adding set -x to check-missing-firmware instead gets me the actual bus error but still doesnt chow what causes the non-linefetch error:

Apr 13 09:15:35 main-menu[240]: INFO: Menu item 'disk-detect' selected
Apr 13 09:15:36 net/hw-detect.hotplug: Detected hotpluggable network interface eth0
Apr 13 09:15:36 net/hw-detect.hotplug: Detected hotpluggable network interface lo
Apr 13 09:15:38 check-missing-firmware: no missing firmware in /tmp/missing-firmware
Apr 13 09:15:39 kernel: [  281.107849] Unhandled fault: external abort on non-linefetch (0x1018) at 0x40200000
Apr 13 09:15:41 kernel: [  283.133270] Unhandled fault: external abort on non-linefetch (0x1018) at 0x40200000
Apr 13 09:15:43 kernel: [  285.158142] Unhandled fault: external abort on non-linefetch (0x1018) at 0x40200000
Apr 13 09:15:46 main-menu[240]: (process:5940): + 
Apr 13 09:15:46 main-menu[240]: (process:5940): LOG=/tmp/missing-firmware
Apr 13 09:15:46 main-menu[240]: (process:5940): 
Apr 13 09:15:46 main-menu[240]: (process:5940): + 
Apr 13 09:15:46 main-menu[240]: (process:5940): DENIED=/tmp/missing-firmware-denied
Apr 13 09:15:46 main-menu[240]: (process:5940): 
Apr 13 09:15:46 main-menu[240]: (process:5940): + 
Apr 13 09:15:46 main-menu[240]: (process:5940): NL=
Apr 13 09:15:46 main-menu[240]: (process:5940): 
Apr 13 09:15:46 main-menu[240]: (process:5940): + 
Apr 13 09:15:46 main-menu[240]: (process:5940): first=1
Apr 13 09:15:46 main-menu[240]: (process:5940): 
Apr 13 09:15:46 main-menu[240]: (process:5940): + 
Apr 13 09:15:46 main-menu[240]: (process:5940): read_log
Apr 13 09:15:46 main-menu[240]: (process:5940): 
Apr 13 09:15:46 main-menu[240]: (process:5940): + 
Apr 13 09:15:46 main-menu[240]: (process:5940): sleep
Apr 13 09:15:46 main-menu[240]: (process:5940):  1
Apr 13 09:15:46 main-menu[240]: (process:5940): 
Apr 13 09:15:46 main-menu[240]: (process:5940): + modules=
Apr 13 09:15:46 main-menu[240]: (process:5940): + files=
Apr 13 09:15:46 main-menu[240]: (process:5940): + [ -s /tmp/missing-firmware ]
Apr 13 09:15:46 main-menu[240]: (process:5940): + [ -n  ]
Apr 13 09:15:46 main-menu[240]: (process:5940): + log no missing firmware in /tmp/missing-firmware
Apr 13 09:15:46 main-menu[240]: (process:5940): + logger -t check-missing-firmware no missing firmware in /tmp/missing-firmware
Apr 13 09:15:46 main-menu[240]: (process:5940): + return 1
Apr 13 09:15:46 main-menu[240]: (process:5940): Bus error
Apr 13 09:15:46 main-menu[240]: (process:5940): Bus error
Apr 13 09:15:46 main-menu[240]: (process:5940): Bus error
Apr 13 09:15:46 main-menu[240]: INFO: Menu item 'disk-detect' succeeded but requested to be left unconfigured.
Apr 13 09:15:46 main-menu[240]: DEBUG: resolver (libnewt0.52): package doesn't exist (ignored)
Apr 13 09:15:46 main-menu[240]: DEBUG: resolver (libgcc1): package doesn't exist (ignored)
Apr 13 09:15:46 main-menu[240]: DEBUG: resolver (ext2-modules): package doesn't exist (ignored)
Apr 13 09:15:46 main-menu[240]: INFO: Falling back to the package description for console-setup-udeb
Apr 13 09:15:48 main-menu[240]: INFO: Falling back to the package description for console-setup-udeb
Apr 13 09:15:48 main-menu[240]: INFO: Menu item 'di-utils-shell' selected