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https://issues.apache.org/jira/browse/TS-3235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14286904#comment-14286904
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portl4t commented on TS-3235:
-----------------------------
Yeah, if a thread wants to schedule a continuation, it must holds the
continuation's lock first. So, if you want to schedule a continuation in the
customer's thread, you should hold the lock in the customer's thread. We don't
have to hold the lock explicitly in the Plugin if there are no customer's
thread, because the ats working thread had done this in the core code.
> PluginVC crashed with unrecognized event
> ----------------------------------------
>
> Key: TS-3235
> URL: https://issues.apache.org/jira/browse/TS-3235
> Project: Traffic Server
> Issue Type: Bug
> Components: CPP API, HTTP, Plugins
> Reporter: kang li
> Assignee: Brian Geffon
> Fix For: 5.3.0
>
> Attachments: pluginvc-crash.diff
>
>
> We are using atscppapi to create Intercept plugin.
>
> From the coredump , that seems Continuation of the InterceptPlugin was
> already been destroyed.
> {code}
> #0 0x000000375ac32925 in raise () from /lib64/libc.so.6
> #1 0x000000375ac34105 in abort () from /lib64/libc.so.6
> #2 0x00002b21eeae3458 in ink_die_die_die (retval=1) at ink_error.cc:43
> #3 0x00002b21eeae3525 in ink_fatal_va(int, const char *, typedef
> __va_list_tag __va_list_tag *) (return_code=1,
> message_format=0x2b21eeaf08d8 "%s:%d: failed assert `%s`",
> ap=0x2b21f4913ad0) at ink_error.cc:65
> #4 0x00002b21eeae35ee in ink_fatal (return_code=1,
> message_format=0x2b21eeaf08d8 "%s:%d: failed assert `%s`") at ink_error.cc:73
> #5 0x00002b21eeae2160 in _ink_assert (expression=0x76ddb8 "call_event ==
> core_lock_retry_event", file=0x76dd04 "PluginVC.cc", line=203)
> at ink_assert.cc:37
> #6 0x0000000000530217 in PluginVC::main_handler (this=0x2b24ef007cb8,
> event=1, data=0xe0f5b80) at PluginVC.cc:203
> #7 0x00000000004f5854 in Continuation::handleEvent (this=0x2b24ef007cb8,
> event=1, data=0xe0f5b80) at ../iocore/eventsystem/I_Continuation.h:146
> #8 0x0000000000755d26 in EThread::process_event (this=0x309b250,
> e=0xe0f5b80, calling_code=1) at UnixEThread.cc:145
> #9 0x000000000075610a in EThread::execute (this=0x309b250) at
> UnixEThread.cc:239
> #10 0x0000000000755284 in spawn_thread_internal (a=0x2849330) at Thread.cc:88
> #11 0x00002b21ef05f9d1 in start_thread () from /lib64/libpthread.so.0
> #12 0x000000375ace8b7d in clone () from /lib64/libc.so.6
> (gdb) p sm_lock_retry_event
> $13 = (Event *) 0x2b2496146e90
> (gdb) p core_lock_retry_event
> $14 = (Event *) 0x0
> (gdb) p active_event
> $15 = (Event *) 0x0
> (gdb) p inactive_event
> $16 = (Event *) 0x0
> (gdb) p *(INKContInternal*)this->core_obj->connect_to
> Cannot access memory at address 0x2b269cd46c10
> {code}
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