Subject: bug#18671: Bug#726131: emacs24: Emacs 24 crashed (segmentation fault) in getenv.c from libX11/_XkbGetCharset

From: Rob Browning <[email-masked]>
Date: Thu, 09 Oct 2014 11:18:31 -0500

[If possible, please preserve the -forwarded address in any replies.]

Here's another 24.3 crash report:

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=726131

Vincent Lefevre <[email-masked]> writes:

> Package: emacs24
> Version: 24.3+1-2
> Severity: important
>
> Just after Emacs 24 was started, it crashed. In the terminal:
>
> Fatal error 11: Segmentation fault
> Backtrace:
> emacs[0x4f75fb]
> emacs[0x4dd0ae]
> emacs[0x4f624e]
> emacs[0x4f63b3]
> /lib/x86_64-linux-gnu/libpthread.so.0(+0xf210)[0x7ff66e728210]
> /lib/x86_64-linux-gnu/libc.so.6(getenv+0xac)[0x7ff66e3a614c]
> /usr/lib/x86_64-linux-gnu/libX11.so.6(_XkbGetCharset+0xd)[0x7ff6718e6aad]
> /usr/lib/x86_64-linux-gnu/libX11.so.6(XkbTranslateKeySym+0x1e2)[0x7ff6718e5252]
> /usr/lib/x86_64-linux-gnu/libX11.so.6(XLookupString+0x1f8)[0x7ff6718e54f8]
> /usr/lib/x86_64-linux-gnu/libX11.so.6(_XimLocalFilter+0x5a)[0x7ff6718bf3fa]
> emacs[0x4ba220]
> /usr/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x4bd81)[0x7ff67366fd81]
> /usr/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x4c00e)[0x7ff67367000e]
> /usr/lib/x86_64-linux-gnu/libgdk-3.so.0(gdk_display_get_event+0x68)[0x7ff673644fd8]
> /usr/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x4be02)[0x7ff67366fe02]
> /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x146)[0x7ff671ffcea6]
> /lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x481f8)[0x7ff671ffd1f8]
> /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x2c)[0x7ff671ffd29c]
> /usr/lib/x86_64-linux-gnu/libgtk-3.so.0(gtk_main_iteration+0x15)[0x7ff673a344f5]
> emacs[0x4b2492]
> emacs[0x4e4491]
> emacs[0x4e3e75]
> emacs[0x594ef2]
> emacs[0x5500af]
> emacs[0x5511bc]
> emacs[0x5500af]
> emacs[0x584a5b]
> emacs[0x54fbaf]
> emacs[0x54febb]
> emacs[0x5511bc]
> emacs[0x5500af]
> emacs[0x584a5b]
> emacs[0x54fbaf]
> emacs[0x54febb]
> emacs[0x5511bc]
> emacs[0x5500af]
> emacs[0x584a5b]
> emacs[0x54fbaf]
> emacs[0x54febb]
> emacs[0x584a5b]
> emacs[0x54f565]
> ...
> Segmentation fault (core dumped)
>
> $ gdb /usr/bin/emacs24-x core
> GNU gdb (GDB) 7.6.1 (Debian 7.6.1-1)
> [...]
> Core was generated by `emacs svn-commit.tmp'.
> Program terminated with signal 11, Segmentation fault.
> #0  0x00007ff66e7280eb in raise (sig=11)
>     at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:38
> 38      ../nptl/sysdeps/unix/sysv/linux/pt-raise.c: No such file or directory.
> (gdb) bt full
> #0  0x00007ff66e7280eb in raise (sig=11)
>     at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:38
>         resultvar = 0
>         pid = <optimized out>
> #1  0x00000000004dd0d6 in ?? ()
> No symbol table info available.
> #2  0x00000000004f624e in ?? ()
> No symbol table info available.
> #3  0x00000000004f63b3 in ?? ()
> No symbol table info available.
> #4  <signal handler called>
> No locals.
> #5  __GI_getenv (name=0x7ff67197065a "KB_CHARSET") at getenv.c:89
>         ep_start = <error reading variable ep_start (Cannot access memory at address 0x7ff600000000)>
>         len = 10
>         ep = 0x7fff3c1ba128
>         name_start = 22623
> #6  0x00007ff6718e6aad in _XkbGetCharset ()
>    from /usr/lib/x86_64-linux-gnu/libX11.so.6
> No symbol table info available.
> #7  0x00007ff6718e5252 in XkbTranslateKeySym ()
>    from /usr/lib/x86_64-linux-gnu/libX11.so.6
> No symbol table info available.
