[  244.831088][  T117] su (117) used greatest stack depth: 23976 bytes left
[  244.831106][  T117] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[  244.831109][  T117] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 117, name: su
[  244.831110][  T117] preempt_count: 2, expected: 0
[  244.831111][  T117] RCU nest depth: 0, expected: 0
[  244.831112][  T117] INFO: lockdep is turned off.
[  244.831113][  T117] irq event stamp: 144168
[  244.831114][  T117] hardirqs last  enabled at (144167): [<ffffffffa6de1483>] _raw_spin_unlock_irqrestore+0x53/0x80
[  244.831122][  T117] hardirqs last disabled at (144168): [<ffffffffa6dc3b26>] __schedule+0x1246/0x20e0
[  244.831125][  T117] softirqs last  enabled at (144060): [<ffffffffa42d9d89>] fpu_clone+0xd9/0x410
[  244.831129][  T117] softirqs last disabled at (144058): [<ffffffffa42d9d32>] fpu_clone+0x82/0x410
[  244.831131][  T117] Preemption disabled at:
[  244.831132][  T117] [<0000000000000000>] 0x0
[  244.831138][  T117] CPU: 0 UID: 0 PID: 117 Comm: su Tainted: G        W           7.2.0-virtme #1 PREEMPT(full) 
[  244.831141][  T117] Tainted: [W]=WARN
[  244.831142][  T117] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  244.831144][  T117] Call Trace:
[  244.831146][  T117]  <TASK>
[  244.831147][  T117]  dump_stack_lvl+0x6f/0xa0
[  244.831152][