[  148.704687][  T112] su (112) used greatest stack depth: 22976 bytes left
[  148.704707][  T112] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[  148.704709][  T112] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 112, name: su
[  148.704710][  T112] preempt_count: 2, expected: 0
[  148.704711][  T112] RCU nest depth: 0, expected: 0
[  148.704712][  T112] locks held by su/112: 5, last CPU#1:
[  148.704714][  T112]  #0: ffffffff900127b8 (low_water_lock){+.+.}-{3:3}, at: do_exit+0x887/0xdc0
[  148.704726][  T112]  #1: ffffffff90179cc0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x320/0x3e0
[  148.704732][  T112]  #2: ffffffff90179d38 (console_srcu){....}-{0:0}, at: console_flush_one_record+0x106/0x710
[  148.704735][  T112]  #3: ffffffff90099660 (console_owner){....}-{0:0}, at: console_lock_spinning_enable+0x40/0x60
[  148.704739][  T112]  #4: ffffffff90099560 (printk_legacy_map-wait-type-override){....}-{3:3}, at: console_emit_next_record+0x1df/0x4c0
[  148.704743][  T112] irq event stamp: 156778
[  148.704744][  T112] hardirqs last  enabled at (156777): [<ffffffff8cd7a546>] __down_trylock_console_sem+0x86/0xa0
[  148.704746][  T112] hardirqs last disabled at (156778): [<ffffffff8cd805f4>] console_emit_next_record+0x3d4/0x4c0
[  148.704748][  T112] softirqs last  enabled at (154620): [<ffffffff8cbd7a2c>] handle_softirqs+0x67c/0x900
[  148.704750][  T112] softirqs last disabled at (154497): [<ffffffff8cbd7e65>] __irq_exit_rcu+0x145/0x1c0
[  148.704752][  T112] Preemption disabled at:
[  148.704753][  T112] [<0000000000000000>] 0x0
[  148.704760][  T112] CPU: 1 UID: 0 PID: 112 Comm: su Tainted: G        W           7.2.0-virtme #1 PREEMPT(full) 
[  148.704763][  T112] Tainted: [W]=WARN
[  148.704764][  T112] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  148.704766][  T112] Call Trace:
[  148.704768][  T112]  <TASK>
[  148.704769][