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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: util-linux-2.23 mount segmentation fault error
Date: Wed, 29 May 2013 22:04:53 +0200
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* plan9assembler <plan9assembler@gmail.com> [2013-05-29 23:41:13 +0900]:
> util-linux umount gets segfaults randomly..(X)
> util-linux umount gets segfaults always..(O)
> 
> # ./umount /mnt
> traps: umount[9444] general protection ip:7f9c48e618fb sp:7fff72447b88
> error:0 in libc.so[7f9c48e16000+72000]
> Segmentation fault.

it seems util-linux uses sscanf with %ms to parse mtab
in libmount in tab_parse.c

after i fixed that mount and umount does not segfault here
(used fixed size malloc and %s instead)