ywkaras commented on PR #11164:
URL: https://github.com/apache/trafficserver/pull/11164#issuecomment-2005519574

   This is traffic.out for ATS in the failing ramp test (from the CI artifacts):
   ```
   [Mar 18 09:30:00.271] traffic_server NOTE: records parsing completed.
   [Mar 18 09:30:00.271] traffic_server NOTE: 
/tmp/sandbox/ramp/ts/config/records.yaml finished loading
   [Mar 18 09:30:00.277] traffic_server NOTE: Traffic Server is running 
unprivileged, not switching to user 'nobody'
   Fatal: ../src/proxy/http/HttpSM.cc:2979: failed assertion `event == 
HTTP_TUNNEL_EVENT_DONE || event == VC_EVENT_INACTIVITY_TIMEOUT`
   NOTE: using the environment variable TS_RUNROOT
   [Mar 18 09:30:00.667] traffic_crashlo NOTE: crashlog started, target=17568, 
debug=false syslog=true, uid=1200 euid=1200
   [Mar 18 09:30:00.669] traffic_crashlo NOTE: logging to 0x11de4e0
   [Mar 18 09:30:00.671] traffic_crashlo ERROR: wrote crash log to 
/tmp/sandbox/ramp/ts/log/crash-2024-03-18-093000.log
   traffic_server: received signal 6 (Aborted)
   traffic_server - STACK TRACE: 
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_Z19crash_logger_invokeiP9siginfo_tPv+0xce)[0x87bb76]
   /lib64/libc.so.6(+0x3e9a0)[0x7f64e13939a0]
   /lib64/libc.so.6(+0x90834)[0x7f64e13e5834]
   /lib64/libc.so.6(raise+0x1e)[0x7f64e13938ee]
   /lib64/libc.so.6(abort+0xdf)[0x7f64e137b8ff]
   /tmp/sandbox/ramp/ts/bin/traffic_server(_Z11ink_warningPKcz+0x0)[0x8b1718]
   /tmp/sandbox/ramp/ts/bin/traffic_server[0x8ade2e]
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_ZN6HttpSM14tunnel_handlerEiPv+0x12a)[0x9107ba]
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_ZN6HttpSM12main_handlerEiPv+0x254)[0x90ef44]
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_ZN12Continuation11handleEventEiPv+0xdd)[0x881869]
   /tmp/sandbox/ramp/ts/bin/traffic_server[0xc01141]
   /tmp/sandbox/ramp/ts/bin/traffic_server[0xc01592]
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_Z15write_to_net_ioP10NetHandlerP18UnixNetVConnectionP7EThread+0x92b)[0xc02964]
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_Z12write_to_netP10NetHandlerP18UnixNetVConnectionP7EThread+0x3f)[0xc02036]
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_ZN18UnixNetVConnection12net_write_ioEP10NetHandlerP7EThread+0x2b)[0xc0409f]
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_ZN10NetHandler18process_ready_listEv+0x16d)[0xc2f761]
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_ZN10NetHandler15waitForActivityEl+0x150)[0xc2fa12]
   
/tmp/sandbox/ramp/ts/bin/traffic_server(_ZN7EThread15execute_regularEv+0x482)[0xc6b634]
   /tmp/sandbox/ramp/ts/bin/traffic_server(_ZN7EThread7executeEv+0xf9)[0xc6b7c9]
   /tmp/sandbox/ramp/ts/bin/traffic_server[0xc6a14a]
   /lib64/libc.so.6(+0x8e897)[0x7f64e13e3897]
   /lib64/libc.so.6(clone+0x44)[0x7f64e146a674]
   ```
   
https://github.com/apache/trafficserver/blob/e1e8e434d3b3b27561a14bc09fec3d37c4ec0dc2/src/proxy/http/HttpSM.cc#L2979
   
   I turned on the "http" debug tag:
   ```
   -ts.Disk.records_config.update({'proxy.config.log.max_secs_per_buffer': 1})
   +ts.Disk.records_config.update({
   +    'proxy.config.log.max_secs_per_buffer': 1,
   +    'proxy.config.diags.debug.enabled': 1,
   +    'proxy.config.diags.debug.tags': 'http$'
   +})
   ```
   This caused the test to fail in my local test environment, but I can't see 
exactly why.  The return code from the TS process was -6.  These were the final 
