[   11.331467][  T109] su (109) used greatest stack depth: 23968 bytes left
[   11.331483][  T109] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[   11.331485][  T109] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 109, name: su
[   11.331486][  T109] preempt_count: 2, expected: 0
[   11.331487][  T109] RCU nest depth: 0, expected: 0
[   11.331488][  T109] locks held by su/109: 5, last CPU#3:
[   11.331490][  T109]  #0: ffffffffb7e027b8 (low_water_lock){+.+.}-{3:3}, at: do_exit+0x887/0xdc0
[   11.331503][  T109]  #1: ffffffffb7f69cc0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x320/0x3e0
[   11.331507][  T109]  #2: ffffffffb7f69d38 (console_srcu){....}-{0:0}, at: console_flush_one_record+0x106/0x710
[   11.331511][  T109]  #3: ffffffffb7e89660 (console_owner){....}-{0:0}, at: console_lock_spinning_enable+0x40/0x60
[   11.331514][  T109]  #4: ffffffffb7e89560 (printk_legacy_map-wait-type-override){....}-{3:3}, at: console_emit_next_record+0x1df/0x4c0
[   11.331517][  T109] irq event stamp: 161744
[   11.331518][  T109] hardirqs last  enabled at (161743): [<ffffffffb4d6d546>] __down_trylock_console_sem+0x86/0xa0
[   11.331522][  T109] hardirqs last disabled at (161744): [<ffffffffb4d735f4>] console_emit_next_record+0x3d4/0x4c0
[   11.331523][  T109] softirqs last  enabled at (160630): [<ffffffffb4bcaa2c>] handle_softirqs+0x67c/0x900
[   11.331525][  T109] softirqs last disabled at (160625): [<ffffffffb4bcae65>] __irq_exit_rcu+0x145/0x1c0
[   11.331527][  T109] Preemption disabled at:
[   11.331528][  T109] [<0000000000000000>] 0x0
[   11.331534][  T109] CPU: 3 UID: 0 PID: 109 Comm: su Tainted: G        W           7.2.0-virtme #1 PREEMPT(full) 
[   11.331537][  T109] Tainted: [W]=WARN
[   11.331538][  T109] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.331540][  T109] Call Trace:
[   11.331541][  T109]  <TASK>
[   11.331543][  T109]  dump_stack_lvl+0x6f/0xa0
[   11.331548][  T109]  __might_resched.cold+0x1fe/0x2c1
[   11.331553][