SWT / anr problem - SWT causes kernel fuse deadlock

Problem description ：

This is a SWT The problem is monkey Easy to reproduce in the test , When this problem occurs , Will trigger memory dump..

Problem analysis ：

according to trace .txt journal , Some threads are waiting for locks “0x042bde16” Held threads Binder:1352_18, This is a waiting lock “0x0e84470e” Held threads “Binder:1352_13”, Blocking functions wait_answer_interruptible() Is to call functions in the file system __fuse_request_send() in .

 

from memory dump Analysis can find :

v.f /locals /task 0xFFFFFFC061CC6E40 state:0x2, 1749(sdcard ) 0xFFFFFFC001F852A8 15410(Thread-2 ) 
 

[Kernel backtrace 1] 
1749 341 1737 3 DSleep ffffffc061cc6e40 120 14144 2008 sdcard 
[<ffffffc000087710>] __switch_to+0x70 
[<ffffffc000cdd578>] __schedule+0x548 
[<ffffffc000cdd874>] schedule+0x70 
[<ffffffc000cddbe0>] schedule_preempt_disabled+0x14 
[<ffffffc000cdf238>] __mutex_lock_slowpath+