I am having the same problem. On Hardy on x86_64, using 2.6.22-14-generic (2.6.24 has problems with suspend on my machine). It only happens when flashplugin-nonfree is installed, but seems to happen randomly, not necessarily when I'm interacting with flash. X just restarts and I get a login page. My Xorg.0.log.old is attached. I didn't have this problem with Gutsy.
I am having the same problem. On Hardy on x86_64, using 2.6.22-14-generic (2.6.24 has problems with suspend on my machine). It only happens when flashplugin-nonfree is installed, but seems to happen randomly, not necessarily when I'm interacting with flash. X just restarts and I get a login page. My Xorg.0.log.old is attached. I didn't have this problem with Gutsy.
Backtrace: X(xf86SigHandle r+0x6a) [0x48402a] xorg/modules/ /libxaa. so [0x2b7bdd265c9c] xorg/modules/ /libxaa. so [0x2b7bdd265e96] X(Dispatch+ 0x2ef) [0x44eaaf] X(main+ 0x47d) [0x436b9d] so.6(__ libc_start_ main+0xf4) [0x2b7bda1e31c4] X(FontFileCompl eteXLFD+ 0x279) [0x435ed9]
0: /usr/bin/
1: /lib/libc.so.6 [0x2b7bda1f7100]
2: /usr/lib/
3: /usr/lib/
4: /usr/bin/X [0x527ea2]
5: /usr/bin/X [0x515c3f]
6: /usr/bin/
7: /usr/bin/
8: /lib/libc.
9: /usr/bin/