[jira] [Updated] (TS-2825) Segmentation fault on POST request transformation

["Leif Hedstrom (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-2825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leif Hedstrom updated TS-2825:
------------------------------
    Labels: crash  (was: )

> Segmentation fault on POST request transformation
> -------------------------------------------------
>
>                 Key: TS-2825
>                 URL: https://issues.apache.org/jira/browse/TS-2825
>             Project: Traffic Server
>          Issue Type: Bug
>          Components: Core, HTTP, Lua, Plugins, TS API
>            Reporter: Pasquale Puzio
>            Assignee: Kit Chan
>              Labels: crash
>             Fix For: sometime
>
>
> I'm trying to write a simple encryption/decryption plugin for Apache Traffic Server. The plugin should transform requests/responses in order to encrypt/decrypt them. I decided to write the plugin in LUA (using the ts-lua plugin available here https://github.com/portl4t/ts-lua)
>     function encrypt(data, eos)
>     if (data == '') then
>         return data, eos
>     end
>     if (eos == 1) then
>         ts.debug('End of Stream')
>     end
>     return data, eos
>     end
>     function do_remap()
>     ts.debug('do_remap')
>     if (ts.client_request.get_method() == 'POST') then
>         ts.hook(TS_LUA_REQUEST_TRANSFORM, encrypt)
>     end
>     ts.http.resp_cache_transformed(0)
>     ts.http.resp_cache_untransformed(0)
>     return 0
>     end
> Everything works fine for GET and DELETE requests, but when I send a POST chunked-encoded request, ATS crashes almost every time.
> if I don't activate the request transformation hook, the chunked request is forwarded perfectly. Most of the time, if one request is forwarded succesfully, the one after crashes.
> Here is the stack trace:
> [May 20 13:16:28.105] Server {0x7f045a1c1700} DEBUG: (http_redirect) [HttpSM::do_redirect]
> [May 20 13:16:28.105] Server {0x7f045a1c1700} DEBUG: (http_redirect) [HttpTunnel::deallocate_postdata_copy_buffers]
> NOTE: Traffic Server received Sig 11: Segmentation fault
> bin/traffic_server - STACK TRACE: 
> /lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0)[0x7f045cd29cb0]
> bin/traffic_server(_ZN6HttpSM17handle_api_returnEv+0x171)[0x5c274f]
> bin/traffic_server(_ZN6HttpSM17state_api_calloutEiPv+0x883)[0x5c24cf]
> bin/traffic_server(_ZN6HttpSM23do_api_callout_internalEv+0x1b7)[0x5ceaef]
> bin/traffic_server(_ZN6HttpSM14do_api_calloutEv+0x26)[0x5dc18e]
> bin/traffic_server(_ZN6HttpSM14set_next_stateEv+0x12f9)[0x5d6a19]
> bin/traffic_server(_ZN6HttpSM32call_transact_and_set_next_stateEPFvPN12HttpTransact5StateEE+0x1ba)[0x5d5718]
> bin/traffic_server(_ZN6HttpSM36state_common_wait_for_transform_readEP17HttpTransformInfoMS_FiiPvEiS2_+0x39b)[0x5c1a11]
> bin/traffic_server(_ZN6HttpSM37state_request_wait_for_transform_readEiPv+0x1e1)[0x5c1483]
> bin/traffic_server(_ZN6HttpSM12main_handlerEiPv+0x333)[0x5c5eeb]
> bin/traffic_server(_ZN12Continuation11handleEventEiPv+0x68)[0x4f06b2]
> bin/traffic_server(_ZN17TransformTerminus12handle_eventEiPv+0x2f6)[0x538d2a]
> bin/traffic_server(_ZN12Continuation11handleEventEiPv+0x68)[0x4f06b2]
> bin/traffic_server(_ZN7EThread13process_eventEP5Eventi+0x11e)[0x7537e2]
> bin/traffic_server(_ZN7EThread7executeEv+0xc9)[0x753a27]
> bin/traffic_server[0x752ca7]
> /lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a)[0x7f045cd21e9a]
> /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f045c0383fd]
> Segmentation fault (core dumped)
> I've already tried to use one of the example plugins for request transformation and I still have the same problem. The only way to make the problem disappear is to avoid request transformation.
> Is there something wrong in the way I'm transforming requests? What does this segmentation fault depend on?
> Thanks



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