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[Bug 1523926] [NEW] Dummy sensor backend can block

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Public bug reported:

See the attached gdb output, it's likely that the dummy/test sensor
backend is blocking unity8 startup.

(gdb) info threads
  Id   Target Id         Frame 
  14   Thread 0xb3781410 (LWP 31081) "unity8" 0xb61e1970 in recvmsg () at ../sysdeps/unix/syscall-template.S:81
  13   Thread 0xb2f81410 (LWP 31082) "unity8" syscall () at ../sysdeps/unix/sysv/linux/arm/syscall.S:37
  12   Thread 0xb225c410 (LWP 31083) "MirServerThread" 0xb61da4e2 in poll () at ../sysdeps/unix/syscall-template.S:81
  11   Thread 0xb18a0410 (LWP 31085) "RPC Thread" 0xb61da4e2 in poll () at ../sysdeps/unix/syscall-template.S:81
  10   Thread 0xb0eff410 (LWP 31086) "arch_worker" 0xb4422840 in ?? ()
  9    Thread 0xb2523b40 (LWP 31087) "MirServerThread" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:47
  8    Thread 0xb04ff410 (LWP 31088) "SWD-GPU Job" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
  7    Thread 0xafcff410 (LWP 31089) "SWD-Frame" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
  6    Thread 0xaf301410 (LWP 31090) "Input dispatch" 0xb61da4e2 in poll () at ../sysdeps/unix/syscall-template.S:81
  5    Thread 0xaeb01410 (LWP 31091) "Mir/Snapshot" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
  4    Thread 0xae301410 (LWP 31092) "Mir/IPC" 0xb61e1132 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
  3    Thread 0xadb01410 (LWP 31093) "Mir/IPC" 0xb61e1132 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
  2    Thread 0xac76d410 (LWP 31094) "unity8" 0xb61d6ae0 in read () at ../sysdeps/unix/syscall-template.S:81
* 1    Thread 0xb6f9f000 (LWP 31079) "unity8" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46

Thread 2 (Thread 0xac76d410 (LWP 31094)):
#0  0xffffffff in read () at ../sysdeps/unix/syscall-template.S:81
#1  0xffffffff in SensorController::fifo_take_command() (__nbytes=1, __buf=0xac76cdcf, __fd=<optimized out>) at /usr/include/arm-linux-gnueabihf/bits/unistd.h:44
#2  0xffffffff in SensorController::fifo_take_command() (this=0xac7861e8 <SensorController::instance()::_inst>) at /build/platform-api-1_CRAF/platform-api-3.0.1+15.04.20151127/src/ubuntu/application/testbackend/ubuntu_application_sensors.cpp:287
#3  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (__closure=0xd46f68)
    at /build/platform-api-1_CRAF/platform-api-3.0.1+15.04.20151127/src/ubuntu/application/testbackend/ubuntu_application_sensors.cpp:233
#4  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (this=0xd46f68) at /usr/include/c++/4.9/functional:1700
#5  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (this=0xd46f68) at /usr/include/c++/4.9/functional:1688
#6  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (this=0xd46f5c) at /usr/include/c++/4.9/thread:115
#7  0xffffffff in std::(anonymous namespace)::execute_native_thread_routine(void*) (__p=<optimized out>) at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:84
#8  0xffffffff in start_thread (arg=0x0) at pthread_create.c:335
#9  0xffffffff in  () at ../sysdeps/unix/sysv/linux/arm/clone.S:89

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-application-api3-test-dbgsym 3.0.1+15.04.20151127-0ubuntu1 [origin: LP-PPA-ci-train-ppa-service-landing-022]
Uname: Linux 3.4.67 armv7l
ApportVersion: 2.17.2-0ubuntu1.3touch1
Architecture: armhf
Date: Tue Dec  8 15:08:53 2015
InstallationDate: Installed on 2015-12-08 (0 days ago)
InstallationMedia: Ubuntu 15.04 - armhf (20151208-020303)
SourcePackage: platform-api
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: platform-api (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug armhf third-party-packages vivid

