[   17.876667][  T109] su (109) used greatest stack depth: 24104 bytes left
[   17.876686][  T109] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[   17.876688][  T109] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 109, name: su
[   17.876689][  T109] preempt_count: 2, expected: 0
[   17.876690][  T109] RCU nest depth: 0, expected: 0
[   17.876691][  T109] locks held by su/109: 5, last CPU#3:
[   17.876694][  T109]  #0: ffffffff9f4027b8 (low_water_lock){+.+.}-{3:3}, at: do_exit+0x887/0xdc0
[   17.876706][  T109]  #1: ffff