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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/e3a7e8bd76a817d0a5cab10f5b098153624b7585">e3a7e8bd</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-10-31T11:42:53-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More races in freeGroup
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<h4>1 changed file:</h4>
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<a href="#a9accda65187a56e0d42dd7fb7a717af6b41d918">
rts/sm/BlockAlloc.c
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<h4>Changes:</h4>
<li id="a9accda65187a56e0d42dd7fb7a717af6b41d918">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3a7e8bd76a817d0a5cab10f5b098153624b7585#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">@@ -787,6 +787,26 @@ free_mega_group (bdescr *mg)</td>
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Note [Data races in freeGroup]</span></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * freeGroup commits a rather serious concurrency sin in its block coalescence</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * logic: When freeing a block it looks at bd->free of the previous/next block</span></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * to see whether it is allocated. However, the free'ing thread likely does not</span></span>
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * own the previous/next block, nor do we make any attempt to synchronize with</span></span>
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * the thread that *does* own it; this makes this access a data race.</span></span>
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * The original design argued that this was correct because `bd->free` will</span></span>
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * only take a value of -1 when the block is free and thereby owned by the</span></span>
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * storage manager. However, this is nevertheless unsafe under the C11 data</span></span>
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * model, which guarantees no particular semantics for data races.</span></span>
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * We currently assume (and hope) we won't see torn values and consequently</span></span>
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * we will never see `bd->free == -1` for an allocated block which we do not</span></span>
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * own. However, this is all extremely dodgy.</span></span>
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This is tracked as #18913.</span></span>
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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809
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="c"></span>
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790
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810
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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811
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<pre style="margin: 0;"> <span id="LC811" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">freeGroup</span><span class="p">(</span><span class="n" style="color: #333;">bdescr</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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812
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="c"><span class="p">{</span></span>
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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">@@ -834,6 +854,9 @@ freeGroup(bdescr *p)</td>
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834
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854
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="c"> <span class="p">{</span></span>
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835
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855
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="c"> <span class="n" style="color: #333;">bdescr</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">next</span><span class="p">;</span></span>
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836
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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;">next</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="n" style="color: #333;">p</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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857
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="c"></span>
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858
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// See Note [Data races in freeGroup].</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" 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;">next</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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837
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">next</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">LAST_BDESCR</span><span class="p">(</span><span class="n" style="color: #333;">MBLOCK_ROUND_DOWN</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">))</span></span>
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="c"> <span class="o" style="font-weight: 600;">&&</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;">next</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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839
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862
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="c"> <span class="p">{</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="879" 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">@@ -856,11 +879,7 @@ freeGroup(bdescr *p)</td>
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856
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879
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<pre style="margin: 0;"> <span id="LC879" 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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880
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<pre style="margin: 0;"> <span id="LC880" 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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881
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<pre style="margin: 0;"> <span id="LC881" 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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861
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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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862
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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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882
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// See Note [Data races in freeGroup].</span></span>
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883
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<pre style="margin: 0;"> <span id="LC883" 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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884
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<pre style="margin: 0;"> <span id="LC884" 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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885
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<pre style="margin: 0;"> <span id="LC885" class="line" lang="c"> <span class="p">{</span></span>
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