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https://issues.apache.org/jira/browse/TS-3486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14593733#comment-14593733
 ] 

Eric Sproul commented on TS-3486:
---------------------------------

I realize now that the previous post was erroneous; I don't think that's the 
faulting thread.  I'm working on getting the right one.

> Segfault in do_io_write with plugin (??)
> ----------------------------------------
>
>                 Key: TS-3486
>                 URL: https://issues.apache.org/jira/browse/TS-3486
>             Project: Traffic Server
>          Issue Type: Bug
>    Affects Versions: 5.2.0, 5.3.0
>            Reporter: Qiang Li
>            Assignee: Phil Sorber
>              Labels: crash
>             Fix For: sometime
>
>         Attachments: ts3486-ptrace.txt.gz
>
>
> {code}
> (gdb) bt
> #0  0x00000000005bdb8b in HttpServerSession::do_io_write (this=<value 
> optimized out>, c=0x2aaadccc4bf0, nbytes=576, buf=0x2aaafc2ffee8, owner=false)
>     at HttpServerSession.cc:104
> #1  0x00000000005acc1d in HttpSM::setup_server_send_request 
> (this=0x2aaadccc4bf0) at HttpSM.cc:5686
> #2  0x00000000005b3f85 in HttpSM::handle_api_return (this=0x2aaadccc4bf0) at 
> HttpSM.cc:1520
> #3  0x00000000005b45f8 in HttpSM::state_api_callout (this=0x2aaadccc4bf0, 
> event=60000, data=0x0) at HttpSM.cc:1455
> #4  0x00000000005b980b in HttpSM::state_api_callback (this=0x2aaadccc4bf0, 
> event=60000, data=0x0) at HttpSM.cc:1275
> #5  0x00000000004d7a1b in TSHttpTxnReenable (txnp=0x2aaadccc4bf0, 
> event=TS_EVENT_HTTP_CONTINUE) at InkAPI.cc:5614
> #6  0x00002ba118441c89 in cachefun (contp=<value optimized out>, event=<value 
> optimized out>, edata=0x2aaadccc4bf0) at main.cpp:1876
> #7  0x00000000005b4466 in HttpSM::state_api_callout (this=0x2aaadccc4bf0, 
> event=<value optimized out>, data=<value optimized out>) at HttpSM.cc:1381
> #8  0x00000000005b627d in HttpSM::do_http_server_open (this=0x2aaadccc4bf0, 
> raw=<value optimized out>) at HttpSM.cc:4639
> #9  0x00000000005baa04 in HttpSM::set_next_state (this=0x2aaadccc4bf0) at 
> HttpSM.cc:7021
> #10 0x00000000005b25a3 in HttpSM::state_cache_open_write 
> (this=0x2aaadccc4bf0, event=1108, data=0x2aab1c3b6800) at HttpSM.cc:2442
> #11 0x00000000005b5b28 in HttpSM::main_handler (this=0x2aaadccc4bf0, 
> event=1108, data=0x2aab1c3b6800) at HttpSM.cc:2554
> #12 0x000000000059338a in handleEvent (this=0x2aaadccc6618, event=<value 
> optimized out>, data=0x2aab1c3b6800) at 
> ../../iocore/eventsystem/I_Continuation.h:145
> #13 HttpCacheSM::state_cache_open_write (this=0x2aaadccc6618, event=<value 
> optimized out>, data=0x2aab1c3b6800) at HttpCacheSM.cc:167
> #14 0x0000000000697223 in handleEvent (this=0x2aab1c3b6800, event=<value 
> optimized out>) at ../../iocore/eventsystem/I_Continuation.h:145
> #15 CacheVC::callcont (this=0x2aab1c3b6800, event=<value optimized out>) at 
