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Leif Hedstrom commented on TS-2193: ----------------------------------- I stumbled up on this, more or less by mistake. In my setup, if I enable parent proxy, then the synthetic health checks can trigger this. It'd only trigger once per day in my test, when the entry expires out of HostDB, but it pretty consistently reproduces if I clear HostDB first. All I did was enable the DNS thread, and parent proxying (the details there probably don't matter, as long as you have a least one rule in parent.config), and then I did {code} curl -X localhost:80 http://127.0.0.1/synthetic.txt {code} > Trafficserver 4.1 Crash with proxy.config.dns.dedicated_thread = 1 > ------------------------------------------------------------------ > > Key: TS-2193 > URL: https://issues.apache.org/jira/browse/TS-2193 > Project: Traffic Server > Issue Type: Bug > Components: DNS > Affects Versions: 4.1.2 > Reporter: Tommy Lee > Assignee: Alan M. Carroll > Labels: Crash > Fix For: 5.3.0 > > Attachments: bt-01.txt > > > Hi all, > I've tried to enable DNS Thread without luck. > When i set proxy.config.dns.dedicated_thread to 1, it crashes with the > information below. > The ATS is working in Forward Proxy mode. > Thanks in advance. > -------------------------------------- > traffic.out > NOTE: Traffic Server received Sig 11: Segmentation fault > /usr/local/cache-4.1/bin/traffic_server - STACK TRACE: > /lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0)[0x2af714875cb0] > /usr/local/cache-4.1/bin/traffic_server(_Z16_acquire_sessionP13SessionBucketPK8sockaddrR7INK_MD5P6HttpSM+0x52)[0x51dac2] > /usr/local/cache-4.1/bin/traffic_server(_ZN18HttpSessionManager15acquire_sessionEP12ContinuationPK8sockaddrPKcP17HttpClientSessionP6HttpSM+0x3d1)[0x51e0f1] > /usr/local/cache-4.1/bin/traffic_server(_ZN6HttpSM19do_http_server_openEb+0x30c)[0x53644c] > /usr/local/cache-4.1/bin/traffic_server(_ZN6HttpSM14set_next_stateEv+0x6a0)[0x537560] > /usr/local/cache-4.1/bin/traffic_server(_ZN6HttpSM14set_next_stateEv+0x57e)[0x53743e] > /usr/local/cache-4.1/bin/traffic_server(_ZN6HttpSM14set_next_stateEv+0x57e)[0x53743e] > /usr/local/cache-4.1/bin/traffic_server(_ZN6HttpSM27state_hostdb_reverse_lookupEiPv+0xb9)[0x526b99] > /usr/local/cache-4.1/bin/traffic_server(_ZN6HttpSM12main_handlerEiPv+0xd8)[0x531be8] > /usr/local/cache-4.1/bin/traffic_server[0x5d7c8a] > /usr/local/cache-4.1/bin/traffic_server(_ZN18HostDBContinuation8dnsEventEiP7HostEnt+0x821)[0x5decd1] > /usr/local/cache-4.1/bin/traffic_server(_ZN8DNSEntry9postEventEiP5Event+0x44)[0x5f7a94] > /usr/local/cache-4.1/bin/traffic_server[0x5fd382] > /usr/local/cache-4.1/bin/traffic_server(_ZN10DNSHandler8recv_dnsEiP5Event+0x852)[0x5fee72] > /usr/local/cache-4.1/bin/traffic_server(_ZN10DNSHandler9mainEventEiP5Event+0x14)[0x5ffd94] > /usr/local/cache-4.1/bin/traffic_server(_ZN7EThread13process_eventEP5Eventi+0x91)[0x6b2a41] > /usr/local/cache-4.1/bin/traffic_server(_ZN7EThread7executeEv+0x514)[0x6b3534] > /usr/local/cache-4.1/bin/traffic_server[0x6b17ea] > /lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a)[0x2af71486de9a] > /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x2af71558dccd] -- This message was sent by Atlassian JIRA (v6.3.4#6332)