As another data point, I have the exact same crash with my Aura One LE using the stock 4.9.11311 firmware and trying to bring up the menu anytime I'm reading a Pocket article. I've already reported this to Kobo support, entertaining them with numerous factory resets in hopes they send my stack trace to their developers to fix. I think Pocket is just borked in 4.9.x, with or without patches.
Code:
OH THE HUMANITY!
pid: 723, tid: 723 (nickel), rev: 112578920cc06e4fafa6cfc0c21a7fcdd976236a
>>> /usr/local/Kobo/nickel <<<
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0171532c
r0 0000008d r1 005c54ca r2 00000004 r3 ab1175e8
r4 0131b138 r5 012e5790 r6 01041384 r7 7ef63898
r8 30202648 r9 2bc9ff80 10 7ef638a4 fp ab6dcab2
ip 2bcb0644 sp 7ef63898 lr 2b4a905b pc 2b4a905c cpsr 200e0030
#00 sp: 0x7ef63898 ip: 0x2b4a905c /usr/local/Kobo/libnickel.so.1.0.0: _ZN12PluginLoader11forMimeTypeERK10QByteArray+0xfb
#01 sp: 0x7ef638e0 ip: 0x2b5e1cff /usr/local/Kobo/libnickel.so.1.0.0: _ZN17BookSearchBuilder9canSearchERK6Volume+0xb6
#02 sp: 0x7ef63908 ip: 0x2b5e95b9 /usr/local/Kobo/libnickel.so.1.0.0: _ZN23SearchInBookActionProxy19populateComboButtonEP11ComboButton+0x14
#03 sp: 0x7ef63930 ip: 0x2b5a3147 /usr/local/Kobo/libnickel.so.1.0.0: _ZN16ActionProxyMixin24setupReadingFooterButtonEP7QObjectRK6VolumeP11ComboButton+0x33e
#04 sp: 0x7ef639c0 ip: 0x2b791ebb /usr/local/Kobo/libnickel.so.1.0.0: _ZN21ReadingMenuController8loadViewEv+0x17e
#05 sp: 0x7ef63a88 ip: 0x2b790225 /usr/local/Kobo/libnickel.so.1.0.0: _ZN21ReadingMenuController10footerViewEv+0x34
#06 sp: 0x7ef63ac8 ip: 0x2b790927 /usr/local/Kobo/libnickel.so.1.0.0: _ZN21ReadingMenuController14updateBackTextEv+0xfa
#07 sp: 0x7ef63af0 ip: 0x2b7905d9 /usr/local/Kobo/libnickel.so.1.0.0: _ZN21ReadingMenuController4showEv+0x28
#08 sp: 0x7ef63b68 ip: 0x2b7836cf /usr/local/Kobo/libnickel.so.1.0.0: _ZN11ReadingView14openFooterMenuEv+0xc6
#09 sp: 0x7ef63b90 ip: 0x2b78038f /usr/local/Kobo/libnickel.so.1.0.0: _ZN11ReadingView6mapTapE6QPointRK5QHashI5QRectMS_FvvEE+0x1f6
...