rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=3d74/1/0x4000000000000000 softirq=131673/131675 fqs=1
rcu: (detected by 0, t=10502 jiffies, g=115489, q=625 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5493 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:mark_usage kernel/locking/lockdep.c:4652 [inline]
RIP: 0010:__lock_acquire+0x68c/0xd20 kernel/locking/lockdep.c:5191
Code: 42 06 00 00 83 bf 14 0b 00 00 00 74 1d 48 8b 3c 24 4c 89 f6 ba 04 00 00 00 e8 b0 25 00 00 48 8b 3c 24 85 c0 0f 84 19 06 00 00 <41> 8b 46 20 a9 00 00 18 00 0f 84 b3 00 00 00 4c 89 f6 ba 08 00 00
RSP: 0018:ffffc90000a08b70 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff93187960
RDX: 0000000000000000 RSI: ffff8880304da998 RDI: ffff8880304d9e40
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81add4b2
R10: dffffc0000000000 R11: fffffbfff1efa82f R12: ffffffffffffff02
R13: 0000000000000002 R14: ffff8880304da998 R15: 0000000000000000
FS: 00007f38ec532740(0000) GS:ffff888126029000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000268 CR3: 000000007dd36000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:170
__run_hrtimer kernel/time/hrtimer.c:1781 [inline]
__hrtimer_run_queues+0x602/0xc60 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:seqcount_lockdep_reader_access+0x17d/0x1c0 include/linux/seqlock.h:75
Code: ff 4d 85 ed 75 16 e8 02 dd 83 ff eb 15 e8 fb dc 83 ff e8 76 51 0c 09 4d 85 ed 74 ea e8 ec dc 83 ff fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 27 00 00 00 00 66 43 c7 44 27 09 00 00 43 c6 44 27 0b 00
RSP: 0018:ffffc90003cdf980 EFLAGS: 00000293
RAX: ffffffff823c50a4 RBX: 0000000000000000 RCX: ffff8880304d9e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003cdfa40 R08: ffffffff8f7d4177 R09: 1ffffffff1efa82e
R10: dffffc0000000000 R11: fffffbfff1efa82f R12: dffffc0000000000
R13: 0000000000000200 R14: ffffffff823c56a1 R15: 1ffff9200079bf30
read_seqbegin include/linux/seqlock.h:836 [inline]
set_root+0x161/0x3b0 fs/namei.c:1015
nd_jump_root+0x2b4/0x430 fs/namei.c:1036
path_init+0x373/0x1350 fs/namei.c:2583
path_lookupat+0x27/0x430 fs/namei.c:2666
filename_lookup+0x212/0x570 fs/namei.c:2705
do_readlinkat+0xd9/0x500 fs/stat.c:576
__do_sys_readlink fs/stat.c:613 [inline]
__se_sys_readlink fs/stat.c:610 [inline]
__x64_sys_readlink+0x7f/0x90 fs/stat.c:610
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: 0033:0x7f38ec62a3a7
Code: 00 00 90 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 00 31 c9 e8 8a 20 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 21 ba 0d 00 f7 d8 64 89 02 48
RSP: 002b:00007ffde264bc48 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffde264c120 RCX: 00007f38ec62a3a7
RDX: 0000000000000400 RSI: 00007ffde264bc50 RDI: 00007ffde264c120
RBP: 00007ffde264bc50 R08: 00007f38ec5223cc R09: 00007ffde265d230
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000400
R13: 000055e5b313b3c0 R14: 00007ffde264c950 R15: 00007ffde265d1a0
rcu: rcu_preempt kthread starved for 10500 jiffies! g115489 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:27128 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5254 [inline]
__schedule+0x17c4/0x4d60 kernel/sched/core.c:6862
__schedule_loop kernel/sched/core.c:6944 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6959
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
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 20224 Comm: syz.5.2685 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 56 70 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 6c 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 e5 6b
RSP: 0018:ffffc9000432f860 EFLAGS: 00000293
RAX: ffffffff81b4c1ab RBX: 1ffff110170e7ffd RCX: ffff88801d2b8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000432f9e0 R08: ffffffff8f7d4177 R09: 1ffffffff1efa82e
R10: dffffc0000000000 R11: fffffbfff1efa82f R12: ffff8880b873ffe8
R13: dffffc0000000000 R14: ffff8880b863b200 R15: 0000000000000001
FS: 000055557357a500(0000) GS:ffff888125f29000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f333625a9b0 CR3: 000000007d5aa000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2697 [inline]
smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2907
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
__static_key_slow_dec_cpuslocked+0xbe/0x140 kernel/jump_label.c:315
__static_key_slow_dec kernel/jump_label.c:321 [inline]
static_key_slow_dec+0x45/0x90 kernel/jump_label.c:336
kvm_arch_vcpu_destroy+0x217/0x380 arch/x86/kvm/x86.c:12779
kvm_vcpu_destroy virt/kvm/kvm_main.c:468 [inline]
kvm_destroy_vcpus+0x11d/0x370 virt/kvm/kvm_main.c:488
kvm_arch_destroy_vm+0xc8/0x280 arch/x86/kvm/x86.c:13289
kvm_destroy_vm virt/kvm/kvm_main.c:1316 [inline]
kvm_put_kvm+0x6ca/0xa80 virt/kvm/kvm_main.c:1353
kvm_vm_release+0x43/0x50 virt/kvm/kvm_main.c:1376
__fput+0x44c/0xa70 fs/file_table.c:468
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f348f58efc9
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:00007ffd4e4f95c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000124518 RCX: 00007f348f58efc9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f348f7e7da0 R08: 0000000000000001 R09: 0000000e4e4f98bf
R10: 0000001b2f020000 R11: 0000000000000246 R12: 00007f348f7e5fac
R13: 00007f348f7e5fa0 R14: ffffffffffffffff R15: 00007ffd4e4f96e0