GTK applications crash on start

GTK applications crash on start

[Alex ter Weele]

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Hello,

On a recently guix-pulled system I observe an immediate crash when
starting emacs:

    $ emacs -Q

    (process:20087): Gtk-WARNING **: Locale not supported by C library.
            Using the fallback 'C' locale.
    Fatal error 4: Illegal instruction
    Backtrace:
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x504ac2]
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x4ec4f9]
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x503a5e]
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x503c63]
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x503d09]
    /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libpthread.so.0(+0x12000)[0x7f8ac12f7000]
    /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/ld-linux-x86-64.so.2(+0x1ca1c)[0x7f8ac8606a1c]
    Illegal instruction

With the help of OriansJ, I found that
1va3rsg2rjy75gmvfa5xkv2dw970ygaw-emacs-25.3.drv is the .drv that
produces bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3; see attached.

I have a working build of emacs in a previous profile generation --
83rlg4n4slccqrgicpxgr38hgvxga5sh-emacs-25.3. It is produced by
s4wyzhizmn858hvn3zmahmqi7ckphdgi-emacs-25.3.drv, also attached.

I used gdb on the failing emacs:

    (gdb) bt
    #0  0x00007ffff7df4a1c in ?? () from /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/ld-linux-x86-64.so.2
    #1  0x00007fffefecbfbb in dlopen_doit () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
    #2  0x00007ffff01f7901 in _dl_catch_error () from /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libc.so.6
    #3  0x00007fffefecc599 in _dlerror_run () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
    #4  0x00007fffefecc021 in dlopen@@GLIBC_2.2.5 () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
    #5  0x00007fffec693e73 in g_module_open () from /gnu/store/sm37m59gq3smxxz8gs4jikn50qg0g7xh-glib-2.54.2/lib/libgmodule-2.0.so.0
    #6  0x00007ffff6a18339 in _gtk_module_has_mixed_deps () from /gnu/store/gfz7znplsbgsw2npdbz5vgfl90q222hv-gtk+-3.22.26/lib/libgtk-3.so.0
    #7  0x00007ffff69f0b32 in pre_parse_hook () from /gnu/store/gfz7znplsbgsw2npdbz5vgfl90q222hv-gtk+-3.22.26/lib/libgtk-3.so.0
    #8  0x00007ffff4e6ef87 in g_option_context_parse () from /gnu/store/sm37m59gq3smxxz8gs4jikn50qg0g7xh-glib-2.54.2/lib/libglib-2.0.so.0
    #9  0x00007ffff69f125a in gtk_parse_args () from /gnu/store/gfz7znplsbgsw2npdbz5vgfl90q222hv-gtk+-3.22.26/lib/libgtk-3.so.0
    #10 0x00007ffff69f12fa in gtk_init_check () from /gnu/store/gfz7znplsbgsw2npdbz5vgfl90q222hv-gtk+-3.22.26/lib/libgtk-3.so.0
    #11 0x00007ffff69f1359 in gtk_init () from /gnu/store/gfz7znplsbgsw2npdbz5vgfl90q222hv-gtk+-3.22.26/lib/libgtk-3.so.0
    #12 0x00000000004cba84 in x_term_init ()
    #13 0x00000000004cdc57 in Fx_open_connection ()
    #14 0x000000000055d402 in Ffuncall ()
    #15 0x00000000005907d3 in exec_byte_code ()
    #16 0x000000000055d23b in Ffuncall ()
    #17 0x000000000055e6dc in Fapply ()
    #18 0x000000000055d329 in Ffuncall ()
    #19 0x00000000005907d3 in exec_byte_code ()
    #20 0x000000000055d23b in Ffuncall ()
    #21 0x00000000005907d3 in exec_byte_code ()
    #22 0x000000000055d23b in Ffuncall ()
    #23 0x00000000005907d3 in exec_byte_code ()
    #24 0x000000000055c358 in apply_lambda ()
    #25 0x000000000055c67f in eval_sub ()
    #26 0x000000000055fbe1 in Feval ()
    #27 0x000000000055bc32 in internal_condition_case ()
    #28 0x00000000004eef6c in top_level_1 ()
    #29 0x000000000055bbd3 in internal_catch ()
    #30 0x00000000004ec8f8 in command_loop ()
    #31 0x00000000004f0e47 in recursive_edit_1 ()
    #32 0x00000000004f1188 in Frecursive_edit ()
    #33 0x000000000041abd1 in main ()

