Comment 44 for bug 38131

thanks, that's actually useful. you could just delete /<email address hidden>/components/talkback/talkback.so if you want to work around this.

The problem is visible here:
open("/dev/zero", O_RDWR) = -1 EACCES (Permission denied)
mmap2(NULL, 1056768, PROT_READ|PROT_WRITE, MAP_PRIVATE, -1, 0) = -1 EBADF (Bad file descriptor)
close(-1) = -1 EBADF (Bad file descriptor)
--- SIGSEGV (Segmentation fault) @ 0 (0) ---

timeless@boffo:/tmp$ ls -al /dev/zero
crw-rw-rw- 1 root sys 1, 5 1994-07-17 16:46 /dev/zero

I have no idea why your /dev/zero is not writable but i'm fairly certain that's the problem (i'd love confirmation).