======================================
| [  792.837909][    C2] RCU nest depth: 1, expected: 0
| [  792.838060][    C2] INFO: lockdep is turned off.
| [  792.838211][    C2] Preemption disabled at:
| [  792.838213][    C2] handle_softirqs (kernel/softirq.c:463 (discriminator 1) kernel/softirq.c:598 (discriminator 1))
[  792.838508][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  792.838510][    C2] Call Trace:
[  792.838512][    C2]  <IRQ>
[  792.838513][    C2]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  792.838520][    C2]  ? handle_softirqs (kernel/softirq.c:463 (discriminator 1) kernel/softirq.c:598 (discriminator 1))
[  792.838522][    C2]  __might_resched.cold (kernel/sched/core.c:9163)
[  792.838525][    C2]  ? arch_stack_walk (arch/x86/kernel/stacktrace.c:25)
[  792.838528][    C2]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[  792.838531][    C2]  ? kasan_save_free_info (mm/kasan/generic.c:584)
[  792.838534][    C2]  ? kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6378)
[  792.838537][    C2]  ? unlink_anon_vmas (mm/rmap.c:147 mm/rmap.c:539)
[  792.838540][    C2]  ? free_pgtables (mm/memory.c:414)
[  792.838543][    C2]  __mutex_lock (kernel/locking/mutex.c:623 kernel/locking/mutex.c:820)
[  792.838547][    C2]  ? x64_sys_call (./arch/x86/include/generated/asm/syscalls_64.h:232)
[  792.838548][    C2]  ? do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  792.838550][    C2]  ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  792.838552][    C2]  ? __tcf_chain_put (net/sched/cls_api.c:694)
[  792.838556][    C2]  ? ww_mutex_lock (kernel/locking/mutex.c:933)
[  792.838559][    C2]  ? __tcf_chain_put (net/sched/cls_api.c:694)
[  792.838561][    C2]  __tcf_chain_put (net/sched/cls_api.c:694)
[  792.838562][    C2]  ? free_percpu.part.0 (./include/linux/spinlock.h:408 (discriminator 3) mm/percpu.c:2283 (discriminator 3))
[  792.838565][    C2]  tcf_action_rcu_free (net/sched/act_api.c:130 net/sched/act_api.c:370 net/sched/act_api.c:378)
[  792.838567][    C2]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[  792.838570][    C2]  rcu_do_batch (kernel/rcu/tree.c:2617)
[  792.838573][    C2]  ? trace_rcu_batch_end (./include/trace/events/rcu.h:714 (discriminator 19))
[  792.838575][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  792.838576][    C2]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  792.838579][    C2]  ? trace_irq_disable.constprop.0 (./include/trace/events/preemptirq.h:36 (discriminator 22))
[  792.838582][    C2]  rcu_core (kernel/rcu/tree.c:2869)
[  792.838583][    C2]  handle_softirqs (kernel/softirq.c:622)
[  792.838585][    C2]  ? clockevents_tick_resume (kernel/time/clockevents.c:193)
[  792.838587][    C2]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[  792.838589][    C2]  ? lock_release (./include/trace/events/lock.h:69 (discriminator 22) kernel/locking/lockdep.c:5879 (discriminator 22))
[  792.838592][    C2]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[  792.838593][    C2]  irq_exit_rcu (kernel/softirq.c:752)
[  792.838594][    C2]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[  792.838597][    C2]  </IRQ>
[  792.838597][    C2]  <TASK>
