Fixes trying to create a module using a trash as the address of the module #119031
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Pull Request Overview
This PR fixes a bug where trash values in vmModule could cause incorrect module creation during debugging operations. The issue was introduced in a previous PR that simplified module lookup logic but inadvertently allowed uninitialized vmModule values to be used as valid addresses.
- Explicitly sets
vmModuleto NULL to prevent using uninitialized/trash values - Prevents creation of spurious modules with invalid addresses in the debugger
hoyosjs
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Aug 23, 2025
This was referenced Aug 23, 2025
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Tagging subscribers to this area: @steveisok, @dotnet/dotnet-diag |
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/backport to release/10.0 |
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Started backporting to release/10.0: https://github.com/dotnet/runtime/actions/runs/17209922808 |
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In this PR #118414, this code was changed:
FROM:
pModule = m_modules.GetBase(vmDomainAssembly.IsNull() ? VmPtrToCookie(vmModule) : mPtrToCookie(vmDomainAssembly));TO:
pModule = m_modules.GetBase(VmPtrToCookie(vmModule));But vmModule can contain trash value so it will not find a module in m_module and this will make it try to create a new module using this trash address in the CordbModule constructor.
I don't know if this needs to be fixed in other places, but this place for sure is causing issues. Not sure how it was not detected on other platforms, I detected it on android.