[xorg] Problem with sna/xcomposite? (i915 video driver related)

[animelovin at gmail.com]

Hi,

After upgrade to intel-xorg-video 2.21.4 driver, (Intel 945GM chipset) xserver 1.12.4 crash repeatingly
with sna enabled in xorg.conf. 

A workaround i found is to fall back on "uxa" until the issue is resolve in upstream. Backtrace:

[   596.654] Backtrace:
[   596.654] 0: /usr/bin/X (xorg_backtrace+0x49) [0x81af349]
[   596.654] 1: /usr/bin/X (0x8048000+0x16abb6) [0x81b2bb6]
[   596.654] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb774940c]
[   596.654] 3: /usr/local/lib/xorg/modules/drivers/intel_drv.so (0xb7105000+0xb2d10) [0xb71b7d10]
[   596.654] 4: /usr/local/lib/xorg/modules/drivers/intel_drv.so (0xb7105000+0x85158) [0xb718a158]
[   596.655] 5: /usr/local/lib/xorg/modules/drivers/intel_drv.so (0xb7105000+0x85879) [0xb718a879]
[   596.655] 6: /usr/local/lib/xorg/modules/drivers/intel_drv.so (0xb7105000+0x92f52) [0xb7197f52]
[   596.655] 7: /usr/bin/X (CompositeTrapezoids+0xab) [0x812d50b]
[   596.655] 8: /usr/bin/X (0x8048000+0xeae30) [0x8132e30]
[   596.655] 9: /usr/bin/X (0x8048000+0xe59ce) [0x812d9ce]
[   596.655] 10: /usr/bin/X (0x8048000+0x32895) [0x807a895]
[   596.655] 11: /usr/bin/X (0x8048000+0x20655) [0x8068655]
[   596.655] 12: /lib/i386-linux-gnu/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0xb7410e46]
[   596.656] 13: /usr/bin/X (0x8048000+0x20999) [0x8068999]
[   596.656] 
[   596.656] Bus error at address 0xb5054000
[   596.656] 
Fatal server error:
[   596.656] Caught signal 7 (Bus error). Server aborting
[   596.656] 
[   596.656] 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
[   596.656] Please also check the log file at "/var/log/Xorg.0.log" for additional information.

Can this bug please be checked by a upstream maintainer? I believe even with --disable-composite compile
time option the xserver experiment severe bus errors.

xserver config:
 ./configure --prefix=/usr/local --disable-composite --enable-dri --enable-dri2 --enable-libdrm --enable-xorg --disable-debug --disable-maintainer-mode --disable-ipv6 --localstatedir=/var --sysconfdir=/etc


Regards,
Etienne