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[Michael Mess <764621@xxxxxxxxxxxxxxxxxx>]

Today again: The plugin-container was stopped again and firefox was waiting for it forever...
... until I attached strace to each process and killed the plugin-container process with SIGKILL, 
letting the other processes resume and exit normally.
The resulting strace logs may give a hint, where firefox is waiting for the stopped process.

 7284 ?        Sl     0:28 /usr/lib/firefox-3.6.24/firefox-bin
 7320 ?        Tl     0:00  \_ /usr/lib/firefox-3.6.24/plugin-container /usr/lib

michael@quad:~$ pstree -p 7284
firefox-bin(7284)─┬─plugin-containe(7320)───{plugin-contain}(7321)
                  ├─{firefox-bin}(7294)
                  ├─{firefox-bin}(7295)
                  ├─{firefox-bin}(7316)
                  └─{firefox-bin}(7319)

michael@quad:~$ kill -9 7320

michael@quad:~$ strace -p 7284
Process 7284 attached - interrupt to quit
futex(0x9e6fabd8, FUTEX_WAIT, 7319, NULL) = 0
munmap(0xb36ff000, 8392704)             = 0
writev(14, [{"GIOP\1\2\1\5\0\0\0\0", 12}], 1) = 12
close(14)                               = 0
writev(12, [{"GIOP\1\2\1\5\0\0\0\0", 12}], 1) = 12
close(12)                               = 0
close(9)                                = 0
close(8)                                = 0
unlink("/tmp/orbit-michael/linc-1c74-0-506155318a2b") = 0
close(13)                               = 0
close(73)                               = 0
exit_group(0)                           = ?
Process 7284 detached

michael@quad:~$ strace -p 7319
Process 7319 attached - interrupt to quit
waitpid(7320, NULL, __WALL)             = ? ERESTARTSYS (To be restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(7320, NULL, __WALL)             = 7320
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_ATTACH, 7321, 0, 0)       = -1 ESRCH (No such process)
ftruncate(34, 0)                        = 0
close(34)                               = 0
ptrace(PTRACE_DETACH, 7320, 0, SIG_0)   = -1 ESRCH (No such process)
ptrace(PTRACE_DETACH, 7321, 0, SIG_0)   = -1 ESRCH (No such process)
munmap(0xb4012000, 4096)                = 0
munmap(0xb4013000, 4096)                = 0
munmap(0xb4400000, 4096)                = 0
munmap(0xb4401000, 4096)                = 0
munmap(0xb4402000, 4096)                = 0
munmap(0xb4403000, 4096)                = 0
munmap(0xb4404000, 4096)                = 0
munmap(0xb4405000, 4096)                = 0
munmap(0xb4406000, 4096)                = 0
munmap(0xb4407000, 4096)                = 0
munmap(0xb4408000, 4096)                = 0
munmap(0xb4409000, 4096)                = 0
munmap(0xb440a000, 4096)                = 0
munmap(0xb4f00000, 4096)                = 0
munmap(0xb4f01000, 4096)                = 0
munmap(0xb4f02000, 4096)                = 0
munmap(0xb4f03000, 4096)                = 0
munmap(0xb4f04000, 4096)                = 0
munmap(0xb4f05000, 4096)                = 0
munmap(0xb4f06000, 4096)                = 0
munmap(0xb5200000, 4096)                = 0
munmap(0xb5201000, 4096)                = 0
munmap(0xb5202000, 4096)                = 0
munmap(0xb7400000, 4096)                = 0
munmap(0xb7401000, 4096)                = 0
munmap(0xb7700000, 4096)                = 0
munmap(0xb7825000, 4096)                = 0
close(27)                               = 0
poll([{fd=88, events=POLLIN}, {fd=89, events=POLLIN}], 2, -1) = 1 ([{fd=89, revents=POLLIN}])
read(89, "x", 1)                        = 1
madvise(0x9defa000, 8372224, MADV_DONTNEED) = 0
_exit(0)                                = ?
Process 7319 detached

michael@quad:~$ strace -p 7295
...
gettimeofday({1327468717, 610700}, NULL) = 0
futex(0xb73a6160, FUTEX_WAKE_PRIVATE, 1) = 0
clock_gettime(CLOCK_REALTIME, {1327468717, 610788963}) = 0
futex(0xb739f648, FUTEX_WAIT_PRIVATE, 6121, {0, 999911037}) = -1 ETIMEDOUT (Connection timed out)
gettimeofday({1327468718, 610896}, NULL) = 0
futex(0xb73a6160, FUTEX_WAKE_PRIVATE, 1) = 0
clock_gettime(CLOCK_REALTIME, {1327468718, 610988319}) = 0
futex(0xb739f648, FUTEX_WAIT_PRIVATE, 6123, {0, 999907681}) = -1 ETIMEDOUT (Connection timed out)
gettimeofday({1327468719, 611088}, NULL) = 0
futex(0xb73a6160, FUTEX_WAKE_PRIVATE, 1) = 0
clock_gettime(CLOCK_REALTIME, {1327468719, 611178253}) = 0
futex(0xb739f648, FUTEX_WAIT_PRIVATE, 6125, {0, 999909747}PANIC: attached pid 7295 exited with 0
 <unfinished ... exit status 0>

michael@quad:~$ strace -p 7316
Process 7316 attached - interrupt to quit
restart_syscall(<... resuming interrupted call ...>PANIC: attached pid 7316 exited with 0
 <unfinished ... exit status 0>

michael@quad:~$ strace -p 7294
Process 7294 attached - interrupt to quit
futex(0xb739f608, FUTEX_WAIT_PRIVATE, 65, NULL) = ? <unavailable>
PANIC: attached pid 7294 exited with 0

-- 
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Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/764621

Title:
  /usr/lib/firefox-4.0/plugin-container hangs upon Firefox exit, which
  prevents computer shutdown from GNOME

Status in “firefox” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: firefox

  Every time I exit Firefox before rebooting this host running a classic
  GNOME session, it hangs there, effectivel preventing the reboot from
  taking place unless Firefox is first force-killed. The cause seems to
  be that Firefox's plugin container has a dozen of Gnash sub-processes
  that won't terminate.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: firefox 4.0+nobinonly-0ubuntu2
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  Architecture: i386
  Date: Mon Apr 18 16:21:00 2011
  FirefoxPackages:
   firefox 4.0+nobinonly-0ubuntu2
   flashplugin-installer N/A
   adobe-flashplugin N/A
   icedtea-plugin N/A
  ProcEnviron:
   LANGUAGE=fi_FI:fi_FI.UTF-8:fi
   PATH=(custom, user)
   LANG=fi_FI.UTF-8
   SHELL=/bin/bash
  SourcePackage: firefox
  UpgradeStatus: Upgraded to natty on 2009-09-14 (581 days ago)

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