[  172.302035][  T118] su (118) used greatest stack depth: 23744 bytes left
[  172.302051][  T118] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[  172.302054][  T118] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 118, name: su
[  172.302056][  T118] preempt_count: 2, expected: 0
[  172.302056][  T118] RCU nest depth: 0, expected: 0
[  172.302057][  T118] INFO: lockdep is turned off.
[  172.302058][  T118] irq event stamp: 127000
[  172.302059][  T118] hardirqs last  enabled at (126999): [<ffffffff895e1483>] _raw_spin_unlock_irqrestore+0x53/0x80
[  172.302067][  T118] hardirqs last disabled at (127000): [<ffffffff895c3b26>] __schedule+0x1246/0x20e0
[  172.302070][  T118] softirqs last  enabled at (126892): [<ffffffff86ad9d89>] fpu_clone+0xd9/0x410
[  172.302074][  T118] softirqs last disabled at (126890): [<ffffffff86ad9d32>] fpu_clone+0x82/0x410
[  172.302076][  T118] Preemption disabled at:
[  172.302077][  T118] [<0000000000000000>] 0x0
[  172.302083][  T118] CPU: 3 UID: 0 PID: 118 Comm: su Tainted: G        W           7.2.0-virtme #1 PREEMPT(full) 
[  172.302086][  T118] Tainted: [W]=WARN
[  172.302087][  T118] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  172.302089][  T118] Call Trace:
[  172.302090][  T118]  <TASK>
[  172.302091][  T118]  dump_stack_lvl+0x6f/0xa0
[  172.302097][  T118]  __might_resched.cold+0x1fe/0x2c1
[  172.302100][  T118]  ? perf_trace_sched_switch+0x7c0/0x7c0
[  172.302104][  T118]  ? __asan_memcpy+0x3c/0x60
[  172.302107][  T118]  ? rcu_is_watching+0x16/0xd0
[  172.302110][  T118]  __kmalloc_noprof+0x443/0x760
[  172.302112][  T118]  ? __rwlock_init+0x150/0x150
[  172.302115][  T118]  ? alloc_buf.isra.0+0x4b/0x260
[  172.302120][  T118]  ? do_raw_spin_unlock+0x59/0x250
[  172.302121][  T118]  alloc_buf.isra.0+0x4b/0x260
[  172.302124][  T118]  put_chars+0x1e1/0x2f0
[  172.302125][