Bug#435186: xorg: Crash

[Piotr Kaczuba <pepe@attika.ath.cx>]

I had the following error message:

Backtrace:
0: /usr/bin/X(xf86SigHandler+0x81) [0x80c8631]
1: [0xffffe500]

Fatal server error:
Caught signal 11.  Server aborting

No mention of nvidia. Although I do use the nvidia proprietary driver.
Downgrading to udev 0.105-4 solved the problem.

A strace of X revealed the reason for the crash:

> 13597 open("/dev/zero", O_RDWR)         = 19
> 13597 mmap2(NULL, 8192, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 19, 0x2000) = -1 EPERM (Operation not permitted)
> 13597 close(19)                         = 0
> 13597 --- SIGSEGV (Segmentation fault) @ 0 (0) ---

With udev 0.105-4 the mmap succeeds.
The reason for EPERM is that the mmap call specifies PROT_EXEC but since
udev 0.113-1 /dev is mounted with the noexec mount option.

Piotr