[
https://issues.apache.org/jira/browse/TS-3520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sudheer Vinukonda resolved TS-3520.
-----------------------------------
Resolution: Fixed
> Core dump in logging unmapped url path, when the request url maps to
> catch-all (default) remap rule
> ---------------------------------------------------------------------------------------------------
>
> Key: TS-3520
> URL: https://issues.apache.org/jira/browse/TS-3520
> Project: Traffic Server
> Issue Type: Bug
> Components: Logging
> Affects Versions: 5.3.0
> Reporter: Sudheer Vinukonda
> Assignee: Sudheer Vinukonda
> Fix For: 6.0.0
>
>
> When the incoming requests map to the default remap rule like below, the
> unmapped url path, hostname etc are not initialized correctly in the Logging
> module and result in crashes, if custom logging is enabled on those fields.
> *map / http://abc.com*
> {code}
> (gdb) bt
> #0 0x0000003b72a8992b in memcpy () from /lib64/libc.so.6
> #1 0x0000000000648c7e in LogAccess::marshal_mem (dest=0x2b94041d6e60 "/",
> source=0x2b93e8046869 "/", actual_len=-2, padded_len=0) at LogAccess.cc:829
> #2 0x000000000064b4a3 in LogAccessHttp::marshal_client_req_unmapped_url_path
> (this=0x2b92b8806750, buf=0x2b94041d6e60 "/") at LogAccessHttp.cc:452
> #3 0x0000000000658e4b in LogField::marshal (this=0x2cf3660,
> lad=0x2b92b8806750, buf=0x2b94041d6e60 "/") at LogField.cc:302
> #4 0x000000000065991d in LogFieldList::marshal (this=0x2cf2690,
> lad=0x2b92b8806750, buf=0x2b94041d6e00 "2nsfor5aiq80k") at LogField.cc:602
> #5 0x0000000000667510 in LogObject::log (this=0x2cf25c0, lad=0x2b92b8806750,
> text_entry=0x0) at LogObject.cc:640
> #6 0x0000000000669ad8 in LogObjectManager::log (this=0x2cdd2f8,
> lad=0x2b92b8806750) at LogObject.cc:1354
> #7 0x0000000000645836 in Log::access (lad=0x2b92b8806750) at Log.cc:1145
> #8 0x00000000005df896 in HttpSM::update_stats (this=0x2b93b4daad90) at
> HttpSM.cc:6643
> #9 0x00000000005df549 in HttpSM::kill_this (this=0x2b93b4daad90) at
> HttpSM.cc:6604
> #10 0x00000000005d1e95 in HttpSM::main_handler (this=0x2b93b4daad90,
> event=2301, data=0x2b93b4dab9b8) at HttpSM.cc:2540
> #11 0x00000000004f6c68 in Continuation::handleEvent (this=0x2b93b4daad90,
> event=2301, data=0x2b93b4dab9b8) at ../iocore/eventsystem/I_Continuation.h:146
> #12 0x000000000061ac93 in HttpTunnel::main_handler (this=0x2b93b4dab9b8,
> event=103, data=0x2b93d42db4a8) at HttpTunnel.cc:1537
> #13 0x00000000004f6c68 in Continuation::handleEvent (this=0x2b93b4dab9b8,
> event=103, data=0x2b93d42db4a8) at ../iocore/eventsystem/I_Continuation.h:146