[  792.838598][    C2]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[  792.838600][    C2] RIP: 0010:__orc_find (arch/x86/kernel/unwind_orc.c:81 arch/x86/kernel/unwind_orc.c:103)
[  792.838603][    C2] Code: 39 c1 72 4d 4c 89 ca 4c 29 c2 48 89 d1 48 c1 ea 3f 48 c1 f9 02 48 01 ca 48 d1 fa 49 8d 14 90 48 89 d1 48 c1 e9 03 0f b6 3c 01 <48> 89 d1 83 e1 07 83 c1 03 40 38 f9 7c 05 40 84 ff 75 30 48 63 0a
All code
========
   0:	39 c1                	cmp    %eax,%ecx
   2:	72 4d                	jb     0x51
   4:	4c 89 ca             	mov    %r9,%rdx
   7:	4c 29 c2             	sub    %r8,%rdx
   a:	48 89 d1             	mov    %rdx,%rcx
   d:	48 c1 ea 3f          	shr    $0x3f,%rdx
  11:	48 c1 f9 02          	sar    $0x2,%rcx
  15:	48 01 ca             	add    %rcx,%rdx
  18:	48 d1 fa             	sar    $1,%rdx
  1b:	49 8d 14 90          	lea    (%r8,%rdx,4),%rdx
  1f:	48 89 d1             	mov    %rdx,%rcx
  22:	48 c1 e9 03          	shr    $0x3,%rcx
  26:	0f b6 3c 01          	movzbl (%rcx,%rax,1),%edi
  2a:*	48 89 d1             	mov    %rdx,%rcx		<-- trapping instruction
  2d:	83 e1 07             	and    $0x7,%ecx
  30:	83 c1 03             	add    $0x3,%ecx
  33:	40 38 f9             	cmp    %dil,%cl
  36:	7c 05                	jl     0x3d
  38:	40 84 ff             	test   %dil,%dil
  3b:	75 30                	jne    0x6d
  3d:	48 63 0a             	movslq (%rdx),%rcx

Code starting with the faulting instruction
===========================================
   0:	48 89 d1             	mov    %rdx,%rcx
   3:	83 e1 07             	and    $0x7,%ecx
   6:	83 c1 03             	add    $0x3,%ecx
   9:	40 38 f9             	cmp    %dil,%cl
   c:	7c 05                	jl     0x13
   e:	40 84 ff             	test   %dil,%dil
  11:	75 30                	jne    0x43
  13:	48 63 0a             	movslq (%rdx),%rcx
[  792.838604][    C2] RSP: 0018:ffa00000005374c0 EFLAGS: 00000212
[  792.838608][    C2] RAX: dffffc0000000000 RBX: ffffffff8c718fae RCX: 1ffffffff189f6df
[  792.838609][    C2] RDX: ffffffff8c4fb6f8 RSI: ffffffff8c4fb6e0 RDI: 0000000000000000
[  792.838610][    C2] RBP: 0000000000000001 R08: ffffffff8c4fb6e0 R09: ffffffff8c4fb710
[  792.838611][    C2] R10: ffffffff88a20c12 R11: ffffffff8c4fb6e0 R12: ffa0000000537658
[  792.838611][    C2] R13: ffa0000000537600 R14: ff1100000c7a2340 R15: ffffffff8904fdf2
[  792.838612][    C2]  ? unlink_anon_vmas (mm/rmap.c:147 mm/rmap.c:539)
[  792.838614][    C2]  ? stack_trace_save (kernel/stacktrace.c:122 (discriminator 1))
[  792.838618][    C2]  ? unlink_anon_vmas (mm/rmap.c:147 mm/rmap.c:539)
[  792.838620][    C2]  unwind_next_frame (arch/x86/kernel/unwind_orc.c:217 arch/x86/kernel/unwind_orc.c:510)
[  792.838621][    C2]  ? stack_trace_save (kernel/stacktrace.c:122 (discriminator 1))
[  792.838623][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  792.838625][    C2]  ? stack_access_ok (./arch/x86/include/asm/stacktrace.h:55)
[  792.838626][    C2]  ? lock_release (./include/trace/events/lock.h:69 (discriminator 22) kernel/locking/lockdep.c:5879 (discriminator 22))
[  792.838628][    C2]  ? __unwind_start (arch/x86/kernel/unwind_orc.c:787)
[  792.838629][    C2]  ? write_profile (profile.c:?)
