Re: segmentation fault trying to use Pan 0.146: "strftime_l.c no such file or directory"

On 2019-12-01 14:07, Julien Michielsen wrote:
> I compiled and installed the latest Pan because I continued
> to get a segmentation fault with the "standard Pan 0.144"
> that came with Ubuntu 18.0.4.  No help: I still get the same
> error message, with the same announcement.  I ran the program
> under gdb and got the following output:
> 
> Starting program: /usr/local/bin/pan
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> [New Thread 0x7fffec030700 (LWP 11360)]
> [New Thread 0x7fffeb82f700 (LWP 11361)]
> [New Thread 0x7fffeb02e700 (LWP 11362)]
> [New Thread 0x7fffea82d700 (LWP 11363)]
> [New Thread 0x7fffe93b9700 (LWP 11364)]
> [New Thread 0x7fffe8bb8700 (LWP 11365)]
> [New Thread 0x7fffd3fff700 (LWP 11366)]
> [New Thread 0x7fffd37fe700 (LWP 11367)]
> [Thread 0x7fffd37fe700 (LWP 11367) exited]
> [Thread 0x7fffd3fff700 (LWP 11366) exited]
> 
> Thread 1 "pan" received signal SIGSEGV, Segmentation fault.
> __strftime_internal (s=0x7fffffffbb30 "@\033\271\365\377\177", maxsize=100, format=0x0, tp=0x7fffffffbaf0,
>      tzset_called=tzset_called@entry=0x7fffffffba97, loc=0x7ffff5b95560 <_nl_global_locale>) at strftime_l.c:560
> 560    strftime_l.c: No such file or directory.
> 
> I also asked for a backtrace, and got the output from it,
> but don't think this is usefull for this list.

I don't know why it wouldn't be - I don't think there is a dedicated
"developer" list.

> If this output
> would be welcome to someone, I'll be happy to supply it.

Please do. The crash is likely caused by the 'format=0x0' argument, it
should be (a pointer to) a format string for strftime_l(), see the
strftime(3) man page. The full backtrace might explain how this came
about.

> I looked if the file strftime_l.c resides on my computer, but
> it doesn't.

This isn't the problem, it's just gdb that tries to print out the
relevant source code lines, and reports that it can't since you don't
have the source (in a place where gdb can find it). I googled
strftime_l.c, and the first hit was a glibc version at
https://code.woboq.org/userspace/glibc/time/strftime_l.c.html - and it
seems it is even the right version (probably doesn't change much),
line 560 is:

   for (f = format; *f != '\0'; ++f)

This will indeed cause a segfault due to the *f dereference if format
is 0/NULL.

> Does anyone have a hint how to get this running?

Not me - FWIW, Pan 0.145 works fine for me on FreeBSD. It may be
something specific to your environment. Does it crash immediately on
startup, i.e. doesn't even display a window? If not, how far does it
get?

--Per Hedeland

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