ALSA - amixer, alsamixer, and xmms segfault

[guidodev]

Greetings,

Amixer, alsamixer, and xmms seem to like segfaulting on my system--I've never been able to get them to work right. Xmms only crashes if media-plugins/alsa-xmms is installed, otherwise it's fine. At least I can alter the volume settings with gnome-volume-control (compiled without USE="alsa" IIRC). Oddly enough, alsaplayer and aplay work just fine and seem to have no issues.

An strace on amixer/alsamixer/xmms yields the following...

<snip>
open("/dev/snd/controlC0", O_RDONLY) = 3
close(3) = 0
open("/dev/snd/controlC0", O_RDWR) = 3
ioctl(3, USBDEVFS_CONTROL, 0xbffff308) = 0
fcntl64(3, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
ioctl(3, USBDEVFS_RELEASEINTERFACE, 0xbffff504) = 0
brk(0x805c000) = 0x805c000
ioctl(3, USBDEVFS_RELEASEINTERFACE, 0xbffff504) = 0
brk(0x805d000) = 0x805d000
brk(0x805e000) = 0x805e000
brk(0x805f000) = 0x805f000
brk(0x8060000) = 0x8060000
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++
</snip>

An strace for aplay/alsaplayer yields something like this:

<snip>
open("/dev/snd/controlC0", O_RDONLY) = 3
close(3) = 0
open("/dev/snd/controlC0", O_RDWR) = 3
ioctl(3, USBDEVFS_CONTROL, 0xbffff018) = 0
ioctl(3, 0x40045532, 0xbffff018) = 0
open("/dev/snd/pcmC0D0p", O_RDWR) = 4
ioctl(4, AGPIOC_INFO, 0xbffff084) = 0
</snip>

Ideas? I've searched all over the place and can find plenty of people asking questions, but no answers...

[guidodev]

It appears that the problem was having grsecurity's non-executable stack option turned on in the kernel. A few days after recompiling the kernel without that option to make wine happy, I noticed that my alsa apps were working properly...go figure.