[   81.917748][  T109] su (109) used greatest stack depth: 24104 bytes left
[   81.917767][  T109] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[   81.917770][  T109] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 109, name: su
[   81.917771][  T109] preempt_count: 2, expected: 0
[   81.917772][  T109] RCU nest depth: 0, expected: 0
[   81.917773][  T109] locks held by su/109: 5, last CPU#3:
[   81.917775][  T109]  #0: ffffffff946027b8 (low_water_lock){+.+.}-{3:3}, at: do_exit+0x887/0xdc0
[   81.917788][  T109]  #1: ffffffff94769cc0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x320/0x3e0
[   81.917793][  T109]  #2: ffffffff94769d38 (console_srcu){....}-{0:0}, at: console_flush_one_record+0x106/0x710
[   81.917797][  T109]  #3: ffffffff94689660 (console_owner){....}-{0:0}, at: console_lock_spinning_enable+0x40/0x60
[   81.917801][  T109]  #4: ffffffff94689560 (printk_legacy_map-wait-type-override){....}-{3:3}, at: console_emit_next_record+0x1df/0x4c0
[   81.917805][  T109] irq event stamp: 164998
[   81.917806][  T109] hardirqs last  enabled at (164997): [<ffffffff91570546>] __down_trylock_console_sem+0x86/0xa0
[   81.917808][  T109] hardirqs last disabled at (164998): [<ffffffff915765f4>] console_emit_next_record+0x3d4/0x4c0
[   81.917810][  T109] softirqs last  enabled at (159748): [<ffffffff913cda2c>] handle_softirqs+0x67c/0x900
[   81.917812][  T109] softirqs last disabled at (159577): [<ffffffff913cde65>] __irq_exit_rcu+0x145/0x1c0
[   81.917814][  T109] Preemption disabled at:
[   81.917815][  T109] [<0000000000000000>] 0x0
[   81.917823][  T109] CPU: 3 UID: 0 PID: 109 Comm: su Tainted: G        W           7.2.0-virtme #1 PREEMPT(full) 
[   81.917826][  T109] Tainted: [W]=WARN
[   81.917827][  T109] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   81.917829][  T109] Call Trace:
[   81.917830][  T109]  <TASK>
[   81.917832][  T109]  dump_stack_lvl+0x6f/0xa0
[   81.917838][  T109]  __might_resched.cold+0x1fe/0x2c1
[   81.917842][  T109]  ? perf_trace_sched_switch+0x7c0/0x7c0
[   81.917846][  T109]  ? __kmalloc_noprof+0xdb/0x760
[   81.917852][  T109]  __kmalloc_noprof+0x443/0x760
[   81.917854][  T109]  ? alloc_buf.isra.0+0x4b/0x260
[   81.917860][  T109]  ? do_raw_spin_unlock+0x59/0x250
[   81.917863][  T109]  alloc_buf.isra.0+0x4b/0x260
[   81.917866][  T109]  put_chars+0x1e1/0x2f0
[   81.917869][  T109]  ? __send_to_port+0x420/0x420
[   81.917870][  T109]  ? rcu_lockdep_current_cpu_online+0x3f/0x1b0
[   81.917875][  T109]  ? validate_chain+0x38b/0xc20
[   81.917880][  T109]  hvc_console_print+0x292/0x780
[   81.917886][  T109]  ? hvc_write+0x3a0/0x3a0
[   81.917888][  T109]  ? rcu_is_watching+0x16/0xd0
[   81.917890][  T109]  ? lock_acquire+0x13c/0x160
[   81.917894][  T109]  console_