[GitHub] [trafficserver] randall commented on pull request #6994: Adds null check

[GitBox <gi...@apache.org>]

randall commented on pull request #6994:
URL: https://github.com/apache/trafficserver/pull/6994#issuecomment-656378777


   This is the stack for the crash:
   ```
       frame #0: 0x0000000100115d7c traffic_server`Http1ServerSession::get_netvc(this=0x0000000000000000) const at Http1ServerSession.cc:211:10
       frame #1: 0x00000001000f3239 traffic_server`HttpSM::state_http_server_open(this=0x0000001ded10a240, event=201, data=0xffffffffffffffbf) at HttpSM.cc:1812:42
       frame #2: 0x00000001000e303a traffic_server`HttpSM::main_handler(this=0x0000001ded10a240, event=201, data=0xffffffffffffffbf) at HttpSM.cc:2618:5
       frame #3: 0x0000000100004f4f traffic_server`Continuation::handleEvent(this=0x0000001ded10a240, event=201, data=0xffffffffffffffbf) at I_Continuation.h:190:12
       frame #4: 0x00000001004b3f1d traffic_server`UnixNetVConnection::connectUp(this=0x000000217a43cf30, t=0x00000000099a4300, fd=-1) at UnixNetVConnection.cc:1280:25
       frame #5: 0x00000001004aae48 traffic_server`UnixNetProcessor::connect_re_internal(this=0x00000001006d9070, cont=0x0000001ded10a240, target=0x0000001ded10a978, opt=0x000000000b7de1f0) at UnixNetProcessor.cc:245:17
       frame #6: 0x0000000100037d60 traffic_server`NetProcessor::connect_re(this=0x00000001006d9070, cont=0x0000001ded10a240, addr=0x0000001ded10a978, opts=0x000000000b7de1f0) at P_UnixNetProcessor.h:62:49
       frame #7: 0x00000001000ec3ba traffic_server`HttpSM::do_http_server_open(this=0x0000001ded10a240, raw=false) at HttpSM.cc:5163:42
       frame #8: 0x0000000100109a0f traffic_server`HttpSM::set_next_state(this=0x0000001ded10a240) at HttpSM.cc:7485:5
       frame #9: 0x00000001000e713e traffic_server`HttpSM::call_transact_and_set_next_state(this=0x0000001ded10a240, f=0x0000000000000000)(HttpTransact::State*)) at HttpSM.cc:7288:3
       frame #10: 0x00000001000fa379 traffic_server`HttpSM::state_cache_open_write(this=0x0000001ded10a240, event=1108, data=0x0000001ded4cd4e0) at HttpSM.cc:2505:3
       frame #11: 0x00000001000e303a traffic_server`HttpSM::main_handler(this=0x0000001ded10a240, event=1108, data=0x0000001ded4cd4e0) at HttpSM.cc:2618:5
       frame #12: 0x0000000100004f4f traffic_server`Continuation::handleEvent(this=0x0000001ded10a240, event=1108, data=0x0000001ded4cd4e0) at I_Continuation.h:190:12
       frame #13: 0x00000001000949a4 traffic_server`HttpCacheSM::state_cache_open_write(this=0x0000001ded10c018, event=1108, data=0x0000001ded4cd4e0) at HttpCacheSM.cc:171:16
       frame #14: 0x0000000100004f4f traffic_server`Continuation::handleEvent(this=0x0000001ded10c018, event=1108, data=0x0000001ded4cd4e0) at I_Continuation.h:190:12
       frame #15: 0x000000010037a7c3 traffic_server`CacheVC::callcont(this=0x0000001ded4cd4e0, event=1108) at P_CacheInternal.h:639:25
       frame #16: 0x000000010037c646 traffic_server`Cache::open_write(this=0x0000001d782dbfd0, cont=0x0000001ded10c018, key=0x000000000b7df220, info=0x0000000000000000, apin_in_cache=0, (null)=0x0000000000000000, type=CACHE_FRAG_TYPE_HTTP, hostname="XXXX", host_len=4) at CacheWrite.cc:1824:6
       frame #17: 0x0000000100325f89 traffic_server`CacheProcessor::open_write(this=0x00000001006d7920, cont=0x0000001ded10c018, expected_size=0, key=0x000000000b7df210, request=0x0000001ded10a9f8, old_info=0x0000000000000000, pin_in_cache=0, type=CACHE_FRAG_TYPE_HTTP) at Cache.cc:3160:24
       frame #18: 0x0000000100095200 traffic_server`HttpCacheSM::open_write(this=0x0000001ded10c018, key=0x000000000b7df210, url=0x0000001ded10a380, request=0x0000001ded10a9f8, old_info=0x0000000000000000, pin_in_cache=0, retry=true, allow_multiple=false) at HttpCacheSM.cc:363:20
       frame #19: 0x0000000100104747 traffic_server`HttpSM::do_cache_prepare_action(this=0x0000001ded10a240, c_sm=0x0000001ded10c018, object_read_info=0x0000000000000000, retry=true, allow_multiple=false) at HttpSM.cc:4705:11
       frame #20: 0x000000010010aa38 traffic_server`HttpSM::do_cache_prepare_write(this=0x0000001ded10a240) at HttpSM.cc:4634:3
   ```


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