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Fix random "ERROR_FILE_NOT_FOUND" when unmounting with absolute path #40092

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Fix random "ERROR_FILE_NOT_FOUND" when unmounting with absolute path #40092

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d32ca58
Fix file not found when unmounting with absolute path
chemwolf6922 Apr 3, 2026
a54d67a
Add unit test
chemwolf6922 Apr 7, 2026
324a23b
Merge branch 'master' into user/chemwolf6922/fix-unmount-file-not-found
chemwolf6922 Apr 8, 2026
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5 changes: 2 additions & 3 deletions src/windows/common/WslClient.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1218,9 +1218,8 @@ int Unmount(_In_ const std::wstring& arg)
wsl::windows::common::SvcComm service;
const HRESULT result = wil::ResultFromException([&] { value = service.DetachDisk(disk); });

// support relative paths in unmount
// check is the result is the error code for "file not found" and the path is relative
if (result == HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND) && PathIsRelative(disk))
// Retry with the normalized path to handle relative paths and \\?\ prefix mismatches.
if (result == HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND))
{
// retry dismounting with the absolute path
const auto absoluteDisk = wsl::windows::common::filesystem::GetFullPath(filesystem::UnquotePath(disk).c_str());
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23 changes: 23 additions & 0 deletions test/windows/MountTests.cpp
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Expand Up @@ -450,6 +450,29 @@ class MountTests
VERIFY_ARE_EQUAL(LxsstuLaunchWsl(L"--unmount " + absolutePath.wstring()), (DWORD)0);
}

TEST_METHOD(AbsolutePathVhdUnmountAfterVMTimeout)
{
SKIP_UNSUPPORTED_ARM64_MOUNT_TEST();
WSL2_TEST_ONLY();

WslKeepAlive keepAlive;

VERIFY_ARE_EQUAL(LxsstuLaunchWsl(L"--mount " TEST_MOUNT_VHD L" --vhd --bare"), (DWORD)0);

const auto disk = GetBlockDeviceInWsl();
VERIFY_IS_TRUE(IsBlockDevicePresent(disk));

WaitForVmTimeout(keepAlive);

const auto absolutePath = std::filesystem::absolute(TEST_MOUNT_VHD);

// Validate that the vhd path doesn't start with '\\?'
VERIFY_IS_FALSE(absolutePath.wstring().starts_with(L"\\"));

// Validate the unmounting by absolute path is successful
VERIFY_ARE_EQUAL(LxsstuLaunchWsl(L"--unmount " + absolutePath.wstring()), (DWORD)0);
}

// Attach a disk, but don't mount it
TEST_METHOD(TestBareMount)
{
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