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<h3>
Ben Gamari pushed to branch wip/tsan/all
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/1050e8d8590d565ae63681e6e06641c2417f8772">1050e8d8</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-10-31T01:12:46-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Annotate hopefully "benign" race in freeGroup
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/098c1f934c079cba390f4e51d83b744eaec12666">098c1f93</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-10-31T01:13:13-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Strengthen ordering in releaseGCThreads
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<h4>2 changed files:</h4>
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<a href="#a9accda65187a56e0d42dd7fb7a717af6b41d918">
rts/sm/BlockAlloc.c
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<a href="#6477e10756faf038741e63d1ad499a1df809fe10">
rts/sm/GC.c
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<h4>Changes:</h4>
<li id="a9accda65187a56e0d42dd7fb7a717af6b41d918">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/b8be6fdee5377d4fcd7eacd935b2644461c6e2bb...098c1f934c079cba390f4e51d83b744eaec12666#a9accda65187a56e0d42dd7fb7a717af6b41d918"><strong>rts/sm/BlockAlloc.c</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -856,6 +856,12 @@ freeGroup(bdescr *p)</td>
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856
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856
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="c"> <span class="n" style="color: #333;">prev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-</span> <span class="mi" style="color: #099;">1</span><span class="p">;</span></span>
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857
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">prev</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">blocks</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="n" style="color: #333;">prev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prev</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">link</span><span class="p">;</span> <span class="c1" style="color: #998; font-style: italic;">// find the head</span></span>
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858
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="c"></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// This is a bit hairy... we are looking at bd->free of a block that we</span></span>
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860
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// do not own and yet have not synchronized with the thread that *does*</span></span>
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// own the block. We currently assume we won't see torn values and</span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// consequently this will work, although this is strictly speaking not</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// guaranteed under the memory model.</span></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="c"> <span class="n" style="color: #333;">TSAN_ANNOTATE_BENIGN_RACE</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">prev</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">free</span><span class="p">,</span> <span class="s" style="color: #d14;">"freeGroup"</span><span class="p">);</span></span>
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859
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">RELAXED_LOAD</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">prev</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">free</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="p">(</span><span class="n" style="color: #333;">P_</span><span class="p">)</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="c"> <span class="p">{</span></span>
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="c"> <span class="n" style="color: #333;">ln</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log_2</span><span class="p">(</span><span class="n" style="color: #333;">prev</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">blocks</span><span class="p">);</span></span>
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<li id="6477e10756faf038741e63d1ad499a1df809fe10">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/b8be6fdee5377d4fcd7eacd935b2644461c6e2bb...098c1f934c079cba390f4e51d83b744eaec12666#6477e10756faf038741e63d1ad499a1df809fe10"><strong>rts/sm/GC.c</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1416" 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="1416" 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">@@ -1416,10 +1416,10 @@ releaseGCThreads (Capability *cap USED_IF_THREADS, bool idle_cap[])</td>
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1416
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1416
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">i</span><span class="p">;</span></span>
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1417
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">=</span><span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">n_threads</span><span class="p">;</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="p">{</span></span>
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1418
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">me</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">idle_cap</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">])</span> <span class="k" style="font-weight: 600;">continue</span><span class="p">;</span></span>
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1419
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<pre style="margin: 0;">-<span id="LC1419" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">RELAXED</span>_LOAD</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gc_threads</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">wakeup</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">GC_THREAD_WAITING_TO_CONTINUE</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1419" 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">
1419
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<pre style="margin: 0;">+<span id="LC1419" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">SEQ_CST</span>_LOAD</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gc_threads</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">wakeup</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">GC_THREAD_WAITING_TO_CONTINUE</span><span class="p">)</span></span>
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1420
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1420
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<pre style="margin: 0;"> <span id="LC1420" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"releaseGCThreads"</span><span class="p">);</span></span>
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<td class="diff-line-num old_line" data-linenumber="1421" 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">
1421
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1421
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="c"></span>
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<td class="diff-line-num old old_line" data-linenumber="1422" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1422
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<pre style="margin: 0;">-<span id="LC1422" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left right">RELAXED</span>_STORE</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gc_threads</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">wakeup</span><span class="p">,</span> <span class="n" style="color: #333;">GC_THREAD_INACTIVE</span><span class="p">);</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1423" 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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1422
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<pre style="margin: 0;">+<span id="LC1422" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left right">SEQ_CST</span>_STORE</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gc_threads</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">wakeup</span><span class="p">,</span> <span class="n" style="color: #333;">GC_THREAD_INACTIVE</span><span class="p">);</span></span>
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1423
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1423
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="c"> <span class="n" style="color: #333;">ACQUIRE_SPIN_LOCK</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gc_threads</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">gc_spin</span><span class="p">);</span></span>
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1424
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1424
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<pre style="margin: 0;"> <span id="LC1424" class="line" lang="c"> <span class="n" style="color: #333;">RELEASE_SPIN_LOCK</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gc_threads</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">mut_spin</span><span class="p">);</span></span>
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1425
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1425
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<pre style="margin: 0;"> <span id="LC1425" class="line" lang="c"> <span class="p">}</span></span>
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