vold: do not acquire lock when abort fuse
reboot maybe cause a deadlock scenario:
1:init->vdc->vold for abort_fuse blocked on futex hold by another
vold binder_x
2:binder_x blocked in binder_ioctl_write_read wait a dead service's
response
3:dead service is exiting and schedule a deferred work for put files
in binder_vma_close, after put files is completed, the binder_x will
eventually wake up
4:kworker execute binder_deferred_work is blocked on fuse request:
crash> bt 1707
PID: 1707 TASK:
ffffffe366175e80 CPU: 2 COMMAND: "kworker/2:4"
#0 [
ffffff801b8b3ac0] __switch_to at
ffffff962ce88a60
#1 [
ffffff801b8b3b10] __schedule at
ffffff962e2d3d30
#2 [
ffffff801b8b3b70] schedule at
ffffff962e2d3ff4
#3 [
ffffff801b8b3bc0] __fuse_request_send at
ffffff962d20e008
#4 [
ffffff801b8b3c00] fuse_request_send at
ffffff962d20deac
#5 [
ffffff801b8b3c30] fuse_flush at
ffffff962d217fa4
#6 [
ffffff801b8b3c80] filp_close at
ffffff962d0bd7b4
#7 [
ffffff801b8b3cb0] put_files_struct at
ffffff962d0e7658
#8 [
ffffff801b8b3d30] binder_deferred_func at
ffffff962dc9e60c
#9 [
ffffff801b8b3d90] process_one_work at
ffffff962cee761c
#10 [
ffffff801b8b3e00] worker_thread at
ffffff962cee7a68
#11 [
ffffff801b8b3e60] kthread at
ffffff962ceecc14
waiting for init abort_fuse
suggested by maco, do not acquire lock when abort fuse.
Test: reboot stress test
Change-Id: If6dd7f5e9c413a16ba047204c33d82d6ff41c4ae
Signed-off-by: lijiazi <lijiazi@xiaomi.com>