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<a href="https://gitlab.rtems.org/tracmigrate">Trac Migrate</a> created an issue: <a href="https://gitlab.rtems.org/rtems/pkg/rtems-net-legacy/-/issues/21">#21</a>
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Assignee: Trac Migrate
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Original author: johill</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">nios2-rtems4.11-gcc (GCC) 4.9.3 20150626 (RTEMS 4.11, RSB no-repo, Newlib 2.2.0.20150423)</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">configure --target=nios2-rtems4.11 --prefix=/ade/rtems/install/rtems-4-11 --disable-itron --disable-tests --enable-posix --enable-cxx --enable-rtemsbsp=altera-sys-config-S43X-TDAQ-dev --enable-networking</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">This is occurring in 4.11.1.99.</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">I don't suggest that this fix is a great design, but its what we are currently using here to get our regression tests to pass w/o causing a misaligned pointer exception. This change probably requires at least gcc 4.6 to properly align a char buffer on the stack this way.</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;"> git diff /ade/rtems/release/rtems-4-11/c/src/../../cpukit/libnetworking/libc/res_query.c</span>
<span id="LC2" class="line" lang="plaintext">diff --git a/cpukit/libnetworking/libc/res_query.c b/cpukit/libnetworking/libc/res_query.c</span>
<span id="LC3" class="line" lang="plaintext">index b742c30..e06f70f 100644</span>
<span id="LC4" class="line" lang="plaintext">--- a/cpukit/libnetworking/libc/res_query.c</span>
<span id="LC5" class="line" lang="plaintext">+++ b/cpukit/libnetworking/libc/res_query.c</span>
<span id="LC6" class="line" lang="plaintext">@@ -113,7 +113,7 @@ res_query(</span>
<span id="LC7" class="line" lang="plaintext"> u_char *answer, /* buffer to put answer */</span>
<span id="LC8" class="line" lang="plaintext"> int anslen) /* size of answer buffer */</span>
<span id="LC9" class="line" lang="plaintext"> {</span>
<span id="LC10" class="line" lang="plaintext">- u_char buf[MAXPACKET];</span>
<span id="LC11" class="line" lang="plaintext">+ u_char buf[MAXPACKET] __attribute ((aligned(4)));</span>
<span id="LC12" class="line" lang="plaintext"> HEADER *hp = (HEADER *) answer;</span>
<span id="LC13" class="line" lang="plaintext"> int n;</span></code></pre>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">#0 _Thread_Do_dispatch (cpu_self=<optimized out>, level=<optimized out>, level@entry=1) at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/score/src/threaddispatch.c:132</span>
<span id="LC2" class="line" lang="plaintext">#1 0x0807a6d4 in _Thread_Dispatch_enable (cpu_self=<optimized out>) at ../../cpukit/../../../altera-sys-config-llrf-fcm-diacrode/lib/include/rtems/score/threaddispatch.h:313</span>
<span id="LC3" class="line" lang="plaintext">#2 _Thread_Enable_dispatch_body () at ../../cpukit/../../../altera-sys-config-llrf-fcm-diacrode/lib/include/rtems/score/threaddispatch.h:343</span>
<span id="LC4" class="line" lang="plaintext">#3 _Thread_Enable_dispatch () at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/score/src/threadenabledispatch.c:30</span>
<span id="LC5" class="line" lang="plaintext">#4 0x08075f3c in _Objects_Put (the_object=<optimized out>) at ../../cpukit/../../../altera-sys-config-llrf-fcm-diacrode/lib/include/rtems/score/objectimpl.h:975</span>
<span id="LC6" class="line" lang="plaintext">#5 rtems_task_suspend (id=id@entry=0) at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/rtems/src/tasksuspend.c:37</span>
<span id="LC7" class="line" lang="plaintext">#6 0x0813d808 in _Nios2_CPU_exception_handler_last_resort (pefr=0x81d498c, ctx=<optimized out>) at /ade/rtems/release/rtems-4-11/c/src/lib/libcpu/nios2/shared/except/except-last-resort.c:64</span>
