Hello, XRootD Developers.
I found that our xrootdfs mount point was disappeared frequently.
I acquired a core file which was related to the program aborting.
Here is a gdb message for this.
Could you check this?
```
(gdb) where
#0 0x0000003741c324f5 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x0000003741c33cd5 in abort () at abort.c:92
#2 0x0000003741c70417 in __libc_message (do_abort=2, fmt=0x3741d58c00 "*** glibc detected *** %s: %s: 0x%s ***\n")
at ../sysdeps/unix/sysv/linux/libc_fatal.c:198
#3 0x0000003741c75e5e in malloc_printerr (action=3, str=0x3741d56bbe "corrupted double-linked list", ptr=<value optimized out>,
ar_ptr=<value optimized out>) at malloc.c:6360
#4 0x0000003741c79066 in _int_free (av=0x7f5578000020, p=0x7f5578026d90, have_lock=0) at malloc.c:5030
#5 0x0000003407a093f1 in XrdFfsWcache_destroy (fd=<value optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdFfs/XrdFfsWcache.cc:139
#6 0x0000003407a094ca in XrdFfsWcache_create (fd=0) at /usr/src/debug/xrootd/xrootd/src/XrdFfs/XrdFfsWcache.cc:114
#7 0x0000000000403ed1 in xrootdfs_create (
path=0x7f53d00008c0 "/store/unmerged/SAM/testSRM/SAM-cms-se.sdfarm.kr/lcg-util/testfile-put-nospacetoken-1576995075-0026e73184df.txt",
mode=<value optimized out>, fi=0x7f53debfcde0) at /usr/src/debug/xrootd/xrootd/src/XrdFfs/XrdFfsXrootdfs.cc:444
#8 0x0000003743c08c2f in fuse_fs_create (fs=0x1ff1a10,
path=0x7f53d00008c0 "/store/unmerged/SAM/testSRM/SAM-cms-se.sdfarm.kr/lcg-util/testfile-put-nospacetoken-1576995075-0026e73184df.txt", mode=33188,
fi=0x7f53debfcde0) at fuse.c:1428
#9 0x0000003743c1090a in fuse_lib_create (req=0x7f53d00013e0, parent=289472, name=0x7f53d40009c8 "testfile-put-nospacetoken-1576995075-0026e73184df.txt",
mode=33188, fi=0x7f53debfcde0) at fuse.c:2407
#10 0x0000003743c146f3 in do_create (req=<value optimized out>, nodeid=<value optimized out>, inarg=<value optimized out>) at fuse_lowlevel.c:705
#11 0x0000003743c120ef in fuse_do_work (data=0x7f53d40008c0) at fuse_loop_mt.c:107
#12 0x0000003742007aa1 in start_thread (arg=0x7f53debfd700) at pthread_create.c:301
#13 0x0000003741ce8c4d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115
(gdb) fram 5
#5 0x0000003407a093f1 in XrdFfsWcache_destroy (fd=<value optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdFfs/XrdFfsWcache.cc:139
139 free(XrdFfsWcacheFbufs[fd].buf);
```
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