[   15.306575][  T109] su (109) used greatest stack depth: 23776 bytes left
[   15.306595][  T109] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[   15.306598][  T109] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 109, name: su
[   15.306599][  T109] preempt_count: 2, expected: 0
[   15.306600][  T109] RCU nest depth: 0, expected: 0
[   15.306601][  T109] locks held by su/109: 5, last CPU#1:
[   15.306604][  T109]  #0: ffffffffb26027b8 (low_water_lock){+.