rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=ade/1/0x4000000000000004 softirq=68203/68205 fqs=5248 
	(t=10502 jiffies g=110597 q=1055)
NMI backtrace for cpu 1
CPU: 1 PID: 14706 Comm: udevd Not tainted 5.3.0-rc7+ #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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2736 [inline]
 rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1106 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1131
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
RIP: 0010:__sanitizer_cov_trace_cmp4+0x16/0x20 kernel/kcov.c:164
Code: 48 89 e5 48 8b 4d 08 e8 58 ff ff ff 5d c3 66 0f 1f 44 00 00 55 89 f2 89 fe bf 04 00 00 00 48 89 e5 48 8b 4d 08 e8 3a ff ff ff <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48 89 fe bf 06 00 00 00
RSP: 0018:ffff8880ae909c78 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000302 RBX: dffffc0000000000 RCX: ffffffff866bdc86
RDX: 00000000fffff034 RSI: 0000000000000000 RDI: 0000000000000004
RBP: ffff8880ae909c78 R08: ffff8880963b6680 R09: ffffed1015d2137f
R10: ffffed1015d2137e R11: 0000000000000003 R12: ffff88809619b400
R13: 00000000fffff034 R14: ffff88809be35500 R15: 0000000000000000
 rose_find_socket+0xb6/0x120 net/rose/af_rose.c:281
 rose_loopback_timer+0x336/0x480 net/rose/rose_loopback.c:91
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322
 expire_timers kernel/time/timer.c:1366 [inline]
 __run_timers kernel/time/timer.c:1685 [inline]
 __run_timers kernel/time/timer.c:1653 [inline]
 run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1133
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs+0x7/0xb0 kernel/rcu/tree.c:298
Code: 00 00 00 55 48 89 e5 e8 47 ac ff ff 65 48 8b 3c 25 40 fe 01 00 e8 e9 bc ff ff 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 41 54 53 <48> c7 c3 c0 65 03 00 48 83 ec 08 e8 19 0c de 01 48 ba 00 00 00 00
RSP: 0018:ffff8880662afb50 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffff88808ee287c0 RCX: 1ffffffff138bb26
RDX: 0000000000000000 RSI: ffffffff830bbe77 RDI: ffff8880963b6f0c
RBP: ffff8880662afb60 R08: ffff8880963b6680 R09: ffffed1015d26cd4
R10: ffffed1015d26cd3 R11: ffff8880ae93669b R12: ffff88821bc92bb0
R13: ffff88808a080410 R14: ffff88821bc92bb0 R15: 0000000000000000
 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:894
 rcu_read_lock_held+0x81/0xd0 kernel/rcu/update.c:266
 aa_file_perm+0x50c/0xeb0 security/apparmor/file.c:610
 common_file_perm+0x167/0x720 security/apparmor/lsm.c:455
 apparmor_file_permission+0x25/0x30 security/apparmor/lsm.c:468
 security_file_permission+0x79/0x380 security/security.c:1335
 rw_verify_area+0x11e/0x360 fs/read_write.c:399
 vfs_read+0x146/0x440 fs/read_write.c:457
 ksys_read+0x14f/0x290 fs/read_write.c:587
 __do_sys_read fs/read_write.c:597 [inline]
 __se_sys_read fs/read_write.c:595 [inline]
 __x64_sys_read+0x73/0xb0 fs/read_write.c:595
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fd35a93c310
Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24
RSP: 002b:00007ffdf0233138 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000021482d0 RCX: 00007fd35a93c310
RDX: 0000000000001000 RSI: 00007fd35b23b000 RDI: 0000000000000005
RBP: 0000000000003fff R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 000000000000000a
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffdf0233600