#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
#1  0x00007f1192a3c953 in __pthread_kill_internal (signo=6, threadid=<optimized out>) at pthread_kill.c:78
#2  0x00007f11929edea8 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3  0x00007f11929d753d in __GI_abort () at abort.c:79
#4  0x00007f11929d829e in __libc_message (fmt=fmt@entry=0x7f1192b4f77e "%s\n") at ../sysdeps/posix/libc_fatal.c:150
#5  0x00007f1192a46657 in malloc_printerr (str=str@entry=0x7f1192b4d22c "free(): invalid pointer") at malloc.c:5651
#6  0x00007f1192a484bc in _int_free (av=<optimized out>, p=<optimized out>, have_lock=have_lock@entry=0) at malloc.c:4425
#7  0x00007f1192a4ae63 in __GI___libc_free (mem=<optimized out>) at malloc.c:3367
#8  0x000055a5b980a17a in read_xattrs_from_system (xattrs=<optimized out>, filename=<optimized out>, dir_ent=<optimized out>) at /usr/src/debug/squashfs-tools/squashfs-tools-4.6/squashfs-tools/xattr.c:227
#9  read_xattrs (type=1, d=0x55a5ba3b9de0) at /usr/src/debug/squashfs-tools/squashfs-tools-4.6/squashfs-tools/xattr.c:713
#10 create_inode (dir_info=dir_info@entry=0x55a5ba3b9f40, dir_ent=0x55a5ba3b9de0, type=type@entry=1, byte_size=byte_size@entry=3, start_block=start_block@entry=0, offset=offset@entry=0, block_list=0x0, fragment=0x0, dir_in=0x7ffcaa539990, sparse=0) at /usr/src/debug/squashfs-tools/squashfs-tools-4.6/squashfs-tools/mksquashfs.c:956
#11 0x000055a5b980eece in write_dir (dir=0x7ffcaa539990, dir_info=0x55a5ba3b9f40) at /usr/src/debug/squashfs-tools/squashfs-tools-4.6/squashfs-tools/mksquashfs.c:1372
#12 dir_scan7 (inode=inode@entry=0x7ffcaa539b08, dir_info=0x55a5ba3b9f40) at /usr/src/debug/squashfs-tools/squashfs-tools-4.6/squashfs-tools/mksquashfs.c:4503
#13 0x000055a5b980ecd3 in dir_scan7 (inode=0x7ffcaa539b08, dir_info=0x55a5ba3b1cf0) at /usr/src/debug/squashfs-tools/squashfs-tools-4.6/squashfs-tools/mksquashfs.c:4395
#14 0x000055a5b9828c06 in do_directory_scans.constprop.0 (dir_ent=<optimized out>, progress=<optimized out>) at /usr/src/debug/squashfs-tools/squashfs-tools-4.6/squashfs-tools/mksquashfs.c:3534
#15 0x000055a5b9804849 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/squashfs-tools/squashfs-tools-4.6/squashfs-tools/mksquashfs.c:3585