rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18812/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=115937, q=1123 ncpus=2)
task:udevd state:R running task stack:24720 pid:18812 tgid:18812 ppid:4994 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1840/0x57a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x8e0 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 b1 00 01 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 ab 2b 95 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 7b fc 6e ff cc 48 8d 3d b8 a1 91
RSP: 0018:ffffc90004f1f160 EFLAGS: 00000286
RAX: 673c47503fc1df00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 0000000096cd8dd3 RSI: ffffffff8e213c86 RDI: ffffffff8c2899a0
RBP: ffffffff81aee4bd R08: ffffffff81aee4bd R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e95c780 R12: 0000000000000002
R13: ffffffff8e95c780 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
is_module_text_address+0x39/0x1e0 kernel/module/main.c:3921
kernel_text_address+0x94/0xe0 kernel/extable.c:119
__kernel_text_address+0xd/0x30 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6251 [inline]
kfree+0x1c5/0x640 mm/slub.c:6566
tomoyo_check_open_permission+0x32c/0x470 security/tomoyo/file.c:791
security_file_open+0xa9/0x240 security/security.c:2739
do_dentry_open+0x4a0/0x1380 fs/open.c:924
vfs_open+0x3b/0x340 fs/open.c:1079
do_open fs/namei.c:4699 [inline]
path_openat+0x2e3b/0x3890 fs/namei.c:4858
do_file_open+0x23e/0x4a0 fs/namei.c:4887
do_sys_openat2+0x113/0x200 fs/open.c:1364
do_sys_open fs/open.c:1370 [inline]
__do_sys_openat fs/open.c:1386 [inline]
__se_sys_openat fs/open.c:1381 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1381
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: 0033:0x7f49a7aa7407
RSP: 002b:00007ffec00875a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f49a82a8880 RCX: 00007f49a7aa7407
RDX: 0000000000080241 RSI: 00007ffec0087b00 RDI: ffffffffffffff9c
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001b6 R11: 0000000000000202 R12: 0000563366faadfc
R13: 0000563366faadfc R14: 0000000000000001 R15: 00005633943d8320
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g115937 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=65295
rcu: rcu_preempt kthread starved for 10502 jiffies! g115937 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:27688 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1840/0x57a0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x389/0x470 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6386 Comm: kworker/u8:12 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: netns cleanup_net
RIP: 0010:debug_activate kernel/time/hrtimer.c:529 [inline]
RIP: 0010:enqueue_hrtimer+0xad/0x2c0 kernel/time/hrtimer.c:1109
Code: 12 00 45 85 e4 0f 84 6c 01 00 00 e8 0d f9 12 00 eb 05 e8 06 f9 12 00 4c 89 f7 48 c7 c6 40 52 cf 8b e8 a7 61 08 03 41 0f b6 d7 <4c> 89 f7 89 ee e8 19 02 00 00 49 89 dc 49 c1 ec 03 43 80 3c 2c 00
RSP: 0018:ffffc90000007da0 EFLAGS: 00000082
RAX: 0000000000000000 RBX: ffff8880b86284c0 RCX: 0000000000010000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: ffffffff9a6ba04b R09: 1ffffffff34d7409
R10: dffffc0000000000 R11: fffffbfff34d740a R12: 0000000000000001
R13: dffffc0000000000 R14: ffff888089f42300 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881252b9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe9ea95f50 CR3: 0000000098ac3000 CR4: 0000000000350ef0
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1946 [inline]
__hrtimer_run_queues+0x4ce/0xa10 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7513
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 93 f8 ef f5 e8 3e f3 29 f6 fb bf 01 00 00 00 f3 a1 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 04 f5 29 f6 bf 01
RSP: 0018:ffffc900102b75e8 EFLAGS: 00000202
RAX: 00000000004539fd RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000006 RSI: ffffffff8dfa1a06 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff902f87f7 R09: 1ffffffff205f0fe
R10: dffffc0000000000 R11: fffffbfff205f0ff R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x8e0 kernel/entry/common.c:164
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_unregister_key+0x2d5/0x350 kernel/locking/lockdep.c:6616
Code: 91 03 09 00 89 c6 48 c7 c7 30 c8 3e 96 e8 03 88 03 0a 90 e9 65 fe ff ff e8 18 be 00 0a 41 f7 c7 00 02 00 00 74 b3 fb 40 84 ed <75> b2 eb c3 90 0f 0b 90 e9 26 ff ff ff 90 0f 0b 90 e9 2e ff ff ff
RSP: 0018:ffffc900102b7700 EFLAGS: 00000202
RAX: 0000000000000046 RBX: 0000000000000001 RCX: 0000000000000046
RDX: ffffffff93fa4398 RSI: ffffffff8dfbba05 RDI: ffffffff8c2899a0
RBP: ffff88807ae63e01 R08: ffffffff81aeb298 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e95c780 R12: 0000000000000000
R13: ffff888052dd8269 R14: 0000000000001000 R15: 0000000000000a47
qdisc_lock_uninit include/net/pkt_sched.h:332 [inline]
__qdisc_destroy+0x1ab/0x470 net/sched/sch_generic.c:1102
netdev_for_each_tx_queue include/linux/netdevice.h:2706 [inline]
dev_shutdown+0x92/0x450 net/sched/sch_generic.c:1490
unregister_netdevice_many_notify+0x11f5/0x2370 net/core/dev.c:12409
ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]
ops_undo_list+0x391/0x8d0 net/core/net_namespace.c:248
cleanup_net+0x572/0x810 net/core/net_namespace.c:702
process_one_work kernel/workqueue.c:3314 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
kthread+0x389/0x470 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