debug traces:
   ```
   [Mar 18 18:07:10.375] [ET_NET 7] DIAG: <HttpSM.cc:2977 (tunnel_handler)> 
(http) [136] [&HttpSM::tunnel_handler, HTTP_TUNNEL_EVENT_DONE]
   [Mar 18 18:07:10.374] [ET_NET 15] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [268] State Transition: 
SM_ACTION_DNS_LOOKUP -> SM_ACTION_API_OS_DNS
   [Mar 18 18:07:10.375] [ET_NET 13] DIAG: <HttpSM.cc:2529 
(state_cache_open_read)> (http) [985] [&HttpSM::state_cache_open_read, 
CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED]
   [Mar 18 18:07:10.375] [ET_NET 2] DIAG: <HttpSM.cc:2051 
(state_send_server_request_header)> (http) [786] 
[&HttpSM::state_send_server_request_header, 
VC_EVENT_WRITE_COMPLETE/TS_EVENT_VCONN_WRITE_COMPLETE]
   [Mar 18 18:07:10.375] [ET_NET 13] DIAG: <HttpSM.cc:2563 
(state_cache_open_read)> (http) [985] cache_open_read - 
CACHE_EVENT_OPEN_READ_FAILED with ECACHE_NO_DOC (20400)
   [Mar 18 18:07:10.375] [ET_NET 15] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [268] State Transition: 
SM_ACTION_API_OS_DNS -> SM_ACTION_CACHE_ISSUE_WRITE
   [Mar 18 18:07:10.375] [ET_NET 13] DIAG: <HttpSM.cc:2566 
(state_cache_open_read)> (http) [985] open read failed.
   [Mar 18 18:07:10.375] [ET_NET 2] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [593] VC_EVENT_WRITE_READY/TS_EVENT_VCONN_WRITE_READY, 101
   [Mar 18 18:07:10.375] [ET_NET 6] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [665] CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED, 1103
   
/home/wkaras/REPOS/TS/tests/_sandbox/ramp/ts/bin/traffic_server(_ZN7EThread15execute_regularEv+0x479)[0xd17315]
   [Mar 18 18:07:10.375] [ET_NET 11] DIAG: <HttpSM.cc:2529 
(state_cache_open_read)> (http) [904] [&HttpSM::state_cache_open_read, 
CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED]
   [Mar 18 18:07:10.375] [ET_NET 6] DIAG: <HttpSM.cc:2529 
(state_cache_open_read)> (http) [665] [&HttpSM::state_cache_open_read, 
CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED]
   [Mar 18 18:07:10.375] [ET_NET 4] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [996] CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED, 1103
   [Mar 18 18:07:10.375] [ET_NET 6] DIAG: <HttpSM.cc:2563 
(state_cache_open_read)> (http) [665] cache_open_read - 
CACHE_EVENT_OPEN_READ_FAILED with ECACHE_NO_DOC (20400)
   [Mar 18 18:07:10.375] [ET_NET 3] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [200] CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED, 
1109
   [Mar 18 18:07:10.375] [ET_NET 0] DIAG: <HttpSM.cc:2529 
(state_cache_open_read)> (http) [512] [&HttpSM::state_cache_open_read, 
CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED]
   [Mar 18 18:07:10.375] [ET_NET 1] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [585] State Transition: 
SM_ACTION_CACHE_LOOKUP -> SM_ACTION_DNS_LOOKUP
   [Mar 18 18:07:10.375] [ET_NET 0] DIAG: <HttpSM.cc:2563 
(state_cache_open_read)> (http) [512] cache_open_read - 
CACHE_EVENT_OPEN_READ_FAILED with ECACHE_NO_DOC (20400)
   [Mar 18 18:07:10.375] [ET_NET 7] DIAG: <HttpSM.cc:1402 (state_api_callout)> 
(http) [136] calling plugin on hook TS_HTTP_TXN_CLOSE_HOOK at hook 
0x7f24f8045e80
   [Mar 18 18:07:10.375] [ET_NET 1] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [585] State Transition: 
SM_ACTION_DNS_LOOKUP -> SM_ACTION_API_OS_DNS
   [Mar 18 18:07:10.375] [ET_NET 0] DIAG: <HttpSM.cc:2566 
(state_cache_open_read)> (http) [512] open read failed.
