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[LLDB][Minidump] Minidump erase file on failure #108259

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Merged
merged 7 commits into from
Sep 13, 2024
Merged

[LLDB][Minidump] Minidump erase file on failure #108259

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022173d
Unlink file on failure
Jlalond Sep 11, 2024
8a51bd0
Add test to ensure file is deleted upon failure
Jlalond Sep 11, 2024
7150acb
use RAII object
Jlalond Sep 11, 2024
233f5cc
Run formatter
Jlalond Sep 11, 2024
cd89bcf
Rename the RAII object
Jlalond Sep 12, 2024
33b6474
Add error message assertion to test
Jlalond Sep 12, 2024
cbfe997
Run python formatter
Jlalond Sep 13, 2024
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12 changes: 12 additions & 0 deletions lldb/source/Plugins/ObjectFile/Minidump/MinidumpFileBuilder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1218,3 +1218,15 @@ Status MinidumpFileBuilder::DumpFile() {

return error;
}

void MinidumpFileBuilder::DeleteFile() noexcept {
Log *log = GetLog(LLDBLog::Object);

if (m_core_file) {
Status error = m_core_file->Close();
if (error.Fail())
LLDB_LOGF(log, "Failed to close minidump file: %s", error.AsCString());

m_core_file.reset();
}
}
3 changes: 3 additions & 0 deletions lldb/source/Plugins/ObjectFile/Minidump/MinidumpFileBuilder.h
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Expand Up @@ -115,6 +115,9 @@ class MinidumpFileBuilder {
// Run cleanup and write all remaining bytes to file
lldb_private::Status DumpFile();

// Delete the file if it exists
void DeleteFile() noexcept;

private:
// Add data to the end of the buffer, if the buffer exceeds the flush level,
// trigger a flush.
Expand Down
18 changes: 18 additions & 0 deletions lldb/source/Plugins/ObjectFile/Minidump/ObjectFileMinidump.cpp
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Expand Up @@ -55,6 +55,21 @@ size_t ObjectFileMinidump::GetModuleSpecifications(
return 0;
}

struct DumpFailRemoveHolder {
DumpFailRemoveHolder(MinidumpFileBuilder &builder) : m_builder(builder) {}

~DumpFailRemoveHolder() {
if (!m_success)
m_builder.DeleteFile();
Comment on lines +62 to +63
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We should emit visible error message telling end user that saving minidump has failed instead of silently fail and remove minidump file.

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I'll have to get the patch, it's one of my SBSaveCore API changes, but we now print the error when Plugin Manager returns, we could print twice, one specific for minidump

}

void SetSuccess() { m_success = true; }

private:
MinidumpFileBuilder &m_builder;
bool m_success = false;
};

bool ObjectFileMinidump::SaveCore(const lldb::ProcessSP &process_sp,
lldb_private::SaveCoreOptions &options,
lldb_private::Status &error) {
Expand All @@ -75,6 +90,7 @@ bool ObjectFileMinidump::SaveCore(const lldb::ProcessSP &process_sp,
}
MinidumpFileBuilder builder(std::move(maybe_core_file.get()), process_sp,
options);
DumpFailRemoveHolder request(builder);

Log *log = GetLog(LLDBLog::Object);
error = builder.AddHeaderAndCalculateDirectories();
Expand Down Expand Up @@ -133,5 +149,7 @@ bool ObjectFileMinidump::SaveCore(const lldb::ProcessSP &process_sp,
return false;
}

request.SetSuccess();

return true;
}
29 changes: 29 additions & 0 deletions lldb/test/API/functionalities/process_save_core_minidump/TestProcessSaveCoreMinidump.py
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Expand Up @@ -493,3 +493,32 @@ def test_save_minidump_custom_save_style_duplicated_regions(self):

finally:
self.assertTrue(self.dbg.DeleteTarget(target))

@skipUnlessPlatform(["linux"])
def minidump_deleted_on_save_failure(self):
"""Test that verifies the minidump file is deleted after an error"""

self.build()
exe = self.getBuildArtifact("a.out")
try:
target = self.dbg.CreateTarget(exe)
process = target.LaunchSimple(
None, None, self.get_process_working_directory()
)
self.assertState(process.GetState(), lldb.eStateStopped)

custom_file = self.getBuildArtifact("core.should.be.deleted.custom.dmp")
options = lldb.SBSaveCoreOptions()
options.SetOutputFile(lldb.SBFileSpec(custom_file))
options.SetPluginName("minidump")
options.SetStyle(lldb.eSaveCoreCustomOnly)
# We set custom only and have no thread list and have no memory.
error = process.SaveCore(options)
self.assertTrue(error.Fail())
self.assertIn(
"no valid address ranges found for core style", error.GetCString()
)
self.assertTrue(not os.path.isfile(custom_file))

finally:
self.assertTrue(self.dbg.DeleteTarget(target))
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