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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:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ea37b01b6ab16937f7b528b6bbae9fade9f1361">8ea37b01</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-22T23:17:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RTS: workaround a Linux kernel bug in timerfd
Reading a timerfd may return 0: https://lkml.org/lkml/2019/8/16/335.
This is currently undocumented behavior and documentation "won't happen
anytime soon" (https://lkml.org/lkml/2020/2/13/295).
With this patch, we just ignore the result instead of crashing. It may
fix #18033 but we can't be sure because we don't have enough
information.
See also this discussion about the kernel bug:
https://github.com/Azure/sonic-swss-common/pull/302/files/1f070e7920c2e5d63316c0105bf4481e73d72dc9
</pre>
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<h4>1 changed file:</h4>
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<a href="#ec675bd1dfbb74e562acdc649628789841b48f75">
rts/posix/itimer/Pthread.c
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<h4>Changes:</h4>
<li id="ec675bd1dfbb74e562acdc649628789841b48f75">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ea37b01b6ab16937f7b528b6bbae9fade9f1361#ec675bd1dfbb74e562acdc649628789841b48f75"><strong>rts/posix/itimer/Pthread.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">@@ -122,10 +122,18 @@ static void *itimer_thread_func(void *_handle_tick)</td>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">exited</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">USE_TIMERFD_FOR_ITIMER</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">read</span><span class="p">(</span><span class="n" style="color: #333;">timerfd</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">nticks</span><span class="p">,</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">nticks</span><span class="p">))</span> <span class="o" style="font-weight: 600;">!=</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">nticks</span><span class="p">))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC126" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">errno</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">EINTR</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"Itimer: read(timerfd) failed: %s"</span><span class="p">,</span> <span class="n" style="color: #333;">strerror</span><span class="p">(</span><span class="n" style="color: #333;">errno</span><span class="p">));</span></span>
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<pre style="margin: 0;">-<span id="LC128" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">ssize_t</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">read</span><span class="p">(</span><span class="n" style="color: #333;">timerfd</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">nticks</span><span class="p">,</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">nticks</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">((</span><span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">errno</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* r == 0 is expected only for non-blocking fd (in which case</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * errno should be EAGAIN) but we use a blocking fd.</span></span>
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<pre style="margin: 0;">+<span id="LC129" 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="LC130" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Due to a kernel bug (cf https://lkml.org/lkml/2019/8/16/335)</span></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * on some platforms we could see r == 0 and errno == 0.</span></span>
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<pre style="margin: 0;">+<span id="LC132" 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="LC133" class="line" lang="c"> <span class="n" style="color: #333;">IF_DEBUG</span><span class="p">(</span><span class="n" style="color: #333;">scheduler</span><span class="p">,</span> <span class="n" style="color: #333;">debugBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"read(timerfd) returned 0 with errno=0. This is a known kernel bug. We just ignore it."</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">!=</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">nticks</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">errno</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">EINTR</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"Itimer: read(timerfd) failed with %s and returned %zd"</span><span class="p">,</span> <span class="n" style="color: #333;">strerror</span><span class="p">(</span><span class="n" style="color: #333;">errno</span><span class="p">),</span> <span class="n" style="color: #333;">r</span><span class="p">);</span></span>
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137
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="c"> <span class="p">}</span></span>
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138
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<pre style="margin: 0;"> <span id="LC138" 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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131
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">rtsSleep</span><span class="p">(</span><span class="n" style="color: #333;">itimer_interval</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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