Crash report: http_ui cache lookup, double free
-----------------------------------------------
Key: TS-1171
URL: https://issues.apache.org/jira/browse/TS-1171
Project: Traffic Server
Issue Type: Bug
Components: Core
Affects Versions: 3.1.4
Reporter: Zhao Yongming
{code}
*** glibc detected *** /opt/ats/bin/traffic_server: double free or corruption
(!prev): 0x00000000013e9a50 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x77856)[0x2b14ef973856]
/lib64/libc.so.6(cfree+0x6c)[0x2b14ef97774c]
/opt/ats/bin/traffic_server(ShowCache::~ShowCache()+0x20)[0x6428c0]
/opt/ats/bin/traffic_server(ShowCont::done(int, int, void*)+0x23)[0x5e1c63]
/opt/ats/bin/traffic_server(ShowCache::handleCacheEvent(int,
Event*)+0x15d7)[0x641ee7]
/opt/ats/bin/traffic_server(Cache::open_read(Continuation*, INK_MD5*,
CacheFragType, char*, int)+0x42c)[0x64e62c]
/opt/ats/bin/traffic_server(ShowCache::lookup_url(int, Event*)+0x1a5)[0x63f655]
/opt/ats/bin/traffic_server(EThread::process_event(Event*, int)+0x90)[0x6a6350]
/opt/ats/bin/traffic_server(EThread::execute()+0x31b)[0x6a6c3b]
/opt/ats/bin/traffic_server[0x6a5142]
/lib64/libpthread.so.0(+0x8e2c)[0x2b14ed0f5e2c]
/lib64/libc.so.6(clone+0x6d)[0x2b14ef9d63cd]
{code}
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