> #8  0x00007ff6718e54f8 in XLookupString ()
>    from /usr/lib/x86_64-linux-gnu/libX11.so.6
> No symbol table info available.
> #9  0x00007ff6718bf3fa in _XimLocalFilter ()
>    from /usr/lib/x86_64-linux-gnu/libX11.so.6
> No symbol table info available.
> #10 0x00000000004ba220 in ?? ()
> No symbol table info available.
> #11 0x00007ff67366fd81 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
> No symbol table info available.
> #12 0x00007ff67367000e in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
> No symbol table info available.
> #13 0x00007ff673644fd8 in gdk_display_get_event ()
>    from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
> No symbol table info available.
> #14 0x00007ff67366fe02 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
> No symbol table info available.
> #15 0x00007ff671ffcea6 in g_main_dispatch (context=0xe34f00)
>     at /tmp/buildd/glib2.0-2.36.4/./glib/gmain.c:3054
>         dispatch = 0x7ff67366fdf0
>         was_in_call = 0
>         user_data = 0x0
>         callback = 0x0
>         cb_funcs = 0x0
>         cb_data = 0x0
>         need_destroy = <optimized out>
>         current_source_link = {data = 0xe5c330, next = 0x0}
>         source = 0xe5c330
>         current = 0xe5c610
>         i = 0
> #16 g_main_context_dispatch (context=context@entry=0xe34f00)
>     at /tmp/buildd/glib2.0-2.36.4/./glib/gmain.c:3630
> No locals.
> #17 0x00007ff671ffd1f8 in g_main_context_iterate (
>     context=context@entry=0xe34f00, block=block@entry=1, 
>     dispatch=dispatch@entry=1, self=<optimized out>)
>     at /tmp/buildd/glib2.0-2.36.4/./glib/gmain.c:3701
>         max_priority = 0
>         timeout = 0
>         some_ready = 1
>         nfds = <optimized out>
>         allocated_nfds = 4
>         fds = 0xe31720
> #18 0x00007ff671ffd29c in g_main_context_iteration (context=0xe34f00, 
>     may_block=1) at /tmp/buildd/glib2.0-2.36.4/./glib/gmain.c:3762
>         retval = <optimized out>
> #19 0x00007ff673a344f5 in gtk_main_iteration ()
>    from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
> No symbol table info available.
> #20 0x00000000004b2492 in ?? ()
> No symbol table info available.
> #21 0x00000000004e4491 in ?? ()
> No symbol table info available.
> #22 0x00000000004e3e75 in ?? ()
> No symbol table info available.
> [...]
> #99 0x00000000004171c5 in ?? ()
> No symbol table info available.
> #100 0x00007ff66e38e995 in __libc_start_main (main=0x4167b0, argc=2, 
>     ubp_av=0x7fff3c1ce088, init=<optimized out>, fini=<optimized out>, 
>     rtld_fini=<optimized out>, stack_end=0x7fff3c1ce078) at libc-start.c:260
>         result = <optimized out>
>         unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 2508716875972236015, 
>                 4291765, 140734201913472, 0, 0, -2508865025507437841, 
>                 -2505095659607010577}, mask_was_saved = 0}}, priv = {pad = {
>               0x0, 0x0, 0x5d1600, 0x7fff3c1ce088}, data = {prev = 0x0, 
>               cleanup = 0x0, canceltype = 6100480}}}
>         not_first_call = <optimized out>
> #101 0x0000000000417cde in ?? ()
> No symbol table info available.
> (gdb) 
>
> Possible related bugs:
>
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=594592
> Same bug but with Emacs 23.
>
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699325
> Still related to getenv, but in a different context.

Thanks
-- 
Rob Browning
rlb @defaultvalue.org and @debian.org
GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A
GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4