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https://issues.apache.org/jira/browse/TS-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14727022#comment-14727022
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Brian Geffon commented on TS-2193:
----------------------------------
This allows the DNS thread to jump back to a NET thread. The problem with DNS
threads today is that they don't call back via a net thread which is why this
crash happens. This patch only fixes the situation when DNS threads are
enabled, it allows it to jump back. Makes sense?
> 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: Brian Geffon
> Labels: Crash
> Fix For: 6.1.0
>
> 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]
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