[jira] [Commented] (TS-3235) PluginVC crashed with unrecognized event

["Alan M. Carroll (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-3235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15047069#comment-15047069 ] 

Alan M. Carroll commented on TS-3235:
-------------------------------------

Yes, the Intercept plugin seems to assume it's running in an ET_NET thread and therefore has been dispatched with the continuation lock held. I think I will just have it grab that lock too - if it's in an {{ET_NET}} thread dispatch it's a cheap operation because the lock is already held, otherwise it's potentially expensive but necessary.

> 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: Alan M. Carroll
>             Fix For: 6.1.0
>
>         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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