GitHub user randall opened an issue:
https://github.com/apache/trafficserver/issues/1427
Crash in ATSConsistentHash::lookup_by_hashval
This crash has been seen several times in our environment. The crash
happens under ATS 7.0.0 using the same configs we used for 6.1.x.
```
Thread 53 (Thread 0x2aaab550c700 (LWP 34185)):
#0 0x00002aaaad74437d in __libc_waitpid (pid=<optimized out>,
stat_loc=<optimized out>, options=<optimized out>)
at ../sysdeps/unix/sysv/linux/waitpid.c:41
#1 0x00002aaaaab83297 in crash_logger_invoke (signo=11,
info=0x2aaab550b070, ctx=0x2aaab550af40) at Crash.cc:164
#2 <signal handler called>
#3 std::_Rb_tree<unsigned long, std::pair<unsigned long const,
ATSConsistentHashNode*>, std::_Select1st<std::pair<unsigned long const,
ATSConsistentHashNode*> >, std::less<unsigned long>,
std::allocator<std::pair<unsigned long const, ATSConsistentHashNode*> >
>::_M_lower_bound (this=<optimized out>, __k=<synthetic pointer>,
__y=<optimized out>,
__x=0xf010848d48138b48) at
/opt/gcc/include/c++/4.9.3/bits/stl_tree.h:1261
#4 std::_Rb_tree<unsigned long, std::pair<unsigned long const,
ATSConsistentHashNode*>, std::_Select1st<std::pair<unsigned long const,
ATSConsistentHashNode*> >, std::less<unsigned long>,
std::allocator<std::pair<unsigned long const, ATSConsistentHashNode*> >
>::lower_bound (__k=<synthetic pointer>, this=0x2aaab09a55d0)
at /opt/gcc/include/c++/4.9.3/bits/stl_tree.h:927
#5 std::map<unsigned long, ATSConsistentHashNode*, std::less<unsigned
long>, std::allocator<std::pair<unsigned long const, ATSConsistentHashNode*> >
>::lower_bound (__x=<synthetic pointer>, this=0x2aaab09a55d0)
at /opt/gcc/include/c++/4.9.3/bits/stl_map.h:902
#6 ATSConsistentHash::lookup_by_hashval (this=0x2aaab09a55c0,
hashval=hashval@entry=5900063373752482705,
i=i@entry=0x2ae427476320, w=w@entry=0x2aaab550b540) at
ConsistentHash.cc:200
#7 0x00002aaaaabcb059 in ParentConsistentHash::selectParent
(this=0x2aaab6d7c180, policy=0x2aaab782b710,
first_call=true, result=0x2ae4274762e8, rdata=0x2ae427476268) at
ParentConsistentHash.cc:123
#8 0x00002aaaaabcc147 in ParentConfigParams::selectParent
(rdata=0x2ae427476268, result=0x2ae4274762e8,
firstCall=true, this=0x2aaab782b6f0) at ParentSelection.h:337
#9 ParentConfigParams::findParent (this=0x2aaab782b6f0,
rdata=rdata@entry=0x2ae427476268,
result=result@entry=0x2ae4274762e8) at ParentSelection.cc:147
#10 0x00002aaaaacd463b in find_server_and_update_current_info
(s=0x2ae427475970) at HttpTransact.cc:276
#11 0x00002aaaaace3d36 in HttpTransact::HandleCacheOpenReadMiss
(s=0x2ae427475970) at HttpTransact.cc:3094
#12 0x00002aaaaacad49e in HttpSM::call_transact_and_set_next_state
(this=this@entry=0x2ae427475900, f=f@entry=0x0)
at HttpSM.cc:7103
#13 0x00002aaaaacb7baf in HttpSM::handle_api_return (this=0x2ae427475900)
at HttpSM.cc:1604
#14 0x00002aaaaacba5eb in HttpSM::state_api_callout (this=0x2ae427475900,
event=0, data=0x0) at HttpSM.cc:1542
#15 0x00002aaaaacbf62b in HttpSM::set_next_state (this=0x2ae427475900) at
HttpSM.cc:7144
#16 0x00002aaaaacad47a in HttpSM::call_transact_and_set_next_state
(this=this@entry=0x2ae427475900, f=f@entry=0x0)
at HttpSM.cc:7111
#17 0x00002aaaaacb9910 in HttpSM::state_hostdb_lookup (this=0x2ae427475900,
event=500, data=0x2aad393cac00)
at HttpSM.cc:2217
#18 0x00002aaaaacc165d in HttpSM::main_handler (this=0x2ae427475900,
event=500, data=0x2aad393cac00) at HttpSM.cc:2661
#19 0x00002aaaaadc7f37 in Continuation::handleEvent (data=0x2aad393cac00,
event=500, this=0x2ae427475900)
at ../../iocore/eventsystem/I_Continuation.h:153
#20 reply_to_cont (cont=0x2ae427475900, r=0x2aad393cac00, is_srv=<optimized
out>) at HostDB.cc:474
#21 0x00002aaaaadcc79d in HostDBContinuation::dnsEvent (this=<optimized
out>, event=<optimized out>, e=<optimized out>)
at HostDB.cc:1450
#22 0x00002aaaaade3821 in Continuation::handleEvent (data=<optimized out>,
event=600, this=<optimized out>)
at ../../iocore/eventsystem/I_Continuation.h:153
#23 DNSEntry::postEvent (this=0x2aaab7ac5c00) at DNS.cc:1269
#24 0x00002aaaaaf06800 in Continuation::handleEvent (data=0x2ae777745e80,
event=1, this=<optimized out>)
at I_Continuation.h:153
#25 EThread::process_event (this=0x2aaab240dd40, e=0x2ae777745e80,
calling_code=1) at UnixEThread.cc:143
#26 0x00002aaaaaf0780f in EThread::execute (this=0x2aaab240dd40) at
UnixEThread.cc:197
#27 0x00002aaaaaf06136 in spawn_thread_internal (a=0x2aaab0998340) at
Thread.cc:84
#28 0x00002aaaad73caa1 in start_thread (arg=0x2aaab550c700) at
pthread_create.c:301
#29 0x00002aaaae5f393d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:115
```
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