[   63.489851][  T109] su (109) used greatest stack depth: 23024 bytes left
[   63.489871][  T109] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322
[   63.489873][  T109] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 109, name: su
[   63.489874][  T109] preempt_count: 2, expected: 0
[   63.489875][  T109] RCU nest depth: 0, expected: 0
[   63.489876][  T109] locks held by su/109: 5, last CPU#1:
[   63.489879][  T109]  #0: ffffffff956027b8 (low_water_lock){+.+.}-{3:3}, at: do_exit+0x887/0xd