rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (0 ticks this GP) idle=43b4/1/0x4000000000000000 softirq=277695/277695 fqs=2
rcu: (detected by 0, t=10502 jiffies, g=307365, q=721 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10012 Comm: syz.8.11386 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:do_raw_write_seqcount_barrier include/linux/seqlock.h:575 [inline]
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:2010 [inline]
RIP: 0010:__hrtimer_run_queues+0x26c/0xa10 kernel/time/hrtimer.c:2096
Code: 84 24 88 00 00 00 42 80 3c 28 00 74 08 4c 89 ff e8 c9 e8 80 00 49 89 2f 48 8b 14 24 49 89 d7 49 c1 ef 03 43 0f b6 04 2f 84 c0 <0f> 85 75 03 00 00 ff 02 43 0f b6 04 2f 84 c0 0f 85 88 03 00 00 48
RSP: 0018:ffffc90000a08dd8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000010000
RDX: ffff8880b8728310 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: ffff88807eefa300 R08: ffffffff9a9af23b R09: 1ffffffff3535e47
R10: dffffc0000000000 R11: fffffbfff3535e48 R12: ffff8880b87281c0
R13: dffffc0000000000 R14: ffff8880b8728360 R15: 1ffff110170e5062
FS: 00007fc3b2db86c0(0000) GS:ffff88812505a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3b2db7ff8 CR3: 00000000508c5000 CR4: 0000000000350ef0
Call Trace:
hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 cd cb d1 f5 f7 c3 00 02 00 00 74 05 e8 90 b0 fd f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 d4 e1 c2 f5 65 8b 05 ad 62 9b 07 85 c0 74 18 5b 41 5e e9 7c 43
RSP: 0018:ffffc90004a67aa8 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8e22949e RDI: 0000000000000001
RBP: ffffc90004a67bd0 R08: ffffffff90576cf7 R09: 1ffffffff20aed9e
R10: dffffc0000000000 R11: fffffbfff20aed9f R12: dffffc0000000000
R13: 0000000000000005 R14: ffffffff9a7bf9d8 R15: 1ffff9200094cf64
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:573 [inline]
__do_adjtimex+0xb2c/0xe40 kernel/time/timekeeping.c:2985
do_adjtimex+0xd1/0x370 kernel/time/timekeeping.c:2996
do_clock_adjtime kernel/time/posix-timers.c:1169 [inline]
__do_sys_clock_adjtime kernel/time/posix-timers.c:1181 [inline]
__se_sys_clock_adjtime kernel/time/posix-timers.c:1172 [inline]
__x64_sys_clock_adjtime+0x252/0x340 kernel/time/posix-timers.c:1172
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc3b1f9de59
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:00007fc3b2db8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fc3b2226090 RCX: 00007fc3b1f9de59
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007fc3b2033e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc3b2226128 R14: 00007fc3b2226090 R15: 00007fffdd024f88
rcu: rcu_preempt kthread starved for 10498 jiffies! g307365 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:26848 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 18979 Comm: kworker/u8:18 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0x10b5/0x14b0 kernel/smp.c:892
Code: 1e 89 de 83 e6 01 31 ff e8 d8 1e 0c 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 84 1a 0c 00 eb 37 f3 90 41 0f b6 04 1c <84> c0 75 10 41 f7 06 01 00 00 00 74 1e e8 69 1a 0c 00 eb e5 44 89
RSP: 0018:ffffc900034e7720 EFLAGS: 00000293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88807fcebe00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900034e7860 R08: ffffffff90576cf7 R09: 1ffffffff20aed9e
R10: dffffc0000000000 R11: fffffbfff20aed9f R12: 1ffff110170e81d1
R13: ffff8880b863c448 R14: ffff8880b8740e88 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888124f5a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a9f3ce368 CR3: 000000000e946000 CR4: 0000000000350ef0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057
on_each_cpu include/linux/smp.h:72 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2773 [inline]
smp_text_poke_batch_finish+0x5fd/0x1110 arch/x86/kernel/alternative.c:2983
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:911
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245