======================================
| 0
| xx__-> [    8.227957][  T193] ------------[ cut here ]------------
| [    8.228159][  T193] UBSAN: shift-out-of-bounds in kernel/trace/trace.c:10510:10
| [    8.228361][  T193] shift exponent 32 is too large for 32-bit type 'int'
[    8.228520][  T193] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.228522][  T193] Call Trace:
[    8.228524][  T193]  <TASK>
[    8.228525][  T193]  dump_stack_lvl (lib/dump_stack.c:122)
[    8.228533][  T193]  ubsan_epilogue (lib/ubsan.c:234)
[    8.228537][  T193]  __ubsan_handle_shift_out_of_bounds.cold (lib/ubsan.c:494)
[    8.228544][  T193]  __remove_instance.part.0.constprop.0.cold (kernel/trace/trace.c:10509 (discriminator 1))
[    8.228549][  T193]  instance_rmdir (./include/linux/mutex.h:253 kernel/trace/trace.c:10578)
[    8.228554][  T193]  tracefs_syscall_rmdir (./include/linux/fs.h:1072 fs/tracefs/inode.c:168)
[    8.228558][  T193]  vfs_rmdir (fs/namei.c:5236 fs/namei.c:5209)
[    8.228564][  T193]  do_rmdir (fs/namei.c:2888 fs/namei.c:5294)
[    8.228567][  T193]  ? __ia32_sys_mkdir (fs/namei.c:5255)
[    8.228568][  T193]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5536)
[    8.228573][  T193]  ? __might_fault (mm/memory.c:7174 (discriminator 4))
[    8.228580][  T193]  __x64_sys_rmdir (fs/namei.c:5315 (discriminator 2) fs/namei.c:5313 (discriminator 2) fs/namei.c:5313 (discriminator 2))
[    8.228581][  T193]  ? do_syscall_64 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/entry-common.h:108 arch/x86/entry/syscall_64.c:90)
[    8.228585][  T193]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[    8.228588][  T193]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131)
[    8.228590][  T193] RIP: 0033:0x7f760ea5276b
[    8.228594][  T193] Code: f0 ff ff 73 01 c3 48 8b 0d 92 06 10 00 f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 54 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 8b 15 61 06 10 00 f7 d8
All code
========
   0:	f0 ff                	lock (bad)
   2:	ff 73 01             	push   0x1(%rbx)
   5:	c3                   	ret
   6:	48 8b 0d 92 06 10 00 	mov    0x100692(%rip),%rcx        # 0x10069f
   d:	f7 d8                	neg    %eax
   f:	64 89 01             	mov    %eax,%fs:(%rcx)
  12:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  16:	c3                   	ret
  17:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  1e:	00 
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 54 00 00 00       	mov    $0x54,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 05                	ja     0x37
  32:	c3                   	ret
  33:	0f 1f 40 00          	nopl   0x0(%rax)
  37:	48 8b 15 61 06 10 00 	mov    0x100661(%rip),%rdx        # 0x10069f
  3e:	f7 d8                	neg    %eax

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 05                	ja     0xd
   8:	c3                   	ret
   9:	0f 1f 40 00          	nopl   0x0(%rax)
   d:	48 8b 15 61 06 10 00 	mov    0x100661(%rip),%rdx        # 0x100675
  14:	f7 d8                	neg    %eax
[    8.228596][  T193] RSP: 002b:00007ffcf6089e18 EFLAGS: 00000206 ORIG_RAX: 0000000000000054
[    8.228600][  T193] RAX: ffffffffffffffda RBX: 000000003c312380 RCX: 00007f760ea5276b
[    8.228601][  T193] RDX: 0000000000000000 RSI: 00007f760eba3820 RDI: 000000003c312320
[    8.228602][  T193] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000ffffffff
[    8.228603][  T193] R10: 0000000000000000 R11: 0000000000000206 R12: 000000003c312400


Finger prints:
ubsan_epilogue:instance_rmdir:tracefs_syscall_rmdir:vfs_rmdir:do_rmdir