<span id="LC8" class="line" lang="plaintext">#7 0x0809d9ac in _Nios2_Exception_handler_high_level (pefr=0x81d498c) at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/score/cpu/nios2/nios2-except.c:119</span>
<span id="LC9" class="line" lang="plaintext">#8 0x0809d86c in _Nios2_Exception_handler () at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/score/cpu/nios2/nios2-except-low-level.S:96</span>
<span id="LC10" class="line" lang="plaintext">#9 0x08085980 in CPU_swap_u16 (value=10412) at ../../cpukit/../../../altera-sys-config-llrf-fcm-diacrode/lib/include/rtems/score/cpu.h:402</span>
<span id="LC11" class="line" lang="plaintext">#10 htons (_x=10412) at ../../cpukit/../../../altera-sys-config-llrf-fcm-diacrode/lib/include/rtems/endian.h:83</span>
<span id="LC12" class="line" lang="plaintext">#11 __res_mkquery (op=op@entry=0, dname=dname@entry=0x81d4aa8 "localhost.lcs.net", class=class@entry=1, type=type@entry=1, data=data@entry=0x0, datalen=datalen@entry=0, newrr_in=newrr_in@entry=0x0, buf=buf@entry-11/c/src/../../cpukit/libnetworking/libc/res_mkquery.c:122</span>
<span id="LC13" class="line" lang="plaintext">#12 0x08058bcc in __res_query (anslen=<optimized out>, answer=0x81d5318 "stupwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzpe=1, class=1, name=0x81d4aa8 "localhost.lcs.net") at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/libnetworking/libc/res_query.c:131</span>
<span id="LC14" class="line" lang="plaintext">#13 __res_querydomain (name=name@entry=0x81d576c "localhost", domain=<optimized out>, class=class@entry=1, type=type@entry=1, answer=answer@entry=0x81d5318 "stupwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghij"..., anslen=anslen@entry=1024) at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/libnetworking/libc/res_query.c:368</span>
<span id="LC15" class="line" lang="plaintext">#14 0x080590e0 in __res_search (name=0x81d576c "localhost", class=1, type=1, answer=0x81d5318 "stupwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdwxyzabcdefghij"..., anslen=1024) at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/libnetworking/libc/res_query.c:242</span>
<span id="LC16" class="line" lang="plaintext">#15 0x080808b8 in _gethostbydnsname (name=name@entry=0x81d576c "localhost", af=af@entry=2) at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/libnetworking/libc/gethostbydns.c:588</span>
<span id="LC17" class="line" lang="plaintext">#16 0x08056c58 in gethostbyname2 (type=2, name=0x81d576c "localhost") at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/libnetworking/libc/gethostnamadr.c:153</span>
<span id="LC18" class="line" lang="plaintext">#17 gethostbyname (name=name@entry=0x81d576c "localhost") at /ade/rtems/release/rtems-4-11/c/src/../../cpukit/libnetworking/libc/gethostnamadr.c:133</span>
<span id="LC19" class="line" lang="plaintext">#18 0x08045198 in hostToIPAddr (pHostName=pHostName@entry=0x81d576c "localhost", pIPA=pIPA@entry=0x81d5984) at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/osi/os/posix/osdSock.c:170</span>
<span id="LC20" class="line" lang="plaintext">#19 0x0803990c in aToIPAddr (pAddrString=pAddrString@entry=0x81d59b0 "localhost", defaultPort=defaultPort@entry=0, pIP=pIP@entry=0x81d5a30) at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/misc/aToIPAddr.c:168</span>
<span id="LC21" class="line" lang="plaintext">#20 0x0804ed80 in envGetInetAddrConfigParam (pParam=pParam@entry=0x81a723c <EPICS_IOC_LOG_INET>, pAddr=pAddr@entry=0x81d5a50) at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/env/envSubr.c:258</span>
<span id="LC22" class="line" lang="plaintext">#21 0x08036b2c in getConfig (pserver_port=<synthetic pointer>, pserver_addr=0x81d5a50) at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/log/iocLog.c:57</span>
<span id="LC23" class="line" lang="plaintext">#22 iocLogClientInit () at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/log/iocLog.c:88</span>
