Chiming in to say I have this same issue, also on Arch (running the testing 4.8 kernel) on an R9 380. Using amdgpu-pro (as provided on the AUR). I also have the steam-native package but that has no effect.
Running Steam on arch rolling 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(0)
crash_20161021110757_1.dmp[2511]: Uploading dump (out-of-process)
/tmp/dumps/crash_20161021110757_1.dmp
/home/tower/.local/share/Steam/steam.sh: line 756: 2508 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$STEAMEXEPATH" "$@"
crash_20161021110757_1.dmp[2511]: Finished uploading minidump (out-of-process): success = yes
crash_20161021110757_1.dmp[2511]: response: CrashID=bp-4e6f1793-74c4-4227-88cd-572f52161021
crash_20161021110757_1.dmp[2511]: file ''/tmp/dumps/crash_20161021110757_1.dmp'', upload yes: ''CrashID=bp-4e6f1793-74c4-4227-88cd-572f52161021''
Hello @mikel212, @TowerRaven, are either of you still experiencing this issue on an up to date system?
old. switched to open source drivers haven't had that problem again.
Nothing extracted yet.
Your system information
Running Steam on arch rolling 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(0)
crash_20161016164059_1.dmp[3129]: Uploading dump (out-of-process)
/tmp/dumps/crash_20161016164059_1.dmp
/home/kelo/.local/share/Steam/steam.sh: line 756: 3126 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$STEAMEXEPATH" "$@"
crash_20161016164059_1.dmp[3129]: Finished uploading minidump (out-of-process): success = yes
crash_20161016164059_1.dmp[3129]: response: CrashID=bp-2c5a6a88-fe30-4c8b-a7b4-3ea6b2161016
crash_20161016164059_1.dmp[3129]: file ''/tmp/dumps/crash_20161016164059_1.dmp'', upload yes: ''CrashID=bp-2c5a6a88-fe30-4c8b-a7b4-3ea6b2161016''
i've tried deleting and downloading steam again
Steps for reproducing this issue: