Assert in HttpTransact::HandleCacheOpenReadMiss
-----------------------------------------------
Key: TS-942
URL: https://issues.apache.org/jira/browse/TS-942
Project: Traffic Server
Issue Type: Bug
Components: HTTP
Affects Versions: 3.1.1
Reporter: Leif Hedstrom
Priority: Critical
Fix For: 3.1.1
I'm seeing a crasher (see below), and it happens in code like this:
{code}
if (s->current.server->ip == 0) {
ink_release_assert(s->current.request_to == PARENT_PROXY ||
s->http_config_param->no_dns_forward_to_parent != 0);
if (s->current.request_to == PARENT_PROXY) {
{code}
What happens is that .server->ip is indeed 0, but current.request_to is !=
PARENT_PROXY (it is instead ORIGIN_SERVER). I've not seen this before, and it
reproduces rarely, so wondering if it could be IPv6 related.
Crasher:
{code}
(gdb) bt
#0 0x0000003f2de327f5 in raise (sig=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x0000003f2de33fd5 in abort () at abort.c:92
#2 0x00000000006407a1 in ink_die_die_die (return_code=<value optimized out>,
message_format=<value optimized out>, ap=0x2b0756137600) at ink_error.cc:43
#3 ink_fatal_va(int, const char *, typedef __va_list_tag __va_list_tag *)
(return_code=<value optimized out>, message_format=<value optimized out>,
ap=0x2b0756137600) at ink_error.cc:65
#4 0x00000000006408d6 in ink_fatal (return_code=<value optimized out>,
message_format=<value optimized out>) at ink_error.cc:73
#5 0x000000000063f761 in _ink_assert (a=0x668400 "s->current.request_to ==
PARENT_PROXY || s->http_config_param->no_dns_forward_to_parent != 0", f=<value
optimized out>, l=2952) at ink_assert.cc:44
#6 0x0000000000516d5c in HttpTransact::HandleCacheOpenReadMiss
(s=0x2b0763638018) at HttpTransact.cc:2952
#7 0x00000000004f08e2 in HttpSM::call_transact_and_set_next_state
(this=0x2b0763637fb0, f=<value optimized out>) at HttpSM.cc:6339
#8 0x00000000004fffda in HttpSM::handle_api_return (this=0x2b0763637fb0) at
HttpSM.cc:1520
#9 0x00000000004f2d42 in HttpSM::state_hostdb_lookup (this=<value optimized
out>, event=<value optimized out>, data=<value optimized out>) at HttpSM.cc:2064
#10 0x0000000000503de0 in HttpSM::main_handler (this=0x2b0763637fb0, event=500,
data=0x2b0760231860) at HttpSM.cc:2454
#11 0x000000000058d07b in handleEvent (cont=0x2b0763637fb0, ar=0x2b0760231860)
at ../../iocore/eventsystem/I_Continuation.h:146
#12 reply_to_cont (cont=0x2b0763637fb0, ar=0x2b0760231860) at HostDB.cc:552
#13 0x000000000058e939 in HostDBContinuation::dnsEvent (this=<value optimized
out>, event=<value optimized out>, e=<value optimized out>) at HostDB.cc:1504
#14 0x000000000059d281 in handleEvent (this=0x2a1c340, event=<value optimized
out>, e=<value optimized out>) at ../../iocore/eventsystem/I_Continuation.h:146
#15 DNSEntry::postEvent (this=0x2a1c340, event=<value optimized out>, e=<value
optimized out>) at DNS.cc:1265
#16 0x0000000000638204 in handleEvent (this=0x2b0755e36010, e=0x2a61090,
calling_code=1) at I_Continuation.h:146
#17 EThread::process_event (this=0x2b0755e36010, e=0x2a61090, calling_code=1)
at UnixEThread.cc:140
#18 0x0000000000638c7b in EThread::execute (this=0x2b0755e36010) at
UnixEThread.cc:189
#19 0x0000000000637052 in spawn_thread_internal (a=0x1b206b0) at Thread.cc:88
#20 0x0000003f2e6068e0 in start_thread (arg=0x2b0756138710) at
pthread_create.c:297
#21 0x0000003f2dee0c9d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#22 0x0000000000000000 in ?? ()
(gdb) frame 6
#6 0x0000000000516d5c in HttpTransact::HandleCacheOpenReadMiss
(s=0x2b0763638018) at HttpTransact.cc:2952
2952 s->http_config_param->no_dns_forward_to_parent != 0);
(gdb) print s->current.request_to
$1 = ORIGIN_SERVER
(gdb) print s->current.server->ip
$2 = 0
{code}
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