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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Running -jump-threading twice crashes opt in ValueHandleBase::ValueIsDeleted"
href="https://llvm.org/bugs/show_bug.cgi?id=24517">24517</a>
</td>
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<tr>
<th>Summary</th>
<td>Running -jump-threading twice crashes opt in ValueHandleBase::ValueIsDeleted
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>opt
</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>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14751" name="attach_14751" title="Reproducer">attachment 14751</a> <a href="attachment.cgi?id=14751&action=edit" title="Reproducer">[details]</a></span>
Reproducer
Running
build-all/bin/opt -S ./bugpoint-reduced-simplified.ll -jump-threading
-jump-threading
on the attached bugpoint-reduced ll-file ends with
While deleting: label %bb1
An asserting value handle still pointed to this value!
UNREACHABLE executed at ../lib/IR/Value.cpp:686!
It's on the second invocation of jump-threading that it breaks, when it calls
llvm::removeUnreachableBlocks:
0 opt 0x0000000001635faa
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 42
1 opt 0x0000000001635606 llvm::sys::RunSignalHandlers() + 54
2 opt 0x00000000016378fa
3 libpthread.so.0 0x00007f8c62e30340
4 libc.so.6 0x00007f8c62058cc9 gsignal + 57
5 libc.so.6 0x00007f8c6205c0d8 abort + 328
6 opt 0x00000000015f68fd llvm::llvm_unreachable_internal(char
const*, char const*, unsigned int) + 461
7 opt 0x00000000012b8e2b
llvm::ValueHandleBase::ValueIsDeleted(llvm::Value*) + 1051
8 opt 0x00000000012b879b llvm::Value::~Value() + 43
9 opt 0x000000000117abb9 llvm::BasicBlock::~BasicBlock() + 9
10 opt 0x000000000167281c
llvm::removeUnreachableBlocks(llvm::Function&) + 2940
11 opt 0x00000000014c1667
12 opt 0x0000000001288744
llvm::FPPassManager::runOnFunction(llvm::Function&) + 516
13 opt 0x000000000128898b
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
14 opt 0x0000000001288e67
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 903
15 opt 0x0000000000605864 main + 8148
16 libc.so.6 0x00007f8c62043ec5 __libc_start_main + 245
17 opt 0x00000000005f6df2
The code looks like this when jump-threading is invoked the second time:
*** IR Dump Before Jump Threading ***
define void @fn1() {
.split.us:
br label %bb2.us.us
bb2.us.us: ; preds = %bb2.us.us,
%.split.us
br label %bb2.us.us
bb1.us: ; preds = %bb1.us
br label %bb1.us
bb2.us4: ; preds = %bb2.us4
br label %bb2.us4
bb2: ; preds = %bb1
%_tmp3 = icmp slt i16 %_tmp18, 2
br i1 %_tmp3, label %bb1, label %bb1
bb1: ; preds = %bb2, %bb2
%_tmp18 = load i16, i16* @c
%_tmp20 = icmp ne i16 %_tmp18, 0
br i1 %_tmp20, label %bb2, label %bb6
bb6: ; preds = %bb1
ret void
}
And when it tries to delete bb1 it crashes.</pre>
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