rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10223/2:b..l
(detected by 0, t=10502 jiffies, g=40785, q=135)
task:cmp state:R running task stack:27216 pid:10223 ppid: 10195 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x60 kernel/kcov.c:206
Code: 48 8b 3d 70 13 12 0c 48 89 de 5b e9 47 5a 44 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d 04 73 89 7e 65 8b 15 05 73 89 7e <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 34 16 00 00
RSP: 0018:ffffc900029d7328 EFLAGS: 00000246
RAX: ffffffff83b0f736 RBX: 00000000ffffffff RCX: ffff8880274cd940
RDX: 0000000080000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff203dc18
R10: dffffc0000000000 R11: fffffbfff203dc19 R12: 1ffff11004e87b43
R13: ffffffff8c8d6508 R14: 0000000000000000 R15: dffffc0000000000
setid_policy_lookup+0x16/0x510 security/safesetid/lsm.c:67
safesetid_security_capable+0x88/0x1b0 security/safesetid/lsm.c:119
security_capable+0x75/0xb0 security/security.c:809
has_ns_capability_noaudit+0x106/0x200 kernel/capability.c:341
ima_match_rules security/integrity/ima/ima_policy.c:578 [inline]
ima_match_policy+0x98f/0x19d0 security/integrity/ima/ima_policy.c:712
ima_get_action+0x71/0xa0 security/integrity/ima/ima_api.c:198
process_measurement+0x2da/0x1c20 security/integrity/ima/ima_main.c:228
ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533
do_open fs/namei.c:3618 [inline]
path_openat+0x27cf/0x2fb0 fs/namei.c:3750
do_filp_open+0x1df/0x400 fs/namei.c:3777
do_sys_openat2+0x14b/0x500 fs/open.c:1255
do_sys_open fs/open.c:1271 [inline]
__do_sys_openat fs/open.c:1287 [inline]
__se_sys_openat fs/open.c:1282 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1282
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f31a3a4e0ba
RSP: 002b:00007ffc7f11e958 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffc7f11e9d0 RCX: 00007f31a3a4e0ba
RDX: 0000000000080000 RSI: 00007ffc7f11e9d0 RDI: 00000000ffffff9c
RBP: 00007ffc7f11e9c0 R08: 00007ffc7f11ebc7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000011
R13: 00007f31a3a2a000 R14: 00007ffc7f11ebe0 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 9842 jiffies! g40785 f0x0 RCU_GP_DOING_FQS(6) ->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:27088 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571
preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6596
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
_raw_spin_unlock_irqrestore+0x10d/0x120 kernel/locking/spinlock.c:194
force_qs_rnp kernel/rcu/tree.c:-1 [inline]
rcu_gp_fqs kernel/rcu/tree.c:-1 [inline]
rcu_gp_fqs_loop+0x6e1/0x11f0 kernel/rcu/tree.c:1986
rcu_gp_kthread+0x9a/0x370 kernel/rcu/tree.c:2145
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
rcu_check_gp_kthread_starvation+0x1cd/0x250 kernel/rcu/tree_stall.h:487
print_other_cpu_stall+0x1110/0x1270 kernel/rcu/tree_stall.h:592
check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
rcu_pending kernel/rcu/tree.c:3936 [inline]
rcu_sched_clock_irq+0x845/0x1120 kernel/rcu/tree.c:2619
update_process_times+0x193/0x200 kernel/time/timer.c:2021
tick_sched_handle kernel/time/tick-sched.c:254 [inline]
tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4b0/0xb60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:730
Code: b7 48 89 df e8 36 b7 f4 f7 eb ad e8 df ab f6 ff 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 cc 66 90 0f 00 2d e7 65 5c 00 fb f4 0f 1f 40 00 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 48
RSP: 0018:ffffffff8c007dc8 EFLAGS: 000002c6
RAX: cd8962a24684e700 RBX: ffffffff8c0bc480 RCX: cd8962a24684e700
RDX: 0000000000000001 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4200
RBP: ffffffff8c007ef8 R08: ffff8880b903b30b R09: 1ffff11017207661
R10: dffffc0000000000 R11: ffffed1017207662 R12: 1ffffffff1800fc4
R13: dffffc0000000000 R14: 1ffffffff1817890 R15: 0000000000000000
default_idle_call+0x81/0xc0 kernel/sched/idle.c:112
cpuidle_idle_call kernel/sched/idle.c:202 [inline]
do_idle+0x251/0x650 kernel/sched/idle.c:326
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:424
start_kernel+0x489/0x540 init/main.c:1153
secondary_startup_64_no_verify+0xb1/0xbb