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Old 08-08-2013, 09:51 AM   #1
Gullible Jones
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Registered: Apr 2011
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[SOLVED] Occasional Xorg segfaults on Xen dom0


I've managed to work around most of my earlier Xen dom0 issues by setting a fixed dom0 memory size and disabling VT switching in X. However, X still segfaults on startup about a half of the times I try to start it (or XDM tries to start it).

Here is the stack trace from the Xorg log. Note (again) that I cannot use the proprietary firmware required for KMS.

Code:
[    19.081] (--) Depth 24 pixmap format is 32 bpp
[    19.081] (II) RADEON(0): RADEONScreenInit d0000000 0 0
[    19.134] 
[    19.134] Backtrace:
[    19.176] 0: /usr/bin/X (xorg_backtrace+0x36) [0x7f9be158dd06]
[    19.176] 1: /usr/bin/X (0x7f9be140f000+0x182859) [0x7f9be1591859]
[    19.176] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f9be0737000+0xf030) [0x7f9be0746030]
[    19.176] 3: /usr/lib/x86_64-linux-gnu/libpciaccess.so.0 (0x7f9be0953000+0x5018) [0x7f9be0958018]
[    19.176] 4: /usr/lib/xorg/modules/libvgahw.so (0x7f9bdcd5a000+0x261a) [0x7f9bdcd5c61a]
[    19.176] 5: /usr/lib/xorg/modules/libvgahw.so (vgaHWUnlock+0x23) [0x7f9bdcd5eeb3]
[    19.176] 6: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f9bdd16d000+0x4528d) [0x7f9bdd1b228d]
[    19.176] 7: /usr/bin/X (AddScreen+0x189) [0x7f9be14621f9]
[    19.177] 8: /usr/bin/X (InitOutput+0x28e) [0x7f9be14a03fe]
[    19.177] 9: /usr/bin/X (0x7f9be140f000+0x41d26) [0x7f9be1450d26]
[    19.177] 10: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xfd) [0x7f9bdf45eead]
[    19.177] 11: /usr/bin/X (0x7f9be140f000+0x4219d) [0x7f9be145119d]
[    19.177] 
[    19.177] Segmentation fault at address (nil)
[    19.177] 
Fatal server error:
[    19.177] Caught signal 11 (Segmentation fault). Server aborting
Any ideas what the problem might be? This is not critical, as X is now stable enough to use once successfully started; but it is annoying.

Last edited by Gullible Jones; 08-21-2013 at 08:51 AM.
 
Old 08-21-2013, 08:50 AM   #2
Gullible Jones
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Solved. Had to disable all hardware acceleration in xorg.conf, X11 now starts up the first time without segfaulting.
 
  


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