[   56.346944][  T110] su (110) used greatest stack depth: 23776 bytes left
[   56.346966][  T110] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[   56.346968][  T110] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 110, name: su
[   56.346970][  T110] preempt_count: 2, expected: 0
[   56.346971][  T110] RCU nest depth: 0, expected: 0
[   56.346972][  T110] locks held by su/110: 5, last CPU#0:
[   56.346974][  T110]  #0: ffffffffb04027b8 (low_water_lock){+.+.}-{3:3}, at: do_exit+0x887/0xdc0
[   56.346987][  T110]  #1: ffffffffb0569cc0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x320/0x3e0
[   56.346993][  T110]  #2: ffffffffb0569d38 (console_srcu){....}-{0:0}, at: console_flush_one_record+0x106/0x710
[   56.346996][  T110]  #3: ffffffffb0489660 (console_owner){....}-{0:0}, at: console_lock_spinning_enable+0x40/0x60
[   56.347000][  T110]  #4: ffffffffb0489560 (printk_legacy_map-wait-type-override){....}-{3:3}, at: console_emit_next_record+0x1df/0x4c0
[   56.347003][  T110] irq event stamp: 164818
[   56.347004][  T110] hardirqs last  enabled at (164817): [<ffffffffad36d546>] __down_trylock_console_sem+0x86/0xa0
[   56.347007][  T110] hardirqs last disabled at (164818): [<ffffffffad3735f4>] console_emit_next_record+0x3d4/0x4c0
[   56.347009][  T110] softirqs last  enabled at (163806): [<ffffffffad1caa2c>] handle_softirqs+0x67c/0x900
[   56.347011][  T110] softirqs last disabled at (162905): [<ffffffffad1cae65>] __irq_exit_rcu+0x145/0x1c0
[   56.347014][  T110] Preemption disabled at:
[   56.347014][  T110] [<0000000000000000>] 0x0
[   56.347022][  T110] CPU: 0 UID: 0 PID: 110 Comm: su Tainted: G        W           7.2.0-virtme #1 PREEMPT(full) 
[   56.347025][  T110] Tainted: [W]=WARN
[   56.347026][  T110] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   56.347028][  T110] Call Trace:
[   56.347029][  T110]  <TASK>
[   56.347031][  T110]  dump_stack_lvl+0x6f/0xa0
[   56.347037][  T110]  __might_resched.cold+0x1fe/0x2c1
[   56.347042][  T110]  ? perf_trace_sched_switch+0x7c0/0x7c0
[   56.347045][  T110]  ? __kmalloc_noprof+0xdb/0x760
[   56.347051][  T110]  __kmalloc_noprof+0x443/0x760
[   56.347053][  T110]  ? alloc_buf.isra.0+0x4b/0x260
[   56.347060][  T110]  ? do_raw_spin_unlock+0x59/0x250
[   56.347062][  T110]  alloc_buf.isra.0+0x4b/0x260
[   56.347066][  T110]  put_chars+0x1e1/0x2f0
[   56.347069][  T110]  ? __send_to_port+0x420/0x420
[   56.347071][  T110]  ? rcu_lockdep_current_cp