Launchpad has imported 9 comments from the remote bug at http://bugs.freedesktop.org/show_bug.cgi?id=16420.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2008-06-18T17:32:52+00:00 Bryce Harrington wrote: Forwarding a Ubuntu bug: https://bugs.edge.launchpad.net/ubuntu/+source/libxcb/+bug/232364 A number of Xubuntu users have been experiencing failures on startup when launching dbus-launch. Backtraces indicate the problem always occurs during a select() call in _xcb_in_read_block. The freezes are intermittently reproducible (i.e., restart several times and eventually it'll come up). (gdb) bt #0 0xb8002424 in __kernel_vsyscall () #1 0xb7e8484d in select () from /lib/tls/i686/cmov/libc.so.6 #2 0xb7da309a in _xcb_in_read_block (c=0x80579a8, buf=0x8057040, len=8) at xcb_in.c:248 #3 0xb7da2343 in xcb_connect_to_fd (fd=13, auth_info=0xbff1cdf0) at xcb_conn.c:133 #4 0xb7da4a51 in xcb_connect (displayname=0x0, screenp=0x0) at xcb_util.c:279 #5 0xb7f43717 in _XConnectXCB () from /usr/lib/libX11.so.6 #6 0xb7f2c029 in XOpenDisplay () from /usr/lib/libX11.so.6 #7 0x0804b3de in x11_init () at dbus-launch-x11.c:218 #8 0x0804abb2 in main (argc=5, argv=0xbff1d5a4) at dbus-launch.c:432 (gdb) quit strace also shows that the hang is occurring on a select call: select(14, [13], NULL, NULL, NULL Reply at: https://bugs.launchpad.net/dbus/+bug/232364/comments/23 ------------------------------------------------------------------------ On 2008-06-18T17:35:41+00:00 Bryce Harrington wrote: Some logs... Xorg.0.log: http://launchpadlibrarian.net/15420742/Xorg.0.log xinitrc: http://launchpadlibrarian.net/15420770/xinitrc lsof: http://launchpadlibrarian.net/15315169/lsof This patch was attempted as a test, but found to make no difference: http://launchpadlibrarian.net/14669590/xcb_in.diff Reply at: https://bugs.launchpad.net/dbus/+bug/232364/comments/24 ------------------------------------------------------------------------ On 2008-06-18T17:56:24+00:00 Cody A.W. Somerville wrote: Hi, I'm the Xubuntu Team Lead. Please let me know if I can do anything to assist in fixing/testing this bug. Cheers, Reply at: https://bugs.launchpad.net/dbus/+bug/232364/comments/25 ------------------------------------------------------------------------ On 2008-06-20T15:00:13+00:00 Bryce Harrington wrote: Created an attachment (id=17263) dbus-launch trace cody-somervi...@mercurial:~$ cat /usr/bin/dbus-launch #!/bin/sh exec /usr/bin/strace /usr/bin/dbus-launch.real "$@" 2> /tmp/dbus- launch.out Reply at: https://bugs.launchpad.net/dbus/+bug/232364/comments/34 ------------------------------------------------------------------------ On 2008-06-20T15:02:45+00:00 Bryce Harrington wrote: Created an attachment (id=17264) strace after killing process Reply at: https://bugs.launchpad.net/dbus/+bug/232364/comments/35 ------------------------------------------------------------------------ On 2008-06-20T15:03:13+00:00 Bryce Harrington wrote: Created an attachment (id=17265) lsof output Reply at: https://bugs.launchpad.net/dbus/+bug/232364/comments/36 ------------------------------------------------------------------------ On 2008-06-20T15:03:52+00:00 Bryce Harrington wrote: Created an attachment (id=17266) fd/pid listing Reply at: https://bugs.launchpad.net/dbus/+bug/232364/comments/37 ------------------------------------------------------------------------ On 2008-06-20T15:10:08+00:00 Bryce Harrington wrote: >From the postkill: [pid 7877] read(20, 0x8056f3c, 4096) = -1 EAGAIN (Resource temporarily unavailable) [pid 7877] ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfd17a18) = -1 ENOTTY (Inappropriate ioctl for device) [pid 7877] select(21, [20], NULL, [20], NULL) = 1 (in [20]) [pid 7877] read(20, "", 4096) = 0 Reply at: https://bugs.launchpad.net/dbus/+bug/232364/comments/38 ------------------------------------------------------------------------ On 2009-10-09T11:10:53+00:00 Jamey-minilop wrote: I can't actually believe this was ever an XCB bug. The strace output posted on the launchpad bug shows that it was waiting for the connection setup response from the X server, and if that never arrived, it's hard to imagine how it could be XCB's fault. I could believe, though, that two instances of dbus-launch somehow deadlocked against each other. Perhaps one calls XGrabServer, then waits for the other one to finish connecting to the X server? The fix that Ubuntu seems to have settled on, if I'm reading the launchpad bug correctly, is to ensure that there aren't two dbus-launch instances racing each other. That seems plausible to me. Reply at: https://bugs.launchpad.net/dbus/+bug/232364/comments/76 ** Changed in: libxcb Status: Invalid => Won't Fix ** Changed in: libxcb Importance: Unknown => Critical -- dbus-launch hangs at session start waiting on socket output in libxcb https://bugs.launchpad.net/bugs/232364 You received this bug notification because you are a member of Registry Administrators, which is the registrant for D-Bus. _______________________________________________ Mailing list: https://launchpad.net/~registry Post to : [email protected] Unsubscribe : https://launchpad.net/~registry More help : https://help.launchpad.net/ListHelp
