after kernel/locking/spinlock_debug.c:-1 [inline]
RIP: 0010:do_raw_spin_lock+0x13b/0x2c0 kernel/locking/spinlock_debug.c:117
Code: 00 48 8d 7c 24 40 be 04 00 00 00 e8 5f a3 74 00 8b 44 24 40 b9 01 00 00 00 f0 0f b1 0b 0f 85 d9 00 00 00 65 8b 1d 51 6e 9b 7e <48> b9 00 00 00 00 00 fc ff df 41 0f b6 04 0f 49 89 cf 84 c0 0f 85
RSP: 0018:ffffc90000007b60 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007ba0
RBP: ffffc90000007c10 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f74 R12: ffffffff970ed9b8
R13: ffffffff970ed9b0 R14: 1ffffffff2e1db37 R15: 1ffffffff2e1db36
FS: 00007fb6ff5ba6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f496db156c0 CR3: 0000000044d56000 CR4: 00000000003506f0
Call Trace:
<IRQ>
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xb4/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x67/0x350 lib/debugobjects.c:764
debug_hrtimer_deactivate kernel/time/hrtimer.c:455 [inline]
debug_deactivate+0x1d/0x1d0 kernel/time/hrtimer.c:511
__run_hrtimer kernel/time/hrtimer.c:1718 [inline]
__hrtimer_run_queues+0x2bf/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa9/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 ea 7c 13 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f2 f8 e2 f6 65 8b 05 e3 41 8b 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000ecff8a0 EFLAGS: 00000206
RAX: be9b9e35439b6100 RBX: 0000000000000a06 RCX: be9b9e35439b6100
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001
RBP: ffffc9000ecff938 R08: ffffffff8e4a8d6f R09: 1ffffffff1c951ad
R10: dffffc0000000000 R11: fffffbfff1c951ae R12: dffffc0000000000
R13: 3642f7e44704f151 R14: ffff888069603488 R15: 1ffff92001d9ff14
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
timerfd_clock_was_set+0x1ce/0x2c0 fs/timerfd.c:113
clock_was_set+0x74e/0x7d0 kernel/time/hrtimer.c:1003
timekeeping_inject_offset+0x57c/0x620 kernel/time/timekeeping.c:1395
do_adjtimex+0x435/0x9c0 kernel/time/timekeeping.c:2444
do_clock_adjtime kernel/time/posix-timers.c:1160 [inline]
__do_sys_clock_adjtime kernel/time/posix-timers.c:1172 [inline]
__se_sys_clock_adjtime kernel/time/posix-timers.c:1163 [inline]
__x64_sys_clock_adjtime+0x1f4/0x2a0 kernel/time/posix-timers.c:1163
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb6fe78f6c9
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:00007fb6ff5ba038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fb6fe9e6090 RCX: 00007fb6fe78f6c9
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007fb6fe811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb6fe9e6128 R14: 00007fb6fe9e6090 R15: 00007ffddf7f6b48
</TASK>
---
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syzbot found the following issue on:
HEAD commit: 0a805b6ea8cd Linux 6.6.116
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13947812580000
kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=b935552541fffb9f881c
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/13874446b4b2/disk-0a805b6e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/69a5e59e1ade/vmlinux-0a805b6e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/322c0711f976/bzImage-0a805b6e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b93555...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 ticks this GP) idle=87cc/1/0x4000000000000000 softirq=129090/129090 fqs=0
rcu: (detected by 1, t=10502 jiffies, g=150989, q=191 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 23089 Comm: syz.7.4437 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3781 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3837 [inline]
RIP: 0010:__lock_acquire+0x1346/0x7c80 kernel/locking/lockdep.c:5137
Code: e8 03 25 f8 03 00 00 48 8d b8 00 85 da 90 be 08 00 00 00 e8 8c db 75 00 49 b8 00 00 00 00 00 fc ff df 48 0f a3 1d da 73 73 0f <72> 25 48 c7 c0 80 f4 ea 96 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85
RSP: 0018:ffffc90000007880 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81671114
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90da8500
RBP: ffffc90000007ac8 R08: dffffc0000000000 R09: 1ffffffff21b50a0
R10: dffffc0000000000 R11: fffffbfff21b50a1 R12: 2f566e4e45871fd7
R13: ffff888045228000 R14: 0000000045871fd7 R15: ffff888045228b50
FS: 00007fb6ff5ba6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f496db156c0 CR3: 0000000044d56000 CR4: 00000000003506f0
Call Trace:
<IRQ>
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x67/0x350 lib/debugobjects.c:764
debug_hrtimer_deactivate kernel/time/hrtimer.c:455 [inline]
debug_deactivate+0x1d/0x1d0 kernel/time/hrtimer.c:511