> #14 0x00000000007388f0 in write_signal_and_update (event=103,
> vc=0x2b93d42db330) at UnixNetVConnection.cc:171
> #15 0x00000000007389ee in write_signal_done (event=103, nh=0x2b92b23b0cb0,
> vc=0x2b93d42db330) at UnixNetVConnection.cc:198
> #16 0x0000000000739901 in write_to_net_io (nh=0x2b92b23b0cb0,
> vc=0x2b93d42db330, thread=0x2b92b23ad010) at UnixNetVConnection.cc:508
> #17 0x00000000007391c7 in write_to_net (nh=0x2b92b23b0cb0, vc=0x2b93d42db330,
> thread=0x2b92b23ad010) at UnixNetVConnection.cc:370
> #18 0x00000000007324de in NetHandler::mainNetEvent (this=0x2b92b23b0cb0,
> event=5, e=0x29d7db0) at UnixNet.cc:531
> #19 0x00000000004f6c68 in Continuation::handleEvent (this=0x2b92b23b0cb0,
> event=5, data=0x29d7db0) at ../iocore/eventsystem/I_Continuation.h:146
> #20 0x0000000000759412 in EThread::process_event (this=0x2b92b23ad010,
> e=0x29d7db0, calling_code=5) at UnixEThread.cc:145
> #21 0x000000000075991c in EThread::execute (this=0x2b92b23ad010) at
> UnixEThread.cc:269
> #22 0x0000000000758990 in spawn_thread_internal (a=0x28a6de0) at Thread.cc:88
> #23 0x00002b92b0e499d1 in start_thread () from /lib64/libpthread.so.0
> #24 0x0000003b72ae88fd in clone () from /lib64/libc.so.6
> (gdb) up
> #1 0x0000000000648c7e in LogAccess::marshal_mem (dest=0x2b94041d6e60 "/",
> source=0x2b93e8046869 "/", actual_len=-2, padded_len=0) at LogAccess.cc:829
> 829 LogAccess.cc: No such file or directory.
> (gdb) up
> #2 0x000000000064b4a3 in LogAccessHttp::marshal_client_req_unmapped_url_path
> (this=0x2b92b8806750, buf=0x2b94041d6e60 "/") at LogAccessHttp.cc:452
> 452 LogAccessHttp.cc: No such file or directory.
> {code}
> Some gdb info:
> {code}
> (gdb) p m_client_req_unmapped_url_path_len
> $1 = -2
> (gdb) p m_client_req_unmapped_url_path_str
> $2 = 0x2b93e8046869 "/"
> (gdb) p *m_client_req_unmapped_url_path_str
> $3 = 47 '/'
> (gdb) p m_client_req_unmapped_url_host_len
> $4 = 34
> (gdb) p buf
> $5 = 0x2b94041d6e60 "/"
> (gdb) p m_client_req_unmapped_url_host_str
> $6 = 0x2b93e8046847 "%5B14:11:32%20UTC%202015%20--%3E"
> (gdb) p m_client_request
> $7 = (HTTPHdr *) 0x2b93b4dab098
> (gdb) p *m_client_request
> $8 = {<MIMEHdr> = {<HdrHeapSDKHandle> = {m_heap = 0x2b93e00a1c20}, m_mime =
> 0x2b93e00a1cd8}, m_http = 0x2b93e00a1ca8, m_url_cached = {<HdrHeapSDKHandle>
> = {m_heap = 0x2b93e00a1c20},
> m_url_impl = 0x2b93e00a1f28}, m_host_mime = 0x0, m_host_length = 28,
> m_port = 80, m_target_cached = true, m_target_in_url = true, m_port_in_header
> = false, static USE_HDR_HEAP_MAGIC = 0x1}
> (gdb) p m_client_request.m_url_impl
> There is no member or method named m_url_impl.
