rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5992/1:b..l P23413/1:b..l P23527/1:b..l P5600/2:b..l
rcu: (detected by 0, t=10502 jiffies, g=105969, q=2410 ncpus=2)
task:udevd state:R running task stack:24832 pid:5600 tgid:5600 ppid:4975 task_flags:0x400140 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:trace_lock_release include/trace/events/lock.h:68 [inline]
RIP: 0010:lock_release+0x40/0x310 kernel/locking/lockdep.c:5879
Code: 2d 3d ab 2b 12 48 89 6c 24 10 48 89 f5 0f 1f 44 00 00 65 8b 05 55 ab 2b 12 83 f8 07 0f 87 07 02 00 00 48 0f a3 05 a0 39 f5 0e <0f> 82 02 02 00 00 44 8b 05 67 6d f5 0e 45 85 c0 0f 84 48 01 00 00
RSP: 0018:ffffc90003ad73f8 EFLAGS: 00000297
RAX: 0000000000000001 RBX: ffffffff8e7e6040 RCX: ffffffff9188e101
RDX: ffffc90003ad7818 RSI: ffffffff81b766ae RDI: ffffffff8e7e6040
RBP: ffffffff81b766ae R08: ffffffff9188e202 R09: 0000000000000000
R10: ffffc90003ad74b0 R11: 00000000000179a3 R12: ffffc90003ad7500
R13: ffffc90003ad74b0 R14: ffffc90003ad7810 R15: ffffc90003ad74e4
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1183 [inline]
unwind_next_frame+0x3c3/0x2090 arch/x86/kernel/unwind_orc.c:495
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
_kmalloc_noprof include/linux/slab.h:969 [inline]
proc_thread_self_get_link+0x1a6/0x210 fs/proc/thread_self.c:22
pick_link+0xac2/0x13c0 fs/namei.c:2064
step_into_slowpath+0x9ba/0xf90 fs/namei.c:2127
step_into fs/namei.c:2152 [inline]
walk_component fs/namei.c:2288 [inline]
link_path_walk+0xf28/0x1cc0 fs/namei.c:2656
path_openat+0x1c9/0x4280 fs/namei.c:4855
do_file_open+0x20e/0x430 fs/namei.c:4888
do_sys_openat2+0x10f/0x1e0 fs/open.c:1395
do_sys_open fs/open.c:1401 [inline]
__do_sys_openat fs/open.c:1417 [inline]
__se_sys_openat fs/open.c:1412 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1412
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: 0033:0x7f44aeca7407
RSP: 002b:00007ffe65c71010 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f44af3b2880 RCX: 00007f44aeca7407
RDX: 0000000000080002 RSI: 000056042fb62fe0 RDI: ffffffffffffff9c
RBP: 000056042fb782a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000056042f930615
R13: 00007f44af3b2770 R14: 00007ffe65c710b0 R15: 000056042f930610
task:dhcpcd-run-hook state:R running task stack:28496 pid:23527 tgid:23527 ppid:23413 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7228
preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7409
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
wp_page_copy mm/memory.c:3976 [inline]
do_wp_page+0x13d2/0x4350 mm/memory.c:4336
handle_pte_fault mm/memory.c:6395 [inline]
__handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6517
handle_mm_fault+0x37b/0xa30 mm/memory.c:6686
do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f11527fd388
RSP: 002b:00007ffc78a38590 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000210 RCX: 0000000000000001
RDX: 0000558d10cb5060 RSI: 0000000000040000 RDI: 00007f1152936c30
RBP: 00007f1152936ac0 R08: 000000000000001f R09: 0000000000000210
R10: 00007f1152936c30 R11: 0000000000000000 R12: 0000000000000200
R13: 0000000000000021 R14: ffffffffffffffc0 R15: 00007f1152936b20
task:dhcpcd-run-hook state:R running task stack:25256 pid:23413 tgid:23413 ppid:5271 task_flags:0x400000 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_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679
RIP: 0010:__sanitizer_cov_trace_pc+0x2a/0x70 kernel/kcov.c:235
Code: f3 0f 1e fa 65 8b 05 05 41 07 12 48 8b 34 24 65 48 8b 15 e1 40 07 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 51 a2 90 09 8b 82 24 17 00 00 85 c0 74 f1 8b 82 f8 16 00 00 83
RSP: 0000:ffffc90006eafae0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff84e73ab3
