Leif Hedstrom created TS-4844:
---------------------------------
Summary: Crash in HttpSM::state_cache_open_write
Key: TS-4844
URL: https://issues.apache.org/jira/browse/TS-4844
Project: Traffic Server
Issue Type: Bug
Components: HTTP
Reporter: Leif Hedstrom
We're seeing this crash, particularly (maybe even only) when we reload
configurations on a running system:
{code}
#0 0x00002aaaaac8d08d in HttpSM::state_cache_open_write (this=0x2ae4964b4600,
event=1109, data=0x2ae993968000) at HttpSM.cc:2503
#1 0x00002aaaaac9da9d in HttpSM::main_handler (this=0x2ae4964b4600,
event=1109, data=0x2ae993968000) at HttpSM.cc:2661
#2 0x00002aaaaae8c650 in Continuation::handleEvent (data=0x2ae993968000,
event=1109, this=<optimized out>) at I_Continuation.h:153
#3 EThread::process_event (this=0x2aaab3208000, e=0x2ae993968000,
calling_code=1109) at UnixEThread.cc:148
#4 0x00002aaaaae8d47b in EThread::execute (this=0x2aaab3208000) at
UnixEThread.cc:202
#5 0x00002aaaaae8c026 in spawn_thread_internal (a=0x2aaab0b25dc0) at
Thread.cc:86
#6 0x00002aaaad6b3aa1 in start_thread (arg=0x2aaab480f700) at
pthread_create.c:301
#7 0x00002aaaae8bc93d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:115
{code}
Discussed with amc about what this could be, looking at the code, it seems
related to the "new" option proxy.config.http.cache.open_write_fail_action.
We've started turning off this setting for now.
The root cause of the crash is
{code}
(gdb) p cache_sm.cache_read_vc
$1 = (CacheVConnection *) 0x0
{code}
I.e. we end up in the CACHE_EVENT_OPEN_READ case, falling through from
CACHE_EVENT_OPEN_WRITE_FAILED (which is the value of event):
{code}
(gdb) p event
$2 = 1109
{code}
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