--- Begin Message ---
Closing this bug, I agree with Bernhard there's no evidence of a libx11
bug here; feel free to reopen/reassign with more information if this is
still an issue.
Cheers,
Julien
On Tue, Jun 18, 2024 at 10:22:37 +0200, Bernhard Übelacker wrote:
> On Mon, 27 May 2024 11:22:02 +0100 Jack Beckitt-Marshall <j...@pictura.co.uk>
> wrote:
>
> > When I perform certain actions on my GNOME desktop, such as using the
> > Location
> > bar (Ctrl+L) in Nautilus, clicking on System Information in GNOME Control
> > Center, or click Fonts in GNOME Tweaks, the programs close with a
> > segmentation
> > fault. Here is the output from dmesg.
> >
> > [ 1659.826530] nautilus[19533]: segfault at 41 ip 00007f782c224d5d sp
> > 00007fffa9cbf770 error 4 in libX11.so.6.4.0[7f782c216000+8d000] likely on
> > CPU 7
> > (core 7, socket 0)
> > [ 1659.826554] Code: ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 41
> > 54
> > 49 89 d4 55 48 89 f5 53 48 8b 87 68 09 00 00 48 89 fb 48 85 c0 74 02 <ff>
> > 10 48
> > 89 ee 4c 89 e2 48 89 df e8 63 36 ff ff 89 c5 48 8b 83 68
>
> > Using Wayland and GNOME 44.9.
>
> > Debian Release: trixie/sid
>
>
>
> Hello Jack,
> I am not maintainer of libx11-6, just tried to collect some more information.
>
> From the "Code" line the crash happens in function XGetWindowAttributes.
> It looks strange this function gets called while using a Wayland session.
>
> This gtk issue [1] shows similar calls into XGetWindowAttributes caused by
> some library libim-scim.so from package scim-gtk-immodule.
>
> Please check if you have this installed.
> If it is needed it might be possbile to check if this still happens with
> a Gnome X11 session, if not needed does it happens when this package is
> uninstalled?
>
>
> For exact results a backtrace of the crash would still be good.
> Maybe you can install the package systemd-coredump and retrieve from
> e.g. `journalctl -b0 --no-pager` of a crash with a few lines before and
> afterwards. [2]
>
>
> [1] https://gitlab.gnome.org/GNOME/gtk/-/issues/5472
> [2] https://wiki.debian.org/HowToGetABacktrace
>
>
> Kind regards,
> Bernhard
>
>
>
> [ 1659.826530] nautilus[19533]: segfault at 41 ip 00007f782c224d5d sp
> 00007fffa9cbf770 error 4 in libX11.so.6.4.0[7f782c216000+8d000] likely on CPU
> 7 (core 7, socket 0)
> [ 1659.826554] Code: ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 41 54
> 49 89 d4 55 48 89 f5 53 48 8b 87 68 09 00 00 48 89 fb 48 85 c0 74 02 <ff> 10
> 48 89 ee 4c 89 e2 48 89 df e8 63 36 ff ff 89 c5 48 8b 83 68
> [ 1666.674595] nautilus[19622]: segfault at ff0000 ip 00007fd182c0fd5d sp
> 00007fff51cb2fa0 error 4 in libX11.so.6.4.0[7fd182c01000+8d000] likely on CPU
> 2 (core 2, socket 0)
> [ 1666.674608] Code: ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 41 54
> 49 89 d4 55 48 89 f5 53 48 8b 87 68 09 00 00 48 89 fb 48 85 c0 74 02 <ff> 10
> 48 89 ee 4c 89 e2 48 89 df e8 63 36 ff ff 89 c5 48 8b 83 68
>
>
> https://wiki.debian.org/InterpretingKernelOutputAtProcessCrash
>
>
> error 4
> 0b00000100
> * bit 0 == 0: no page found
> * bit 1 == 0: read access
> * bit 2 == 1: user-mode access
> .
>
>
>
> echo -n "find /b ..., ..., 0x" && \
> echo "ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 41 54 49 89 d4 55 48
> 89 f5 53 48 8b 87 68 09 00 00 48 89 fb 48 85 c0 74 02 <ff> 10 48 89 ee 4c 89
> e2 48 89 df e8 63 36 ff ff 89 c5 48 8b 83 68" \
> | sed 's/[<>]//g' | sed 's/ /, 0x/g'
>
>
>
>
>
> # Trixie/testing amd64 qemu VM 2024-06-18
>
> apt update
> apt dist-upgrade
>
> apt install --no-install-recommends gnome
> apt install gdb
>
>
>
>
> gdb -q --pid $(pgrep nautilus)
>
> pipe info share | grep -i x11
> find /b 0x00007fd8fcd4e970, 0x00007fd8fcdd881e, 0xff, 0x66, 0x66, 0x2e,
> 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00, 0x90, 0xf3, 0x0f, 0x1e, 0xfa,
> 0x41, 0x54, 0x49, 0x89, 0xd4, 0x55, 0x48, 0x89, 0xf5, 0x53, 0x48, 0x8b, 0x87,
> 0x68, 0x09, 0x00, 0x00, 0x48, 0x89, 0xfb, 0x48, 0x85, 0xc0, 0x74, 0x02, 0xff,
> 0x10, 0x48, 0x89, 0xee, 0x4c, 0x89, 0xe2, 0x48, 0x89, 0xdf, 0xe8, 0x63, 0x36,
> 0xff, 0xff, 0x89, 0xc5, 0x48, 0x8b, 0x83, 0x68
>
>
>
>
> benutzer@debian:~$ gdb -q --pid $(pgrep nautilus)
> Attaching to process 2298
> [New LWP 2349]
> [New LWP 2351]
> [New LWP 2352]
> [New LWP 2373]
> [New LWP 2383]
> [New LWP 2384]
> [New LWP 2529]
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> 0x00007fd8fd40947f in __GI___poll (fds=0x5562fdf47790, nfds=2, timeout=24377)
> at ../sysdeps/unix/sysv/linux/poll.c:29
> 29 ../sysdeps/unix/sysv/linux/poll.c: Datei oder Verzeichnis nicht
> gefunden.
