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https://issues.apache.org/jira/browse/TS-4844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leif Hedstrom updated TS-4844:
------------------------------
Labels: A crash (was: crash)
> 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
> Priority: Blocker
> Labels: A, crash
> Fix For: 7.1.0
>
>
> 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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