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Re: Unexpected (?) segfault after unset LANG


From: mike b
Subject: Re: Unexpected (?) segfault after unset LANG
Date: Fri, 9 Feb 2018 17:53:44 +0100

Indeed, with build from devel it doesn't segfault anymore. Just out of pure
curiosity, which commit introduced a fix for that? Aaand, there's one more
thing that puzzles me a bit:

# echo $BASH_VERSION
5.0.12(1)-alpha
# echo ${LANG:-bleh}
bleh
# LANG=UTF-8
# printf '%s\n' $'\u013b'
Ļ
# unset LANG
# : # \o/ no segfaults
# printf '%s\n' $'\u013b'
\u013B
# LANG=UTF-8
# printf '%s\n' $'\u013b'
\u013B # why it returns just the code?
bash-5.0#

When LANG is set to UTF-8, printf returns actual character which coresponds
to given code after first call, however, after LANG is toggled, printf
keeps returning just the code. I guess my question here is: why that
happens? I mean, I would expect it to decode it whenever LANG is set back
to UTF-8 in this case. Am I missing something here?

2018-02-09 17:29 GMT+01:00 Chet Ramey <address@hidden>:

> On 2/9/18 11:21 AM, mike b wrote:
> > Core was generated by `bash'.
> > Program terminated with signal SIGSEGV, Segmentation fault.
> > #0  __gconv_close (cd=0x0) at gconv_close.c:35
> > 35    gconv_close.c: No such file or directory.
> > (gdb) bt
> > #0  __gconv_close (cd=0x0) at gconv_close.c:35
> > #1  0x00007fbf1e17a59f in iconv_close (cd=<optimized out>) at
> iconv_close.c:35
> > #2  0x00000000004964d0 in u32reset ()
> > #3  0x000000000046de67 in ?? ()
> > #4  0x000000000043b403 in sv_locale ()
> > #5  0x000000000043e53d in makunbound ()
> > #6  0x0000000000481d45 in unset_builtin ()
> > #7  0x00000000004327aa in ?? ()
> > #8  0x00000000004349d4 in ?? ()
> > #9  0x0000000000435b1b in execute_command_internal ()
> > #10 0x000000000043737e in execute_command ()
> > #11 0x00000000004213be in reader_loop ()
> > #12 0x000000000041fca5 in main ()
> > (gdb)
>
> Thanks. I'm pretty sure this is the problem I fixed last November. The fix
> is in the devel branch if you want to try that.
>
> --
> ``The lyf so short, the craft so long to lerne.'' - Chaucer
>                  ``Ars longa, vita brevis'' - Hippocrates
> Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/
>


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