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

["Pasquale Puzio (JIRA)" <ji...@apache.org>]

Pasquale Puzio created TS-2825:
----------------------------------

             Summary: 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


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



--
This message was sent by Atlassian JIRA
(v6.2#6252)