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I'm using the newest 6.2.A.1.100 software. After about 30 minutes of listening to radio from Jazz Radio , the kernel crashes with a NULL pointer dereference in drivers/mmc/host/mmci.c and the phone reboots. This has already happened twice in a short timeframe, never had this problem before while using other apps.
Here's my /proc/last_kmsg: https://www.dropbox.com/s/8pa1x1pnodolnas/bug.txt
Try re installing the phone software again with Sony Update Service and check.