** Attachment added: "gdb.txt"
   https://bugs.launchpad.net/bugs/1523926/+attachment/4531500/+files/gdb.txt

** Description changed:

  See the attached gdb output, it's likely that the dummy/test sensor
  backend is blocking unity8 startup.
+ 
+ (gdb) info threads
+   Id   Target Id         Frame 
+   14   Thread 0xb3781410 (LWP 31081) "unity8" 0xb61e1970 in recvmsg () at ../sysdeps/unix/syscall-template.S:81
+   13   Thread 0xb2f81410 (LWP 31082) "unity8" syscall () at ../sysdeps/unix/sysv/linux/arm/syscall.S:37
+   12   Thread 0xb225c410 (LWP 31083) "MirServerThread" 0xb61da4e2 in poll () at ../sysdeps/unix/syscall-template.S:81
+   11   Thread 0xb18a0410 (LWP 31085) "RPC Thread" 0xb61da4e2 in poll () at ../sysdeps/unix/syscall-template.S:81
+   10   Thread 0xb0eff410 (LWP 31086) "arch_worker" 0xb4422840 in ?? ()
+   9    Thread 0xb2523b40 (LWP 31087) "MirServerThread" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:47
+   8    Thread 0xb04ff410 (LWP 31088) "SWD-GPU Job" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
+   7    Thread 0xafcff410 (LWP 31089) "SWD-Frame" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
+   6    Thread 0xaf301410 (LWP 31090) "Input dispatch" 0xb61da4e2 in poll () at ../sysdeps/unix/syscall-template.S:81
+   5    Thread 0xaeb01410 (LWP 31091) "Mir/Snapshot" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
+   4    Thread 0xae301410 (LWP 31092) "Mir/IPC" 0xb61e1132 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
+   3    Thread 0xadb01410 (LWP 31093) "Mir/IPC" 0xb61e1132 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
+   2    Thread 0xac76d410 (LWP 31094) "unity8" 0xb61d6ae0 in read () at ../sysdeps/unix/syscall-template.S:81
+ * 1    Thread 0xb6f9f000 (LWP 31079) "unity8" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
+ 
+ Thread 2 (Thread 0xac76d410 (LWP 31094)):
+ #0  0xffffffff in read () at ../sysdeps/unix/syscall-template.S:81
+ #1  0xffffffff in SensorController::fifo_take_command() (__nbytes=1, __buf=0xac76cdcf, __fd=<optimized out>) at /usr/include/arm-linux-gnueabihf/bits/unistd.h:44
+ #2  0xffffffff in SensorController::fifo_take_command() (this=0xac7861e8 <SensorController::instance()::_inst>) at /build/platform-api-1_CRAF/platform-api-3.0.1+15.04.20151127/src/ubuntu/application/testbackend/ubuntu_application_sensors.cpp:287
+ #3  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (__closure=0xd46f68)
+     at /build/platform-api-1_CRAF/platform-api-3.0.1+15.04.20151127/src/ubuntu/application/testbackend/ubuntu_application_sensors.cpp:233
+ #4  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (this=0xd46f68) at /usr/include/c++/4.9/functional:1700
+ #5  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (this=0xd46f68) at /usr/include/c++/4.9/functional:1688
+ #6  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (this=0xd46f5c) at /usr/include/c++/4.9/thread:115
+ #7  0xffffffff in std::(anonymous namespace)::execute_native_thread_routine(void*) (__p=<optimized out>) at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:84
+ #8  0xffffffff in start_thread (arg=0x0) at pthread_create.c:335
+ #9  0xffffffff in  () at ../sysdeps/unix/sysv/linux/arm/clone.S:89
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-application-api3-test-dbgsym 3.0.1+15.04.20151127-0ubuntu1 [origin: LP-PPA-ci-train-ppa-service-landing-022]
  Uname: Linux 3.4.67 armv7l
  ApportVersion: 2.17.2-0ubuntu1.3touch1
  Architecture: armhf
  Date: Tue Dec  8 15:08:53 2015
  InstallationDate: Installed on 2015-12-08 (0 days ago)
  InstallationMedia: Ubuntu 15.04 - armhf (20151208-020303)
  SourcePackage: platform-api
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1523926

Title:
  Dummy sensor backend can block

Status in platform-api package in Ubuntu:
  New

Bug description:
  See the attached gdb output, it's likely that the dummy/test sensor
  backend is blocking unity8 startup.

