it crashed at the function log_raw.
here is the backtrace
== Backtrace
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:49
#1 0x0000007f82ed54b4 in __GI_abort () at abort.c:79
#2 0x0000007f82f1f984 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f82fdc660 "%s\n") at ../sysdeps/posix/libc_fatal.c:155
#3 0x0000007f82f273dc in malloc_printerr (str=str@entry=0x7f82fd7bc8 "corrupted double-linked list") at malloc.c:5389
#4 0x0000007f82f27cc8 in unlink_chunk (p=p@entry=0x7f64012260, av=0x7f64000020) at malloc.c:1472
#5 0x0000007f82f27e48 in malloc_consolidate (av=av@entry=0x7f64000020) at malloc.c:4539
#6 0x0000007f82f29df0 in _int_malloc (av=av@entry=0x7f64000020, bytes=bytes@entry=8192) at malloc.c:3727
#7 0x0000007f82f2c5b0 in __libc_calloc (n=<optimized out>, elem_size=<optimized out>) at malloc.c:3448
#8 0x0000007f82f1e41c in __GI___open_memstream (bufloc=bufloc@entry=0x7f72ffc3f8, sizeloc=sizeloc@entry=0x7f72ffc400) at memstream.c:83
#9 0x0000007f82f7d274 in __vsyslog_internal (pri=31, pri@entry=7, fmt=fmt@entry=0x5584b5f930 "%s: %s", ap=..., mode_flags=mode_flags@entry=2) at ../misc/syslog.c:181
#10 0x0000007f82f7d810 in __syslog_chk (pri=pri@entry=7, flag=flag@entry=1, fmt=fmt@entry=0x5584b5f930 "%s: %s") at ../misc/syslog.c:136
#11 0x0000005584b45884 in syslog (__fmt=0x5584b5f930 "%s: %s", __pri=7) at /usr/include/bits/syslog.h:31
#12 log_raw (level=level@entry=7, stamp=stamp@entry=0x7f64003420 "2023.06.16 01:36:58", id=id@entry=0x7f64001120 "LOG7[19]", text=text@entry=0x7f6401b060 "Service [proxy-r] started", opt=<optimized out>, opt=<optimized out>) at ../../stunnel-5.57/src/log.c:263
#13 0x0000005584b45b88 in s_log (level=level@entry=7, format=format@entry=0x5584b5a780 "Service [%s] started") at ../../stunnel-5.57/src/log.c:192
#14 0x0000005584b454e8 in client_main (c=c@entry=0x7f82e30060) at ../../stunnel-5.57/src/client.c:178
#15 0x0000005584b45658 in client_thread (arg=0x7f82e30060) at ../../stunnel-5.57/src/client.c:130
#16 0x0000007f83026e64 in start_thread (arg=0x7fc21e457f) at pthread_create.c:463
#17 0x0000007f82f815dc in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:78
== Thread apply all backtrace full