__run_hrtimer kernel/time/hrtimer.c:1718 [inline]
__hrtimer_run_queues+0x2bf/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa9/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 ea 7c 13 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f2 f8 e2 f6 65 8b 05 e3 41 8b 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000ecff8a0 EFLAGS: 00000206
RAX: be9b9e35439b6100 RBX: 0000000000000a06 RCX: be9b9e35439b6100
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001
RBP: ffffc9000ecff938 R08: ffffffff8e4a8d6f R09: 1ffffffff1c951ad
R10: dffffc0000000000 R11: fffffbfff1c951ae R12: dffffc0000000000
R13: 3642f7e44704f151 R14: ffff888069603488 R15: 1ffff92001d9ff14
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
timerfd_clock_was_set+0x1ce/0x2c0 fs/timerfd.c:113
clock_was_set+0x74e/0x7d0 kernel/time/hrtimer.c:1003
timekeeping_inject_offset+0x57c/0x620 kernel/time/timekeeping.c:1395
do_adjtimex+0x435/0x9c0 kernel/time/timekeeping.c:2444
do_clock_adjtime kernel/time/posix-timers.c:1160 [inline]
__do_sys_clock_adjtime kernel/time/posix-timers.c:1172 [inline]
__se_sys_clock_adjtime kernel/time/posix-timers.c:1163 [inline]
__x64_sys_clock_adjtime+0x1f4/0x2a0 kernel/time/posix-timers.c:1163
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb6fe78f6c9
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:00007fb6ff5ba038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fb6fe9e6090 RCX: 00007fb6fe78f6c9
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007fb6fe811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb6fe9e6128 R14: 00007fb6fe9e6090 R15: 00007ffddf7f6b48
</TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g150989 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=102586
rcu: rcu_preempt kthread starved for 10502 jiffies! g150989 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:I stack:27088 pid:17 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 23089 Comm: syz.7.4437 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:debug_spin_lock_after kernel/locking/spinlock_debug.c:-1 [inline]
RIP: 0010:do_raw_spin_lock+0x13b/0x2c0 kernel/locking/spinlock_debug.c:117
Code: 00 48 8d 7c 24 40 be 04 00 00 00 e8 5f a3 74 00 8b 44 24 40 b9 01 00 00 00 f0 0f b1 0b 0f 85 d9 00 00 00 65 8b 1d 51 6e 9b 7e <48> b9 00 00 00 00 00 fc ff df 41 0f b6 04 0f 49 89 cf 84 c0 0f 85
RSP: 0018:ffffc90000007b60 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007ba0
RBP: ffffc90000007c10 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f74 R12: ffffffff970ed9b8
R13: ffffffff970ed9b0 R14: 1ffffffff2e1db37 R15: 1ffffffff2e1db36
FS: 00007fb6ff5ba6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f496db156c0 CR3: 0000000044d56000 CR4: 00000000003506f0
Call Trace:
<IRQ>
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xb4/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x67/0x350 lib/debugobjects.c:764
debug_hrtimer_deactivate kernel/time/hrtimer.c:455 [inline]
debug_deactivate+0x1d/0x1d0 kernel/time/hrtimer.c:511
__run_hrtimer kernel/time/hrtimer.c:1718 [inline]
__hrtimer_run_queues+0x2bf/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa9/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 ea 7c 13 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f2 f8 e2 f6 65 8b 05 e3 41 8b 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000ecff8a0 EFLAGS: 00000206
RAX: be9b9e35439b6100 RBX: 0000000000000a06 RCX: be9b9e35439b6100
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001
RBP: ffffc9000ecff938 R08: ffffffff8e4a8d6f R09: 1ffffffff1c951ad
R10: dffffc0000000000 R11: fffffbfff1c951ae R12: dffffc0000000000
R13: 3642f7e44704f151 R14: ffff888069603488 R15: 1ffff92001d9ff14
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
timerfd_clock_was_set+0x1ce/0x2c0 fs/timerfd.c:113
clock_was_set+0x74e/0x7d0 kernel/time/hrtimer.c:1003
timekeeping_inject_offset+0x57c/0x620 kernel/time/timekeeping.c:1395
do_adjtimex+0x435/0x9c0 kernel/time/timekeeping.c:2444
do_clock_adjtime kernel/time/posix-timers.c:1160 [inline]
__do_sys_clock_adjtime kernel/time/posix-timers.c:1172 [inline]
__se_sys_clock_adjtime kernel/time/posix-timers.c:1163 [inline]
__x64_sys_clock_adjtime+0x1f4/0x2a0 kernel/time/posix-timers.c:1163
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb6fe78f6c9
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:00007fb6ff5ba038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fb6fe9e6090 RCX: 00007fb6fe78f6c9
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007fb6fe811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb6fe9e6128 R14: 00007fb6fe9e6090 R15: 00007ffddf7f6b48
</TASK>
---
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