   [Mar 18 18:07:10.374] [ET_NET 5] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [814] CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED, 
1109
   [Mar 18 18:07:10.375] [ET_NET 2] DIAG: <HttpSM.cc:1743 
(state_http_server_open)> (http) [593] [&HttpSM::state_http_server_open, 
VC_EVENT_WRITE_READY/TS_EVENT_VCONN_WRITE_READY]
   [Mar 18 18:07:10.375] [ET_NET 5] DIAG: <HttpSM.cc:2408 
(state_cache_open_write)> (http) [814] [&HttpSM : state_cache_open_write, 
CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED]
   [Mar 18 18:07:10.375] [ET_NET 8] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [876] State Transition: 
SM_ACTION_CACHE_ISSUE_WRITE -> SM_ACTION_ORIGIN_SERVER_OPEN
   [Mar 18 18:07:10.375] [ET_NET 2] DIAG: <HttpSM.cc:6621 
(setup_server_read_response_header)> (http) [593] Setting up the header read
   [Mar 18 18:07:10.375] [ET_NET 8] DIAG: <HttpTransact.h:942 
(set_connect_fail)> (http) Setting upstream connection failure 0 to 5
   [Mar 18 18:07:10.375] [ET_NET 6] DIAG: <HttpSM.cc:2566 
(state_cache_open_read)> (http) [665] open read failed.
   [Mar 18 18:07:10.375] [ET_NET 8] DIAG: <HttpSM.cc:5277 
(do_http_server_open)> (http) [876] open connection to ex.two: 127.0.0.1:61005
   [Mar 18 18:07:10.375] [ET_NET 3] DIAG: <HttpSM.cc:2408 
(state_cache_open_write)> (http) [200] [&HttpSM : state_cache_open_write, 
CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED]
   [Mar 18 18:07:10.375] [ET_NET 8] DIAG: <HttpTransact.h:942 
(set_connect_fail)> (http) Setting upstream connection failure 5 to 5
   [Mar 18 18:07:10.375] [ET_NET 12] DIAG: <HttpSM.cc:1743 
(state_http_server_open)> (http) [288] [&HttpSM::state_http_server_open, 
unknown event]
   [Mar 18 18:07:10.374] [ET_NET 10] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [684] State Transition: 
SM_ACTION_CACHE_LOOKUP -> SM_ACTION_DNS_LOOKUP
   [Mar 18 18:07:10.375] [ET_NET 12] DIAG: <HttpSM.cc:5277 
(do_http_server_open)> (http) [288] open connection to three.ex: 127.0.0.1:61005
   [Mar 18 18:07:10.375] [ET_NET 10] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [684] State Transition: 
SM_ACTION_DNS_LOOKUP -> SM_ACTION_API_OS_DNS
   [Mar 18 18:07:10.375] [ET_NET 0] DIAG: <HttpTransact.cc:2631 
(CallOSDNSLookup)> (http) [512] ex.two 
   [Mar 18 18:07:10.375] [ET_NET 13] DIAG: <HttpTransact.cc:2631 
(CallOSDNSLookup)> (http) [985] three.ex 
   [Mar 18 18:07:10.375] [ET_NET 5] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [814] State Transition: 
SM_ACTION_CACHE_ISSUE_WRITE -> SM_ACTION_ORIGIN_SERVER_OPEN
   [Mar 18 18:07:10.375] [ET_NET 11] DIAG: <HttpSM.cc:2563 
(state_cache_open_read)> (http) [904] cache_open_read - 
CACHE_EVENT_OPEN_READ_FAILED with ECACHE_NO_DOC (20400)
   [Mar 18 18:07:10.375] [ET_NET 5] DIAG: <HttpTransact.h:942 
(set_connect_fail)> (http) Setting upstream connection failure 0 to 5
   [Mar 18 18:07:10.375] [ET_NET 11] DIAG: <HttpSM.cc:2566 
(state_cache_open_read)> (http) [904] open read failed.
