INFO: rcu_preempt self-detected stall on CPU
	1-...: (1 GPs behind) idle=e7a/140000000000002/0 softirq=12417/12420 fqs=2 
	 (t=10500 jiffies g=1830 c=1829 q=1135)
rcu_preempt kthread starved for 10496 jiffies! g1830 c1829 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_preempt     R  running task    29824     8      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
 schedule+0x92/0x1c0 kernel/sched/core.c:3428
 schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1746
 rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255
 kthread+0x319/0x430 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
NMI backtrace for cpu 1
CPU: 1 PID: 7844 Comm: syz-executor.2 Not tainted 4.14.170-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:17 [inline]
 dump_stack+0x142/0x197 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline]
 rcu_dump_cpu_stacks+0x186/0x1d2 kernel/rcu/tree.c:1396
 print_cpu_stall kernel/rcu/tree.c:1542 [inline]
 check_cpu_stall kernel/rcu/tree.c:1610 [inline]
 __rcu_pending kernel/rcu/tree.c:3390 [inline]
 rcu_pending kernel/rcu/tree.c:3452 [inline]
 rcu_check_callbacks.cold+0x43d/0xd0a kernel/rcu/tree.c:2792
 update_process_times+0x31/0x70 kernel/time/timer.c:1590
 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:165
 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1223
 __run_hrtimer kernel/time/hrtimer.c:1223 [inline]
 __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1287
 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1321
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
 smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100
 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:should_failslab+0x0/0x130 mm/failslab.c:18
RSP: 0018:ffff8880aed07ba8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: 0000000001080020 RCX: 1ffff1100aef41c3
RDX: 0000000000000000 RSI: 0000000001080020 RDI: ffff8880a9e19900
RBP: ffff8880aed07c18 R08: 0000000001080020 R09: ffff8880577a0e18
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880a9e19900 R14: 0000000000000000 R15: 0000000001080020
 __build_skb+0x35/0x2e0 net/core/skbuff.c:281
 __netdev_alloc_skb+0x289/0x440 net/core/skbuff.c:426
 netdev_alloc_skb include/linux/skbuff.h:2648 [inline]
 dev_alloc_skb include/linux/skbuff.h:2661 [inline]
 send_hsr_supervision_frame+0x110/0xf40 net/hsr/hsr_device.c:265
 hsr_announce+0xf5/0x340 net/hsr/hsr_device.c:350
 call_timer_fn+0x161/0x670 kernel/time/timer.c:1279
 expire_timers kernel/time/timer.c:1318 [inline]
 __run_timers kernel/time/timer.c:1636 [inline]
 __run_timers kernel/time/timer.c:1604 [inline]
 run_timer_softirq+0x5b7/0x1520 kernel/time/timer.c:1649
 __do_softirq+0x244/0x9a0 kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x160/0x1b0 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x41/0x60 kernel/kcov.c:87
RSP: 0018:ffff8880577af9a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 0000000000040000 RBX: ffff8880577afbd8 RCX: ffffc90009841000
RDX: 0000000000009f10 RSI: ffffffff82d4b7bf RDI: ffff88809a245708
RBP: ffff8880577af9a8 R08: 1ffff1100aef5f7b R09: ffff8880577afbd8
R10: ffffed100aef5f7c R11: ffff8880577afbe7 R12: ffff88809a245708
R13: ffff88809a245780 R14: ffff8880577afbac R15: 0000000000000343
 ebitmap_contains+0x1f/0x380 security/selinux/ss/ebitmap.c:206
 mls_level_isvalid+0x14a/0x1b0 security/selinux/ss/mls.c:177
 mls_range_isvalid+0x49/0xd0 security/selinux/ss/mls.c:184
 mls_context_isvalid+0x69/0x2d0 security/selinux/ss/mls.c:199
 policydb_context_isvalid+0x2b4/0x360 security/selinux/ss/policydb.c:990
 security_compute_sid.part.0+0xaaa/0x10f0 security/selinux/ss/services.c:1731
 security_compute_sid security/selinux/ss/services.c:1764 [inline]
 security_transition_sid+0xd6/0x130 security/selinux/ss/services.c:1764
 selinux_determine_inode_label security/selinux/hooks.c:1900 [inline]
 selinux_determine_inode_label+0x237/0x340 security/selinux/hooks.c:1885
 may_create+0x2c6/0x420 security/selinux/hooks.c:1933
 selinux_inode_mkdir+0x23/0x30 security/selinux/hooks.c:3009
 security_inode_mkdir+0xc4/0x110 security/security.c:642
 vfs_mkdir+0x329/0x610 fs/namei.c:3842
 SYSC_mkdirat fs/namei.c:3872 [inline]
 SyS_mkdirat+0x1c2/0x210 fs/namei.c:3856
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b3b9
RSP: 002b:00007f001682bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f001682c6d4 RCX: 000000000045b3b9
RDX: 00000000000001ff RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000072b R14: 00000000004c8a56 R15: 000000000075bf2c
INFO: rcu_sched detected stalls on CPUs/tasks:
	(detected by 1, t=10565 jiffies, g=1238, c=1237, q=2)
All QSes seen, last rcu_sched kthread activity 10561 (4294962940-4294952379), jiffies_till_next_fqs=1, root ->qsmask 0x0
swapper/1       R  running task    30712     0      1 0x80000000
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5168 [inline]
 sched_show_task.cold+0x2f0/0x351 kernel/sched/core.c:5143
 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline]
 check_cpu_stall kernel/rcu/tree.c:1616 [inline]
 __rcu_pending kernel/rcu/tree.c:3390 [inline]
 rcu_pending kernel/rcu/tree.c:3452 [inline]
 rcu_check_callbacks.cold+0xcb1/0xd0a kernel/rcu/tree.c:2792
 update_process_times+0x31/0x70 kernel/time/timer.c:1590
 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:165
 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1223
 __run_hrtimer kernel/time/hrtimer.c:1223 [inline]
 __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1287
 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1321
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
 smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100
 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
RSP: 0018:ffff8880a9d37e70 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fe2ce4 RBX: ffff8880a9d2a340 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880a9d2abbc
RBP: ffff8880a9d37e98 R08: 1ffffffff1164201 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87f16710
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880a9d2a340
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:557
 default_idle_call+0x36/0x90 kernel/sched/idle.c:98
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x262/0x3d0 kernel/sched/idle.c:246
 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:351
 start_secondary+0x346/0x4b0 arch/x86/kernel/smpboot.c:272
 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
rcu_sched kthread starved for 10561 jiffies! g1238 c1237 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_sched       R  running task    29776     9      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
 schedule+0x92/0x1c0 kernel/sched/core.c:3428
 schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1746
 rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255
 kthread+0x319/0x430 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404