rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=ca0c/1/0x4000000000000000 softirq=70749/70749 fqs=4304
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1391797          0            0
rcu: 	cputime:    16913      35576           65   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=92645 q=1183 ncpus=2)
CPU: 1 PID: 17566 Comm: syz.2.3167 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x60 kernel/kcov.c:216
Code: 48 8b 3d bc 0f 05 0d 48 89 de 5b e9 93 ac 57 00 cc cc cc f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 10 49 7c 7e 65 8b 15 11 49 7c 7e <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00
RSP: 0018:ffffc900001ef8f0 EFLAGS: 00000202
RAX: ffffffff813bc108 RBX: 0000000000000102 RCX: ffff888023b3bc00
RDX: 0000000000000102 RSI: 0000000000000102 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffff888023b3bc00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900001f0ff0
R13: ffffc900001ef9c8 R14: ffffc900001f0ff8 R15: ffffc900001ef9d8
FS:  00007f05ff1c36c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 000000005e901000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000b6e DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x1d38/0x2990 arch/x86/kernel/unwind_orc.c:672
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
 __nf_conntrack_alloc+0x93/0x370 net/netfilter/nf_conntrack_core.c:1604
 init_conntrack+0x166/0xdb0 net/netfilter/nf_conntrack_core.c:1695
 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1815 [inline]
 nf_conntrack_in+0xc29/0x15b0 net/netfilter/nf_conntrack_core.c:1967
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
 nf_hook+0x228/0x390 include/linux/netfilter.h:259
 __ip_local_out+0x4db/0x5f0 net/ipv4/ip_output.c:118
 ip_local_out net/ipv4/ip_output.c:127 [inline]
 __ip_queue_xmit+0xf89/0x1960 net/ipv4/ip_output.c:540
 sctp_packet_transmit+0x23e4/0x2950 net/sctp/output.c:653
 sctp_packet_singleton+0x230/0x330 net/sctp/outqueue.c:783
 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
 sctp_outq_flush+0x4fc/0x3260 net/sctp/outqueue.c:1212
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
 sctp_do_sm+0x53c4/0x5af0 net/sctp/sm_sideeffect.c:1169
 sctp_generate_timeout_event+0x22b/0x360 net/sctp/sm_sideeffect.c:295
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:finish_task_switch+0x267/0x8f0 kernel/sched/core.c:5256
Code: 2e 09 85 c0 0f 84 30 01 00 00 48 85 db 0f 85 4f 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 53 b0 38 09 e8 7e 13 30 00 fb 4c 8b 65 b8 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc9001213f760 EFLAGS: 00000286
RAX: 77bbd67d1b3a6f00 RBX: 0000000000000000 RCX: 77bbd67d1b3a6f00
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1d0660
RBP: ffffc9001213f7b0 R08: ffffffff911eb5ff R09: 1ffffffff223d6bf
R10: dffffc0000000000 R11: fffffbfff223d6c0 R12: ffff888023b3bc00
R13: 1ffff110171e79a9 R14: dffffc0000000000 R15: ffff8880b8f3cd48
 context_switch kernel/sched/core.c:5385 [inline]
 __schedule+0x15b6/0x4660 kernel/sched/core.c:6701
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6868
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6892
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 smp_call_function_single+0x48d/0x5a0 kernel/smp.c:652
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x5bb/0x920 kernel/events/core.c:2950
 __do_sys_perf_event_open kernel/events/core.c:12949 [inline]
 __se_sys_perf_event_open+0x1841/0x1c60 kernel/events/core.c:12601
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f05fe39e019
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:00007f05ff1c3028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f05fe625fa0 RCX: 00007f05fe39e019
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007f05fe43500c R08: 000000000000000a R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f05fe626038 R14: 00007f05fe625fa0 R15: 00007ffdc8c16248
 </TASK>