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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0799b3de3e3462224bddc0e4b6a3156d04a06361">0799b3de</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-09-18T15:55:50-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/nonmoving: Add missing STM write barrier
When updating a TRec for a TVar already part of a transaction we
previously neglected to add the old value to the update remembered set.
I suspect this was the cause of #18587.
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<h4>1 changed file:</h4>
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<a href="#e137645f8a9be9fa32cc764e19cea2b492e33d9c">
rts/STM.c
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<h4>Changes:</h4>
<li id="e137645f8a9be9fa32cc764e19cea2b492e33d9c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0799b3de3e3462224bddc0e4b6a3156d04a06361#e137645f8a9be9fa32cc764e19cea2b492e33d9c"><strong>rts/STM.c</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1342" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1342" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1342,6 +1342,9 @@ void stmWriteTVar(Capability *cap,</td>
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1342
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<pre style="margin: 0;"> <span id="LC1342" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">entry</span> <span class="o" style="font-weight: 600;">!=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num old_line" data-linenumber="1343" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="1343" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC1343" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">entry_in</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">trec</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC1344" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Entry found in our trec</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1345" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1345" class="line" lang="c"> <span class="n" style="color: #333;">IF_NONMOVING_WRITE_BARRIER_ENABLED</span> <span class="p">{</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1346" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1346" class="line" lang="c"> <span class="n" style="color: #333;">updateRemembSetPushClosure</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">entry</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">new_value</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1347" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1347" class="line" lang="c"> <span class="p">}</span></span>
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<td class="diff-line-num new_line" data-linenumber="1348" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC1348" class="line" lang="c"> <span class="n" style="color: #333;">entry</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">new_value</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_value</span><span class="p">;</span></span>
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<td class="diff-line-num new_line" data-linenumber="1349" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC1349" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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<td class="diff-line-num new_line" data-linenumber="1350" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC1350" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Entry found in another trec</span></span>
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