rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5832/1:b..l P5204/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=30589, q=142 ncpus=2)
task:udevd state:R running task stack:21856 pid:5204 tgid:5204 ppid:1 task_flags:0x40054c flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6765
preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6944
preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6968
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
zap_pte_range mm/memory.c:1772 [inline]
zap_pmd_range mm/memory.c:1834 [inline]
zap_pud_range mm/memory.c:1863 [inline]
zap_p4d_range mm/memory.c:1884 [inline]
unmap_page_range+0x3a0d/0x4510 mm/memory.c:1905
unmap_vmas+0x3cc/0x5f0 mm/memory.c:1995
exit_mmap+0x283/0xd40 mm/mmap.c:1284
__mmput+0x115/0x420 kernel/fork.c:1356
exit_mm+0x220/0x310 kernel/exit.c:570
do_exit+0x9ad/0x28e0 kernel/exit.c:925
do_group_exit+0x207/0x2c0 kernel/exit.c:1087
get_signal+0x168c/0x1720 kernel/signal.c:3036
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1dddb1a477
RSP: 002b:00007ffe6ebb81a8 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: 000000000000000d RBX: 000055bc295bddf0 RCX: 00007f1dddb1a477
RDX: 0000000000090800 RSI: 000055bc295bf310 RDI: 00000000ffffff9c
RBP: 000055bc295d4150 R08: 0000000000090800 R09: 000055bc295bf310
R10: 0000000000000000 R11: 0000000000000287 R12: 000055bc295bf310
R13: 00000000000000ff R14: 000055bc161f01c4 R15: 0000000000000000
task:syz-executor state:R running task stack:14448 pid:5832 tgid:5832 ppid:5828 task_flags:0x400140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6765
preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6944
preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6968
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1201 [inline]
copy_pmd_range+0x6ddc/0x77b0 mm/memory.c:1262
copy_pud_range mm/memory.c:1299 [inline]
copy_p4d_range mm/memory.c:1323 [inline]
copy_page_range+0x99f/0xe90 mm/memory.c:1421
dup_mmap kernel/fork.c:748 [inline]
dup_mm kernel/fork.c:1700 [inline]
copy_mm+0x1269/0x2160 kernel/fork.c:1752
copy_process+0x17d1/0x3cf0 kernel/fork.c:2403
kernel_clone+0x226/0x8e0 kernel/fork.c:2815
__do_sys_clone kernel/fork.c:2958 [inline]
__se_sys_clone kernel/fork.c:2942 [inline]
__x64_sys_clone+0x267/0x2e0 kernel/fork.c:2942
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0dab1839d3
RSP: 002b:00007fff154eacd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0dab1839d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000555567c537d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000003ca96 R15: 00007fff154eae70
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g30589 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=16259
rcu: rcu_preempt kthread starved for 10502 jiffies! g30589 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:26104 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
kthread+0x7ab/0x920 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8913 Comm: syz.3.1091 Not tainted 6.14.0-rc4-syzkaller-00242-g7a5668899f54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:230 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4853 [inline]
RIP: 0010:__lock_acquire+0x5bf/0x2100 kernel/locking/lockdep.c:5178
Code: 41 8b 1f 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 40 98 54 94 be 08 00 00 00 e8 c9 3d 8c 00 48 0f a3 1d 31 da b7 12 <73> 22 48 69 c3 c8 00 00 00 48 8d 98 00 17 ec 93 48 ba 00 00 00 00
RSP: 0018:ffffc90000a18930 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff819cbe07
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff94549840
RBP: 0000000000000002 R08: ffffffff94549847 R09: 1ffffffff28a9308
R10: dffffc0000000000 R11: fffffbfff28a9309 R12: ffff8880271a0ad4
R13: 000000000000000a R14: 1ffff11004e3416c R15: ffff8880271a0b60
FS: 00007f027e6646c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3051fffc CR3: 000000007b662000 CR4: 0000000000350ef0
Call Trace:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
debug_object_deactivate+0x158/0x390 lib/debugobjects.c:873
debug_hrtimer_deactivate kernel/time/hrtimer.c:460 [inline]
debug_deactivate+0x1b/0x220 kernel/time/hrtimer.c:502
__run_hrtimer kernel/time/hrtimer.c:1769 [inline]
__hrtimer_run_queues+0x305/0xd30 kernel/time/hrtimer.c:1865
hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 be d3 1d f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 53 3d 84 f5 65 8b 05 c4 b0 f8 73 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc90003347ba0 EFLAGS: 00000206
RAX: 5edd81037a6c9500 RBX: 1ffff92000668f78 RCX: ffffffff819d2afa
RDX: dffffc0000000000 RSI: ffffffff8c2aa4a0 RDI: 0000000000000001
RBP: ffffc90003347c30 R08: ffffffff94549847 R09: 1ffffffff28a9308
R10: dffffc0000000000 R11: fffffbfff28a9309 R12: dffffc0000000000
R13: 1ffff92000668f74 R14: ffffc90003347bc0 R15: 0000000000000246
clock_was_set+0x686/0x810 kernel/time/hrtimer.c:984
do_settimeofday64+0x343/0x5e0 kernel/time/timekeeping.c:1381
__do_sys_clock_settime kernel/time/posix-timers.c:1135 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1119 [inline]
__x64_sys_clock_settime+0x23c/0x280 kernel/time/posix-timers.c:1119
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f027d78d169
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:00007f027e664038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f027d9a5fa0 RCX: 00007f027d78d169
RDX: 0000000000000000 RSI: 0000400000000240 RDI: 0000000000000000
RBP: 00007f027d80e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f027d9a5fa0 R15: 00007ffd84359208