rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (0 ticks this GP) idle=cd9c/1/0x4000000000000000 softirq=85376/85376 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5902/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=63525, q=237 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14340 Comm: syz.8.1557 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lookup_object lib/debugobjects.c:421 [inline]
RIP: 0010:debug_object_deactivate+0x9e/0x250 lib/debugobjects.c:875
Code: c8 48 c1 e9 2f 83 e1 f8 4c 8d 3c c9 49 81 c7 20 18 98 99 48 8d 1c c9 48 81 c3 28 18 98 99 48 89 df e8 c6 45 b6 06 48 89 04 24 <4c> 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 5d c9 92 fd 4d
RSP: 0018:ffffc90000a08ca8 EFLAGS: 00000046
RAX: 0000000000000012 RBX: ffffffff99a1a708 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000a08b80
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000141170 R12: ffff888043ae2340
R13: dffffc0000000000 R14: 1883fd1e90000000 R15: ffffffff99a1a700
FS: 00007f1c17ef36c0(0000) GS:ffff888126238000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2495a9f000 CR3: 00000000645c6000 CR4: 0000000000350ef0
Call Trace:
<IRQ>
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
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:mpihelp_submul_1+0x7c/0x1a0 lib/crypto/mpi/generic_mpih-mul3.c:36
Code: 89 5c 24 04 48 63 cb 48 8b 44 24 20 48 89 4c 24 28 4c 8d 34 c8 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 f7 e8 6a f6 94 fd 49 8b 06 41 89 c5 48 89 c5 48 c1 ed
RSP: 0018:ffffc9000406f5c0 EFLAGS: 00000246
RAX: 1ffff1100f0db64a RBX: 00000000fffffff0 RCX: dffffc0000000000
RDX: ffffc9000e7c1000 RSI: 0000000000052c66 RDI: 0000000000052c67
RBP: 0000000000000000 R08: ffff888043263c80 R09: 0000000000000003
R10: 0000000000000002 R11: 0000000000000002 R12: 0000000000000000
R13: ffff88806858a490 R14: ffff8880786db250 R15: 1ffff1100d0b1492
mpihelp_divrem+0x1074/0x1170 lib/crypto/mpi/mpih-div.c:353
mpi_powm+0x13de/0x23c0 lib/crypto/mpi/mpi-pow.c:206
_compute_val crypto/dh.c:39 [inline]
dh_compute_value+0x1cf/0x380 crypto/dh.c:196
crypto_kpp_generate_public_key include/crypto/kpp.h:313 [inline]
__keyctl_dh_compute+0x7f1/0xca0 security/keys/dh.c:261
keyctl_dh_compute+0x109/0x160 security/keys/dh.c:-1
__do_sys_keyctl security/keys/keyctl.c:1978 [inline]
__se_sys_keyctl+0x423/0x910 security/keys/keyctl.c:1874
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: 0033:0x7f1c16f8f749
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:00007f1c17ef3038 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa
RAX: ffffffffffffffda RBX: 00007f1c171e5fa0 RCX: 00007f1c16f8f749
RDX: 0000200000001cc0 RSI: 0000200000000040 RDI: 0000000000000017
RBP: 00007f1c17013f91 R08: 00002000000000c0 R09: 0000000000000000
R10: 00000000000000c2 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1c171e6038 R14: 00007f1c171e5fa0 R15: 00007fff2188d828
</TASK>
task:kworker/1:4 state:R running task stack:21000 pid:5902 tgid:5902 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient gc_worker
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:seqcount_lockdep_reader_access+0x17e/0x1c0 include/linux/seqlock.h:75
Code: f8 4d 85 e4 75 16 e8 51 15 4e f8 eb 15 e8 4a 15 4e f8 e8 a5 c3 d4 01 4d 85 e4 74 ea e8 3b 15 4e f8 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc90004c8f840 EFLAGS: 00000293
RAX: ffffffff8971ee75 RBX: 0000000000000000 RCX: ffff888033531e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004c8f8f0 R08: ffffffff8f7cf777 R09: 1ffffffff1ef9eee
R10: dffffc0000000000 R11: fffffbfff1ef9eef R12: 0000000000000200
R13: ffff8880555b2018 R14: 1ffff92000991f08 R15: dffffc0000000000
nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:342 [inline]
gc_worker+0x308/0x1380 net/netfilter/nf_conntrack_core.c:1548
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
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
</TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g63525 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=58010
rcu: rcu_preempt kthread starved for 10502 jiffies! g63525 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26464 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
<TASK>
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
</TASK>