This indicates a problem in something GTK related. This is corroborated
by terminal Emacs working:

    $ emacs -nw -Q --eval "(kill-emacs)"
    $ echo $?
    0

And by other GTK apps crashing. Here's dino:

    (gdb) run
    Starting program: /gnu/store/d5104zb5s96mjcyycl2v68cnj6wmfl2j-dino-0.0-3.f25fadde2/bin/.dino-real 
    [Thread debugging using libthread_db enabled]
    Using host libthread_db library "/gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libthread_db.so.1".

    (process:10641): Gtk-WARNING **: Locale not supported by C library.
            Using the fallback 'C' locale.

    Program received signal SIGILL, Illegal instruction.
    0x00007ffff7df4a1c in ?? () from /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/ld-linux-x86-64.so.2
    (gdb) bt 
    #0  0x00007ffff7df4a1c in ?? () from /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/ld-linux-x86-64.so.2
    #1  0x00007ffff3c03fbb in dlopen_doit () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
    #2  0x00007ffff426a901 in _dl_catch_error () from /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libc.so.6
    #3  0x00007ffff3c04599 in _dlerror_run () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
    #4  0x00007ffff3c04021 in dlopen@@GLIBC_2.2.5 () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
    #5  0x00007ffff775ee73 in g_module_open () from /gnu/store/sm37m59gq3smxxz8gs4jikn50qg0g7xh-glib-2.54.2/lib/libgmodule-2.0.so.0
    #6  0x00007ffff6309339 in _gtk_module_has_mixed_deps () from /gnu/store/wsdqwpm22l8dgqqibzbgx5zn4bnkz0ci-gtk+-3.22.26/lib/libgtk-3.so.0
    #7  0x00007ffff62e1b32 in pre_parse_hook () from /gnu/store/wsdqwpm22l8dgqqibzbgx5zn4bnkz0ci-gtk+-3.22.26/lib/libgtk-3.so.0
    #8  0x00007ffff475ff87 in g_option_context_parse () from /gnu/store/sm37m59gq3smxxz8gs4jikn50qg0g7xh-glib-2.54.2/lib/libglib-2.0.so.0
    #9  0x00007ffff62e225a in gtk_parse_args () from /gnu/store/wsdqwpm22l8dgqqibzbgx5zn4bnkz0ci-gtk+-3.22.26/lib/libgtk-3.so.0
    #10 0x00007ffff62e22fa in gtk_init_check () from /gnu/store/wsdqwpm22l8dgqqibzbgx5zn4bnkz0ci-gtk+-3.22.26/lib/libgtk-3.so.0
    #11 0x00007ffff62e2359 in gtk_init () from /gnu/store/wsdqwpm22l8dgqqibzbgx5zn4bnkz0ci-gtk+-3.22.26/lib/libgtk-3.so.0
    #12 0x000000000041caa2 in dino_main ()
    #13 0x000000000041c900 in main ()

Where can I go from here to debug this?


