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bug#45515: 28.0.50; [feature/native-comp] emacsGcc crash on Apple Silico


From: mp
Subject: bug#45515: 28.0.50; [feature/native-comp] emacsGcc crash on Apple Silicon M1
Date: Wed, 30 Dec 2020 01:42:58 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:78.0) Gecko/20100101 Thunderbird/78.6.0


On 29.12.2020 16:33, Andrea Corallo wrote:
mp <michal@panoch.net> writes:

On 29.12.2020 10:01, Andrea Corallo wrote:

michal panoch <michal@panoch.net> writes:

hi,

i'm on the new Apple Silicon M1 architecture and using nix emacs-overlay - 
https://github.com/nix-community/emacs-overlay/

like this: ~/.config/nixpkgs/overlays/emacs.nix

import (builtins.fetchTarball {
    url = https://github.com/nix-community/emacs-overlay/archive/master.tar.gz;
})

install whith:

$ nix-env -iA nixpkgs.emacsGcc

it compiles no problem. it runs and bytecompiles everything no problem, but 
after a while it crashes with:

Assertion failed: (mach_vm_map(mach_task_self(), &address, size, 0,
VM_FLAGS_ANYWHERE |
VM_MAKE_TAG(VM_MEMORY_COREGRAPHICS_BACKINGSTORES), port, 0, false,
prot, prot, VM_INHERIT_SHARE) == KERN_SUCCESS), function
backing_map, file
/AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/SkyLight/SkyLight-569.6/SkyLight/Services/Windows/CGSBackingStore.c,
line 192. Fatal error 6: Aborted [1] 2319 abort emacs --fg-daemon

any idea how to investigate?

uname -a:
Darwin mpm.local 20.2.0 Darwin Kernel Version 20.2.0: Wed Dec  2 20:40:21 PST 
2020; root:xnu-7195.60.75~1/RELEASE_ARM64_T8101 arm64
Hi Michal,

this assertion is out of our code so doesn't ring any bell to me.
Running under a debugger to have a back-trace of the crash might give
more information.

Thanks

    Andrea
trying to run with gbd, but it doesn't seem to be working:

mp@mpm:~ :$ gdb /Users/mp/.nix-profile/bin/emacs
GNU gdb (GDB) 10.1
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
     <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /Users/mp/.nix-profile/bin/emacs...
(No debugging symbols found in /Users/mp/.nix-profile/bin/emacs)
This build is stripped (no debug symbols).  I'd build manually from
source to have 100% control leaving a side a layer (not a Nix expert of
user).

(gdb) r --fg-daemon
Starting program:
/nix/store/2y79kkpvkbjdd2jzdxx2w3p3mxdqpagf-user-environment/bin/emacs
--fg-daemon
[New Thread 0x2a03 of process 54326]
[New Thread 0x2b03 of process 54326]
../../gdb/target.c:2149: internal-error: void
target_mourn_inferior(ptid_t): Assertion `ptid == inferior_ptid'
failed.
A problem internal to GDB has been detected,
Looks like an internal problem of gdb?  Perhaps gdb doesn't like to run
under rosetta?  Is this an X86 gdb build correct?  You might be more
lucky with lldb.

That said I think to have native-comp running native on M1 GCC will have
to be ported and AFAIK this has still not be done (at list in GCC
trunk).

Hope it helps

   Andrea

looks like it has been fixed.. after installing new nix package emacs-gcc-20201229.0 it hasn't crashed yet..

-mp-







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