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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Deadlock in XCB enabled libX11"
href="https://bugs.freedesktop.org/show_bug.cgi?id=60560">60560</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>xcb@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>Deadlock in XCB enabled libX11
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>xcb@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>spaceduzi@gmail.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>Library
</td>
</tr>
<tr>
<th>Product</th>
<td>XCB
</td>
</tr></table>
<p>
<div>
<pre>OS: Ubuntu 12.04.1
libx11-1.4.99.1
I have a multi-thread application written with XLib which ends in a deadlock on
Ubuntu 12.04.1. The app has worked fine on previous Ubuntu releases (I'm not
sure if there was an XCB enabled libX11).
I noticed the following 2 scenarios:
Thread 2 (Thread 0xb7c64b40 (LWP 23423)):
#0 0xb7e94a27 in poll_for_event (dpy=0x8182498) at ../../src/xcb_io.c:248
#1 0xb7e94bdf in poll_for_response (dpy=0x8182498) at ../../src/xcb_io.c:288
#2 0xb7e95286 in _XReadEvents (dpy=0x8182498) at ../../src/xcb_io.c:423
#3 0xb7e83cf0 in XNextEvent (dpy=0x8182498, event=0xb7c642fc) at
../../src/NextEvent.c:50
#4 0x0804cfba in xwndw_loop (unused=0x0) at ../../../bnns/src/eloop.c:370
#5 0xb7e48d4c in start_thread (arg=0xb7c64b40) at pthread_create.c:308
#6 0xb7d86d3e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
Thread 1 (Thread 0xb7c656c0 (LWP 23422)):
#0 _XReply (dpy=0x8182498, rep=0xbffff548, extra=0, discard=1) at
../../src/xcb_io.c:623
#1 0xb7e7b598 in _XGetWindowAttributes (dpy=0x8182498, w=88080399,
attr=0xbffff5d8) at ../../src/GetWAttrs.c:114
#2 0xb7e7b6e5 in XGetWindowAttributes (dpy=0x8182498, w=88080399,
attr=0xbffff5d8) at ../../src/GetWAttrs.c:149
#3 0x08053dc2 in open_extview_xwndw (width=200, height=200) at
../../../bnns/src/vis.c:561
#4 0x0804a823 in bsh () at ../../../bnns/src/bsh.c:230
#5 0x0804a07e in bsh_init (patterns_path=0xbffffa5a
"/home/uzak/projects/bnns/patterns", log_path=0x805738b "./log",
task_name=0xbffffa82 "spiral", up=0xbffff7c0, cp=0xbffff7b8, eep=0xbffff7bc) at
../../../bnns/src/bsh.c:94
#6 0x0804e2f0 in main (argc=9, argv=0xbffff8c4) at
../../../bnns/src/main.c:299
------------------------------------
Thread 2 (Thread 0xb7c64b40 (LWP 23742)):
#0 0xb7fdd424 in __kernel_vsyscall ()
#1 0xb7d785f0 in __GI___poll (fds=0xb7c641f8, nfds=1, timeout=-1) at
../sysdeps/unix/sysv/linux/poll.c:87
#2 0xb7c7f120 in ?? () from /usr/lib/i386-linux-gnu/libxcb.so.1
#3 0xb7c80da9 in xcb_wait_for_event () from
/usr/lib/i386-linux-gnu/libxcb.so.1
#4 0xb7e952d7 in _XReadEvents (dpy=0x8182498) at ../../src/xcb_io.c:400
#5 0xb7e83cf0 in XNextEvent (dpy=0x8182498, event=0xb7c642fc) at
../../src/NextEvent.c:50
#6 0x0804cfba in xwndw_loop (unused=0x0) at ../../../bnns/src/eloop.c:371
#7 0xb7e48d4c in start_thread (arg=0xb7c64b40) at pthread_create.c:308
#8 0xb7d86d3e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
Thread 1 (Thread 0xb7c656c0 (LWP 23741)):
#0 _XReply (dpy=0x8182498, rep=0xbffff548, extra=0, discard=1) at
../../src/xcb_io.c:623
#1 0xb7e7b598 in _XGetWindowAttributes (dpy=0x8182498, w=88080399,
attr=0xbffff5d8) at ../../src/GetWAttrs.c:114
#2 0xb7e7b6e5 in XGetWindowAttributes (dpy=0x8182498, w=88080399,
attr=0xbffff5d8) at ../../src/GetWAttrs.c:149
#3 0x08053dc2 in open_extview_xwndw (width=200, height=200) at
../../../bnns/src/vis.c:565
#4 0x0804a823 in bsh () at ../../../bnns/src/bsh.c:230
#5 0x0804a07e in bsh_init (patterns_path=0xbffffa5a
"/home/uzak/projects/bnns/patterns", log_path=0x805738b "./log",
task_name=0xbffffa82 "spiral", up=0xbffff7c0, cp=0xbffff7b8, eep=0xbffff7bc) at
../../../bnns/src/bsh.c:94
#6 0x0804e2f0 in main (argc=9, argv=0xbffff8c4) at
../../../bnns/src/main.c:299</pre>
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