> ../../iocore/cache/P_CacheInternal.h:662
> #16 0x0000000000715940 in Cache::open_write (this=<value optimized out>, 
> cont=<value optimized out>, key=0x2ba0ff762d70, info=<value optimized out>, 
>     apin_in_cache=46914401429576, type=CACHE_FRAG_TYPE_HTTP, 
>     hostname=0x2aaadd281078 
> "www.mifangba.comhttpapi.phpwww.mifangba.comhttp://www.mifangba.com/api.php?op=count&id=4&modelid=12";,
>  host_len=16) at CacheWrite.cc:1788
> #17 0x00000000006e5765 in open_write (this=<value optimized out>, 
> cont=0x2aaadccc6618, expected_size=<value optimized out>, url=0x2aaadccc5310, 
>     cluster_cache_local=<value optimized out>, request=<value optimized out>, 
> old_info=0x0, pin_in_cache=0, type=CACHE_FRAG_TYPE_HTTP) at 
> P_CacheInternal.h:1093
> #18 CacheProcessor::open_write (this=<value optimized out>, 
> cont=0x2aaadccc6618, expected_size=<value optimized out>, url=0x2aaadccc5310, 
>     cluster_cache_local=<value optimized out>, request=<value optimized out>, 
> old_info=0x0, pin_in_cache=0, type=CACHE_FRAG_TYPE_HTTP) at Cache.cc:3622
> #19 0x00000000005936f0 in HttpCacheSM::open_write (this=0x2aaadccc6618, 
> url=<value optimized out>, request=<value optimized out>, old_info=<value 
> optimized out>, 
>     pin_in_cache=<value optimized out>, retry=<value optimized out>, 
> allow_multiple=false) at HttpCacheSM.cc:298
> #20 0x00000000005a022e in HttpSM::do_cache_prepare_action 
> (this=0x2aaadccc4bf0, c_sm=0x2aaadccc6618, object_read_info=0x0, retry=true, 
> allow_multiple=false) at HttpSM.cc:4511
> #21 0x00000000005babd9 in do_cache_prepare_write (this=0x2aaadccc4bf0) at 
> HttpSM.cc:4436
> #22 HttpSM::set_next_state (this=0x2aaadccc4bf0) at HttpSM.cc:7098
> #23 0x00000000005b3f5f in HttpSM::handle_api_return (this=0x2aaadccc4bf0) at 
> HttpSM.cc:1517
> #24 0x00000000005b45f8 in HttpSM::state_api_callout (this=0x2aaadccc4bf0, 
> event=0, data=0x0) at HttpSM.cc:1455
> #25 0x00000000005ba712 in HttpSM::set_next_state (this=0x2aaadccc4bf0) at 
> HttpSM.cc:6876
> #26 0x00000000005ba702 in HttpSM::set_next_state (this=0x2aaadccc4bf0) at 
> HttpSM.cc:6919
> #27 0x00000000005b3f5f in HttpSM::handle_api_return (this=0x2aaadccc4bf0) at 
> HttpSM.cc:1517
> #28 0x00000000005b45f8 in HttpSM::state_api_callout (this=0x2aaadccc4bf0, 
> event=60000, data=0x0) at HttpSM.cc:1455
> #29 0x00000000005b980b in HttpSM::state_api_callback (this=0x2aaadccc4bf0, 
> event=60000, data=0x0) at HttpSM.cc:1275
> #30 0x00000000004d7a1b in TSHttpTxnReenable (txnp=0x2aaadccc4bf0, 
> event=TS_EVENT_HTTP_CONTINUE) at InkAPI.cc:5614
> #31 0x00002ba11844215d in service_from_this (contp=<value optimized out>, 
> event=<value optimized out>, edata=0x2aaadccc4bf0) at main.cpp:1498
> #32 cachefun (contp=<value optimized out>, event=<value optimized out>, 
> edata=0x2aaadccc4bf0) at main.cpp:1811
> #33 0x00000000005b4466 in HttpSM::state_api_callout (this=0x2aaadccc4bf0, 
