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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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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74c797f6b72c4d01f5e0092dfac1461f3f3dd7a2">74c797f6</a></strong>
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<span>by Benjamin Maurer</span>
<i>at 2020-09-29T00:33:20-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Workaround for #18623: GHC crashes bc. under rlimit for vmem it will reserve
_all_ of it, leaving nothing for, e.g., thread stacks.
Fix will only allocate 2/3rds and check whether remainder is at least large
enough for minimum amount of thread stacks.
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<h4>2 changed files:</h4>
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<a href="#34aaedc89b793629cde66c63c1842ee679f621af">
rts/posix/OSMem.c
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+
testsuite/tests/rts/T18623/all.T
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<h4>Changes:</h4>
<li id="34aaedc89b793629cde66c63c1842ee679f621af">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74c797f6b72c4d01f5e0092dfac1461f3f3dd7a2#34aaedc89b793629cde66c63c1842ee679f621af"><strong>rts/posix/OSMem.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">@@ -39,6 +39,7 @@</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(HAVE_SYS_RESOURCE_H) && defined(HAVE_SYS_TIME_H)</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <sys/time.h></span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <sys/resource.h></span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <pthread.h></span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <errno.h></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">@@ -545,13 +546,57 @@ void *osReserveHeapMemory(void *startAddressPtr, W_ *len)</td>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="c"></span>
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548
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(HAVE_SYS_RESOURCE_H) && defined(HAVE_SYS_TIME_H)</span></span>
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<pre style="margin: 0;">-<span id="LC548" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">rlimit</span> <span class="n" style="color: #333;"><span class="idiff left right">l</span>imit</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">rlimit</span> <span class="n" style="color: #333;"><span class="idiff left right">asL</span>imit</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* rlim_t is signed on some platforms, including FreeBSD;</span></span>
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551
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * explicitly cast to avoid sign compare error */</span></span>
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<pre style="margin: 0;">-<span id="LC551" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">getrlimit</span><span class="p">(</span><span class="n" style="color: #333;">RLIMIT_AS</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">limit</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC552" class="line" lang="c"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">limit</span><span class="p">.</span><span class="n" style="color: #333;">rlim_cur</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">-<span id="LC553" class="line" lang="c"> <span class="o" style="font-weight: 600;">&&</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">></span> <span class="p">(</span><span class="n" style="color: #333;">W_</span><span class="p">)</span> <span class="n" style="color: #333;">limit</span><span class="p">.</span><span class="n" style="color: #333;">rlim_cur</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC554" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">W_</span><span class="p">)</span> <span class="n" style="color: #333;">limit</span><span class="p">.</span><span class="n" style="color: #333;">rlim_cur</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC552" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">getrlimit</span><span class="p">(</span><span class="n" style="color: #333;">RLIMIT_AS</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">asLimit</span><span class="p">)</span></span>
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553
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="c"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">asLimit</span><span class="p">.</span><span class="n" style="color: #333;">rlim_cur</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span></span>
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554
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="c"> <span class="o" style="font-weight: 600;">&&</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">></span> <span class="p">(</span><span class="n" style="color: #333;">W_</span><span class="p">)</span> <span class="n" style="color: #333;">asLimit</span><span class="p">.</span><span class="n" style="color: #333;">rlim_cur</span><span class="p">)</span> <span class="p">{</span></span>
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555
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<pre style="margin: 0;">+<span id="LC555" class="line" lang="c"></span>
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556
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* In case address space/virtual memory was limited by rlimit (ulimit),</span></span>
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557
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> we try to reserver 2/3 of that limit. If we take all, there'll be</span></span>
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558
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> nothing left for spawning system threads etc. and we'll crash</span></span>
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559
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> (See #18623)</span></span>
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560
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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561
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="c"></span>
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562
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="c"> <span class="n" style="color: #333;">pthread_attr_t</span> <span class="n" style="color: #333;">threadAttr</span><span class="p">;</span></span>
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563
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">pthread_attr_init</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">threadAttr</span><span class="p">))</span> <span class="p">{</span></span>
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564
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Never fails on Linux</span></span>
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565
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="c"> <span class="n" style="color: #333;">sysErrorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"failed to initialize thread attributes"</span><span class="p">);</span></span>
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566
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="c"> <span class="n" style="color: #333;">stg_exit</span><span class="p">(</span><span class="n" style="color: #333;">EXIT_FAILURE</span><span class="p">);</span></span>
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567
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="c"> <span class="p">}</span></span>
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568
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="c"></span>
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569
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">stacksz</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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570
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">pthread_attr_getstacksize</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">threadAttr</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stacksz</span><span class="p">))</span> <span class="p">{</span></span>
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571
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Should never fail</span></span>
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572
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<pre style="margin: 0;">+<span id="LC572" class="line" lang="c"> <span class="n" style="color: #333;">sysErrorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"failed to read default thread stack size"</span><span class="p">);</span></span>
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573
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="c"> <span class="n" style="color: #333;">stg_exit</span><span class="p">(</span><span class="n" style="color: #333;">EXIT_FAILURE</span><span class="p">);</span></span>
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574
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<pre style="margin: 0;">+<span id="LC574" class="line" lang="c"> <span class="p">}</span></span>
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575
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="c"></span>
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576
