[Bug sanitizer/80498] Simple program with address sanitizer and regex hangs

["gcc at zutt dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80498

--- Comment #15 from jonne <gcc at zutt dot org> ---
I ran the below command to check memory usage. After an initial quick increase
it doesn't seem to grow much.

$ while true; sleep 1; do ps -p $(pgrep -fl ./a.out | awk '{ print $1 }') -o
pmem,rss,vsize,pid; done
%MEM    RSS      VSZ   PID
23.3 3906860 21477314476  3003
%MEM    RSS      VSZ   PID
32.0 5363024 21477314476  3003
%MEM    RSS      VSZ   PID
31.9 5347572 21477314476  3003
... snip ...
31.6 5293268 21477314476  3003
%MEM    RSS      VSZ   PID
31.5 5287440 21477314476  3003
%MEM    RSS      VSZ   PID
31.6 5293988 21477314476  3003
%MEM    RSS      VSZ   PID
31.5 5290748 21477314476  3003

I'm afraid I'm still unable to provide a useful stacktrace.

(gdb) run
Starting program: /private/tmp/a.out
[New Thread 0x1403 of process 3338]
warning: unhandled dyld version (15)
==3338==AddressSanitizer: libc interceptors initialized
|| `[0x200000000000, 0x7fffffffffff]` || HighMem    ||
|| `[0x140000000000, 0x1fffffffffff]` || HighShadow ||
|| `[0x120000000000, 0x13ffffffffff]` || ShadowGap  ||
|| `[0x100000000000, 0x11ffffffffff]` || LowShadow  ||
|| `[0x000000000000, 0x0fffffffffff]` || LowMem     ||
MemToShadow(shadow): 0x120000000000 0x123fffffffff 0x128000000000
0x13ffffffffff
redzone=16
max_redzone=2048
quarantine_size_mb=256M
malloc_context_size=30
SHADOW_SCALE: 3
SHADOW_GRANULARITY: 8
SHADOW_OFFSET: 0x100000000000
==3338==Installed the sigaction for signal 11
==3338==Installed the sigaction for signal 10
==3338==SetCurrentThread: 0x0001035c9000 for thread 0x7fffd10413c0
==3338==T0: stack [0x7fff5f400000,0x7fff5fc00000) size 0x800000;
local=0x7fff5fbfb88c
==3338==AddressSanitizer Init done
^C
Thread 2 received signal SIGINT, Interrupt.
0x00007fffc8342bc9 in ?? ()
(gdb) bt
#0  0x00007fffc8342bc9 in ?? ()
#1  0x00007fff5fbfd520 in ?? ()
#2  0x0000000100479300 in ?? ()
#3  0x0000000000000000 in ?? ()