Both crashes have garbage stacks but they appear to have a lot of references to the ATI driver code, so this may be an AMD driver issue and not a Steam problem.
I'm using the latest AMD Catalyst Linux beta driver (14.2). I will uninstall that and install the stable driver and tell you the result.
Looks like you are right. I first installed build-essential dkms etc., then I downloaded AMD Catalyst 14.2 beta driver from support.amd.com and installed it, then I uninstalled that driver using /usr/share/ati/fglrx-uninstall.sh --force, and rebooted. I installed fglrx-driver from Debian testing repos and Steam is working normally.
Nothing extracted yet.
I am trying to install Steam on Debian. I have downloaded steam_latest.deb from the Steam web site and I have installed all of the dependencies. I also tried installing Steam from Debian testing repos with the same result. Something is seriously wrong with the Steam Launcher. Here is my output:
dylan@Dylan-PC:~$ /usr/bin/steam
Running Steam on debian 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(0_client)
Uploading dump (out-of-process) [proxy '']
/tmp/dumps/crash_20140226165301_1.dmp
/home/dylan/.local/share/Steam/steam.sh: line 755: 4966 Segmentation fault $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"
mv: cannot stat ‘/home/dylan/.steam/registry.vdf’: No such file or directory
Installing bootstrap /home/dylan/.local/share/Steam/bootstrap.tar.xz
Reset complete!
Restarting Steam by request...
Running Steam on debian 64-bit
STEAM_RUNTIME has been set by the user to: /home/dylan/.local/share/Steam/ubuntu12_32/steam-runtime
Installing breakpad exception handler for appid(steam)/version(0_client)
Uploading dump (out-of-process) [proxy '']
/tmp/dumps/crash_20140226165302_1.dmp
/home/dylan/.local/share/Steam/steam.sh: line 755: 5093 Segmentation fault $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"
Finished uploading minidump (out-of-process): success = yes
response: CrashID=bp-2020ab0e-a34e-46c4-b857-330252140226
Finished uploading minidump (out-of-process): success = yes
response: CrashID=bp-2943609a-ac6d-4c7d-b145-d9d462140226