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bug#42832: 28.0.50; "Bus error" when compiling Emacs now on Debian bulls

From: Pip Cet
Subject: bug#42832: 28.0.50; "Bus error" when compiling Emacs now on Debian bullseye
Date: Fri, 14 Aug 2020 12:05:08 +0000

On Fri, Aug 14, 2020 at 11:49 AM Lars Ingebrigtsen <larsi@gnus.org> wrote:
> Pip Cet <pipcet@gmail.com> writes:
> > Can you find out which hash table lives at 0x7ffff19a41a8? I'd suggest
> > something like "find &globals,&globals+1,0x7ffff19a41ad" to get the
> > offset in globals, if it is a global variable, then looking it up with
> > "ptype/o globals".
> That's the value from mark_vectorlike?  It's moved a bit:

That's strange, but possible if non-reproducible things happen on the dbus...

> #9  0x00005555556d6d7e in mark_vectorlike (header=header@entry=0x7ffff19a4190)
>     at alloc.c:6280
> But it says:
> (gdb) find &globals,&globals+1,0x7ffff19a4190
> Pattern not found.

It would probably be 0x7ffff19a4195 that we'd be looking for, stored
as a tagged pointer, but it's possible it's not a global variable at
all, of course.

> > (If you don't have the time, I'd be happy to look at the core file
> > myself, if we can arrange that).
> The machine is unfortunately deep inside my private network, so there's
> no easy way to allow ssh to it...

If you do have a machine that could serve files, it'd be the core file
and the corresponding emacs executable that would be most interesting.
I expect the core file to be rather large, though.

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