rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=d7ec/1/0x4000000000000000 softirq=72337/72338 fqs=0
rcu: (detected by 1, t=10502 jiffies, g=90049, q=127 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 14421 Comm: syz.5.2463 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:mark_lock+0x28/0xa20 kernel/locking/lockdep.c:4714
Code: 90 90 55 48 89 e5 41 57 41 56 41 55 49 89 fd 41 54 49 89 f4 53 48 83 e4 f0 48 83 ec 70 65 48 8b 1d 95 30 26 12 48 89 5c 24 68 <89> d3 83 fa 08 74 6d 41 be 01 00 00 00 89 d9 41 d3 e6 4d 63 f6 41
RSP: 0018:ffffc90000007be0 EFLAGS: 00000082
RAX: 0000000000000000 RBX: fa281bf23d572100 RCX: 0000000000000000
RDX: 0000000000000008 RSI: ffff888038bfb090 RDI: ffff888038bfa500
RBP: ffffc90000007c80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888038bfb090
R13: ffff888038bfa500 R14: 0000000000020000 R15: 0000000000000003
FS: 00007f9cc8bdd6c0(0000) GS:ffff888124379000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9cc7e4f0d1 CR3: 0000000055459000 CR4: 00000000003526f0
Call Trace:
mark_usage kernel/locking/lockdep.c:4674 [inline]
__lock_acquire+0x4a5/0x2630 kernel/locking/lockdep.c:5191
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
advance_sched+0x718/0xd20 net/sched/sch_taprio.c:992
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 66 e6 57 f6 48 89 df e8 3e 36 58 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 a5 09 48 f6 65 8b 05 fe de 7d 08 85 c0 74 16 5b
RSP: 0018:ffffc90006e87b28 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9b1a2118 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8df1e81e RDI: ffffffff8c1c3480
RBP: 0000000000000286 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000800000000 R12: ffffffff9b1a1e80
R13: 0000000000000001 R14: ffffc90006e87c80 R15: ffffffff9b1a205c
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline]
__do_adjtimex+0x892/0xe70 kernel/time/timekeeping.c:2871
do_adjtimex+0xa0/0x370 kernel/time/timekeeping.c:2914
do_clock_adjtime kernel/time/posix-timers.c:1154 [inline]
__do_sys_clock_adjtime+0x177/0x290 kernel/time/posix-timers.c:1166
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9cc7d9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9cc8bdd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f9cc8015fa0 RCX: 00007f9cc7d9cdd9
RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000000000000000
RBP: 00007f9cc7e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9cc8016038 R14: 00007f9cc8015fa0 R15: 00007fffe5ac09f8
rcu: rcu_preempt kthread starved for 10502 jiffies! g90049 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:27848 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
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: 1 UID: 0 PID: 14422 Comm: syz.2.2462 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x54/0x70 kernel/kcov.c:222
Code: e9 51 4f 84 09 8b 82 cc 16 00 00 85 c0 74 f1 8b 82 a8 16 00 00 83 f8 02 75 e6 48 8b 8a b0 16 00 00 8b 92 ac 16 00 00 48 8b 01 <48> 83 c0 01 48 39 d0 73 cd 48 89 01 48 89 34 c1 e9 17 4f 84 09 0f
RSP: 0018:ffffc90007467758 EFLAGS: 00000246
RAX: 000000000007ffff RBX: 0000000000000000 RCX: ffffc9000f8a3000
RDX: 0000000000080000 RSI: ffffffff81fc0f17 RDI: ffff888034398000
RBP: ffff8880b8443320 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed1017088665 R14: 0000000000000001 R15: ffff8880b853c5c0
FS: 00007fefbe00e6c0(0000) GS:ffff888124479000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33104ff8 CR3: 0000000021ff4000 CR4: 00000000003526f0
Call Trace:
native_pause arch/x86/include/asm/vdso/processor.h:13 [inline]
cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
csd_lock_wait kernel/smp.c:342 [inline]
smp_call_function_many_cond+0x587/0x1700 kernel/smp.c:892
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_slow_inc_cpuslocked kernel/jump_label.c:168 [inline]
static_key_slow_inc_cpuslocked+0x82/0x120 kernel/jump_label.c:151
static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:191
__kvm_apic_set_base+0x579/0xa40 arch/x86/kvm/lapic.c:2766
kvm_apic_set_base+0x184/0x200 arch/x86/kvm/lapic.c:2813
__set_sregs_common.constprop.0+0x4aa/0x1b50 arch/x86/kvm/x86.c:12460
__set_sregs+0x7e/0x260 arch/x86/kvm/x86.c:12524
kvm_arch_vcpu_ioctl_set_sregs+0xce/0x110 arch/x86/kvm/x86.c:12590
kvm_vcpu_ioctl+0x8ee/0x1720 virt/kvm/kvm_main.c:4532
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fefbd19cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fefbe00e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fefbd416090 RCX: 00007fefbd19cdd9
RDX: 0000200000000180 RSI: 000000004138ae84 RDI: 0000000000000005
RBP: 00007fefbd232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fefbd416128 R14: 00007fefbd416090 R15: 00007ffd40e54f18