<span id="LC24" class="line" lang="plaintext">#23 iocLogInit () at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/log/iocLog.c:116</span>
<span id="LC25" class="line" lang="plaintext">#24 0x08008d60 in testLogPrefix () at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/test/epicsErrlogTest.c:402</span>
<span id="LC26" class="line" lang="plaintext">#25 epicsErrlogTest () at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/test/epicsErrlogTest.c:324</span>
<span id="LC27" class="line" lang="plaintext">#26 0x0803c51c in runTestFunc (name=name@entry=0x8189cf4 "epicsErrlogTest", func=0x80085e4 <epicsErrlogTest>) at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/misc/epicsUnitTest.c:262</span>
<span id="LC28" class="line" lang="plaintext">#27 0x08018b74 in epicsRunLibComTests () at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/test/epicsRunLibComTests.c:66</span>
<span id="LC29" class="line" lang="plaintext">#28 0x0802854c in main (argc=<optimized out>, argv=<optimized out>) at /ade/epics/supTop/base/DAR3.15.1.1/src/libCom/test/rtemsTestHarness.c:16</span>
<span id="LC30" class="line" lang="plaintext">(</span></code></pre>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">(gdb) print &buf</span>
<span id="LC2" class="line" lang="plaintext">$9 = (u_char (*)[1024]) 0x81d4ea9</span>
<span id="LC3" class="line" lang="plaintext">(gdb) list -</span>
<span id="LC4" class="line" lang="plaintext">116 u_char buf[MAXPACKET];</span>
<span id="LC5" class="line" lang="plaintext">117 HEADER *hp = (HEADER *) answer;</span>
<span id="LC6" class="line" lang="plaintext">118 int n;</span>
<span id="LC7" class="line" lang="plaintext">119</span>
<span id="LC8" class="line" lang="plaintext">120 hp->rcode = NOERROR; /* default */</span>
<span id="LC9" class="line" lang="plaintext">121</span>
<span id="LC10" class="line" lang="plaintext">122 if ((_res.options & RES_INIT) == 0 && res_init() == -1) {</span>
<span id="LC11" class="line" lang="plaintext">123 h_errno = NETDB_INTERNAL;</span>
<span id="LC12" class="line" lang="plaintext">124 return (-1);</span>
<span id="LC13" class="line" lang="plaintext">125 }</span></code></pre>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">(gdb) print &hp->id</span>
<span id="LC2" class="line" lang="plaintext">$3 = (unsigned int *) 0x81d4ea9</span>
<span id="LC3" class="line" lang="plaintext">(gdb) print &hp</span>
<span id="LC4" class="line" lang="plaintext">$4 = (HEADER **) 0x81d4aa0</span>
<span id="LC5" class="line" lang="plaintext">(gdb) print *hp</span>
<span id="LC6" class="line" lang="plaintext">$5 = {id = 0, rd = 0, tc = 0, aa = 0, opcode = 0, qr = 0, rcode = 0, cd = 0, ad = 0, unused = 0, ra = 0, qdcount = 0, ancount = 0, nscount = 0, arcount = 0}</span>
<span id="LC7" class="line" lang="plaintext">(gdb) print &hp->id</span>
<span id="LC8" class="line" lang="plaintext">$6 = (unsigned int *) 0x81d4ea9</span>
<span id="LC9" class="line" lang="plaintext">(gdb) print hp</span>
<span id="LC10" class="line" lang="plaintext">$7 = (HEADER *) 0x81d4ea9</span>
<span id="LC11" class="line" lang="plaintext">(gdb) list</span>
<span id="LC12" class="line" lang="plaintext">117 */</span>
<span id="LC13" class="line" lang="plaintext">118 if ((buf == NULL) || (buflen < HFIXEDSZ))</span>
<span id="LC14" class="line" lang="plaintext">119 return (-1);</span>
<span id="LC15" class="line" lang="plaintext">120 memset(buf, 0, HFIXEDSZ);</span>
<span id="LC16" class="line" lang="plaintext">121 hp = (HEADER *) buf;</span>
<span id="LC17" class="line" lang="plaintext">122 hp->id = htons(++_res.id);</span>
<span id="LC18" class="line" lang="plaintext">123 hp->opcode = op;</span>
<span id="LC19" class="line" lang="plaintext">124 hp->rd = (_res.options & RES_RECURSE) != 0;</span>
<span id="LC20" class="line" lang="plaintext">125 hp->rcode = NOERROR;</span></code></pre>
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