rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=e09c/1/0x4000000000000000 softirq=71000/71005 fqs=5234
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1420634          0            0
rcu: 	cputime:    17831      34667           38   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=92861 q=1570 ncpus=2)
CPU: 0 PID: 18010 Comm: syz.3.3686 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:unwind_next_frame+0x71/0x2970 arch/x86/kernel/unwind_orc.c:470
Code: 48 89 5c 24 20 4d 8b 7c 24 48 4d 8d 74 24 38 4c 89 f0 48 c1 e8 03 48 89 44 24 68 42 80 3c 28 00 74 08 4c 89 f7 e8 bf 14 a4 00 <49> 8b 44 24 38 48 89 84 24 90 00 00 00 4c 89 e3 48 c1 eb 03 42 0f
RSP: 0018:ffffc90000007418 EFLAGS: 00000246
RAX: 1ffff92000000ea4 RBX: ffffc90000007530 RCX: ffff888021483c00
RDX: 0000000000000100 RSI: ffffffff8176bf92 RDI: ffffc900000074e8
RBP: ffffc90000007570 R08: ffffc900000075b0 R09: 0000000000000008
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900000074e8
R13: dffffc0000000000 R14: ffffc90000007520 R15: ffffffff8176bf92
FS:  00007f7b888276c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 00000000663e2000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc+0xb4/0x230 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 switchdev_deferred_enqueue+0x2d/0x240 net/switchdev/switchdev.c:117
 br_switchdev_host_mdb_one net/bridge/br_switchdev.c:565 [inline]
 br_switchdev_host_mdb net/bridge/br_switchdev.c:577 [inline]
 br_switchdev_mdb_notify+0x40a/0x860 net/bridge/br_switchdev.c:652
 br_mdb_notify+0x68/0x960 net/bridge/br_mdb.c:519
 br_multicast_host_leave net/bridge/br_multicast.c:1497 [inline]
 br_multicast_group_expired+0x300/0x5e0 net/bridge/br_multicast.c:655
 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:generic_exec_single+0x481/0x4f0 kernel/smp.c:418
Code: 75 11 e8 72 03 0b 00 48 85 db 75 16 e8 68 03 0b 00 eb 15 e8 61 03 0b 00 e8 3c fb 08 09 48 85 db 74 ea e8 52 03 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 43 c7 44 2c 08
RSP: 0018:ffffc900052f7a00 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000080000
RDX: ffffc9000db3d000 RSI: 00000000000028db RDI: 00000000000028dc
RBP: ffffc900052f7ad0 R08: ffffffff911c15ff R09: 1ffffffff22382bf
R10: dffffc0000000000 R11: fffffbfff22382c0 R12: 1ffff92000a5ef44
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000a5ef65
 smp_call_function_single+0x36d/0x5a0 kernel/smp.c:647
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x5be/0x920 kernel/events/core.c:2948
 __do_sys_perf_event_open kernel/events/core.c:12915 [inline]
 __se_sys_perf_event_open+0x1836/0x1c50 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: 0033:0x7f7b8799c799
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:00007f7b88827028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f7b87c15fa0 RCX: 00007f7b8799c799
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007f7b87a32c99 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b87c16038 R14: 00007f7b87c15fa0 R15: 00007ffd09ceef78
 </TASK>