rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=956/1/0x4000000000000004 softirq=181782/181782 fqs=4374 
rcu: 	 (t=10500 jiffies g=283241 q=3725)
NMI backtrace for cpu 1
CPU: 1 PID: 16777 Comm: syz-executor.2 Not tainted 4.19.132-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:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682
 update_process_times+0x2a/0x70 kernel/time/timer.c:1638
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:unwind_next_frame+0x1149/0x1c60 arch/x86/kernel/unwind_orc.c:559
Code: 89 f9 41 83 e1 07 45 38 c8 41 0f 9e c1 45 84 c0 41 0f 95 c0 45 84 c1 0f 85 ca 09 00 00 83 e0 07 40 38 c6 41 0f 9e c0 40 84 f6 <0f> 95 c0 41 84 c0 0f 85 b1 09 00 00 48 0f bf 71 02 4c 89 ff 4c 01
RSP: 0018:ffff8880ae707728 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000003 RBX: 1ffff11015ce0eed RCX: ffffffff8a0cfca8
RDX: ffff8880ae707908 RSI: 0000000000000000 RDI: ffffffff8a0cfcaa
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000066061 R11: 0000000000000001 R12: ffff8880ae707958
R13: ffff8880ae7078fd R14: ffff8880ae707900 R15: ffff8880ae7078c8
 __unwind_start+0x56e/0x910 arch/x86/kernel/unwind_orc.c:670
 unwind_start arch/x86/include/asm/unwind.h:60 [inline]
 __save_stack_trace+0x72/0x190 arch/x86/kernel/stacktrace.c:43
 save_stack mm/kasan/kasan.c:448 [inline]
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3689 [inline]
 __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0xae/0x560 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:995 [inline]
 mrp_pdu_init net/802/mrp.c:303 [inline]
 mrp_pdu_append_vecattr_event+0x7d2/0x1050 net/802/mrp.c:402
 mrp_attr_event+0x15d/0x220 net/802/mrp.c:497
 mrp_mad_event net/802/mrp.c:577 [inline]
 mrp_join_timer+0x5a/0xc0 net/802/mrp.c:594
 call_timer_fn+0x177/0x700 kernel/time/timer.c:1326
 expire_timers+0x243/0x4e0 kernel/time/timer.c:1363
 __run_timers kernel/time/timer.c:1684 [inline]
 run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1697
 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x215/0x260 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:544 [inline]
 smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:write_comp_data+0x6c/0x70 kernel/kcov.c:146
Code: 00 00 4e 8d 04 dd 28 00 00 00 4c 39 c6 72 1b 48 83 c7 01 4e 89 54 00 e0 4e 89 4c 00 e8 4a 89 54 00 f0 4a 89 4c d8 20 48 89 38 <c3> 0f 1f 00 48 8b 0c 24 40 0f b6 d6 40 0f b6 f7 31 ff eb 80 48 8b
RSP: 0018:ffff8881a719f840 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000002 RBX: 0000000000000180 RCX: ffffffff835e6b7a
RDX: 0000000000000180 RSI: ffff88808abb0380 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000180
R10: 0000000000000006 R11: 0000000000000000 R12: 0000000000000180
R13: ffff888098614ea8 R14: dffffc0000000000 R15: dffffc0000000000
 _find_next_bit lib/find_bit.c:54 [inline]
 find_next_bit+0x9a/0x130 lib/find_bit.c:74
 ebitmap_next_positive security/selinux/ss/ebitmap.h:71 [inline]
 context_struct_compute_av+0x8c7/0x1320 security/selinux/ss/services.c:664
 security_compute_av+0x3de/0xb40 security/selinux/ss/services.c:1152
 avc_compute_av+0xeb/0x740 security/selinux/avc.c:1007
 avc_has_perm_noaudit security/selinux/avc.c:1150 [inline]
 avc_has_perm+0x3c7/0x410 security/selinux/avc.c:1185
 selinux_shm_alloc_security+0x29d/0x3e0 security/selinux/hooks.c:6224
 security_shm_alloc+0x40/0x90 security/security.c:1237
 newseg+0x2fc/0xdf0 ipc/shm.c:631
 ipcget_new ipc/util.c:315 [inline]
 ipcget+0xe6/0xcd0 ipc/util.c:614
 ksys_shmget ipc/shm.c:742 [inline]
 __do_sys_shmget ipc/shm.c:747 [inline]
 __se_sys_shmget ipc/shm.c:745 [inline]
 __x64_sys_shmget+0x139/0x1a0 ipc/shm.c:745
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fabb18d2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000001d
RAX: ffffffffffffffda RBX: 0000000000509180 RCX: 000000000045cba9
RDX: 0000000054000000 RSI: 0000000000003000 RDI: 0000000000000000
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020ffb000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000bd2 R14: 00000000004ce2c5 R15: 00007fabb18d36d4
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.
IPv6: ADDRCONF(NETDEV_UP): vlan1272: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vlan1238: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vlan983: link is not ready