rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=5854/1/0x4000000000000000 softirq=74722/74723 fqs=5180
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1275560          0            0
rcu: 	cputime:    15402      37087           74   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=103825 q=2501 ncpus=2)
CPU: 0 PID: 19319 Comm: syz.1.3665 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x8e/0x120 kernel/kcov.c:350
Code: ae 00 00 00 41 57 41 56 41 54 53 48 8b 54 24 20 65 4c 8b 05 74 9b 7c 7e 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 <65> 44 8b 1d 62 9b 7c 7e 41 81 e3 00 01 ff 00 74 13 41 81 fb 00 01
RSP: 0018:ffffc90000007430 EFLAGS: 00000202
RAX: 0000000000000008 RBX: 0000000000000000 RCX: 0000000000000003
RDX: ffffffff813b3d62 RSI: ffffffff8cfa0760 RDI: 0000000000000005
RBP: ffffc90000007578 R08: ffff888078a65a00 R09: 0000000000000006
R10: 0000000000000008 R11: 0000000000000100 R12: ffffc90000007528
R13: dffffc0000000000 R14: 0000000000000005 R15: ffffffff8f1977ce
FS:  00007f9c3d9ab6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70513577b0 CR3: 0000000069c92000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x742/0x2970 arch/x86/kernel/unwind_orc.c:515
 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_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1811 [inline]
 slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 kmem_cache_free+0xf8/0x270 mm/slub.c:3852
 netlink_broadcast_filtered+0x101c/0x1110 net/netlink/af_netlink.c:1538
 netlink_broadcast net/netlink/af_netlink.c:1560 [inline]
 nlmsg_multicast include/net/netlink.h:1090 [inline]
 nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2588
 br_multicast_del_pg+0x4b7/0xee0 net/bridge/br_multicast.c:816
 br_multicast_port_group_expired+0x5ce/0x710 net/bridge/br_multicast.c:879
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 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:lock_is_held_type+0x13e/0x190 kernel/locking/lockdep.c:5830
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000c65f938 EFLAGS: 00000206
RAX: 3713749e9f299500 RBX: ffff888078a65a00 RCX: 3713749e9f299500
RDX: 0000000000000000 RSI: ffffffff8acada80 RDI: ffffffff8b1c82e0
RBP: 0000000000000000 R08: ffffc9000c65fb1f R09: 0000000000000000
R10: ffffc9000c65fb10 R11: fffff520018cbf64 R12: 0000000000000002
R13: 0000000000000246 R14: ffffffff8d132060 R15: ffff888078a66530
 lock_is_held include/linux/lockdep.h:288 [inline]
 schedule_debug kernel/sched/core.c:5958 [inline]
 __schedule+0x22a/0x45a0 kernel/sched/core.c:6591
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x111/0x120 kernel/locking/spinlock.c:194
 __do_sys_perf_event_open kernel/events/core.c:12916 [inline]
 __se_sys_perf_event_open+0x183e/0x1c50 kernel/events/core.c:12567
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9c3cb9c629
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:00007f9c3d9ab028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f9c3ce16090 RCX: 00007f9c3cb9c629
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f9c3cc32b39 R08: 0000000000000002 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9c3ce16128 R14: 00007f9c3ce16090 R15: 00007ffc55676798
 </TASK>