rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5159/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=12689, q=606 ncpus=2)
task:udevd state:R running task stack:25160 pid:5159 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6866
preempt_schedule+0xab/0xc0 kernel/sched/core.c:6890
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0xfa/0x110 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__wake_up_common_lock kernel/sched/wait.c:140 [inline]
__wake_up_sync_key+0x11f/0x190 kernel/sched/wait.c:213
sock_def_readable+0x1e1/0x430 net/core/sock.c:3351
__netlink_sendskb net/netlink/af_netlink.c:1266 [inline]
netlink_sendskb+0x9b/0x130 net/netlink/af_netlink.c:1272
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
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: 0033:0x7f29b72a7407
RSP: 002b:00007ffd7e1124a0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f29b7960880 RCX: 00007f29b72a7407
RDX: 0000000000000000 RSI: 00007ffd7e112500 RDI: 0000000000000004
RBP: 000055dab5977f40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000000b3
R13: 000055dab59559e0 R14: 0000000000000000 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10532 jiffies! g12689 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:27752 pid:17 ppid:2 flags:0x00004000
Call Trace:
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
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: 6028 Comm: syz.2.24 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__lock_release kernel/locking/lockdep.c:5438 [inline]
RIP: 0010:lock_release+0x219/0x8b0 kernel/locking/lockdep.c:5774
Code: 89 e7 48 8b 74 24 18 e8 35 f7 06 09 44 89 7c 24 3c 44 89 fa 85 c0 0f 84 d7 01 00 00 4d 85 e4 0f 84 ff 02 00 00 4d 8d 74 24 24 <4c> 89 f0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 91 04 00 00 41 83
RSP: 0018:ffffc90000007ac0 EFLAGS: 00000086
RAX: 0000000000000001 RBX: 000000000000000a RCX: 0000000000000001
RDX: 0000000000000002 RSI: ffff888073b9ca18 RDI: ffff8880270b6530
RBP: ffffc90000007bd0 R08: ffffffff8e4a82ef R09: 1ffffffff1c9505d
R10: dffffc0000000000 R11: fffffbfff1c9505e R12: ffff8880270b6530
R13: dffffc0000000000 R14: ffff8880270b6554 R15: 0000000000000002
FS: 00007f5e50c3f6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 0000000079a66000 CR4: 00000000003506f0
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
_raw_spin_unlock_irqrestore+0x71/0x110 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
unlock_task_sighand include/linux/sched/signal.h:750 [inline]
send_sigqueue+0x4de/0x710 kernel/signal.c:2038
posix_timer_event kernel/time/posix-timers.c:299 [inline]
posix_timer_fn+0x16e/0x3d0 kernel/time/posix-timers.c:325
__run_hrtimer kernel/time/hrtimer.c:1750 [inline]
__hrtimer_run_queues+0x51e/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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 00 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 4a 63 ef f6 48 89 df e8 62 35 f0 f6 e8 ad db 13 f7 fb bf 01 00 00 00 72 5a e3 f6 65 8b 05 33 a5 8b 75 85 c0 74 02 5b c3 e8 50 89 88
RSP: 0018:ffffc90003717c98 EFLAGS: 00000282
RAX: bf061757294b7f00 RBX: ffff888073b9ca00 RCX: bf061757294b7f00
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001
RBP: ffff888073b9ce98 R08: ffffffff8e4a82ef R09: 1ffffffff1c9505d
R10: dffffc0000000000 R11: fffffbfff1c9505e R12: 1ffff1100e7739d3
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x11f5/0x1400 kernel/signal.c:2905
arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5e4fd8eec9
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:00007f5e50c3f038 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f5e4ffe5fa0 RCX: 00007f5e4fd8eec9
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5e4fe11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e4ffe6038 R14: 00007f5e4ffe5fa0 R15: 00007ffc763504c8
sched: RT throttling activated