Actually I think I can see a problem from the stack log: It looks like you have a firmware version mismatch, nickel is version 4.8.11073 but libnickel.so.1.0.0 is version 4.8.11090 or later.
If that is the case then you need to do a factory reset, then check carefully the firmware version on the device information page after the factory reset completes but before patching, and then patch using the exact same firmware version that is on the device.
(Edit: I'm basing this on the stack log:
Quote:
OH THE HUMANITY!
pid: 571, tid: 571 (nickel), rev: b628114af7d11c3c8c52e533d983ce37736de440
>>> /usr/local/Kobo/nickel <<<
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000040
r0 0cb4b660 r1 0000000f r2 00000004 r3 d8001c60
r4 00528618 r5 00528618 r6 0052887c r7 7e8bed00
r8 016e7e60 r9 2bca2fe8 10 7e8bed0c fp d8001c6f
ip 2bcb36f4 sp 7e8bed00 lr 2b480923 pc 2b480924 cpsr 800e0030
#00 sp: 0x7e8bed00 ip: 0x2b480924 /usr/local/Kobo/libnickel.so.1.0.0: _ZN12PluginLoader11forMimeTypeERK10QByteArray+0xfb
#01 sp: 0x7e8bed48 ip: 0x2b5bdf17 /usr/local/Kobo/libnickel.so.1.0.0: _ZN17BookSearchBuilder9canSearchERK6Volume+0xb6
#02 sp: 0x7e8bed70 ip: 0x2b5c54cd /usr/local/Kobo/libnickel.so.1.0.0: _ZN23SearchInBookActionProxy19populateComboButtonE P11ComboButton+0x14
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b628114af7d11c3c8c52e533d983ce37736de440 is the build number for firmware 4.8.11073, but the function
_ZN12PluginLoader11forMimeTypeERK10QByteArray didn't exist in libnickel until version 4.8.11090.)