.
Thread 1 (LWP 18220):
#0  0x00007f687dbc7f77 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 18220
        selftid = 18220
#1  0x00007f687dbcb5e8 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x1bd4470, sa_sigaction = 0x1bd4470}, sa_mask = {__val = {1, 3, 140086766632053, 1, 0, 28705952, 140086762634472, 28705952, 3, 28706040, 140086766659365, 0, 1, 37, 0, 140735411638368}}, sa_flags = 3, sa_restorer = 0x8030}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x000000000040d85b in leave_dir (ent=<optimized out>, fts=<optimized out>) at lib/fts-cycle.c:136
        obj = {dev = 64513, ino = 2753515, fts_ent = 0x0}
        found = <optimized out>
#3  leave_dir (ent=ent@entry=0x1bdbba0, fts=0x1b604a0, fts=0x1b604a0) at lib/fts-cycle.c:125
        st = 0x1bdbc18
#4  0x000000000040e367 in fts_build (sp=sp@entry=0x1b604a0, type=type@entry=3) at lib/fts.c:1337
        p = <optimized out>
        head = <optimized out>
        nitems = <optimized out>
        tail = <optimized out>
        oldaddr = <optimized out>
        saved_errno = <optimized out>
        descend = <optimized out>
        doadjust = <optimized out>
        level = <optimized out>
        nlinks = <optimized out>
        len = <optimized out>
        maxlen = <optimized out>
        new_len = <optimized out>
        cp = <optimized out>
        dir_fd = 3
        cur = 0x1bdbba0
        continue_readdir = false
        max_entries = <optimized out>
#5  0x000000000040f1d3 in fts_read (sp=sp@entry=0x1b604a0) at lib/fts.c:917
        p = 0x1bdbba0
        tmp = <optimized out>
        instr = <optimized out>
        t = <optimized out>
#6  0x0000000000402cf1 in du_files (bit_flags=280, files=<optimized out>) at src/du.c:606
        ent = <optimized out>
        fts = 0x1b604a0
        ok = true
        files = 0x618480 <temp_argv.6842>
#7  main (argc=<optimized out>, argv=<optimized out>) at src/du.c:1048
        skip_file = <optimized out>
        ai_err = <optimized out>
        file_name = <optimized out>
        cwd_only = {0x4152c4 ".", 0x0}
        max_depth_specified = 160
        ok = true
        files_from = <optimized out>
        bit_flags = 280
        symlink_deref_bits = <optimized out>
        opt_summarize_only = <optimized out>
        ai = 0x1b5f050
        temp_argv = {0x4152c4 ".", 0x0}
        __PRETTY_FUNCTION__ = "main"