> (gdb) p m_client_request.m_url_cached.m_url_impl
> $9 = (URLImpl *) 0x2b93e00a1f28
> (gdb) p *m_client_request.m_url_cached.m_url_impl
> $10 = {<HdrHeapObjImpl> = {m_type = 2, m_length = 112, m_obj_flags = 0},
> m_len_scheme = 4, m_len_user = 0, m_len_password = 0, m_len_host = 28,
> m_len_port = 0, m_len_path = 0, m_len_params = 0,
> m_len_query = 0, m_len_fragment = 0, m_len_printed_string = 36,
> m_ptr_scheme = 0x2b94841cf74a "httpY-RID2nsfor5aiq80khttp://abc.com/";,
> m_ptr_user = 0x0, m_ptr_password = 0x0,
> m_ptr_host = 0x2b94841cf72e "abc.comhttpXXXXXXXXXXXXXkhttp://abc.com/";,
> m_ptr_port = 0x0, m_ptr_path = 0x0, m_ptr_params = 0x0, m_ptr_query = 0x0,
> m_ptr_fragment = 0x0, m_ptr_printed_string = 0x2b94841cf760
> "http://abc.com/";, m_scheme_wks_idx = 97, m_port = 0, m_url_type = 1 '\001',
> m_type_code = 0 '\000', m_clean = 1}
> (gdb) p m_client_request.m_http
> $11 = (HTTPHdrImpl *) 0x2b93e00a1ca8
> (gdb) p *m_client_request.m_http
> $12 = {<HdrHeapObjImpl> = {m_type = 3, m_length = 48, m_obj_flags = 0},
> m_polarity = HTTP_TYPE_REQUEST, m_version = 9, u = {req = {m_url_impl =
> 0x2b93e00a1f28,
> m_ptr_method = 0x2b93f822e7ec "14 14:11:32 UTC 2015 -->\n",
> m_len_method = 2, m_method_wks_idx = -1}, resp = {m_ptr_reason =
> 0x2b93e00a1f28 "\002p", m_len_reason = 59372, m_status = -2014}},
> m_fields_impl = 0x2b93e00a1cd8}
> (gdb) p *m_client_request.m_http.u.req.m_ptr_method
> $13 = 49 '1'
> (gdb) p m_client_request.m_http.u.req.m_ptr_method
> $14 = 0x2b93f822e7ec "14 14:11:32 UTC 2015 -->\n"
> (gdb) p m_client_req_url_str
> $15 = 0x2b93e8046819 "http://abc.com/";
> (gdb) p m_client_req_url_canon_str
> $16 = 0x2b93e8046819 "http://abc.com/";
> (gdb) p m_client_req_url_len
> $17 = 36
> (gdb) p m_client_req_unmapped_url_canon_str
> $18 = 0x2b93e8046840 "http://%5B14:11:32%20UTC%202015%20--%3E";
> (gdb) p m_client_req_unmapped_url_host_str
> $19 = 0x2b93e8046847 "%5B14:11:32%20UTC%202015%20--%3E"
> (gdb) p m_client_req_url_path_str
> $20 = 0x0
> (gdb) p m_client_req_url_path_len
> $21 = 0
> {code}
> Below patch should address this:
> {code}
> diff --git a/proxy/logging/LogAccessHttp.cc b/proxy/logging/LogAccessHttp.cc
> index 573c1f4..e0edffd 100644
> --- a/proxy/logging/LogAccessHttp.cc
> +++ b/proxy/logging/LogAccessHttp.cc
> @@ -419,7 +419,7 @@ LogAccessHttp::marshal_client_req_unmapped_url_canon(char
> *buf)
> int len = INK_MIN_ALIGN;
>
> validate_unmapped_url();
> - if (0 == m_client_req_unmapped_url_canon_len) {
> + if (0 >= m_client_req_unmapped_url_canon_len) {
> // If the unmapped URL isn't populated, we'll fall back to the original
> // client URL. This helps for example server intercepts to continue to
> // log the requests, even when there is no remap rule for it.
> @@ -445,7 +445,7 @@ LogAccessHttp::marshal_client_req_unmapped_url_path(char
> *buf)
> validate_unmapped_url();
> validate_unmapped_url_path();
>
> - if (0 == m_client_req_unmapped_url_path_len) {
> + if (0 >= m_client_req_unmapped_url_path_len) {
> len = marshal_client_req_url_path(buf);
> } else {
> len = round_strlen(m_client_req_unmapped_url_path_len + 1); // +1 for eos
> {code}
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