rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10497 ticks this GP) idle=746/1/0x4000000000000000 softirq=77960/77960 fqs=4894 
	(t=10500 jiffies g=127357 q=659)
NMI backtrace for cpu 0
CPU: 0 PID: 9605 Comm: syz-executor.2 Not tainted 5.13.0-rc2-next-20210518-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x13e/0x1d6 lib/dump_stack.c:129
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:342
 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
 rcu_pending kernel/rcu/tree.c:3922 [inline]
 rcu_sched_clock_irq.cold+0x3f1/0x74b kernel/rcu/tree.c:2641
 update_process_times+0x16d/0x200 kernel/time/timer.c:1782
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1420
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
RIP: 0010:rcu_read_unlock_sched_notrace include/linux/rcupdate.h:809 [inline]
RIP: 0010:trace_kmem_cache_alloc_node include/trace/events/kmem.h:109 [inline]
RIP: 0010:kmem_cache_alloc_node+0x362/0x3e0 mm/slub.c:2992
Code: 94 ff 66 66 48 31 c0 e9 16 fd ff ff 65 ff 05 c5 14 47 7e 48 8b 05 9e 13 1b 0c e8 19 59 a6 ff 85 c0 74 26 65 ff 0d ae 14 47 7e <0f> 85 4b fe ff ff e8 92 6a 45 ff e9 41 fe ff ff b9 01 00 00 00 bb
RSP: 0018:ffffc90000007ba8 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000104 RDI: 0000000000000000
RBP: ffff8881445f6000 R08: 0000000000000140 R09: ffff888014fdc640
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000a20
R13: ffff888014fdc640 R14: 00000000ffffffff R15: 0000000000000000
 __alloc_skb+0x20b/0x340 net/core/skbuff.c:413
 alloc_skb include/linux/skbuff.h:1107 [inline]
 mrp_pdu_init net/802/mrp.c:300 [inline]
 mrp_pdu_append_vecattr_event+0x80a/0x10b0 net/802/mrp.c:399
 mrp_attr_event+0x191/0x280 net/802/mrp.c:494
 mrp_mad_event net/802/mrp.c:574 [inline]
 mrp_join_timer+0x5a/0xc0 net/802/mrp.c:591
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
 __run_timers kernel/time/timer.c:1712 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
 __do_softirq+0x29b/0x9fb kernel/softirq.c:559
 invoke_softirq kernel/softirq.c:433 [inline]
 __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:191
Code: 74 24 10 e8 aa 03 3b f8 48 89 ef e8 42 7c 3b f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 13 99 2e f8 65 8b 05 ec 98 e1 76 85 c0 74 0a 5b 5d c3 e8 e0 90
RSP: 0018:ffffc900184e7278 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff1bd3131
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880b9c35880 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817be7f8 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888074058000 R14: ffff8880b9c35700 R15: ffff8880b9c36138
 finish_task_switch.isra.0+0x865/0xb80 kernel/sched/core.c:4591
 context_switch kernel/sched/core.c:4691 [inline]
 __schedule+0xb40/0x58c0 kernel/sched/core.c:5945
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6105
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
 unwind_next_frame+0xee1/0x1ce0 arch/x86/kernel/unwind_orc.c:611
 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free mm/kasan/common.c:363 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:371
 kasan_slab_free include/linux/kasan.h:212 [inline]
 slab_free_hook mm/slub.c:1623 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1648
 slab_free mm/slub.c:3208 [inline]
 kfree+0xeb/0x650 mm/slub.c:4274
 tomoyo_mount_acl+0x54f/0x840 security/tomoyo/mount.c:169
 tomoyo_mount_permission+0x151/0x3f0 security/tomoyo/mount.c:237
 security_sb_mount+0x66/0xc0 security/security.c:962
 path_mount+0x12f/0x1fa0 fs/namespace.c:3177
 do_mount fs/namespace.c:3248 [inline]
 __do_sys_mount fs/namespace.c:3456 [inline]
 __se_sys_mount fs/namespace.c:3433 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433
 do_syscall_64+0x31/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f453e7b1188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 0000000000000000
RBP: 00000000004bfcb9 R08: 0000000020000540 R09: 0000000000000000
R10: 00000000000020a0 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff1f6337ef R14: 00007f453e7b1300 R15: 0000000000022000