   [Mar 18 18:07:10.375] [ET_NET 6] DIAG: <HttpTransact.cc:2631 
(CallOSDNSLookup)> (http) [665] ex.two 
   [Mar 18 18:07:10.375] [ET_NET 5] DIAG: <HttpSM.cc:5277 
(do_http_server_open)> (http) [814] open connection to three.ex: 127.0.0.1:61005
   [Mar 18 18:07:10.375] [ET_NET 2] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [593] VC_EVENT_WRITE_COMPLETE/TS_EVENT_VCONN_WRITE_COMPLETE, 103
   [Mar 18 18:07:10.375] [ET_NET 3] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [200] State Transition: 
SM_ACTION_CACHE_ISSUE_WRITE -> SM_ACTION_ORIGIN_SERVER_OPEN
   [Mar 18 18:07:10.375] [ET_NET 5] DIAG: <HttpSM.cc:6621 
(setup_server_read_response_header)> (http) [814] Setting up the header read
   
/home/wkaras/REPOS/TS/tests/_sandbox/ramp/ts/bin/traffic_server(_ZN7EThread7executeEv+0xf9)[0xd174a9]
   [Mar 18 18:07:10.375] [ET_NET 7] DIAG: <HttpSM.cc:1291 (state_api_callback)> 
(http) [136] [&HttpSM::state_api_callback, 
HTTP_API_CONTINUE/TS_EVENT_HTTP_CONTINUE]
   [Mar 18 18:07:10.375] [ET_NET 1] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [585] State Transition: 
SM_ACTION_API_OS_DNS -> SM_ACTION_CACHE_ISSUE_WRITE
   [Mar 18 18:07:10.375] [ET_NET 12] DIAG: <HttpSM.cc:5630 
(do_http_server_open)> (http) [288] calling netProcessor.connect_re
   [Mar 18 18:07:10.375] [ET_NET 10] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [684] State Transition: 
SM_ACTION_API_OS_DNS -> SM_ACTION_CACHE_ISSUE_WRITE
   [Mar 18 18:07:10.375] [ET_NET 0] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [512] State Transition: 
SM_ACTION_CACHE_LOOKUP -> SM_ACTION_DNS_LOOKUP
   [Mar 18 18:07:10.375] [ET_NET 1] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [628] CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED, 1103
   [Mar 18 18:07:10.375] [ET_NET 13] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [985] State Transition: 
SM_ACTION_CACHE_LOOKUP -> SM_ACTION_DNS_LOOKUP
   [Mar 18 18:07:10.375] [ET_NET 10] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [919] CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED, 1103
   [Mar 18 18:07:10.375] [ET_NET 4] DIAG: <HttpSM.cc:2529 
(state_cache_open_read)> (http) [996] [&HttpSM::state_cache_open_read, 
CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED]
   [Mar 18 18:07:10.376] [ET_NET 10] DIAG: <HttpSM.cc:2529 
(state_cache_open_read)> (http) [919] [&HttpSM::state_cache_open_read, 
CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED]
   [Mar 18 18:07:10.376] [ET_NET 13] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [985] State Transition: 
SM_ACTION_DNS_LOOKUP -> SM_ACTION_API_OS_DNS
   [Mar 18 18:07:10.376] [ET_NET 4] DIAG: <HttpSM.cc:2563 
(state_cache_open_read)> (http) [996] cache_open_read - 
CACHE_EVENT_OPEN_READ_FAILED with ECACHE_NO_DOC (20400)
   [Mar 18 18:07:10.375] [ET_NET 6] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [665] State Transition: 
SM_ACTION_CACHE_LOOKUP -> SM_ACTION_DNS_LOOKUP
   [Mar 18 18:07:10.376] [ET_NET 4] DIAG: <HttpSM.cc:2566 
(state_cache_open_read)> (http) [996] open read failed.