[-- Attachment #2: 1va3rsg2rjy75gmvfa5xkv2dw970ygaw-emacs-25.3.drv --]
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Re: GTK applications crash on start

[Ludovic Courtès]

Hi Alex,

Alex ter Weele <alex.ter.weele@gmail.com> skribis:

> I used gdb on the failing emacs:
>
>     (gdb) bt
>     #0  0x00007ffff7df4a1c in ?? () from /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/ld-linux-x86-64.so.2
>     #1  0x00007fffefecbfbb in dlopen_doit () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
>     #2  0x00007ffff01f7901 in _dl_catch_error () from /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libc.so.6
>     #3  0x00007fffefecc599 in _dlerror_run () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
>     #4  0x00007fffefecc021 in dlopen@@GLIBC_2.2.5 () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
>     #5  0x00007fffec693e73 in g_module_open () from /gnu/store/sm37m59gq3smxxz8gs4jikn50qg0g7xh-glib-2.54.2/lib/libgmodule-2.0.so.0
>     #6  0x00007ffff6a18339 in _gtk_module_has_mixed_deps () from /gnu/store/gfz7znplsbgsw2npdbz5vgfl90q222hv-gtk+-3.22.26/lib/libgtk-3.so.0

Could you run the faulty Emacs with:

  LD_DEBUG=files emacs

to see what file it tries and fails to dlopen?

Or otherwise with:

  strace emacs

TIA!

Ludo’.

Re: GTK applications crash on start

[Alex ter Weele]

The bottom of the output of LD_DEBUG=files emacs follows:

     13244:     initialize program: /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3
     13244:
     13244:
     13244:     transferring control: /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3
     13244:
     13244:     opening file=/gnu/store/xfjba1kww8ngdc6nxldd8ly93nh13ayy-gcc-5.5.0-lib/lib/libgcc_s.so.1 [0]; direct_opencount=1
     13244:
     13244:
     13244:     file=libnss_compat.so.2 [0];  dynamically loaded by /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libc.so.6 [0]
     13244:
     13244:     file=libnss_files.so.2 [0];  dynamically loaded by /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libc.so.6 [0]
     13244:     file=libnss_files.so.2 [0];  generating link map
     13244:       dynamic: 0x00007fabc0f6ade0  base: 0x00007fabc0d60000   size: 0x0000000000211738
     13244:         entry: 0x00007fabc0d622d0  phdr: 0x00007fabc0d60040  phnum:                  7
     13244:
     13244:
     13244:     calling init: /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libnss_files.so.2
     13244:
     13244:     opening file=/gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libnss_files.so.2 [0]; direct_opencount=1
     13244:

(process:13244): Gtk-WARNING **: Locale not supported by C library.
        Using the fallback 'C' locale.
Fatal error 4: Illegal instruction
Backtrace:
/gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x504ac2]
/gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x4ec4f9]
/gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x503a5e]
/gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x503c63]
/gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x503d09]
/gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libpthread.so.0(+0x12000)[0x7fabc8629000]
/gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/ld-linux-x86-64.so.2(+0x1ca1c)[0x7fabcf938a1c]
Illegal instruction

Re: GTK applications crash on start

[Ludovic Courtès]

Alex ter Weele <alex.ter.weele@gmail.com> skribis:

> The bottom of the output of LD_DEBUG=files emacs follows:
>
>      13244:     initialize program: /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3
>      13244:
>      13244:
>      13244:     transferring control: /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3
>      13244:
>      13244:     opening file=/gnu/store/xfjba1kww8ngdc6nxldd8ly93nh13ayy-gcc-5.5.0-lib/lib/libgcc_s.so.1 [0]; direct_opencount=1
>      13244:
>      13244:
>      13244:     file=libnss_compat.so.2 [0];  dynamically loaded by /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libc.so.6 [0]
>      13244:
>      13244:     file=libnss_files.so.2 [0];  dynamically loaded by /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libc.so.6 [0]
>      13244:     file=libnss_files.so.2 [0];  generating link map
>      13244:       dynamic: 0x00007fabc0f6ade0  base: 0x00007fabc0d60000   size: 0x0000000000211738
>      13244:         entry: 0x00007fabc0d622d0  phdr: 0x00007fabc0d60040  phnum:                  7
>      13244:
>      13244:
>      13244:     calling init: /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libnss_files.so.2
>      13244:
>      13244:     opening file=/gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libnss_files.so.2 [0]; direct_opencount=1
>      13244:

Looks like nscd is not running.  Can you see if it makes a difference
when you start it?

