[Bug 219402] bsdgrep jemalloc assertion failure with --mmap

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219402

            Bug ID: 219402
           Summary: bsdgrep jemalloc assertion failure with --mmap
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

Running a test like that documented in 165471 resulted in an assertion failure:

nuc% cd /usr/share
nuc% time bsdgrep  --mmap -r -e '^Feb' *
<jemalloc>: jemalloc_arena.c:353: Failed assertion: "p[i] == 0"
zsh: abort      bsdgrep --mmap -r -e '^Feb' *
bsdgrep --mmap -r -e '^Feb' *  0.04s user 0.04s system 99% cpu 0.081 total

(lldb) bt
* thread #1, stop reason = signal SIGABRT
  * frame #0: 0x000000015747cd8a libc.so.7`__sys_thr_kill + 10
    frame #1: 0x000000015747cd54 libc.so.7`raise + 52
    frame #2: 0x000000015747ccc9 libc.so.7`abort + 73
    frame #3: 0x000000015747497f libc.so.7`___lldb_unnamed_symbol886$$libc.so.7
+ 447
    frame #4: 0x000000015746d6f9 libc.so.7`___lldb_unnamed_symbol835$$libc.so.7
+ 233
    frame #5: 0x000000015746d3b1 libc.so.7`___lldb_unnamed_symbol833$$libc.so.7
+ 353
    frame #6: 0x000000015744f96d libc.so.7`___lldb_unnamed_symbol319$$libc.so.7
+ 397
    frame #7: 0x0000000157477eba libc.so.7`___lldb_unnamed_symbol952$$libc.so.7
+ 202
    frame #8: 0x000000015747871b libc.so.7`__realloc + 667
    frame #9: bsdgrep`grep_realloc(ptr=<unavailable>, size=<unavailable>) at
util.c:542
    frame #10: bsdgrep`grep_fgetln [inlined] grep_lnbufgrow at file.c:173
    frame #11: bsdgrep`grep_fgetln(f=0x0000068da0c1c040,
lenp=0x00007fffffffe400) at file.c:213
    frame #12: bsdgrep`procfile(fn="i18n/esdb/esdb.dir.db") at util.c:253
    frame #13: bsdgrep`grep_tree(argv=<unavailable>) at util.c:182
    frame #14: bsdgrep`main(argc=<unavailable>, argv=0x00007fff00000005) at
grep.c:776
    frame #15: 0x000000000040226f bsdgrep`_start + 383

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