======================================
| [   20.854291][  T921] softirqs last disabled at (36311): __irq_exit_rcu (kernel/softirq.c:679 kernel/softirq.c:519 kernel/softirq.c:767)
| [   20.854294][  T921] Preemption disabled at:
| [   20.854295][  T921] 0x0
| [   20.854310][  T921] Tainted: [W]=WARN
[   20.854311][  T921] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.854313][  T921] Call Trace:
[   20.854316][  T921]  <TASK>
[   20.854318][  T921]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   20.854326][  T921]  __might_resched.cold (kernel/sched/core.c:9234)
[   20.854333][  T921]  ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3))
[   20.854339][  T921]  ? __kmalloc_noprof (./include/linux/sched/mm.h:317 mm/slub.c:4636 mm/slub.c:4974 mm/slub.c:5413 mm/slub.c:5439)
[   20.854346][  T921]  __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))
[   20.854349][  T921]  ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   20.854359][  T921]  ? 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)
[   20.854363][  T921]  alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   20.854368][  T921]  put_chars (drivers/char/virtio_console.c:1176)
[   20.854373][  T921]  ? __send_to_port (drivers/char/virtio_console.c:654)
[   20.854376][  T921]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4116 (discriminator 3) kernel/rcu/tree.c:4108 (discriminator 3))
[   20.854382][  T921]  ? validate_chain (kernel/locking/lockdep.c:3817 (discriminator 2) kernel/locking/lockdep.c:3837 (discriminator 2) kernel/locking/lockdep.c:3892 (discriminator 2))
[   20.854392][  T921]  hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2))
[   20.854404][  T921]  ? hvc_write (drivers/tty/hvc/hvc_console.c:501)
[   20.854408][  T921]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.854412][  T921]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   20.854419][  T921]  console_emit_next_record (kernel/printk/printk.c:3183)
[   20.854425][  T921]  ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20)
[   20.854427][  T921]  ? console_flush_one_record (./include/linux/rcupdate.h:314 (discriminator 2) ./include/linux/srcu.h:439 (discriminator 2) kernel/printk/printk.c:291 (discriminator 2) kernel/printk/printk.c:3246 (discriminator 2))
[   20.854433][  T921]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.854436][  T921]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   20.854443][  T921]  console_flush_one_record (kernel/printk/printk.c:3268)
[   20.854450][  T921]  ? console_emit_next_record (kernel/printk/printk.c:3150)
[   20.854452][  T921]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.854462][  T921]  console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420)
[   20.854466][  T921]  ? console_flush_one_record (kernel/printk/printk.c:3316)
[   20.854468][  T921]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.854472][  T921]  ? lock_acquire (kernel/locking/lockdep.c:5913)
[   20.854478][  T921]  ? __down_trylock_console_sem (kernel/printk/printk.c:334)
[   20.854481][  T921]  ? vprintk_emit (kernel/printk/printk.c:2478)
[   20.854486][  T921]  vprintk_emit (kernel/printk/printk.c:2479)
[   20.854492][  T921]  ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126))
[   20.854495][  T921]  ? 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)
[   20.854500][  T921]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.854506][  T921]  _printk (kernel/printk/printk.c:2504)
[   20.854511][  T921]  ? snapshot_read.cold (user.c:?)
[   20.854516][  T921]  ? do_raw_spin_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qspinlock.h:112 kernel/locking/spinlock_debug.c:116)
[   20.854520][  T921]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   20.854526][  T921]  ? do_raw_spin_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qspinlock.h:112 kernel/locking/spinlock_debug.c:116)
[   20.854530][  T921]  do_exit.cold (kernel/exit.c:889 (discriminator 4) kernel/exit.c:1043 (discriminator 4))
[   20.854535][  T921]  ? exit_notify (kernel/exit.c:780)
[   20.854538][  T921]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[   20.854542][  T921]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.854549][  T921]  do_group_exit (kernel/exit.c:1151)
[   20.854555][  T921]  __x64_sys_exit_group (kernel/exit.c:1162 kernel/exit.c:1160 kernel/exit.c:1160)
[   20.854559][  T921]  x64_sys_call (./arch/x86/include/generated/asm/syscalls_64.h:232)
[   20.854561][  T921]  do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
[   20.854566][  T921]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[   20.854571][  T921]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   20.854574][  T921] RIP: 0033:0x7f57860721b8
[   20.854577][  T921] Code: Unable to access opcode bytes at 0x7f578607218e.

Code starting with the faulting instruction
===========================================
[   20.854579][  T921] RSP: 002b:00007ffee9ce8fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   20.854582][  T921] RAX: ffffffffffffffda RBX: 00007f57861a2f88 RCX: 00007f57860721b8
[   20.854584][  T921] RDX: 00007f5785fafa48 RSI: ffffffffffffffb0 RDI: 0000000000000000
[   20.854586][  T921] RBP: 00007ffee9ce9000 R08: 0000000000000000 R09: 0000000000000000
[   20.854587][  T921] R10: 00007ffee9ce8e40 R11: 0000000000000246 R12: 0000000000000001


Finger prints:
__irq_exit_rcu:dump_stack_lvl:__kmalloc_noprof:put_chars:hvc_console_print