GitHub user randall opened an issue:
https://github.com/apache/trafficserver/issues/1363
crash in HostDBContinuation::dnsEvent with ATS 7.0.0
After disabling hostdb sync due to #1322, we're are now seeing this crash:
```
(gdb) thread 49
[Switching to thread 49 (Thread 0x2aaab3f06700 (LWP 18461))]
#0 0x00002aaaad6af37d in __libc_waitpid (pid=<optimized out>,
stat_loc=<optimized out>, options=<optimized out>)
at ../sysdeps/unix/sysv/linux/waitpid.c:41
41 ../sysdeps/unix/sysv/linux/waitpid.c: No such file or directory.
(gdb) bt
#0 0x00002aaaad6af37d in __libc_waitpid (pid=<optimized out>,
stat_loc=<optimized out>, options=<optimized out>)
at ../sysdeps/unix/sysv/linux/waitpid.c:41
#1 0x00002aaaaab7e2f7 in crash_logger_invoke (signo=11,
info=0x2aaab3f05670, ctx=0x2aaab3f05540) at Crash.cc:164
#2 <signal handler called>
#3 HostDBContinuation::dnsEvent (this=0x2aaab7e47cd0, event=<optimized
out>, e=0x2aaaebad8000) at HostDB.cc:1652
#4 0x00002aaaaad9906f in Continuation::handleEvent (data=<optimized out>,
event=600, this=<optimized out>)
at ../../iocore/eventsystem/I_Continuation.h:153
#5 DNSEntry::postEvent (this=0x2aaacc3e3100) at DNS.cc:1274
#6 0x00002aaaaae7e4e0 in Continuation::handleEvent (data=0x2aaac1d3b440,
event=1, this=<optimized out>)
at I_Continuation.h:153
#7 EThread::process_event (this=0x2aaab2608000, e=0x2aaac1d3b440,
calling_code=1) at UnixEThread.cc:128
#8 0x00002aaaaae7f36b in EThread::execute (this=0x2aaab2608000) at
UnixEThread.cc:179
#9 0x00002aaaaae7dec6 in spawn_thread_internal (a=0x2aaab09c0d60) at
Thread.cc:86
#10 0x00002aaaad6a7aa1 in start_thread (arg=0x2aaab3f06700) at
pthread_create.c:301
#11 0x00002aaaae8b093d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:115
(gdb) frame 3
#3 HostDBContinuation::dnsEvent (this=0x2aaab7e47cd0, event=<optimized
out>, e=0x2aaaebad8000) at HostDB.cc:1652
1652 HostDB.cc: No such file or directory.
(gdb) print r
$1 = (HostDBInfo *) 0x0
```
This crash was seen with ATS 7.0.0
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