> event=<value optimized out>, data=<value optimized out>) at HttpSM.cc:1381
> #34 0x00000000005b980b in HttpSM::state_api_callback (this=0x2aaadccc4bf0, 
> event=60000, data=0x0) at HttpSM.cc:1275
> #35 0x00000000004d7a1b in TSHttpTxnReenable (txnp=0x2aaadccc4bf0, 
> event=TS_EVENT_HTTP_CONTINUE) at InkAPI.cc:5614
> #36 0x00002ba1070e3275 in refresh_hook (contp=<value optimized out>, 
> event=<value optimized out>, edata=0x2aaadccc4bf0) at main.cpp:533
> #37 0x00000000005b4466 in HttpSM::state_api_callout (this=0x2aaadccc4bf0, 
> event=<value optimized out>, data=<value optimized out>) at HttpSM.cc:1381
> #38 0x00000000005b7a68 in do_api_callout (this=0x2aaadccc4bf0, event=1103, 
> data=0xffffffffffffb050) at HttpSM.cc:442
> #39 setup_cache_lookup_complete_api (this=0x2aaadccc4bf0, event=1103, 
> data=0xffffffffffffb050) at HttpSM.cc:2451
> #40 HttpSM::state_cache_open_read (this=0x2aaadccc4bf0, event=1103, 
> data=0xffffffffffffb050) at HttpSM.cc:2512
> ---Type <return> to continue, or q <return> to quit---
> #41 0x00000000005b5b28 in HttpSM::main_handler (this=0x2aaadccc4bf0, 
> event=1103, data=0xffffffffffffb050) at HttpSM.cc:2554
> #42 0x0000000000593a42 in handleEvent (this=0x2aaadccc6618, event=1103, 
> data=0xffffffffffffb050) at ../../iocore/eventsystem/I_Continuation.h:145
> #43 HttpCacheSM::state_cache_open_read (this=0x2aaadccc6618, event=1103, 
> data=0xffffffffffffb050) at HttpCacheSM.cc:131
> #44 0x0000000000703cae in Cache::open_read (this=<value optimized out>, 
> cont=0x2aaadccc6618, key=<value optimized out>, request=0x2aaadccc52f8, 
> params=0x2aaadccc4cd0, 
>     type=<value optimized out>, hostname=0x2aaadd281078 
> "www.mifangba.comhttpapi.phpwww.mifangba.comhttp://www.mifangba.com/api.php?op=count&id=4&modelid=12";,
>  host_len=16)
>     at CacheRead.cc:149
> #45 0x00000000006e153d in open_read (this=<value optimized out>, 
> cont=0x2aaadccc6618, url=0x2aaadccc5310, cluster_cache_local=<value optimized 
> out>, request=0x2aaadccc52f8, 
>     params=0x2aaadccc4cd0, pin_in_cache=0, type=CACHE_FRAG_TYPE_HTTP) at 
> P_CacheInternal.h:1074
> #46 CacheProcessor::open_read (this=<value optimized out>, 
> cont=0x2aaadccc6618, url=0x2aaadccc5310, cluster_cache_local=<value optimized 
> out>, request=0x2aaadccc52f8, 
>     params=0x2aaadccc4cd0, pin_in_cache=0, type=CACHE_FRAG_TYPE_HTTP) at 
> Cache.cc:3598
> #47 0x00000000005934f4 in do_cache_open_read (this=<value optimized out>, 
> url=<value optimized out>, hdr=<value optimized out>, params=<value optimized 
> out>, 
>     pin_in_cache=<value optimized out>) at HttpCacheSM.cc:211
> #48 HttpCacheSM::open_read (this=<value optimized out>, url=<value optimized 
> out>, hdr=<value optimized out>, params=<value optimized out>, 
> pin_in_cache=<value optimized out>)
>     at HttpCacheSM.cc:243
> #49 0x00000000005a0533 in HttpSM::do_cache_lookup_and_read 
> (this=0x2aaadccc4bf0) at HttpSM.cc:4389
