rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11084/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=53109, q=133 ncpus=2)
task:syz.1.1751 state:R running task stack:27256 pid:11084 tgid:11079 ppid:5605 task_flags:0x40054c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7228
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7552
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x167b/0x2090 arch/x86/kernel/unwind_orc.c:694
Code: 00 0f 84 42 f9 ff ff 4c 89 e7 e8 60 5e c2 00 e9 35 f9 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 14 24 48 c1 ea 03 80 3c 02 00 <0f> 85 29 06 00 00 49 8d 7d 08 49 8b 5d 38 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900036ef248 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff918a7526
RDX: 1ffff920006dde5e RSI: ffffc900036ef620 RDI: ffffc900036ef2f8
RBP: 0000000000002800 R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 00000000000179c6 R12: ffffc900036ef308
R13: ffffc900036ef2b8 R14: ffffc900036ef640 R15: ffffc900036ef2ec
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x2e5/0x6c0 mm/slub.c:5515
_kmalloc_noprof include/linux/slab.h:969 [inline]
slab_free_hook mm/slub.c:2657 [inline]
slab_free mm/slub.c:6405 [inline]
kmem_cache_free+0x412/0x6b0 mm/slub.c:6532
anon_vma_free mm/rmap.c:137 [inline]
__put_anon_vma+0x114/0x3a0 mm/rmap.c:2917
put_anon_vma mm/internal.h:215 [inline]
unlink_anon_vmas+0x5f3/0x8e0 mm/rmap.c:536
free_pgtables+0x2e7/0xd80 mm/memory.c:414
exit_mmap+0x44c/0xa00 mm/mmap.c:1312
__mmput+0x12a/0x410 kernel/fork.c:1182
mmput+0x67/0x80 kernel/fork.c:1205
exit_mm kernel/exit.c:610 [inline]
do_exit+0x8b1/0x2ae0 kernel/exit.c:992
do_group_exit+0xd5/0x2a0 kernel/exit.c:1147
get_signal+0x1ec7/0x21e0 kernel/signal.c:3038
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c0179ce59
RSP: 002b:00007f6bff9cd0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f6c01a16098 RCX: 00007f6c0179ce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6c01a16098
RBP: 00007f6c01a16090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c01a16128 R14: 00007ffcb8653a30 R15: 00007ffcb8653b18
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g53109 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=19770
rcu: rcu_preempt kthread starved for 10502 jiffies! g53109 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:28984 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7322
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11100 Comm: syz.3.1759 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:debug_objects_fill_pool+0x45/0x5a0 lib/debugobjects.c:759
Code: 24 10 b3 8a b5 41 48 8d 5c 24 10 48 c7 44 24 18 7f b3 f8 8d 48 c1 eb 03 48 c7 44 24 20 40 38 0a 85 48 01 d8 c7 00 f1 f1 f1 f1 40 04 00 f3 f3 f3 65 48 8b 05 74 07 09 0f 48 89 44 24 68 31 c0
RSP: 0018:ffffc90000007cc8 EFLAGS: 00000082
RAX: fffff52000000f9b RBX: 1ffff92000000f9b RCX: ffffffff81f5009b
RDX: ffff88802df60000 RSI: ffffffff8bb2f980 RDI: ffff888029ae7300
RBP: ffffc90000007e58 R08: 0000000000000005 R09: ffffc90000007d90
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888029ae7300 R14: 0000000000000001 R15: 1ffff92000000fb2
FS: 00007fe432ff66c0(0000) GS:ffff8881242ec000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 000000007857d000 CR4: 00000000003526f0
Call Trace:
debug_object_activate+0x103/0x4b0 lib/debugobjects.c:869
debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline]
debug_activate kernel/time/hrtimer.c:528 [inline]
enqueue_hrtimer+0x75/0x2f0 kernel/time/hrtimer.c:1109
__run_hrtimer kernel/time/hrtimer.c:2048 [inline]
__hrtimer_run_queues+0x6ed/0x9c0 kernel/time/hrtimer.c:2096
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x9e/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+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 96 ed 46 f6 48 89 df e8 1e 3d 47 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 a5 4e 36 f6 65 8b 05 ae 18 75 08 85 c0 74 16 5b
RSP: 0018:ffffc9000376fd78 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffffffff9b22e3d8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8df576cd RDI: ffffffff8c1e7180
RBP: 0000000000000283 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffffffffffff R12: 1ffff920006edfb6
R13: 000000000cf975d1 R14: 000000000cf975d1 R15: 0000000000000000
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline]
do_settimeofday64+0x326/0x4d0 kernel/time/timekeeping.c:1665
do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195
__do_sys_clock_settime kernel/time/posix-timers.c:1139 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1123 [inline]
__x64_sys_clock_settime+0x1c1/0x2a0 kernel/time/posix-timers.c:1123
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe434d9ce59
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:00007fe432ff6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007fe435015fa0 RCX: 00007fe434d9ce59
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007fe434e32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe435016038 R14: 00007fe435015fa0 R15: 00007ffc5577f318