[  355.900634][    C3] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:623
[  355.900830][    C3] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3719, name: perl
[  355.900955][    C3] preempt_count: 101, expected: 0
[  355.901040][    C3] RCU nest depth: 0, expected: 0
[  355.901124][    C3] INFO: lockdep is turned off.
[  355.901212][    C3] Preemption disabled at:
[  355.901213][    C3] [<0000000000000000>] 0x0
[  355.901359][    C3] CPU: 3 UID: 0 PID: 3719 Comm: perl Not tainted 7.1.0-rc5-virtme #1 PREEMPT(full) 
[  355.901362][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  355.901364][    C3] Call Trace:
[  355.901366][    C3]  <IRQ>
[  355.901367][    C3]  dump_stack_lvl+0x6f/0xa0
[  355.901375][    C3]  __might_resched.cold+0x20d/0x2d6
[  355.901379][    C3]  ? process_output_block+0x110/0x760
[  355.901383][    C3]  ? perf_trace_sched_switch+0x7d0/0x7d0
[  355.901387][    C3]  ? new_sync_write+0x333/0x750
[  355.901390][    C3]  ? ksys_write+0x116/0x250
[  355.901392][    C3]  ? do_syscall_64+0x117/0x590
[  355.901394][    C3]  ? entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  355.901397][    C3]  __mutex_lock+0x118/0x2010
[  355.901399][    C3]  ? __tcf_chain_put+0x5f/0xb20
[  355.901403][    C3]  ? ww_mutex_lock+0x160/0x160
[  355.901406][    C3]  ? __tcf_chain_put+0x5f/0xb20
[  355.901408][    C3]  __tcf_chain_put+0x5f/0xb20
[  355.901409][    C3]  ? free_percpu.part.0+0x5f7/0xc80
[  355.901413][    C3]  tcf_action_rcu_free+0x14f/0x1a0
[  355.901414][    C3]  ? rcu_do_batch+0x2b4/0x1020
[  355.901418][    C3]  rcu_do_batch+0x2b6/0x1020
[  355.901420][    C3]  ? rcu_is_watching+0x15/0xd0
[  355.901422][    C3]  ? sched_balance_softirq+0x260/0x320
[  355.901425][    C3]  ? trace_rcu_batch_end+0x330/0x330
[  355.901426][    C3]  ? sched_balance_domains+0xcd0/0xcd0
[  355.901428][    C3]  ? rcu_is_watching+0x15/0xd0
[  355.901430][    C3]  ? trace_irq_enable.constprop.0+0x9b/0x180
[  355.901433][    C3]  ? trace_irq_disable.constprop.0+0x9b/0x180
[  355.901435][    C3]  rcu_core+0x2bf/0x640
[  355.901436][    C3]  handle_softirqs+0x1d8/0x940
[  355.901439][    C3]  ? clockevents_tick_resume+0x60/0x60
[  355.901442][    C3]  ? _local_bh_enable+0xd0/0xd0
[  355.901444][    C3]  ? lock_release+0x17c/0x1f0
[  355.901446][    C3]  __irq_exit_rcu+0x103/0x1c0
[  355.901447][    C3]  irq_exit_rcu+0xe/0x30
[  355.901449][    C3]  sysvec_apic_timer_interrupt+0x9d/0xe0
[  355.901451][    C3]  </IRQ>
[  355.901452][    C3]  <TASK>
[  355.901453][    C3]  asm_sysvec_apic_timer_interrupt+0x1a/0x20
[  355.901457][    C3] RIP: 0010:_raw_spin_unlock_irqrestore+0x36/0x80
[  355.901460][    C3] Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 21 7e ca fd 48 89 df e8 a9 d4 ca fd f7 c5 00 02 00 00 75 1f 9c 58 f6 c4 02 75 2f <bf> 01 00 00 00 e8 30 62 bd fd 65 8b 05 29 0a fe 01 85 c0 74 12 5b
[  355.901462][    C3] RSP: 0018:ffa0000002c3fa78 EFLAGS: 00000246
[  355.901465][    C3] RAX: 0000000000000046 RBX: ffffffff9d1137a0 RCX: 0000000000000000
[  355.901466][    C3] RDX: 0000000000000003 RSI: ffffffff9986f640 RDI: ffffffff99490613
[  355.901467][    C3] RBP: 0000000000000286 R08: ffffffff973b3820 R09: 1ffffffff3587d1a
[  355.901468][    C3] R10: 0000000000000003 R11: 0000000000000000 R12: ffffffff9d1138a8
[  355.901469][    C3] R13: 0000000000000001 R14: ffffffff9d1138e0 R15: ff11000004ad4c00
[  355.901470][    C3]  ? trace_irq_enable.constprop.0+0x30/0x180
[  355.901472][    C3]  ? _raw_spin_unlock_irqrestore+0x53/0x80
[  355.901474][    C3]  uart_write+0x231/0x990
[  355.901477][    C3]  process_output_block+0x110/0x760
[  355.901479][    C3]  ? trace_irq_enable.constprop.0+0x9b/0x180
[  355.901480][    C3]  ? do_raw_spin_unlock+0x59/0x250
[  355.901483][    C3]  n_tty_write+0x3b9/0x950
[  355.901485][    C3]  ? n_tty_receive_signal_char+0x110/0x110
[  355.901487][    C3]  ? _mutex_trylock_nest_lock+0x235/0x390
[  355.901488][    C3]  ? __init_waitqueue_head+0x160/0x160
[  355.901491][    C3]  iterate_tty_write+0x291/0x590
[  355.901493][    C3]  ? tty_ldisc_ref_wait+0x28/0x80
[  355.901495][    C3]  file_tty_write.isra.0+0x1bd/0x290
[  355.901497][    C3]  ? redirected_tty_write+0xd0/0xd0
[  355.901498][    C3]  new_sync_write+0x333/0x750
[  355.901500][    C3]  ? clockevents_program_event+0x307/0x7e0
[  355.901502][    C3]  ? rcu_is_watching+0x15/0xd0
[  355.901503][    C3]  ? new_sync_read+0x740/0x740
[  355.901505][    C3]  ? generic_write_checks_count+0x480/0x480
[  355.901508][    C3]  vfs_write+0x6a4/0xc10
[  355.901510][    C3]  ? vfs_read+0x3dd/0x7b0
[  355.901511][    C3]  ksys_write+0x116/0x250
[  355.901512][    C3]  ? __ia32_sys_read+0xc0/0xc0
[  355.901514][    C3]  ? restore_fpregs_from_fpstate+0x44/0x130
[  355.901517][    C3]  ? rcu_is_watching+0x15/0xd0
[  355.901519][    C3]  do_syscall_64+0x117/0x590
[  355.901520][    C3]  ? irq_exit_rcu+0x1a/0x30
[  355.901521][    C3]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  355.901523][    C3] RIP: 0033:0x7ff15d73008e
[  355.901524][    C3] Code: 4d 89 d8 e8 94 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
[  355.901525][    C3] RSP: 002b:00007ffecbc85030 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  355.901527][    C3] RAX: ffffffffffffffda RBX: 000055fd26eab2c0 RCX: 00007ff15d73008e
[  355.901528][    C3] RDX: 0000000000000001 RSI: 000055fd26eab2c0 RDI: 0000000000000001
[  355.901529][    C3] RBP: 00007ffecbc85040 R08: 0000000000000000 R09: 0000000000000000
[  355.901529][    C3] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001
[  355.901530][    C3] R13: 000055fd26e72010 R14: 0000000000000001 R15: 000055fd26eab2c0
[  355.901532][    C3]  </TASK>