rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18481/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=91257, q=721 ncpus=2)
task:dhcpcd-run-hook state:R running task stack:27608 pid:18481 tgid:18481 ppid:18475 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x1560/0x20a0 arch/x86/kernel/unwind_orc.c:648
Code: 02 00 0f 84 50 f9 ff ff 4c 89 e7 e8 ca e7 bb 00 e9 43 f9 ff ff 48 ba 00 00 00 00 00 fc ff df 48 8d 79 02 48 89 f8 48 c1 e8 03 <0f> b6 34 10 48 8d 41 03 49 89 c0 49 c1 e8 03 41 0f b6 14 10 49 89
RSP: 0018:ffffc900052d7958 EFLAGS: 00000a02
RAX: 1ffffffff2240408 RBX: 0000000000000001 RCX: ffffffff91202040
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff91202042
RBP: ffffc900052d7a60 R08: ffffffff91202044 R09: 00000000ffffffff
R10: 0000000000000002 R11: 0000000000006cdb R12: ffffc900052d7a68
R13: ffffc900052d7a18 R14: ffffc900052d7a18 R15: ffffc900052d7a4c
__unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
slab_free_hook mm/slub.c:2501 [inline]
slab_free mm/slub.c:6663 [inline]
kmem_cache_free+0x15e/0x770 mm/slub.c:6774
file_free fs/file_table.c:79 [inline]
__fput+0x68d/0xb70 fs/file_table.c:481
fput_close_sync+0x118/0x260 fs/file_table.c:573
__do_sys_close fs/open.c:1573 [inline]
__se_sys_close fs/open.c:1558 [inline]
__x64_sys_close+0x8b/0x120 fs/open.c:1558
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0e5ce32a67
RSP: 002b:00007ffe09dfe608 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0e5ce32a67
RDX: 000000000000c571 RSI: 0000558f33aeda90 RDI: 0000000000000003
RBP: 0000558f33ae5bc4 R08: 0000000000004530 R09: 0000000000000000
R10: 0000558f33ae5bb9 R11: 0000000000000202 R12: 00007ffe09dfe758
R13: 0000558f33ae5bb8 R14: 0000000000000001 R15: 0000558f33aeca87
rcu: rcu_preempt kthread starved for 10430 jiffies! g91257 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27944 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
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: 18484 Comm: syz.0.2813 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x5a/0x70 kernel/kcov.c:223
Code: 35 8b 82 6c 16 00 00 85 c0 74 2b 8b 82 48 16 00 00 83 f8 02 75 20 48 8b 8a 50 16 00 00 8b 92 4c 16 00 00 48 8b 01 48 83 c0 01 <48> 39 d0 73 07 48 89 01 48 89 34 c1 e9 c5 3e bb 09 0f 1f 44 00 00
RSP: 0018:ffffc9000478f5f8 EFLAGS: 00000016
RAX: 0000000000080000 RBX: ffffc9000478f738 RCX: ffffc9000f50a000
RDX: 0000000000080000 RSI: ffffffff816e35e3 RDI: 0000000000000005
RBP: ffffffff8df49c5c R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000010 R11: 0000000000000000 R12: ffffc9000478f748
R13: 00000000fff21d11 R14: ffffffff8df49c64 R15: ffffc9000478f7b8
FS: 00007f303ccb96c0(0000) GS:ffff888124a09000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffc CR3: 000000007e3ee000 CR4: 00000000003526f0
Call Trace:
ex_handler_imm_reg arch/x86/mm/extable.c:206 [inline]
fixup_exception+0x7b3/0xf90 arch/x86/mm/extable.c:360
kernelmode_fixup_or_oops.constprop.0+0x6c/0xe0 arch/x86/mm/fault.c:726
__bad_area_nosemaphore+0x38b/0x690 arch/x86/mm/fault.c:783
do_kern_addr_fault+0x5b/0x80 arch/x86/mm/fault.c:1196
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0xb2/0xc0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:strncpy_from_kernel_nofault+0xf4/0x260 mm/maccess.c:97
Code: 0f 84 d1 00 00 00 e8 9b 81 c4 ff 4c 89 f6 4c 89 ef e8 a0 7b c4 ff 4d 39 f5 0f 8d b8 00 00 00 4c 89 fb e8 7f 81 c4 ff 45 31 ed <8a> 45 00 48 b9 00 00 00 00 00 fc ff df 41 89 c4 48 89 d8 48 89 da
RSP: 0018:ffffc9000478f7e8 EFLAGS: 00010246
RAX: 0000000000080000 RBX: ffffc9000478f848 RCX: ffffc9000f50a000
RDX: 0000000000080000 RSI: ffffffff81fa62f1 RDI: ffff888030d63c94
RBP: fffffffffffffffc R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88801bed9448 R12: ffffc9000478f848
R13: 0000000000000000 R14: 0000000000000008 R15: fffffffffffffffc
bpf_probe_read_kernel_str_common kernel/trace/bpf_trace.c:264 [inline]
____bpf_probe_read_kernel_str kernel/trace/bpf_trace.c:273 [inline]
bpf_probe_read_kernel_str+0x26/0x70 kernel/trace/bpf_trace.c:270
bpf_prog_6c8a88f82979c0f2+0x4b/0x51
bpf_dispatcher_nop_func include/linux/bpf.h:1376 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x3d2/0xb50 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x1035/0x31a0 net/bpf/test_run.c:1158
bpf_prog_test_run kernel/bpf/syscall.c:4703 [inline]
__sys_bpf+0x1035/0x4980 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6272
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f303bd8f749
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:00007f303ccb9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f303bfe6180 RCX: 00007f303bd8f749
RDX: 0000000000000050 RSI: 00002000000002c0 RDI: 000000000000000a
RBP: 00007f303be13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f303bfe6218 R14: 00007f303bfe6180 R15: 00007ffc7f49a8a8