> (gdb) pipe info share | grep -i x11
> 0x00007fd8fcd4e970 0x00007fd8fcdd881e Yes (*)
> /lib/x86_64-linux-gnu/libX11.so.6
> 0x00007fd8f8002040 0x00007fd8f800211f Yes (*)
> /lib/x86_64-linux-gnu/libX11-xcb.so.1
> (gdb) find /b 0x00007fd8fcd4e970, 0x00007fd8fcdd881e, 0xff, 0x66, 0x66,
> 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00, 0x90, 0xf3, 0x0f, 0x1e,
> 0xfa, 0x41, 0x54, 0x49, 0x89, 0xd4, 0x55, 0x48, 0x89, 0xf5, 0x53, 0x48, 0x8b,
> 0x87, 0x68, 0x09, 0x00, 0x00, 0x48, 0x89, 0xfb, 0x48, 0x85, 0xc0, 0x74, 0x02,
> 0xff, 0x10, 0x48, 0x89, 0xee, 0x4c, 0x89, 0xe2, 0x48, 0x89, 0xdf, 0xe8, 0x63,
> 0x36, 0xff, 0xff, 0x89, 0xc5, 0x48, 0x8b, 0x83, 0x68
> 0x7fd8fcd5ad33 <_XGetWindowAttributes+483>
> 1 pattern found.
> (gdb) b * (0x7fd8fcd5ad33 + 42)
> Breakpoint 1 at 0x7fd8fcd5ad5d
> (gdb) info b
> Num Type Disp Enb Address What
> 1 breakpoint keep y 0x00007fd8fcd5ad5d <XGetWindowAttributes+29>
> (gdb) disassemble /r 0x7fd8fcd5ad33, 0x7fd8fcd5ad33+62
> Dump of assembler code from 0x7fd8fcd5ad33 to 0x7fd8fcd5ad71:
> 0x00007fd8fcd5ad33 <_XGetWindowAttributes+483>: ff 66 66
> jmp *0x66(%rsi)
> 0x00007fd8fcd5ad36: 2e 0f 1f 84 00 00 00
> 00 00 cs nopl 0x0(%rax,%rax,1)
> 0x00007fd8fcd5ad3f: 90
> nop
> 0x00007fd8fcd5ad40 <XGetWindowAttributes+0>: f3 0f 1e fa
> endbr64
> 0x00007fd8fcd5ad44 <XGetWindowAttributes+4>: 41 54
> push %r12
> 0x00007fd8fcd5ad46 <XGetWindowAttributes+6>: 49 89 d4
> mov %rdx,%r12
> 0x00007fd8fcd5ad49 <XGetWindowAttributes+9>: 55
> push %rbp
> 0x00007fd8fcd5ad4a <XGetWindowAttributes+10>: 48 89 f5
> mov %rsi,%rbp
> 0x00007fd8fcd5ad4d <XGetWindowAttributes+13>: 53
> push %rbx
> 0x00007fd8fcd5ad4e <XGetWindowAttributes+14>: 48 8b 87 68 09 00 00
> mov 0x968(%rdi),%rax
> 0x00007fd8fcd5ad55 <XGetWindowAttributes+21>: 48 89 fb
> mov %rdi,%rbx
> 0x00007fd8fcd5ad58 <XGetWindowAttributes+24>: 48 85 c0
> test %rax,%rax
> 0x00007fd8fcd5ad5b <XGetWindowAttributes+27>: 74 02
> je 0x7fd8fcd5ad5f <XGetWindowAttributes+31>
> 0x00007fd8fcd5ad5d <XGetWindowAttributes+29>: ff 10
> call *(%rax) <<<<<<<<
> 0x00007fd8fcd5ad5f <XGetWindowAttributes+31>: 48 89 ee
> mov %rbp,%rsi
> 0x00007fd8fcd5ad62 <XGetWindowAttributes+34>: 4c 89 e2
> mov %r12,%rdx
> 0x00007fd8fcd5ad65 <XGetWindowAttributes+37>: 48 89 df
> mov %rbx,%rdi
> 0x00007fd8fcd5ad68 <XGetWindowAttributes+40>: e8 63 36 ff ff
> call 0x7fd8fcd4e3d0 <_XGetWindowAttributes@plt>
> 0x00007fd8fcd5ad6d <XGetWindowAttributes+45>: 89 c5
> mov %eax,%ebp
> 0x00007fd8fcd5ad6f <XGetWindowAttributes+47>: 48 8b 83 68 09 00 00
> mov 0x968(%rbx),%rax
> End of assembler dump.
> (gdb)
>
>
>
>
> https://gitlab.gnome.org/GNOME/gtk/-/issues/5472
>
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