RDX: ffff888037af0000 RSI: ffffffff84e73adb RDI: ffffffff9b398148
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000012 R12: dffffc0000000000
R13: ffffea0002941f80 R14: 0000000000000000 R15: ffffea00004c8840
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
blk_cgroup_congested+0x10b/0x270 block/blk-cgroup.c:2211
__folio_throttle_swaprate+0x3d/0x190 mm/swapfile.c:3890
folio_throttle_swaprate include/linux/swap.h:567 [inline]
folio_prealloc mm/memory.c:1218 [inline]
wp_page_copy mm/memory.c:3875 [inline]
do_wp_page+0xdd6/0x4350 mm/memory.c:4336
handle_pte_fault mm/memory.c:6395 [inline]
__handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6517
handle_mm_fault+0x37b/0xa30 mm/memory.c:6686
do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f115298c878
RSP: 002b:00007ffc78a38700 EFLAGS: 00010202
RAX: 0000558d10cb4280 RBX: 0000558d10cb4280 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000005be7 R08: 00007f1152937b60 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000558d10cb0168
R13: 00007f1152a06460 R14: 00000000ffffffff R15: 0000000000000000
task:udevd state:R running task stack:23704 pid:5992 tgid:5992 ppid:4975 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7228
preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7409
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
copy_pte_range mm/memory.c:1347 [inline]
copy_pmd_range mm/memory.c:1408 [inline]
copy_pud_range mm/memory.c:1445 [inline]
copy_p4d_range mm/memory.c:1469 [inline]
copy_page_range+0x1c1f/0x5b20 mm/memory.c:1555
dup_mmap+0xd44/0x21b0 mm/mmap.c:1840
dup_mm kernel/fork.c:1538 [inline]
copy_mm kernel/fork.c:1590 [inline]
copy_process+0x4588/0x7ff0 kernel/fork.c:2288
kernel_clone+0x176/0x9d0 kernel/fork.c:2746
__do_sys_clone+0xd9/0x120 kernel/fork.c:2887
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: 0033:0x7f44aecf1636
RSP: 002b:00007ffe65c6b790 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe65c6b798 RCX: 00007f44aecf1636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 000056042fb72930 R08: 0000000000000000 R09: 0000560407b8c140
R10: 00007f44af3b2b50 R11: 0000000000000246 R12: 000056042fb7a680
R13: 0000000000000000 R14: 0000000000000000 R15: 0000560407b714be
rcu: rcu_preempt kthread starved for 10497 jiffies! g105969 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:26440 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:
CPU: 0 UID: 0 PID: 8079 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 05/09/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0x589/0x16c0 kernel/smp.c:892
Code: b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 b9 95 0c 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 2c 0f 00 00 8b 45 08 31
RSP: 0018:ffffc9000378f878 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81fcc98d
RDX: ffff88807d334a80 RSI: ffffffff81fcc967 RDI: ffff88807d334a80
RBP: ffff8880b85410c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170a8219 R14: 0000000000000001 R15: ffff8880b843c700
FS: 0000000000000000(0000) GS:ffff888124316000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001bc030 CR3: 000000000e592000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x40/0x90 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+0x337/0xc60 arch/x86/kernel/alternative.c:2983
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
jump_label_update+0x37a/0x550 kernel/jump_label.c:910
static_key_enable_cpuslocked+0x1bc/0x270 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate mm/kfence/core.c:911 [inline]
toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:903
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
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