udevd crashed with SIGSEGV in _fini()

[Howard Kern]

Binary package hint: udev

There's not really much to say; I was not aware of the reported crash when it happened (in point of fact, I have no idea when the crash did happen). All I know is, by the time I got into Gnome, I had four crash reports waiting, and I have no idea where they came from. I realize that this isn't much use, but I hope that it's at least a little better than nothing.

I'm going to copy-paste this description to the other three bugs, since it's equally true for them.

The following(?) bugs are: bug 99950 (sysklogd) and bug 99951 (acpid).

ProblemType: Crash
Architecture: amd64
Date: Wed Mar 28 01:08:17 2007
Disassembly: 0x0:
DistroRelease: Ubuntu 7.04
ExecutablePath: /sbin/udevd
Package: udev 103-0ubuntu14
PackageArchitecture: amd64
ProcCmdline: /sbin/udevd --daemon
ProcCwd: /
ProcEnviron: PATH=/sbin:/bin:/usr/sbin:/usr/bin
Signal: 11
SourcePackage: udev
Stacktrace:
 #0 0x0000000000000000 in ?? ()
 #1 0x00002af61fccfd73 in ?? () from /lib/libselinux.so.1
 #2 0x00007fff8afe70d0 in ?? ()
 #3 0x00002af61fcdb601 in _fini () from /lib/libselinux.so.1
 #4 0x0000000000000000 in ?? ()
StacktraceTop:
 ?? ()
 ?? () from /lib/libselinux.so.1
 ?? ()
 _fini () from /lib/libselinux.so.1
 ?? ()
Uname: Linux the-nemisis 2.6.20-13-generic #2 SMP Sat Mar 24 23:12:02 UTC 2007 x86_64 GNU/Linux
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:?? ()
?? () from /lib/libselinux.so.1
?? ()
_fini () from /lib/libselinux.so.1
?? ()

[Mike Stroyan (stroyan)]

The crash occurs when the libselinux1 library is trying to do its 'fini' destructor functions when unloading.
It references some thread local storage variables that were statically initialized to NULL.
That first reference fails when it actually tries to allocate the variables.
This patch explicity initializes those variables during the init function, making the fini function work.
It seems that the real defect is in a corner case of the implementation of "__thread" feature.
But changing libselinux1 this way is a practical workaround.

[Laurent Bigonville (bigon)]

Can you still reproduce this bug?

libselinux used here is 1.32-3ubuntu1 which is really (really) old

[Launchpad Janitor (janitor)]

[Expired for libselinux (Ubuntu) because there has been no activity for 60 days.]