See
<https://www.gnu.org/software/guix/manual/html_node/Application-Setup.html#Name-Service-Switch-1>.

Ludo’.

Re: GTK applications crash on start

[Alex ter Weele]

It does appear to be running:

    $ sudo herd status nscd
    Status of nscd:
    It is started.
    Running value is 356.
    It is enabled.
    Provides (nscd).
    Requires (user-processes).
    Conflicts with ().
    Will be respawned.
    $ emacs -Q

    (process:15407): Gtk-WARNING **: Locale not supported by C library.
            Using the fallback 'C' locale.
    Fatal error 4: Illegal instruction
    Backtrace:
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x504ac2]
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x4ec4f9]
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x503a5e]
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x503c63]
    /gnu/store/bk22dmj4x23h71pvpj1ndj5xdsm3mgdj-emacs-25.3/bin/emacs-25.3[0x503d09]
    /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libpthread.so.0(+0x12000)[0x7f5fe1a27000]
    /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/ld-linux-x86-64.so.2(+0x1ca1c)[0x7f5fe8d36a1c]
    Illegal instruction

Re: GTK applications crash on start

[Ludovic Courtès]

Alex ter Weele <alex.ter.weele@gmail.com> skribis:

> I used gdb on the failing emacs:
>
>     (gdb) bt
>     #0  0x00007ffff7df4a1c in ?? () from /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/ld-linux-x86-64.so.2
>     #1  0x00007fffefecbfbb in dlopen_doit () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
>     #2  0x00007ffff01f7901 in _dl_catch_error () from /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libc.so.6
>     #3  0x00007fffefecc599 in _dlerror_run () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2
>     #4  0x00007fffefecc021 in dlopen@@GLIBC_2.2.5 () from /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2

Wait, we missed an important bit: there are two different libcs here.

What does this say:

  ldd $(dirname $(readlink -f $(type -P emacs)))/.emacs-25.3-real | grep glibc

Is LD_LIBRARY_PATH or LD_PRELOAD set?

Does the beginning of “LD_DEBUG=files emacs” give hints as to why the
second libc gets picked up?

Thanks,
Ludo’.

Re: GTK applications crash on start

[Alex ter Weele]

ludo@gnu.org (Ludovic Courtès) writes:

> What does this say:
>
>   ldd $(dirname $(readlink -f $(type -P emacs)))/.emacs-25.3-real | grep glibc
>

    $ ldd $(dirname $(readlink -f $(type -P emacs)))/.emacs-25.3-real | grep glibc
            libm.so.6 => /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libm.so.6 (0x00007fd969692000)
            librt.so.1 => /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/librt.so.1 (0x00007fd968869000)
            libpthread.so.0 => /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libpthread.so.0 (0x00007fd966b80000)
            libc.so.6 => /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libc.so.6 (0x00007fd96617c000)
            libdl.so.2 => /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib/libdl.so.2 (0x00007fd965f78000)
            libresolv.so.2 => /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/libresolv.so.2 (0x00007fd962529000)
            /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib/ld-linux-x86-64.so.2 (0x00007fd96de85000)

> Is LD_LIBRARY_PATH or LD_PRELOAD set?
>

    $ echo $LD_LIBRARY_PATH

    $ echo $LD_PRELOAD
    /gnu/store/hfz0z0fs14jgl0kzk5hid2msr83lxii1-spectrwm-3.1.0/lib/libswmhack.so.0.0

That's weird, looks like my WM set LD_PRELOAD. I wouldn't have expected
that. And sure enough, with LD_PRELOAD unset:

    $ LD_PRELOAD= emacs -Q --eval "(kill-emacs)"
    ...(GTK warnings omitted)
    $ echo $?
    0

So why and how does spectrwm set LD_PRELOAD? I can't figure this out.

Other than that, I think I know what's going on: my user's compiled
emacs uses a newer glibc than the one injected by LD_PRELOAD:

    $ objdump -p /gnu/store/hfz0z0fs14jgl0kzk5hid2msr83lxii1-spectrwm-3.1.0/lib/libswmhack.so.0.0
    ...
      RUNPATH              /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25/lib:...

