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https://issues.apache.org/jira/browse/TS-2584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13958159#comment-13958159
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ASF GitHub Bot commented on TS-2584:
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Github user jpeach commented on the pull request:
https://github.com/apache/trafficserver/pull/44#issuecomment-39381820
@SolidWallOfCode should review this.
> failed assert transforming and caching negative response
> --------------------------------------------------------
>
> Key: TS-2584
> URL: https://issues.apache.org/jira/browse/TS-2584
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Reporter: Jack Bates
> Labels: Review
> Fix For: 5.0.0
>
>
> If negative caching is enabled and you transform a negative response (for
> example a null transform) there is a failed assert in
> HttpTransact::set_headers_for_cache_write()
> {noformat}
> FATAL: HttpTransact.cc:4811: failed assert
> `cache_info->response_get()->valid()`
> proxy/.libs/lt-traffic_server - STACK TRACE:
> lib/ts/.libs/libtsutil.so.5(ink_fatal_die+0x0)[0xb77a6445]
> lib/ts/.libs/libtsutil.so.5(+0x22269)[0xb77a5269]
> proxy/.libs/lt-traffic_server(_ZN12HttpTransact27set_headers_for_cache_writeEPNS_5StateEP8HTTPInfoP7HTTPHdrS5_+0x1da)[0x81c0ae6]
> proxy/.libs/lt-traffic_server(_ZN12HttpTransact22handle_transform_readyEPNS_5StateE+0x272)[0x81c0576]
> proxy/.libs/lt-traffic_server(_ZN6HttpSM32call_transact_and_set_next_stateEPFvPN12HttpTransact5StateEE+0x78)[0x81a4b3e]
> proxy/.libs/lt-traffic_server(_ZN6HttpSM38state_response_wait_for_transform_readEiPv+0x196)[0x81926b0]
> proxy/.libs/lt-traffic_server(_ZN6HttpSM12main_handlerEiPv+0x2df)[0x81969b5]
> proxy/.libs/lt-traffic_server(_ZN12Continuation11handleEventEiPv+0x47)[0x811b427]
> proxy/.libs/lt-traffic_server(_ZN17TransformTerminus12handle_eventEiPv+0x27f)[0x815d81b]
> proxy/.libs/lt-traffic_server(_ZN12Continuation11handleEventEiPv+0x47)[0x811b427]
> proxy/.libs/lt-traffic_server(_ZN7EThread13process_eventEP5Eventi+0x104)[0x8300692]
> proxy/.libs/lt-traffic_server(_ZN7EThread7executeEv+0xd6)[0x8300916]
> proxy/.libs/lt-traffic_server[0x82ff569]
> /lib/i686/cmov/libpthread.so.0(+0x5955)[0xb7467955]
> /lib/i686/cmov/libc.so.6(clone+0x5e)[0xb717f1de]
> Aborted (core dumped)
> {noformat}
> HttpTransact::handle_transform_ready() passes s->cache_info.transform_store
> to HttpTransact::set_headers_for_cache_write()
> The ->valid() test at the top of HttpTransact::set_headers_for_cache_write()
> fails so ->create() gets called.
> {code}
> if (!cache_info->valid()) {
> cache_info->create();
> }
> {code}
> (s->cache_info.transform_store->m_alt is NULL. I didn't look into why this
> is, is it expected?)
> Because s->negative_caching is true, cache_info->response_set(response)
> doesn't get called, instead the assert fails.
> {code}
> if (!s->negative_caching)
> cache_info->response_set(response);
> else {
> ink_assert(cache_info->response_get()->valid());
> }
> {code}
> Assuming the cache_info->valid() test can fail and s->negative_caching can be
> true at the same time, one possible solution is to fix the logic so
> cache_info->response_set(response) gets called?
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