<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/119598>119598</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
[LLDB][Minidump] Backtrace broken on minidumps when binary also loaded
</td>
</tr>
<tr>
<th>Labels</th>
<td>
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
strangewiz
</td>
</tr>
</table>
<pre>
After e9c8f75d45 `[LLDB][Minidump] Have Minidumps save off and properly read TLS data (#109477)`, minidumps loaded with the binary adjacent cannot show a correct backtrace beyond the first frame.
e.g. we see:
(lldb) bt
* thread #1
* frame #0: 0x000000018d8813c8
frame #1: 0x000000018d760714
instead of:
(lldb) bt
* thread #1
* frame #0: 0x000000018d8813c8 libsystem_kernel.dylib`__semwait_signal + 8
frame #1: 0x000000018d760714 libsystem_c.dylib`nanosleep + 220
frame #2: 0x000000018d7696f8 libsystem_c.dylib`sleep + 52
frame #3: 0x0000000100373f40 simple`func4 + 16
frame #4: 0x0000000100373f54 simple`func3 + 12
frame #5: 0x0000000100373f68 simple`func2 + 12
frame #6: 0x0000000100373f7c simple`func1 + 12
frame #7: 0x0000000100373f90 simple`main + 12
frame #8: 0x000000018d53c274 dyld`start + 2840
Steps to reproduce:
lldb built with:
cmake -GNinja -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_PROJECTS='clang;lld;compiler-rt;lldb' -DCMAKE_C_COMPILER=$CLANG_BASE_PATH/bin/clang -DCMAKE_CXX_COMPILER=$CLANG_BASE_PATH/bin/clang++ -DCMAKE_ASM_COMPILER=$CLANG_BASE_PATH/bin/clang -DCMAKE_ASM_COMPILER_ID="Clang" -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" -DCMAKE_OSX_SYSROOT=$PWD/../sysroot/MacOSX.sdk -DDARWIN_macosx_CACHED_SYSROOT=$PWD/../sysroot/MacOSX.sdk -DDARWIN_iphoneos_CACHED_SYSROOT=$PWD/../sysroot/iPhoneOS.sdk -DDARWIN_iphonesimulator_CACHED_SYSROOT=$PWD/../sysroot/iPhoneSimulator.sdk ../llvm
and:
$ ninja lldb
at revision: e9c8f75d45
$ cd reproduce_folder
$ cat simple.c
#include <unistd.h>
[[clang::optnone]]
void func4() {
sleep(1000);
}
[[clang::optnone]]
void func3() {
func4();
}
[[clang::optnone]]
void func2() {
func3();
}
[[clang::optnone]]
void func1() {
func2();
}
int main() {
func1();
return 0;
}
$ clang -Os simple.c -o simple
$ ./simple &
[1] 88598
$ sudo crashpad_generate_dump 88598
Password:
$ ~/llvm-project/build/bin/lldb
error: invalid value path 'symbols.swift-module-loading-mode'
(lldb) target create -c minidump.88598
warning: (arm64e) /usr/lib/system/libsystem_kernel.dylib address 0x000000018d8c5000 maps to more than one section: libsystem_kernel.dylib.__DATA_DIRTY and libdyld.dylib.__TEXT
warning: (arm64e) /usr/lib/system/libsystem_platform.dylib address 0x000000018d8f8000 maps to more than one section: libsystem_platform.dylib.__DATA_CONST and libsystem_info.dylib.__TEXT
Core file 'reproduce_folder/minidump.88598' (aarch64) was loaded.
(lldb) bt
* thread #1
* frame #0: 0x000000018d8813c8
frame #1: 0x000000018d760714
(lldb) ^D
// rebuild with `DynamicLoader *GetDynamicLoader() override { return nullptr; }`, or just reset to previous revision, 2ff4c25b7e
diff --git a/lldb/source/Plugins/Process/minidump/ProcessMinidump.h b/lldb/source/Plugins/Process/minidump/ProcessMinidump.h
index 3d235670a3..83ff1512cc 100644
--- a/lldb/source/Plugins/Process/minidump/ProcessMinidump.h
+++ b/lldb/source/Plugins/Process/minidump/ProcessMinidump.h
@@ -53,6 +53,7 @@ public:
Status DoLoadCore() override;
+ DynamicLoader *GetDynamicLoader() override { return nullptr; }
// Returns AUXV structure found in the core file
lldb_private::DataExtractor GetAuxvData() override;
// and recompile lldb
$ ~/work/llvm-project/build/bin/lldb
error: invalid value path 'symbols.swift-module-loading-mode'
(lldb) target create -c minidump.88598
warning: (arm64e) /usr/lib/system/libsystem_kernel.dylib address 0x000000018d8c5000 maps to more than one section: libsystem_kernel.dylib.__DATA_DIRTY and libdyld.dylib.__TEXT
warning: (arm64e) /usr/lib/system/libsystem_platform.dylib address 0x000000018d8f8000 maps to more than one section: libsystem_platform.dylib.__DATA_CONST and libsystem_info.dylib.__TEXT
Core file 'reproduce_folder/minidump.88598' (aarch64) was loaded.
(lldb) bt
* thread #1
* frame #0: 0x000000018d8813c8 libsystem_kernel.dylib`__semwait_signal + 8
frame #1: 0x000000018d760714 libsystem_c.dylib`nanosleep + 220
frame #2: 0x000000018d7696f8 libsystem_c.dylib`sleep + 52
frame #3: 0x0000000100373f40 simple`func4 + 16
frame #4: 0x0000000100373f54 simple`func3 + 12
frame #5: 0x0000000100373f68 simple`func2 + 12
frame #6: 0x0000000100373f7c simple`func1 + 12
frame #7: 0x0000000100373f90 simple`main + 12
frame #8: 0x000000018d53c274 dyld`start + 2840
(lldb) ^D
// rebuild again with change commented out or go back to revision e9c8f75d45
$ ~/work/llvm-project/build/bin/lldb
error: invalid value path 'symbols.swift-module-loading-mode'
(lldb) target create -c minidump.88598
warning: (arm64e) /usr/lib/system/libsystem_kernel.dylib address 0x000000018d8c5000 maps to more than one section: libsystem_kernel.dylib.__DATA_DIRTY and libdyld.dylib.__TEXT
warning: (arm64e) /usr/lib/system/libsystem_platform.dylib address 0x000000018d8f8000 maps to more than one section: libsystem_platform.dylib.__DATA_CONST and libsystem_info.dylib.__TEXT
Core file 'reproduce_folder/minidump.88598' (aarch64) was loaded.
(lldb) bt
* thread #1
* frame #0: 0x000000018d8813c8
frame #1: 0x000000018d760714
(lldb)
</pre>
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