> #50 0x00000000005bac3f in HttpSM::set_next_state (this=0x2aaadccc4bf0) at 
> HttpSM.cc:6986
> #51 0x00000000005b3f5f in HttpSM::handle_api_return (this=0x2aaadccc4bf0) at 
> HttpSM.cc:1517
> #52 0x00000000005b45f8 in HttpSM::state_api_callout (this=0x2aaadccc4bf0, 
> event=0, data=0x0) at HttpSM.cc:1455
> #53 0x00000000005ba712 in HttpSM::set_next_state (this=0x2aaadccc4bf0) at 
> HttpSM.cc:6876
> #54 0x000000000059fa6e in HttpSM::state_remap_request (this=0x2aaadccc4bf0, 
> event=63002) at HttpSM.cc:3880
> #55 0x00000000005b5b28 in HttpSM::main_handler (this=0x2aaadccc4bf0, 
> event=63002, data=0x0) at HttpSM.cc:2554
> #56 0x000000000061b15a in handleEvent (this=0x2aaadcfc8080, event=1, 
> e=0x2aaaf9350d80) at ../../../iocore/eventsystem/I_Continuation.h:145
> #57 RemapPlugins::run_remap (this=0x2aaadcfc8080, event=1, e=0x2aaaf9350d80) 
> at RemapPlugins.cc:179
> #58 0x0000000000765165 in handleEvent (this=0x2ba0ff262010, e=0x2aaaf9350d80, 
> calling_code=1) at I_Continuation.h:145
> #59 EThread::process_event (this=0x2ba0ff262010, e=0x2aaaf9350d80, 
> calling_code=1) at UnixEThread.cc:128
> #60 0x00000000007659fb in EThread::execute (this=0x2ba0ff262010) at 
> UnixEThread.cc:179
> #61 0x00000000007645aa in spawn_thread_internal (a=0x2919020) at Thread.cc:85
> #62 0x00000035966079d1 in start_thread () from /lib64/libpthread.so.0
> #63 0x0000003595ee88fd in clone () from /lib64/libc.so.6
> (gdb) f 0
> #0  0x00000000005bdb8b in HttpServerSession::do_io_write (this=<value 
> optimized out>, c=0x2aaadccc4bf0, nbytes=576, buf=0x2aaafc2ffee8, owner=false)
>     at HttpServerSession.cc:104
> 104     return server_vc->do_io_write(c, nbytes, buf, owner);
> (gdb) l
> 99    }
> 100   
> 101   VIO *
> 102   HttpServerSession::do_io_write(Continuation *c, int64_t nbytes, 
> IOBufferReader *buf, bool owner)
> 103   {
> 104     return server_vc->do_io_write(c, nbytes, buf, owner);
> 105   }
> 106   
> 107   void
> 108   HttpServerSession::do_io_shutdown(ShutdownHowTo_t howto)
> (gdb) p server_vc
> value has been optimized out
> (gdb) f 1
> #1  0x00000000005acc1d in HttpSM::setup_server_send_request 
> (this=0x2aaadccc4bf0) at HttpSM.cc:5686
> 5686    server_entry->write_vio = server_entry->vc->do_io_write(this, 
> hdr_length, buf_start);
> (gdb) l
> 5681                                                 
> MIME_PRESENCE_WWW_AUTHENTICATE)) {
> 5682      DebugSM("http_ss", "Setting server session to private for 
> authorization header");
> 5683      set_server_session_private(true);
> 5684    }
> 5685    milestones.server_begin_write = ink_get_hrtime();
> 5686    server_entry->write_vio = server_entry->vc->do_io_write(this, 
> hdr_length, buf_start);
> 5687  }
> 5688  
> 5689  void
> 5690  HttpSM::setup_server_read_response_header()
> (gdb) p server_entry
> $1 = (HttpVCTableEntry *) 0x0
> (gdb) 
> {code}



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