Thomas Jackson created TS-4276:
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Summary: Segmentation fault when hostdb runs out of space
Key: TS-4276
URL: https://issues.apache.org/jira/browse/TS-4276
Project: Traffic Server
Issue Type: Bug
Reporter: Thomas Jackson
Hostdb assumes that `lookup_done` returns a valid HostDBInfo (as mentioned in
comments--
https://github.com/apache/trafficserver/blob/master/iocore/hostdb/HostDB.cc#L1545).
In actuality lookup_done can actually return NULL in error conditions--
primarily when it is full
(https://github.com/apache/trafficserver/blob/master/iocore/hostdb/HostDB.cc#L1363).
Because of this, if a lookup is being done when hostdb is full, r comes back
as NULL and we get a segmentation fault that looks like:
{noformat}
traffic_server: Segmentation fault (Address not mapped to object [(nil)])
traffic_server - STACK TRACE:
./bin/traffic_server(_Z19crash_logger_invokeiP9siginfo_tPv+0x8e)[0x4ab81e]
/lib64/libpthread.so.0(+0x109f0)[0x7f991609a9f0]
./bin/traffic_server(_ZN18HostDBContinuation8dnsEventEiP7HostEnt+0xebb)[0x6ad5bb]
./bin/traffic_server(_ZN8DNSEntry9postEventEiP5Event+0x45)[0x6c5405]
./bin/traffic_server(_ZN7EThread13process_eventEP5Eventi+0x8a)[0x7c2c0a]
./bin/traffic_server(_ZN7EThread7executeEv+0x7e8)[0x7c3a38]
./bin/traffic_server[0x7c26e5]
/lib64/libpthread.so.0(+0x760a)[0x7f991609160a]
/lib64/libc.so.6(clone+0x6d)[0x7f9914fa4a4d]
Segmentation fault (core dumped)
{noformat}
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