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Cleanup</span></span>
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577
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">pthread_attr_destroy</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">threadAttr</span><span class="p">))</span> <span class="p">{</span></span>
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578
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Should never fail</span></span>
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579
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="c"> <span class="n" style="color: #333;">sysErrorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"failed to destroy thread attributes"</span><span class="p">);</span></span>
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580
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="c"> <span class="n" style="color: #333;">stg_exit</span><span class="p">(</span><span class="n" style="color: #333;">EXIT_FAILURE</span><span class="p">);</span></span>
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581
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="c"> <span class="p">}</span></span>
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582
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="c"></span>
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583
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">pageSize</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getPageSize</span><span class="p">();</span></span>
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584
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// 2/3rds of limit, round down to multiple of PAGE_SIZE</span></span>
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585
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">W_</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">asLimit</span><span class="p">.</span><span class="n" style="color: #333;">rlim_cur</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">0</span><span class="p">.</span><span class="mi" style="color: #099;">666</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&</span> <span class="o" style="font-weight: 600;">~</span><span class="p">(</span><span class="n" style="color: #333;">pageSize</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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586
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="c"></span>
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587
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// debugBelch("New len: %zu, pageSize: %zu\n", *len, pageSize);</span></span>
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588
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="c"></span>
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589
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Make sure we leave enough vmem for at least three threads.</span></span>
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590
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> This number was found through trial and error. We're at least launching</span></span>
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591
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> that many threads (e.g., itimer). We can't know for sure how much we need,</span></span>
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592
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> but at least we can fail early and give a useful error message in this case. */</span></span>
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593
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(((</span><span class="n" style="color: #333;">W_</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">asLimit</span><span class="p">.</span><span class="n" style="color: #333;">rlim_cur</span> <span class="o" style="font-weight: 600;">-</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">len</span> <span class="p">))</span> <span class="o" style="font-weight: 600;"><</span> <span class="p">((</span><span class="n" style="color: #333;">W_</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">stacksz</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">3</span><span class="p">)))</span> <span class="p">{</span></span>
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594
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Three stacks is 1/3 of needed, then convert to Megabyte</span></span>
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595
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">needed</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">stacksz</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">3</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">3</span><span class="p">)</span> <span class="o" style="font-weight: 600;">/</span> <span class="p">(</span><span class="mi" style="color: #099;">1024</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span><span class="p">);</span></span>
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596
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="c"> <span class="n" style="color: #333;">errorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"the current resource limit for virtual memory ('ulimit -v' or RLIMIT_AS) is too low.</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="c"> <span class="s" style="color: #d14;">"Please make sure that at least %zuMiB of virtual memory are available."</span><span class="p">,</span> <span class="n" style="color: #333;">needed</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="c"> <span class="n" style="color: #333;">stg_exit</span><span class="p">(</span><span class="n" style="color: #333;">EXIT_FAILURE</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="c"></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">@@ -577,9 +622,11 @@ void *osReserveHeapMemory(void *startAddressPtr, W_ *len)</td>
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<pre style="margin: 0;"> <span id="LC622" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// of memory will be wasted (e.g. imagine a machine with 512GB of</span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// physical memory but a 511GB ulimit). See #14492.</span></span>
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<pre style="margin: 0;"> <span id="LC624" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">-=</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">/</span> <span class="mi" style="color: #099;">8</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// debugBelch("Limit hit, reduced len: %zu\n", *len);</span></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="c"> <span class="p">}</span> <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;">W_</span><span class="p">)</span><span class="n" style="color: #333;">at</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">minimumAddress</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Success! We were given a block of memory starting above the 8 GB</span></span>
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// mark, which is what we were looking for.</span></span>
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="c"> <span class="k" style="font-weight: 600;">break</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC631" 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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<pre style="margin: 0;"> <span id="LC632" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// We got addressing space but it wasn't above the 8GB mark.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74c797f6b72c4d01f5e0092dfac1461f3f3dd7a2#2060e4a04df848b7e17efef4baf098eb38d945f1"><strong>testsuite/tests/rts/T18623/all.T</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Starting GHC on *nix with vmem limit, RTS will reserve all available memory</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># and crash when creating a thread. Fix reserves only 2/3rds of vmem_limit.</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18623</span><span class="p">',</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="perl"> <span class="p">[</span><span class="nv" style="color: #008080;">when</span><span class="p">(</span><span class="nv" style="color: #008080;">opsys</span><span class="p">('</span><span class="s1" style="color: #d14;">mingw32</span><span class="p">'),</span> <span class="nv" style="color: #008080;">skip</span><span class="p">),</span> <span class="nv" style="color: #008080;">cmd_prefix</span><span class="p">('</span><span class="s1" style="color: #d14;">ulimit -v </span><span class="p">'</span> <span class="o" style="font-weight: 600;">+</span> <span class="nv" style="color: #008080;">str</span><span class="p">(</span><span class="mi" style="color: #099;">1024</span> <span class="o" style="font-weight: 600;">**</span> <span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">+</span> <span class="p">'</span><span class="s1" style="color: #d14;"> && </span><span class="p">'),</span> <span class="nv" style="color: #008080;">ignore_stdout</span><span class="p">],</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="perl"> <span class="nv" style="color: #008080;">run_command</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">{compiler} --version</span><span class="p">'])</span></span></pre>
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