touch-packages team mailing list archive

[Gerry Boland <1379438@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Steps to repro
1. freshly boot the device
2. ssh in
3. "stop unity8"

It will often hang there for some time.


>From the backtrace (http://pastebin.ubuntu.com/8527967/), this is the thread I most suspect:

Thread 3 (Thread 0xa2ab6450 (LWP 3462)):
#0  0xb5ff2554 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0
#1  0xb5fee192 in pthread_cond_wait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0
#2  0xb636705c in wait (time=4294967295, this=0xa8ac1400) at thread/qwaitcondition_unix.cpp:136
#3  QWaitCondition::wait (this=<optimized out>, mutex=0xa86c6c40, time=time@entry=4294967295) at thread/qwaitcondition_unix.cpp:208
#4  0xb635e818 in QFutureInterfaceBase::waitForResult (this=this@entry=0xa2ab5c4c, resultIndex=resultIndex@entry=0) at thread/qfutureinterface.cpp:313
#5  0xa8eb0810 in result (this=0xa2ab5c4c) at /usr/include/arm-linux-gnueabihf/qt5/QtCore/qfuture.h:171
#6  QLightDM::GreeterImpl::converseWithPam (num_msg=1, msg=<optimized out>, resp=0xa2ab5c88, appdata_ptr=0x106aeb8) at /build/buildd/unity8-8.00+14.10.20141009.4/tests/mocks/LightDM/demo/GreeterPrivate.cpp:165
#7  0xa8e5b092 in pam_vprompt (pamh=0x10c1c30, style=1, response=0xa2ab5ce0, fmt=fmt@entry=0xa3a9798c "%s", args=...) at pam_vprompt.c:83
#8  0xa8e5b184 in pam_prompt (pamh=<optimized out>, style=<optimized out>, response=<optimized out>, fmt=0xa3a9798c "%s") at pam_vprompt.c:111
#9  0xa3a94304 in ?? () from /lib/arm-linux-gnueabihf/security/pam_extrausers.so
Backtrace stopped: previous frame identical to this frame (corrupt stack?)


QLightDM::GreeterImpl::converseWithPam is blocking shutdown

** Affects: unity8 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1379438

Title:
  unity8 often hangs on shutdown - but if you touch the screen it stops
  correctly

Status in “unity8” package in Ubuntu:
  New

Bug description:
  Steps to repro
  1. freshly boot the device
  2. ssh in
  3. "stop unity8"

  It will often hang there for some time.

  
  From the backtrace (http://pastebin.ubuntu.com/8527967/), this is the thread I most suspect:

  Thread 3 (Thread 0xa2ab6450 (LWP 3462)):
  #0  0xb5ff2554 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0
  #1  0xb5fee192 in pthread_cond_wait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0
  #2  0xb636705c in wait (time=4294967295, this=0xa8ac1400) at thread/qwaitcondition_unix.cpp:136
  #3  QWaitCondition::wait (this=<optimized out>, mutex=0xa86c6c40, time=time@entry=4294967295) at thread/qwaitcondition_unix.cpp:208
  #4  0xb635e818 in QFutureInterfaceBase::waitForResult (this=this@entry=0xa2ab5c4c, resultIndex=resultIndex@entry=0) at thread/qfutureinterface.cpp:313
  #5  0xa8eb0810 in result (this=0xa2ab5c4c) at /usr/include/arm-linux-gnueabihf/qt5/QtCore/qfuture.h:171
  #6  QLightDM::GreeterImpl::converseWithPam (num_msg=1, msg=<optimized out>, resp=0xa2ab5c88, appdata_ptr=0x106aeb8) at /build/buildd/unity8-8.00+14.10.20141009.4/tests/mocks/LightDM/demo/GreeterPrivate.cpp:165
  #7  0xa8e5b092 in pam_vprompt (pamh=0x10c1c30, style=1, response=0xa2ab5ce0, fmt=fmt@entry=0xa3a9798c "%s", args=...) at pam_vprompt.c:83
  #8  0xa8e5b184 in pam_prompt (pamh=<optimized out>, style=<optimized out>, response=<optimized out>, fmt=0xa3a9798c "%s") at pam_vprompt.c:111
  #9  0xa3a94304 in ?? () from /lib/arm-linux-gnueabihf/security/pam_extrausers.so
  Backtrace stopped: previous frame identical to this frame (corrupt stack?)

  
  QLightDM::GreeterImpl::converseWithPam is blocking shutdown

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