Re: Crash when moving full-width glyphs across lines

[Chet Ramey]

On 12/19/19 2:00 PM, Kirill Chibisov wrote:
> I was able to capture the stack trace under gdb. However you should
> probably use the following command in it to repro the issue.
>
> `set disable-randomization off`
>
> The issue happens quite randomly, however the important thing is exit code
> from bash (139). So there's something with memory access, I guess.
>
> (gdb) info stack
> #0  0x00007fe30e6955ba in _rl_col_width (flags=<optimized out>, end=1735628519, 
> start=<optimized out>, str=0x557e988c691a "/こんにち")
>      at /usr/src/debug/sys-libs/readline-8.0_p1-r1/readline-8.0/display.c:3206
> #1  _rl_col_width (str=0x557e988c691a "/こんにち", start=<optimized out>, end=1735628519, 
> flags=<optimized out>)

Well, the values for `end' are obviously suspicious, but you can't really
tell too much from this traceback, especially since other values of
interest are optimized out. The value of `end' is computed in the caller,
from `oe - old'. Since those are pointers into the same string, the value
shouldn't be that far out of whack. The values of `old' and `new' are
helpful, though. I'll see if I can find it.

Chet

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/