Bug 47053

Thread 4 Crashed:
0   libsystem_kernel.dylib        	0x00007fff880b1ce2 __pthread_kill + 10
1   libsystem_c.dylib             	0x00007fff828ff7d2 pthread_kill + 95
2   libsystem_c.dylib             	0x00007fff828f0a7a abort + 143
3   libsystem_c.dylib             	0x00007fff829235de __assert_rtn + 146
4   X11.bin                       	0x000000010005270b 
SecurityAuthorizationExpired + 107
5   X11.bin                       	0x00000001000ffea1 TimerSet + 186
6   X11.bin                       	0x00000001000525db 
SecurityStartAuthorizationTimer + 68
7   X11.bin                       	0x0000000100052493 
ProcSecurityGenerateAuthorization + 564
8   X11.bin                       	0x00000001000bc5d6 Dispatch + 257
9   X11.bin                       	0x000000010002717e dix_main + 185
10  X11.bin                       	0x0000000100011b73 server_thread + 38
11  libsystem_c.dylib             	0x00007fff828fd8bf _pthread_start + 335
12  libsystem_c.dylib             	0x00007fff82900b75 thread_start + 13

Yes, it is very specific to the Mac OS X. And thus, is it strange that it could be linked to a freedesktop bug but I can confirm that it is very annoying problem. We have to close the ssh terminal and restart a new one because you can't open, after the timeout delay, any X window like emacs or whatever software.

Is this a duplicate of bug #27134 ?

I am unable to access bug 27134's description due to permission issues.

FYI: I can't see the linked bug either, but I reproduced this on Debian GNU/Linux (amd64), so its not specific to Mac OS X. There wasn't anything useful in the X log.

Sorry, I lost the version number of the server that was running at the time.

jk.  are you saying i have to wait 597 hours to replicate the issue ?

I managed to inadvertently & instantly crash the X server by using xauth with a "large" timeout.
I used a binary search to find the exact value that causes the crash, which is shown below.
To still have a usable environment for debugging, I used xvfb-run to create a new display before fiddling (whenever the fatal error occurs, the server doesn't respond to messages to DISPLAY, and I had to create a new display by passing a new value to xvfb-run).


# Create a new display, :86 and log errors to /tmp/errors.
$ xvfb-run -e /tmp/errors -n 86 bash

# This is a new (Bash) shell. Create an authorization file and then use xauth.
# All is fine with 2147483...
$ foo=/tmp/xauthfile$DISPLAY; truncate -s 0 $foo ; xauth -f $foo generate $DISPLAY . untrusted timeout 2147483

# When I use 2147484, the server crashes.
$ foo=/tmp/xauthfile$DISPLAY; truncate -s 0 $foo ; xauth -f $foo generate $DISPLAY . untrusted timeout 2147484
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":86"
      after 11 requests (11 known processed) with 0 events remaining.

# Well, since $DISPLAY (= :86) is unusable, exit the subshell. For some reason, Xvfb crashes upon exit. 
$ exit
/usr/bin/xvfb-run: line 170:  4393 Aborted                 (core dumped) XAUTHORITY=$AUTHFILE Xvfb ":$SERVERNUM" $XVFBARGS $LISTENTCP >> "$ERRORFILE" 2>&1
/usr/bin/xvfb-run: line 175: kill: (4393) - No such process

# This is the cause of the crash, some assertion failure...
$ cat /tmp/errors
xauth:  file /tmp/xvfb-run.UyS843/Xauthority does not exist
Xvfb: security.c:300: SecurityAuthorizationExpired: Assertion `pAuth->timer == timer' failed.

OS: ArchLinux.
Xorg-server version: 1.18.1 (built using https://projects.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD?h=packages/xorg-server&id=ebc54a20f035357845ce082c6023c39fa792fc9b)

-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/xorg/xserver/issues/421.