rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 ticks this GP) idle=be64/1/0x4000000000000000 softirq=21973/21973 fqs=0
rcu: (detected by 1, t=10502 jiffies, g=16949, q=904 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6532 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x44/0x3e0 kernel/locking/lockdep.c:5879
Code: 8b 05 80 4d d1 10 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 83 4d d1 10 83 f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 ac a1 df 0d <73> 16 e8 45 ec 08 00 84 c0 75 0d f6 05 77 ac c9 0d 01 0f 84 ad 02
RSP: 0018:ffffc90000007c18 EFLAGS: 00000093
RAX: 0000000000000000 RBX: 0000000000000802 RCX: 0000000000000002
RDX: 0000000000000001 RSI: ffffffff81adda9d RDI: ffffffff999e0c88
RBP: ffffc90000007d08 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f70 R12: dffffc0000000000
R13: ffffffff81adda9d R14: ffffffff999e0c88 R15: 1ffff92000000f90
FS: 0000000000000000(0000) GS:ffff888126135000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2971084286 CR3: 000000003043e000 CR4: 00000000003526f0
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
_raw_spin_unlock_irqrestore+0x70/0x110 kernel/locking/spinlock.c:194
debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline]
debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:483
__run_hrtimer kernel/time/hrtimer.c:1745 [inline]
__hrtimer_run_queues+0x2b0/0xc60 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:kasan_check_byte include/linux/kasan.h:401 [inline]
RIP: 0010:lock_acquire+0x85/0x360 kernel/locking/lockdep.c:5842
Code: 61 fd 08 00 84 c0 75 0d f6 05 90 bd c9 0d 01 0f 84 d7 01 00 00 83 3d c9 e2 df 0d 00 0f 84 f0 00 00 00 48 8b b4 24 90 00 00 00 <4c> 89 ef e8 73 48 88 00 83 3d ac e2 df 0d 00 0f 84 fa 00 00 00 65
RSP: 0018:ffffc90003e0ef18 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: f9bc26b22341e000
RDX: 0000000000000000 RSI: ffffffff81738c62 RDI: ffffffff8bbf0880
RBP: ffffffff81738c45 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90003e0f138 R11: fffff520007c1e29 R12: 0000000000000002
R13: ffffffff8df3d6e0 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
__unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
__kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2543 [inline]
slab_free mm/slub.c:6642 [inline]
kmem_cache_free+0x19b/0x690 mm/slub.c:6752
anon_vma_chain_free mm/rmap.c:146 [inline]
unlink_anon_vmas+0x2cc/0x670 mm/rmap.c:420
free_pgtables+0x72b/0x9c0 mm/memory.c:414
exit_mmap+0x43c/0xb40 mm/mmap.c:1291
__mmput+0x118/0x430 kernel/fork.c:1133
exec_mmap+0x6ac/0x7d0 fs/exec.c:901
begin_new_exec+0x12d6/0x2160 fs/exec.c:1156
load_elf_binary+0x998/0x2740 fs/binfmt_elf.c:1010
search_binary_handler fs/exec.c:1670 [inline]
exec_binprm fs/exec.c:1702 [inline]
bprm_execve+0x99c/0x1450 fs/exec.c:1754
do_execveat_common+0x510/0x6a0 fs/exec.c:1860
do_execve fs/exec.c:1934 [inline]
__do_sys_execve fs/exec.c:2010 [inline]
__se_sys_execve fs/exec.c:2005 [inline]
__x64_sys_execve+0x94/0xb0 fs/exec.c:2005
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2970fca107
Code: Unable to access opcode bytes at 0x7f2970fca0dd.
RSP: 002b:00007fff5f016988 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055f78252e078 RCX: 00007f2970fca107
RDX: 000055f78252e0a0 RSI: 000055f78252e078 RDI: 000055f78252e130
RBP: 000055f78252e130 R08: 00007fff5f01ae8d R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000055f78252e0a0
R13: 00007f297118fe8b R14: 000055f78252e0a0 R15: 0000000000000000
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g16949 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=7763
rcu: rcu_preempt kthread starved for 10502 jiffies! g16949 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:27224 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245