rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8795/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=57997, q=865 ncpus=1)
task:dhcpcd-run-hook state:R running task stack:24200 pid:8795 tgid:8795 ppid:5268 task_flags:0x400000 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:bpf_tree_comp kernel/bpf/core.c:616 [inline]
RIP: 0010:__lt_find include/linux/rbtree_latch.h:115 [inline]
RIP: 0010:latch_tree_find include/linux/rbtree_latch.h:210 [inline]
RIP: 0010:bpf_ksym_find kernel/bpf/core.c:716 [inline]
RIP: 0010:is_bpf_text_address+0x113/0x2b0 kernel/bpf/core.c:749
Code: e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 b6 55 5d 00 4d 8b 3f 4d 85 ff 0f 84 c1 00 00 00 4c 89 24 24 c1 e3 03 8d 2c 5b 48 f7 dd <4d> 8d 24 2f 49 81 c4 e0 fd ff ff 4c 89 e0 48 c1 e8 03 42 80 3c 28
RSP: 0018:ffffc900031e7810 EFLAGS: 00000293
RAX: ffffffff81d75679 RBX: 0000000000000000 RCX: ffff88802ee30000
RDX: 0000000000000000 RSI: 00007f10e26a5407 RDI: ffffffffa0007dc0
RBP: 0000000000000000 R08: ffffffff81d754e6 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59ca0 R12: ffffffffa0007dc0
R13: dffffc0000000000 R14: 00007f10e26a5407 R15: ffff88807a012420
kernel_text_address+0xa5/0xe0 kernel/extable.c:125
__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
save_stack+0x122/0x230 mm/page_owner.c:165
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950
__slab_free+0x274/0x2c0 mm/slub.c:5741
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4584 [inline]
slab_alloc_node mm/slub.c:4917 [inline]
kmem_cache_alloc_noprof+0x2a0/0x5f0 mm/slub.c:4931
alloc_filename fs/namei.c:147 [inline]
do_getname+0x2e/0x250 fs/namei.c:187
class_filename_flags_constructor include/linux/fs.h:2566 [inline]
do_sys_openat2+0xcc/0x200 fs/open.c:1367
do_sys_open fs/open.c:1374 [inline]
__do_sys_openat fs/open.c:1390 [inline]
__se_sys_openat fs/open.c:1385 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1385
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: 0033:0x7f10e26a5407
RSP: 002b:00007ffca7e1d680 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f10e2555c80 RCX: 00007f10e26a5407
RDX: 0000000000080000 RSI: 00007ffca7e1de0f RDI: ffffffffffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffca7e1de0f
R13: 0000558c242ee910 R14: 00007f10e28ff000 R15: 0000558beeb6bd98
rcu: rcu_preempt kthread starved for 366 jiffies! g57997 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:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
kthread+0x388/0x470 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:
CPU: 0 UID: 0 PID: 6 Comm: kworker/R-kvfre Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: 0x0 (kvfree_rcu_reclaim)
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 3d 3d ce f5 f7 c3 00 02 00 00 74 05 e8 c0 1d fa f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 d4 50 bf f5 65 8b 05 9d 50 98 07 85 c0 74 18 5b 41 5e e9 6c 21
RSP: 0018:ffffc90000007b08 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000080000101
RDX: 0000000000000002 RSI: ffffffff8e22c9b1 RDI: 0000000000000001
RBP: ffffc90000007e10 R08: ffffffff90578f37 R09: 1ffffffff20af1e6
R10: dffffc0000000000 R11: fffffbfff20af1e7 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff888028974000 R15: ffff888029449410
FS: 0000000000000000(0000) GS:ffff888124f49000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc1e663db4 CR3: 000000007f7d3000 CR4: 0000000000350ef0
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
dummy_timer+0x497b/0x4cf0 drivers/usb/gadget/udc/dummy_hcd.c:-1
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2096
hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113
handle_softirqs+0x225/0x840 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:pool_allowed_cpus kernel/workqueue.c:2719 [inline]
RIP: 0010:worker_attach_to_pool+0x178/0x390 kernel/workqueue.c:2752
Code: 3e 4a 37 00 e9 83 00 00 00 4c 8d a3 d8 03 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 dc f3 a4 00 49 8b 04 24 <4c> 8d 60 18 4c 89 e1 48 c1 e9 03 42 0f b6 0c 29 84 c9 0f 85 cf 01
RSP: 0018:ffffc900000b7ca8 EFLAGS: 00000246
RAX: ffff88801b05cd00 RBX: ffff88801b07b000 RCX: 0000000000000000
RDX: ffff88801daabe00 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffffffff90578f37 R09: 1ffffffff20af1e6
R10: dffffc0000000000 R11: fffffbfff20af1e7 R12: ffff88801b07b3d8
R13: dffffc0000000000 R14: ffff88801b040b00 R15: ffff88801daabe00
rescuer_thread+0x335/0x10b0 kernel/workqueue.c:3622
kthread+0x388/0x470 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