[  792.838631][    C2]  arch_stack_walk (arch/x86/kernel/stacktrace.c:25)
[  792.838633][    C2]  ? stack_trace_save (kernel/stacktrace.c:122 (discriminator 1))
[  792.838635][    C2]  stack_trace_save (kernel/stacktrace.c:122 (discriminator 1))
[  792.838637][    C2]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[  792.838640][    C2]  ? unlink_anon_vmas (mm/rmap.c:147 mm/rmap.c:539)
[  792.838641][    C2]  ? kasan_save_stack (mm/kasan/common.c:58)
[  792.838643][    C2]  kasan_save_stack (mm/kasan/common.c:57)
[  792.838649][    C2]  kasan_save_track (mm/kasan/common.c:78)
[  792.838651][    C2]  kasan_save_free_info (mm/kasan/generic.c:584)
[  792.838652][    C2]  __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285)
[  792.838654][    C2]  kmem_cache_free (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6378)
[  792.838657][    C2]  unlink_anon_vmas (mm/rmap.c:147 mm/rmap.c:539)
[  792.838659][    C2]  free_pgtables (mm/memory.c:414)
[  792.838660][    C2]  ? zap_vma_for_reaping (mm/memory.c:2143)
[  792.838662][    C2]  ? free_pgd_range (mm/memory.c:351)
[  792.838664][    C2]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[  792.838666][    C2]  ? rwsem_down_write_slowpath (./include/linux/list.h:159)
[  792.838667][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  792.838669][    C2]  exit_mmap (mm/mmap.c:1312)
[  792.838671][    C2]  ? vm_brk_flags (./include/linux/seqlock.h:453)
[  792.838673][    C2]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[  792.838674][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  792.838676][    C2]  ? __mutex_lock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.c:89 kernel/locking/mutex.c:134 kernel/locking/mutex.c:649 kernel/locking/mutex.c:820)
[  792.838677][    C2]  ? __mutex_lock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.c:89 kernel/locking/mutex.c:134 kernel/locking/mutex.c:649 kernel/locking/mutex.c:820)
[  792.838678][    C2]  ? uprobe_clear_state (kernel/events/uprobes.c:1824)
[  792.838682][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  792.838683][    C2]  ? __mutex_unlock_slowpath (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:4480 kernel/locking/mutex.c:1007)
[  792.838686][    C2]  mmput (kernel/fork.c:1178 kernel/fork.c:1201)
[  792.838688][    C2]  exit_mm (kernel/exit.c:582)
[  792.838690][    C2]  ? unwind_deferred_task_exit (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/unwind/deferred.c:56 kernel/unwind/deferred.c:196)
[  792.838692][    C2]  do_exit (kernel/exit.c:964)
[  792.838694][    C2]  ? exit_notify (kernel/exit.c:748)
[  792.838696][    C2]  ? posixtimer_sig_unignore.isra.0 (kernel/signal.c:1969 (discriminator 3))
[  792.838698][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  792.838700][    C2]  do_group_exit (kernel/exit.c:1119)
[  792.838701][    C2]  __x64_sys_exit_group (kernel/exit.c:1130 kernel/exit.c:1128 kernel/exit.c:1128)
[  792.838702][    C2]  x64_sys_call (./arch/x86/include/generated/asm/syscalls_64.h:232)
[  792.838704][    C2]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  792.838705][    C2]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[  792.838707][    C2]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[  792.838708][    C2]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  792.838710][    C2] RIP: 0033:0x7fabe81132b8
[  792.838712][    C2] Code: Unable to access opcode bytes at 0x7fabe811328e.

Code starting with the faulting instruction
===========================================
[  792.838713][    C2] RSP: 002b:00007ffe35970248 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[  792.838714][    C2] RAX: ffffffffffffffda RBX: 00007fabe8244f88 RCX: 00007fabe81132b8
[  792.838715][    C2] RDX: 00007fabe8050e88 RSI: ffffffffffffffb0 RDI: 0000000000000000
[  792.838716][    C2] RBP: 00007ffe359702a0 R08: 0000000000000000 R09: 0000000000000030
[  792.838717][    C2] R10: 00007ffe359700e0 R11: 0000000000000246 R12: 0000000000000001


Finger prints:
handle_softirqs:dump_stack_lvl:__mutex_lock:__tcf_chain_put:tcf_action_rcu_free