   [Mar 18 18:07:10.375] [ET_NET 2] DIAG: <HttpSM.cc:2051 
(state_send_server_request_header)> (http) [593] 
[&HttpSM::state_send_server_request_header, 
VC_EVENT_WRITE_COMPLETE/TS_EVENT_VCONN_WRITE_COMPLETE]
   [Mar 18 18:07:10.376] [ET_NET 12] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [288] NET_EVENT_OPEN/TS_EVENT_NET_CONNECT, 200
   [Mar 18 18:07:10.376] [ET_NET 6] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [665] State Transition: 
SM_ACTION_DNS_LOOKUP -> SM_ACTION_API_OS_DNS
   [Mar 18 18:07:10.375] [ET_NET 3] DIAG: <HttpTransact.h:942 
(set_connect_fail)> (http) Setting upstream connection failure 0 to 5
   [Mar 18 18:07:10.376] [ET_NET 6] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [665] State Transition: 
SM_ACTION_API_OS_DNS -> SM_ACTION_CACHE_ISSUE_WRITE
   [Mar 18 18:07:10.376] [ET_NET 3] DIAG: <HttpSM.cc:5277 
(do_http_server_open)> (http) [200] open connection to ex.two: 127.0.0.1:61005
   [Mar 18 18:07:10.376] [ET_NET 3] DIAG: <HttpTransact.h:942 
(set_connect_fail)> (http) Setting upstream connection failure 5 to 5
   [Mar 18 18:07:10.375] [ET_NET 5] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [460] CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED, 
1109
   [Mar 18 18:07:10.375] [ET_NET 7] DIAG: <HttpSM.cc:1331 (state_api_callout)> 
(http) [136] [&HttpSM::state_api_callout, 
HTTP_API_CONTINUE/TS_EVENT_HTTP_CONTINUE]
   [Mar 18 18:07:10.376] [ET_NET 1] DIAG: <HttpSM.cc:2529 
(state_cache_open_read)> (http) [628] [&HttpSM::state_cache_open_read, 
CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED]
   [Mar 18 18:07:10.376] [ET_NET 5] DIAG: <HttpSM.cc:2408 
(state_cache_open_write)> (http) [460] [&HttpSM : state_cache_open_write, 
CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED]
   [Mar 18 18:07:10.376] [ET_NET 1] DIAG: <HttpSM.cc:2563 
(state_cache_open_read)> (http) [628] cache_open_read - 
CACHE_EVENT_OPEN_READ_FAILED with ECACHE_NO_DOC (20400)
   [Mar 18 18:07:10.376] [ET_NET 7] DIAG: <HttpSM.cc:7517 (kill_this)> (http) 
[136] deallocating sm
   [Mar 18 18:07:10.375] [ET_NET 11] DIAG: <HttpTransact.cc:2631 
(CallOSDNSLookup)> (http) [904] ex.two 
   [Mar 18 18:07:10.375] [ET_NET 9] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [406] CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED, 1103
   [Mar 18 18:07:10.376] [ET_NET 13] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [985] State Transition: 
SM_ACTION_API_OS_DNS -> SM_ACTION_CACHE_ISSUE_WRITE
   [Mar 18 18:07:10.376] [ET_NET 4] DIAG: <HttpTransact.cc:2631 
(CallOSDNSLookup)> (http) [996] three.ex 
   [Mar 18 18:07:10.375] [ET_NET 8] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [891] CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED, 
1109
   [Mar 18 18:07:10.376] [ET_NET 4] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [996] State Transition: 
SM_ACTION_CACHE_LOOKUP -> SM_ACTION_DNS_LOOKUP
   [Mar 18 18:07:10.376] [ET_NET 12] DIAG: <HttpSM.cc:1743 
