task gphotofs blocked when ls on mounted mtp fs (android)

kernel detect blocked of tasks pool, gvfsd-trash and gphotofs when make ls on mounted mtp fs of android (4.3) phone (Mann zug 3).

Debian sid (Debian GNU/Linux 7-updates (n/a))
Kernel version (uname -a): Linux ws1 4.2.0-1-amd64 #1 SMP Debian 4.2.5-1 (2015-10-27) x86_64 GNU/Linux

gphotofs --version

  fusermount version: 2.9.4
  using FUSE kernel interface version 7.19

sylog messages:

INFO: task pool:12404 blocked for more than 120 seconds.
      Tainted: G O 4.2.0-1-amd64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this m
pool D 0000000000000000 0 12404 1 0x00000000
 ffff8802362d2280 0000000000000082 ffff8800bb59c858 ffff88006eece1
 ffff88019f0e7db8 ffff88019f0e8000 ffff8801afe17cac ffff8802362d22
 00000000ffffffff ffff8801afe17cb0 00007fa620001ea0 ffffffff8154ff
Call Trace:
 [<ffffffff8154ff9f>] ? schedule+0x2f/0x70
 [<ffffffff8155024e>] ? schedule_preempt_disabled+0xe/0x20
 [<ffffffff81551ab5>] ? __mutex_lock_slowpath+0x85/0x100
 [<ffffffff81551b4b>] ? mutex_lock+0x1b/0x30
 [<ffffffff811c82bf>] ? walk_component+0x1af/0x460
 [<ffffffff811c794a>] ? path_init+0x1ea/0x3c0
 [<ffffffff811c8b68>] ? path_lookupat+0x58/0x100
 [<ffffffff811cb5e5>] ? filename_lookup+0x95/0x150
 [<ffffffff811cb26f>] ? getname_flags+0x6f/0x1e0
 [<ffffffff811c0f79>] ? vfs_fstatat+0x49/0x90
 [<ffffffff812cd135>] ? strlcpy+0x35/0x50
 [<ffffffff811c144f>] ? SYSC_newlstat+0x1f/0x40
 [<ffffffff81080c10>] ? SyS_prctl+0x170/0x400
 [<ffffffff8101e611>] ? fpu__restore+0xe1/0x130
 [<ffffffff815538b2>] ? system_call_fast_compare_end+0xc/0x6b

INFO: task gphotofs:12407 blocked for more than 120 seconds.
      Tainted: G O 4.2.0-1-amd64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this m
gphotofs D ffffffff8109a1b0 0 12407 1 0x00000000
 ffff88019f009400 0000000000000086 ffff8800bb59c858 ffffffff81a145
 ffff88013cdcfdb8 ffff88013cdd0000 ffff8801afe17cac ffff88019f0094
 00000000ffffffff ffff8801afe17cb0 00007ffce6373860 ffffffff8154ff
Call Trace:
 [<ffffffff8154ff9f>] ? schedule+0x2f/0x70
 [<ffffffff8155024e>] ? schedule_preempt_disabled+0xe/0x20
 [<ffffffff81551ab5>] ? __mutex_lock_slowpath+0x85/0x100
 [<ffffffff81551b4b>] ? mutex_lock+0x1b/0x30
 [<ffffffff811c82bf>] ? walk_component+0x1af/0x460
 [<ffffffff811c794a>] ? path_init+0x1ea/0x3c0
 [<ffffffff811c8b68>] ? path_lookupat+0x58/0x100
 [<ffffffff811cb5e5>] ? filename_lookup+0x95/0x150
 [<ffffffff811cb26f>] ? getname_flags+0x6f/0x1e0
 [<ffffffff811c0f79>] ? vfs_fstatat+0x49/0x90
 [<ffffffff811c140c>] ? SYSC_newstat+0x1c/0x40
 [<ffffffff811bd542>] ? SyS_read+0x42/0xa0
 [<ffffffff815538b2>] ? system_call_fast_compare_end+0xc/0x6b

INFO: task gvfsd-trash:8573 blocked for more than 120 seconds.
      Tainted: G O 4.2.0-1-amd64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this m
gvfsd-trash D ffffffff8109a1b0 0 8573 1 0x00000000
 ffff8801e8c6a7c0 0000000000000082 ffff8800bb59c858 ffff880236218d
 ffff880085047db8 ffff880085048000 ffff8801afe17cac ffff8801e8c6a7
 00000000ffffffff ffff8801afe17cb0 0000000000407e60 ffffffff8154ff
Call Trace:
 [<ffffffff8154ff9f>] ? schedule+0x2f/0x70
 [<ffffffff8155024e>] ? schedule_preempt_disabled+0xe/0x20
 [<ffffffff81551ab5>] ? __mutex_lock_slowpath+0x85/0x100
 [<ffffffff81551b4b>] ? mutex_lock+0x1b/0x30
 [<ffffffff811c82bf>] ? walk_component+0x1af/0x460
 [<ffffffff811c794a>] ? path_init+0x1ea/0x3c0
 [<ffffffff811c8b68>] ? path_lookupat+0x58/0x100
 [<ffffffff811cb5e5>] ? filename_lookup+0x95/0x150
 [<ffffffff811cb26f>] ? getname_flags+0x6f/0x1e0
 [<ffffffff811f9b4a>] ? __fsnotify_update_child_dentry_flags.part.
 [<ffffffff811c0f79>] ? vfs_fstatat+0x49/0x90
 [<ffffffff811d227a>] ? dput+0x2a/0x220
 [<ffffffff811c144f>] ? SYSC_newlstat+0x1f/0x40
 [<ffffffff811fc90f>] ? SyS_inotify_add_watch+0x1af/0x330
 [<ffffffff815538b2>] ? system_call_fast_compare_end+0xc/0x6b