[TS-156] Enabling serve_stale_for crashes traffic_server with SRV records enabled crashes

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Invalid
• Fix Version/s: 2.1.2
• Assignee: Unassigned
• Reporter: Leif Hedstrom
• Created: 09/Feb/10 17:22
• Updated: 25/Aug/10 02:52
• Resolved: 02/Jul/10 03:26

Description

(This is moved from Y! Bugzilla ticket 2561190, originally posted by Leif Hedstrom on 2009-02-25):

We've been testing 1.17.13 on a production box, and activated the new features that we've been adding. This causes TS
to crash fairly frequently, and I've tracked this down to this configuration:

CONFIG proxy.config.hostdb.serve_stale_for INT 60

setting this back to 0 (which disabled this new feature) eliminates the crashes.

Comment #5 (Leif Hedstrom):

So, it seems this only triggers IF the SRV records feature is enabled as well. I.e.

CONFIG proxy.config.srv_enabled INT 1

I've examined the code for the serve_stale_for feature, and it seems good. However, the SRV records feature is all
brand new code, and rather untested.

Comment #4 (Leif Hedstrom):

This is a more likely stack trace (thanks Bryan for reminding me about our fantastic stack trace feature that logs the
traces into traffic.log):

0x083BCD02:bin/traffic_server:ink_atomiclist_push
0x082D158E:bin/traffic_server:probe(ProxyMutex*, INK_MD5&, char*, int, int, int, void*, bool, bool)
0x082D1597:bin/traffic_server:probe(ProxyMutex*, INK_MD5&, char*, int, int, int, void*, bool, bool)
0x081C9DD3:bin/traffic_server:HttpTransact::delete_srv_entry(HttpTransact::State*, int)
0x081CB363:bin/traffic_server:HttpTransact::handle_response_from_server(HttpTransact::State*)
0x081CB9CE:bin/traffic_server:HttpTransact::HandleResponse(HttpTransact::State*)
0x081DFF7B:bin/traffic_server:HttpSM::call_transact_and_set_next_state(void (HttpTransact::State*))
0x081E3D57:bin/traffic_server:HttpSM::handle_server_setup_error(int, void*)
0x081E721A:bin/traffic_server:HttpSM::state_read_server_response_header(int, void*)
0x081E69A2:bin/traffic_server:HttpSM::main_handler(int, void*)
0x0832B69F:bin/traffic_server:UnixNetVConnection::net_read_io(NetHandler*, EThread*)
0x08330AB5:bin/traffic_server:NetHandler::mainNetEvent(int, Event*)
0x0834B9C2:bin/traffic_server:EThread::process_event(Event*, int)
0x0834CAFE:bin/traffic_server:EThread::execute()
0x0812CB83:bin/traffic_server:main
0x00418DE3:/lib/tls/libc.so.6:__libc_start_main
0x080D6CA1:bin/traffic_server:__gxx_personality_v0
0x080D6CA1:bin/traffic_server:__gxx_personality_v0
0x080D6CA1:bin/traffic_server:__gxx_personality_v0
0x080D6CA1:bin/traffic_server:__gxx_personality_v0