    $ objdump -p $(dirname $(readlink -f $(type -P emacs)))/.emacs-25.3-real 
    ...
      RUNPATH              /gnu/store/n6acaivs0jwiwpidjr551dhdni5kgpcr-glibc-2.26.105-g0890d5379c/lib:...

And that's because I've guix-pulled and upgraded my user more recently
than my system.

> Does the beginning of “LD_DEBUG=files emacs” give hints as to why the
> second libc gets picked up?
>

The first paragraph of output looks like this:

     19839:	
     19839:	file=/gnu/store/hfz0z0fs14jgl0kzk5hid2msr83lxii1-spectrwm-3.1.0/lib/libswmhack.so.0.0 [0];  needed by /gnu/store/icz3hd36aqpjz5slyp4hhr8wsfbgiml1-bash-minimal-4.4.12/bin/bash [0]
     19839:	file=/gnu/store/hfz0z0fs14jgl0kzk5hid2msr83lxii1-spectrwm-3.1.0/lib/libswmhack.so.0.0 [0];  generating link map
     19839:	  dynamic: 0x00007f50b9725dc0  base: 0x00007f50b9524000   size: 0x00000000002020e0
     19839:	    entry: 0x00007f50b9524a90  phdr: 0x00007f50b9524040  phnum:                  6
     19839:	
     19839:	

I think that's just further evidence of the LD_PRELOAD injection.

Re: GTK applications crash on start

[Alex ter Weele]

Alex ter Weele <alex.ter.weele@gmail.com> writes:

>
>     $ echo $LD_LIBRARY_PATH
>
>     $ echo $LD_PRELOAD
>     /gnu/store/hfz0z0fs14jgl0kzk5hid2msr83lxii1-spectrwm-3.1.0/lib/libswmhack.so.0.0
>
> That's weird, looks like my WM set LD_PRELOAD. I wouldn't have expected
> that. And sure enough, with LD_PRELOAD unset:
>
>     $ LD_PRELOAD= emacs -Q --eval "(kill-emacs)"
>     ...(GTK warnings omitted)
>     $ echo $?
>     0
>
> So why and how does spectrwm set LD_PRELOAD? I can't figure this out.

OK, I figured it out:
https://github.com/conformal/spectrwm/blob/SPECTRWM_3_1_0/spectrwm.c#L3764. Looks
like it injects libswmhack.so so that it can intercept X events,
e.g. https://github.com/conformal/spectrwm/blob/SPECTRWM_3_1_0/lib/swm_hack.c#L137

Re: GTK applications crash on start

[Ludovic Courtès]

Alex ter Weele <alex.ter.weele@gmail.com> skribis:

> Alex ter Weele <alex.ter.weele@gmail.com> writes:
>
>>
>>     $ echo $LD_LIBRARY_PATH
>>
>>     $ echo $LD_PRELOAD
>>     /gnu/store/hfz0z0fs14jgl0kzk5hid2msr83lxii1-spectrwm-3.1.0/lib/libswmhack.so.0.0
>>
>> That's weird, looks like my WM set LD_PRELOAD. I wouldn't have expected
>> that. And sure enough, with LD_PRELOAD unset:
>>
>>     $ LD_PRELOAD= emacs -Q --eval "(kill-emacs)"
>>     ...(GTK warnings omitted)
>>     $ echo $?
>>     0

Bingo!

>> So why and how does spectrwm set LD_PRELOAD? I can't figure this out.
>
> OK, I figured it out:
> https://github.com/conformal/spectrwm/blob/SPECTRWM_3_1_0/spectrwm.c#L3764. Looks
> like it injects libswmhack.so so that it can intercept X events,
> e.g. https://github.com/conformal/spectrwm/blob/SPECTRWM_3_1_0/lib/swm_hack.c#L137

Well, the library name says it all.  :-)

Thanks,
Ludo’.