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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash in LoadCombine/AliasSetTracker, take 2"
href="https://bugs.llvm.org/show_bug.cgi?id=33544">33544</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Crash in LoadCombine/AliasSetTracker, take 2
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18682" name="attach_18682" title="Reproducer">attachment 18682</a> <a href="attachment.cgi?id=18682&action=edit" title="Reproducer">[details]</a></span>
Reproducer
opt -S -disable-basicaa -load-combine -o - reduced2.ll
gives
opt: ../lib/Analysis/AliasSetTracker.cpp:144: void
llvm::AliasSet::addPointer(llvm::AliasSetTracker &, llvm::AliasSet::PointerRec
&, uint64_t, const llvm::AAMDNodes &, bool): Assertion `*PtrListEnd == nullptr
&& "End of list is not null?"' failed.
#0 0x0000000001d2ae64 PrintStackTraceSignalHandler(void*)
(build-all/bin/opt+0x1d2ae64)
#1 0x0000000001d2b5d6 SignalHandler(int) (build-all/bin/opt+0x1d2b5d6)
#2 0x00007f9f12641330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#3 0x00007f9f11230c37 gsignal
/build/eglibc-SvCtMH/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#4 0x00007f9f11234028 abort
/build/eglibc-SvCtMH/eglibc-2.19/stdlib/abort.c:91:0
#5 0x00007f9f11229bf6 __assert_fail_base
/build/eglibc-SvCtMH/eglibc-2.19/assert/assert.c:92:0
#6 0x00007f9f11229ca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#7 0x00000000012ba00b llvm::AliasSet::addPointer(llvm::AliasSetTracker&,
llvm::AliasSet::PointerRec&, unsigned long, llvm::AAMDNodes const&, bool)
(build-all/bin/opt+0x12ba00b)
#8 0x00000000012bafa5
llvm::AliasSetTracker::getAliasSetForPointer(llvm::Value*, unsigned long,
llvm::AAMDNodes const&) (build-all/bin/opt+0x12bafa5)
#9 0x00000000012bba61 llvm::AliasSetTracker::add(llvm::MemTransferInst*)
(build-all/bin/opt+0x12bba61)
#10 0x0000000001b795bd (anonymous
namespace)::LoadCombine::runOnBasicBlock(llvm::BasicBlock&)
(build-all/bin/opt+0x1b795bd)
#11 0x0000000001851c2a (anonymous
namespace)::BBPassManager::runOnFunction(llvm::Function&)
(build-all/bin/opt+0x1851c2a)
#12 0x000000000184c268 llvm::FPPassManager::runOnFunction(llvm::Function&)
(build-all/bin/opt+0x184c268)
#13 0x000000000184c4a8 llvm::FPPassManager::runOnModule(llvm::Module&)
(build-all/bin/opt+0x184c4a8)
#14 0x000000000184c985 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(build-all/bin/opt+0x184c985)
#15 0x00000000006da3a5 main (build-all/bin/opt+0x6da3a5)
#16 0x00007f9f1121bf45 __libc_start_main
/build/eglibc-SvCtMH/eglibc-2.19/csu/libc-start.c:321:0
#17 0x00000000006cba7b _start (build-all/bin/opt+0x6cba7b)
Stack dump:
0. Program arguments: build-all/bin/opt -S -disable-basicaa -load-combine
-o - reduced2.ll
1. Running pass 'Function Pass Manager' on module 'reduced2.ll'.
2. Running pass 'BasicBlock Pass Manager' on function '@test_spill_mixed'
3. Running pass 'Combine Adjacent Loads' on basic block '%0'
Abort
This looks very similar to <a href="https://bugs.llvm.org//show_bug.cgi?id=31493">https://bugs.llvm.org//show_bug.cgi?id=31493</a> which
stopped happening with r294632:
[LoadCombine] Fix combining of loads which span an aliasing store.
Fixes PR31517
Differential Revision: <a href="https://reviews.llvm.org/D28922">https://reviews.llvm.org/D28922</a>
Interestingly enough, if reverting r294632 the new crash goes away.
It also goes away if reverting r299876:
Add address space mangling to lifetime intrinsics
In preparation for allowing allocas to have non-0 addrspace.
git-svn-id: <a href="https://llvm.org/svn/llvm-project/llvm/trunk@299876">https://llvm.org/svn/llvm-project/llvm/trunk@299876</a>
91177308-0d34-0410-b5e6-96231b3b80d8</pre>
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