Re: Segfault inside wadd_wch_literal() in ncurses v2017-11-11

[Thomas Dickey]

On Tue, Nov 14, 2017 at 09:11:35PM -0500, Genki Sky wrote:
> Like the subject says, getting a segfault in wadd_wch_literal(). Still
> happens in v20171111. A little hard to reproduce, but the quickest way
> I've found is:
> 
>   0. Open ranger [0] in st [1] in X11
>   1. Repeatedly and rapidly increase and decrease the size of the st window
>   2. ncurses segfaults: ranger closes and the terminal needs a reset.
> 
>   [0]: http://ranger.nongnu.org/
>   [1]: https://st.suckless.org/
> 
> According to $(coredumpctl list /usr/bin/python3.6), I've experienced
> this issue 21 times since 2017-10-10, and never before. According to
> my package manager log:
> 
>   [2017-05-13 12:49] [ALPM] reinstalled ranger (1.8.1-1)
>   [2017-07-24 20:53] [ALPM] upgraded python (3.6.1-1 -> 3.6.2-1)
>   [2017-09-10 03:02] [ALPM] upgraded ncurses (6.0+20170527-1 -> 
> 6.0+20170902-1)
>   [2017-10-27 18:15] [ALPM] upgraded ncurses (6.0+20170902-1 -> 
> 6.0+20170902-2)
> 
> So I'm not sure why it started only on 2017-10-10, but by chance.
> 
> A short gdb session with one of the coredumps is as follows:
> 
>   Core was generated by `/usr/bin/python -O /usr/bin/ranger 
> --choosedir=/tmp/tmp.lbPtBf9f8g'.
>   Program terminated with signal SIGSEGV, Segmentation fault.
>   (gdb) bt
>     #0  0x00007f5194b72d19 in wadd_wch_literal (address@hidden, ch=...) at 
> ../ncurses/./widechar/lib_add_wch.c:281
>     #1  0x00007f5194b73058 in wadd_wch_nosync (ch=..., win=0x558e6617ed10) at 
> ../ncurses/./widechar/lib_add_wch.c:316
>     #2  wadd_wch (address@hidden, address@hidden) at 
> ../ncurses/./widechar/lib_add_wch.c:416
>     #3  0x00007f5194b4f9c5 in waddnwstr (win=0x558e6617ed10, 
> str=0x7f51925b1bb0 L"", n=<optimized out>) at 
> ../ncurses/./base/lib_addstr.c:241
>     #4  0x00007f5194d903c0 in ?? () from 
> /usr/lib/python3.6/lib-dynload/_curses.cpython-36m-x86_64-linux-gnu.so

I'm not sure (I've made changes in other areas, but don't see anything
obvious).  I'll see what I can find...

-- 
Thomas E. Dickey <address@hidden>
https://invisible-island.net
ftp://ftp.invisible-island.net

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