  (gdb) info threads
    Id   Target Id         Frame 
    14   Thread 0xb3781410 (LWP 31081) "unity8" 0xb61e1970 in recvmsg () at ../sysdeps/unix/syscall-template.S:81
    13   Thread 0xb2f81410 (LWP 31082) "unity8" syscall () at ../sysdeps/unix/sysv/linux/arm/syscall.S:37
    12   Thread 0xb225c410 (LWP 31083) "MirServerThread" 0xb61da4e2 in poll () at ../sysdeps/unix/syscall-template.S:81
    11   Thread 0xb18a0410 (LWP 31085) "RPC Thread" 0xb61da4e2 in poll () at ../sysdeps/unix/syscall-template.S:81
    10   Thread 0xb0eff410 (LWP 31086) "arch_worker" 0xb4422840 in ?? ()
    9    Thread 0xb2523b40 (LWP 31087) "MirServerThread" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:47
    8    Thread 0xb04ff410 (LWP 31088) "SWD-GPU Job" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
    7    Thread 0xafcff410 (LWP 31089) "SWD-Frame" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
    6    Thread 0xaf301410 (LWP 31090) "Input dispatch" 0xb61da4e2 in poll () at ../sysdeps/unix/syscall-template.S:81
    5    Thread 0xaeb01410 (LWP 31091) "Mir/Snapshot" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46
    4    Thread 0xae301410 (LWP 31092) "Mir/IPC" 0xb61e1132 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
    3    Thread 0xadb01410 (LWP 31093) "Mir/IPC" 0xb61e1132 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
    2    Thread 0xac76d410 (LWP 31094) "unity8" 0xb61d6ae0 in read () at ../sysdeps/unix/syscall-template.S:81
  * 1    Thread 0xb6f9f000 (LWP 31079) "unity8" __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:46

  Thread 2 (Thread 0xac76d410 (LWP 31094)):
  #0  0xffffffff in read () at ../sysdeps/unix/syscall-template.S:81
  #1  0xffffffff in SensorController::fifo_take_command() (__nbytes=1, __buf=0xac76cdcf, __fd=<optimized out>) at /usr/include/arm-linux-gnueabihf/bits/unistd.h:44
  #2  0xffffffff in SensorController::fifo_take_command() (this=0xac7861e8 <SensorController::instance()::_inst>) at /build/platform-api-1_CRAF/platform-api-3.0.1+15.04.20151127/src/ubuntu/application/testbackend/ubuntu_application_sensors.cpp:287
  #3  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (__closure=0xd46f68)
      at /build/platform-api-1_CRAF/platform-api-3.0.1+15.04.20151127/src/ubuntu/application/testbackend/ubuntu_application_sensors.cpp:233
  #4  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (this=0xd46f68) at /usr/include/c++/4.9/functional:1700
  #5  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (this=0xd46f68) at /usr/include/c++/4.9/functional:1688
  #6  0xffffffff in std::thread::_Impl<std::_Bind_simple<SensorController::SensorController()::<lambda()>()> >::_M_run(void) (this=0xd46f5c) at /usr/include/c++/4.9/thread:115
  #7  0xffffffff in std::(anonymous namespace)::execute_native_thread_routine(void*) (__p=<optimized out>) at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:84
  #8  0xffffffff in start_thread (arg=0x0) at pthread_create.c:335
  #9  0xffffffff in  () at ../sysdeps/unix/sysv/linux/arm/clone.S:89

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-application-api3-test-dbgsym 3.0.1+15.04.20151127-0ubuntu1 [origin: LP-PPA-ci-train-ppa-service-landing-022]
  Uname: Linux 3.4.67 armv7l
  ApportVersion: 2.17.2-0ubuntu1.3touch1
  Architecture: armhf
  Date: Tue Dec  8 15:08:53 2015
  InstallationDate: Installed on 2015-12-08 (0 days ago)
  InstallationMedia: Ubuntu 15.04 - armhf (20151208-020303)
  SourcePackage: platform-api
  UpgradeStatus: No upgrade log present (probably fresh install)

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