Abort trap (core dumped) building master on FreeBSD

[Joseph Mingrone]

Hello,

For a few months, we have been seeing occasional builds that end with
core dumps.  Here is an example:
http://pkg.awarnach.mathstat.dal.ca/data/12amd64-default/2020-08-01_09h10m54s/logs/errors/emacs-devel-28.0.50.20200801,2.log

I'm only reporting this now, because, until today, I was never able to
reproduce the problem in an interactive build when the core file could
be analyzed.  Unfortunately, when I rebuilt with debugging symbols the
build finished successfully.  Below is the less than helpful back trace
without debugging symbols.  I will keep trying to reproduce the error
with debugging symbols and report back if I have more useful
information.

Regards,

Joe

root@12amd64-default:/wrkdirs/usr/ports/editors/emacs-devel/work-full/emacs-fbe363f/lisp
 # gdb ../src/emacs emacs.core
GNU gdb (GDB) 9.2 [GDB v9.2 for FreeBSD]
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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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-portbld-freebsd12.1".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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For help, type "help".
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Reading symbols from ../src/emacs...
[New LWP 101600]
[New LWP 100419]
Core was generated by `../src/emacs -batch --no-site-file --no-site-lisp --eval 
(setq load-prefer-newer'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00000008067981ba in thr_kill () from /lib/libc.so.7
[Current thread is 1 (LWP 101600)]
(gdb) backtrace
#0  0x00000008067981ba in thr_kill () at /lib/libc.so.7
#1  0x00000008067965e4 in raise () at /lib/libc.so.7
#2  0x0000000000368092 in terminate_due_to_signal ()
#3  0x0000000000385708 in  ()
#4  0x00000000003cdc3b in  ()
#5  0x00000000003cd68a in mark_object ()
#6  0x00000000003cd28a in mark_object ()
#7  0x00000000003cd68a in mark_object ()
#8  0x00000000003ca7db in mark_stack ()
#9  0x0000000000465745 in mark_threads_callback ()
#10 0x00000000003cc6a2 in garbage_collect ()
#11 0x00000000003f3d7f in Ffuncall ()
#12 0x0000000000437046 in exec_byte_code ()
#13 0x00000000003f3f19 in Ffuncall ()
#14 0x0000000000437046 in exec_byte_code ()
#15 0x00000000003f3f19 in Ffuncall ()
#16 0x0000000000437046 in exec_byte_code ()
#17 0x00000000003f3f19 in Ffuncall ()
#18 0x0000000000437046 in exec_byte_code ()
#19 0x00000000003f3f19 in Ffuncall ()
#20 0x0000000000437046 in exec_byte_code ()
#21 0x00000000003f3f19 in Ffuncall ()
#22 0x0000000000437046 in exec_byte_code ()
#23 0x00000000003f3f19 in Ffuncall ()
#24 0x0000000000437046 in exec_byte_code ()
#25 0x00000000003f3f19 in Ffuncall ()
<snip>
#500 0x0000000000437046 in exec_byte_code ()
#501 0x00000000003f3f19 in Ffuncall ()
#502 0x0000000000437046 in exec_byte_code ()
#503 0x00000000003f37ce in apply_lambda ()
#504 0x00000000003f021b in eval_sub ()
#505 0x00000000003f3500 in Feval ()
#506 0x00000000003f280c in internal_condition_case ()
#507 0x000000000037bcc2 in top_level_1 ()
#508 0x00000000003f21b2 in internal_catch ()
#509 0x000000000036b041 in command_loop ()
#510 0x000000000036af9a in recursive_edit_1 ()
#511 0x000000000036b1ff in Frecursive_edit ()
#512 0x0000000000369db2 in main ()
(gdb)

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