Segmentation fault when setting tmux pane title

[naggie]

Using the command printf "\\033k%s\\033\\\\" title_goes_here causes a segmentation fault if called from within fish_prompt.

I know that's not the best way of setting the tmux title. I have now done it properly with a hook on PWD variable change, which worked around it: https://github.com/naggie/dotfiles/commit/23467225fcaf4d06f9aa01d9121bb7620da5a7dc

Even though this is not correct use of fish, it might reveal the underlying cause.

I can replicate this on Mac OS X Mountain lion + fish 2.0.0 and Ubuntu 12.04 (64-bit) + fish 2.0.0
.
Thanks for developing fish. It's amazing!

[ridiculousfish]

Wow, nice find!

[ridiculousfish]

(lldb) bt
* thread #1: tid = 0x1c03, 0x00007fff935f9fe6 libsystem_c.dylib`wcslen + 4, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x00007fff935f9fe6 libsystem_c.dylib`wcslen + 4
    frame #1: 0x00007fff927a4c58 libstdc++.6.dylib`std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >::compare(wchar_t const*) const + 32
    frame #2: 0x000000010002ebfd lfish`bool std::operator==<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >(__lhs=0x0000000000000000, __rhs=0x00007fff5fbfe860) + 29 at basic_string.h:2165
    frame #3: 0x000000010002da21 lfish`calc_prompt_layout(prompt=0x00000001010021c8) + 1409 at screen.cpp:292
    frame #4: 0x000000010002b85a lfish`compute_layout(s=0x000000010020dd18, screen_width=80, left_prompt_str=0x000000010020e068, right_prompt_str=0x000000010020e070, commandline=0x00007fff5fbfec70, autosuggestion_str=0x00007fff5fbfec68, indent=0x0000000101000950) + 186 at screen.cpp:1070
    frame #5: 0x000000010002b2e5 lfish`s_write(s=0x000000010020dd18, left_prompt=0x000000010020e068, right_prompt=0x000000010020e070, commandline=0x00007fff5fbfed68, explicit_len=0, colors=0x0000000101002090, indent=0x0000000101000950, cursor_pos=0) + 549 at screen.cpp:1246
    frame #6: 0x00000001000a2cb4 lfish`reader_repaint() + 452 at reader.cpp:532
    frame #7: 0x00000001000a4b8d lfish`reader_readline() + 205 at reader.cpp:2858
    frame #8: 0x00000001000a8e69 lfish`read_i() + 585 at reader.cpp:2740
    frame #9: 0x00000001000a8bbe lfish`reader_read(fd=0, io=0x00007fff5fbff8e0) + 94 at reader.cpp:3764
    frame #10: 0x00000001000c9eec lfish`main(argc=1, argv=0x00007fff5fbff980) + 668 at fish.cpp:485
    frame #11: 0x0000000100001554 lfish`start + 52

[ridiculousfish]

Fixed as 220e1e8
Thanks for reporting this!

[naggie]

No problem :)
That was fast, cheers