(state_http_server_open)> (http) [288] [&HttpSM::state_http_server_open, 
NET_EVENT_OPEN/TS_EVENT_NET_CONNECT]
   [Mar 18 18:07:10.376] [ET_NET 4] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [996] State Transition: 
SM_ACTION_DNS_LOOKUP -> SM_ACTION_API_OS_DNS
   [Mar 18 18:07:10.376] [ET_NET 2] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [584] VC_EVENT_WRITE_READY/TS_EVENT_VCONN_WRITE_READY, 101
   [Mar 18 18:07:10.376] [ET_NET 6] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [496] VC_EVENT_READ_READY/TS_EVENT_VCONN_READ_READY, 100
   [Mar 18 18:07:10.376] [ET_NET 4] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [996] State Transition: 
SM_ACTION_API_OS_DNS -> SM_ACTION_CACHE_ISSUE_WRITE
   [Mar 18 18:07:10.376] [ET_NET 3] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [212] CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED, 
1109
   [Mar 18 18:07:10.376] [ET_NET 0] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [512] State Transition: 
SM_ACTION_DNS_LOOKUP -> SM_ACTION_API_OS_DNS
   /home/wkaras/REPOS/TS/tests/_sandbox/ramp/ts/bin/traffic_server[0xd15e34]
   [Mar 18 18:07:10.376] [ET_NET 3] DIAG: <HttpSM.cc:2408 
(state_cache_open_write)> (http) [212] [&HttpSM : state_cache_open_write, 
CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED]
   /lib64/libpthread.so.0(+0x81ca)[0x7f253955c1ca]
   [Mar 18 18:07:10.376] [ET_NET 0] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [512] State Transition: 
SM_ACTION_API_OS_DNS -> SM_ACTION_CACHE_ISSUE_WRITE
   [Mar 18 18:07:10.376] [ET_NET 10] DIAG: <HttpSM.cc:2563 
(state_cache_open_read)> (http) [919] cache_open_read - 
CACHE_EVENT_OPEN_READ_FAILED with ECACHE_NO_DOC (20400)
   /lib64/libc.so.6(clone+0x43)[0x7f25391c8e73]
   [Mar 18 18:07:10.376] [ET_NET 3] DIAG: <HttpSM.cc:7772 
(call_transact_and_set_next_state)> (http) [212] State Transition: 
SM_ACTION_CACHE_ISSUE_WRITE -> SM_ACTION_ORIGIN_SERVER_OPEN
   [Mar 18 18:07:10.376] [ET_NET 0] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [534] CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED, 1103
   [Mar 18 18:07:10.376] [ET_NET 9] DIAG: <HttpSM.cc:2529 
(state_cache_open_read)> (http) [406] [&HttpSM::state_cache_open_read, 
CACHE_EVENT_OPEN_READ_FAILED/TS_EVENT_CACHE_OPEN_READ_FAILED]
   [Mar 18 18:07:10.376] [ET_NET 3] DIAG: <HttpTransact.h:942 
(set_connect_fail)> (http) Setting upstream connection failure 0 to 5
   [Mar 18 18:07:10.376] [ET_NET 9] DIAG: <HttpSM.cc:2563 
(state_cache_open_read)> (http) [406] cache_open_read - 
CACHE_EVENT_OPEN_READ_FAILED with ECACHE_NO_DOC (20400)
   [Mar 18 18:07:10.376] [ET_NET 8] DIAG: <HttpSM.cc:2408 
(state_cache_open_write)> (http) [891] [&HttpSM : state_cache_open_write, 
CACHE_EVENT_OPEN_WRITE_FAILED/TS_EVENT_CACHE_OPEN_WRITE_FAILED]
   [Mar 18 18:07:10.376] [ET_NET 12] DIAG: <HttpSM.cc:2601 (main_handler)> 
(http) [393] unknown event, 1401
   ```
   The symbol for Event 1401 is CONNECT_EVENT_DIRECT.


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