======================================
| [   10.139023][  T220] softirqs last disabled at (0): 0x0
| [   10.139025][  T220] Preemption disabled at:
| [   10.139025][  T220] vprintk_emit (kernel/printk/printk.c:2471)
| [   10.139035][  T220] Tainted: [W]=WARN
[   10.139036][  T220] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   10.139038][  T220] Call Trace:
[   10.139040][  T220]  <TASK>
[   10.139041][  T220]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   10.139046][  T220]  ? vprintk_emit (kernel/printk/printk.c:2471)
[   10.139048][  T220]  __might_resched.cold (kernel/sched/core.c:9234)
[   10.139051][  T220]  ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3))
[   10.139054][  T220]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   10.139058][  T220]  __kmalloc_noprof (./include/linux/sched/mm.h:322 (discriminator 2) mm/slub.c:4636 (discriminator 2) mm/slub.c:4974 (discriminator 2) mm/slub.c:5413 (discriminator 2) mm/slub.c:5439 (discriminator 2))
[   10.139061][  T220]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   10.139063][  T220]  ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   10.139067][  T220]  ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:58 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[   10.139068][  T220]  alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   10.139070][  T220]  put_chars (drivers/char/virtio_console.c:1176)
[   10.139072][  T220]  ? __send_to_port (drivers/char/virtio_console.c:654)
[   10.139073][  T220]  ? printk_get_next_message (kernel/printk/printk.c:3072)
[   10.139075][  T220]  ? console_prepend_replay (kernel/printk/printk.c:3005)
[   10.139077][  T220]  ? desc_read (./include/linux/instrumented.h:97 ./include/linux/atomic/atomic-instrumented.h:3223 kernel/printk/printk_ringbuffer.c:552)
[   10.139079][  T220]  hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2))
[   10.139083][  T220]  ? hvc_write (drivers/tty/hvc/hvc_console.c:501)
[   10.139084][  T220]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   10.139085][  T220]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   10.139087][  T220]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   10.139088][  T220]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   10.139090][  T220]  console_emit_next_record (kernel/printk/printk.c:3183)
[   10.139092][  T220]  ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20)
[   10.139093][  T220]  ? _prb_read_valid (kernel/printk/printk_ringbuffer.c:1996)
[   10.139095][  T220]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   10.139099][  T220]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   10.139100][  T220]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   10.139102][  T220]  ? console_flush_one_record (kernel/printk/printk.c:3247)
[   10.139103][  T220]  console_flush_one_record (kernel/printk/printk.c:3268)
[   10.139105][  T220]  ? console_emit_next_record (kernel/printk/printk.c:3150)
[   10.139107][  T220]  ? __irq_work_queue_local (./include/linux/instrumented.h:55 ./include/linux/llist.h:242 ./include/linux/llist.h:265 kernel/irq_work.c:107)
[   10.139111][  T220]  console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420)
[   10.139113][  T220]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   10.139114][  T220]  ? console_flush_one_record (kernel/printk/printk.c:3316)
[   10.139115][  T220]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   10.139117][  T220]  ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22))
[   10.139118][  T220]  ? lock_acquire (kernel/locking/lockdep.c:5913)
[   10.139119][  T220]  ? sync_exp_reset_tree_hotplug (kernel/rcu/tree_exp.h:98)
[   10.139121][  T220]  ? __down_trylock_console_sem (kernel/printk/printk.c:334)
[   10.139122][  T220]  ? vprintk_emit (kernel/printk/printk.c:2478)
[   10.139124][  T220]  vprintk_emit (kernel/printk/printk.c:2479)
[   10.139126][  T220]  ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126))
[   10.139128][  T220]  ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22))
[   10.139129][  T220]  ? _copy_from_iter (./include/linux/instrumented.h:146 lib/iov_iter.c:66 ./include/linux/iov_iter.h:30 ./include/linux/iov_iter.h:302 ./include/linux/iov_iter.h:330 lib/iov_iter.c:261 lib/iov_iter.c:272)
[   10.139133][  T220]  devkmsg_emit.constprop.0 (kernel/printk/printk.c:733)
[   10.139136][  T220]  ? vprintk_emit.cold (kernel/printk/printk.c:2449)
[   10.139138][  T220]  ? __kmalloc_noprof (mm/slub.c:5415 mm/slub.c:5439)
[   10.139140][  T220]  ? idr_get_free (??:?)
[   10.139143][  T220]  ? devkmsg_write (./include/linux/slab.h:995 kernel/printk/printk.c:762)
[   10.139145][  T220]  ? _copy_from_iter (./include/linux/instrumented.h:146 lib/iov_iter.c:66 ./include/linux/iov_iter.h:30 ./include/linux/iov_iter.h:302 ./include/linux/iov_iter.h:330 lib/iov_iter.c:261 lib/iov_iter.c:272)
[   10.139147][  T220]  devkmsg_write.cold (kernel/printk/printk.c:796)
[   10.139149][  T220]  ? vprintk_default (kernel/printk/printk.c:2494)
[   10.139150][  T220]  ? handle_pte_fault (mm/memory.c:6558)
[   10.139153][  T220]  ? cp_old_stat (fs/stat.c:406 (discriminator 3))
[   10.139156][  T220]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   10.139158][  T220]  ? do_numa_page.isra.0 (mm/memory.c:6319 (discriminator 1))
[   10.139159][  T220]  ? vprintk_default (kernel/printk/printk.c:2494)
[   10.139161][  T220]  new_sync_write (fs/read_write.c:595)
[   10.139163][  T220]  ? new_sync_read (./include/linux/ioprio.h:41)
[   10.139165][  T220]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   10.139168][  T220]  vfs_write (fs/read_write.c:687)
[   10.139170][  T220]  ksys_write (fs/read_write.c:739)
[   10.139172][  T220]  ? __ia32_sys_read (fs/read_write.c:723)
[   10.139173][  T220]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   10.139175][  T220]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   10.139177][  T220]  do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
[   10.139178][  T220]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[   10.139180][  T220]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   10.139182][  T220] RIP: 0033:0x7f64a9dfd54e
[   10.139184][  T220] Code: 4d 89 d8 e8 b4 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 b4 bd 00 00       	call   0xbdbc
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[   10.139189][  T220] RSP: 002b:00007ffc4298e350 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[   10.139192][  T220] RAX: ffffffffffffffda RBX: 00007f64a9f7e580 RCX: 00007f64a9dfd54e
[   10.139194][  T220] RDX: 0000000000000021 RSI: 0000558e296b5060 RDI: 0000000000000001
[   10.139195][  T220] RBP: 00007ffc4298e360 R08: 0000000000000000 R09: 0000000000000000
[   10.139195][  T220] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000021


Finger prints:
vprintk_emit:dump_stack_lvl:__kmalloc_noprof:put_chars:hvc_console_print