[   51.676829][  T110] su (110) used greatest stack depth: 24104 bytes left
[   51.676844][  T110] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[   51.676846][  T110] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 110, name: su
[   51.676847][  T110] preempt_count: 2, expected: 0
[   51.676848][  T110] RCU nest depth: 0, expected: 0
[   51.676849][  T110] locks held by su/110: 5, last CPU#1:
[   51.676852][  T110]  #0: ffffffffa4c027b8 (low_water_lock){+.+.}-{3:3}, at: do_exit+0x887/0xdc0
[   51.676868][  T110]  #1: ffffffffa4d69cc0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x320/0x3e0
[   51.676873][  T110]  #2: ffffffffa4d69d38 (console_srcu){....}-{0:0}, at: console_flush_one_record+0x106/0x710
[   51.676877][  T110]  #3: ffffffffa4c89660 (console_owner){....}-{0:0}, at: console_lock_spinning_enable+0x40/0x60
[   51.676880][  T110]  #4: ffffffffa4c89560 (printk_legacy_map-wait-type-override){....}-{3:3}, at: console_emit_next_record+0x1df/0x4c0
[   51.676883][  T110] irq event stamp: 168364
[   51.676884][  T110] hardirqs last  enabled at (168363): [<ffffffffa1b6d546>] __down_trylock_console_sem+0x86/0xa0
[   51.676887][  T110] hardirqs last disabled at (168364): [<ffffffffa1b735f4>] console_emit_next_record+0x3d4/0x4c0
[   51.676889][  T110] softirqs last  enabled at (167702): [<ffffffffa19caa2c>] handle_softirqs+0x67c/0x900
[   51.676891][  T110] softirqs last disabled at (167691): [<ffffffffa19cae65>] __irq_exit_rcu+0x145/0x1c0
[   51.676893][  T110] Preemption disabled at:
[   51.676894][  T110] [<0000000000000000>] 0x0
[   51.676900][  T110] CPU: 1 UID: 0 PID: 110 Comm: su Tainted: G        W           7.2.0-virtme #1 PREEMPT(full) 
[   51.676903][  T110] Tainted: [W]=WARN
[   51.676904][  T110] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   51.676906][  T110] Call Trace:
[   51.676907][  T110]  <TASK>
[   51.676909][  T110]  dump_stack_lvl+0x6f/0xa0
[   51.676915][  T110]  __might_resched.cold+0x1fe/0x2c1
[   51.676919][  T110]  ? perf_trace_sched_switch+0x7c0/0x7c0
[   51.676922][  T110]  ? __kmalloc_noprof+0xdb/0x760
[   51.676927][  T110]  __kmalloc_noprof+0x443/0x760
[   51.676930][  T110]  ? alloc_buf.isra.0+0x4b/0x260
[   51.676935][  T110]  ? do_raw_spin_unlock+0x59/0x250
[   51.676938][  T110]  alloc_buf.isra.0+0x4b/0x