Bug Check 0xBF: MUTEX_ALREADY_OWNED
The MUTEX_ALREADY_OWNED bug check has a value of 0x000000BF. This indicates that a thread attempted to acquire ownership of a mutex it already owned.
Important Info If You Have Received a STOP Code
If you received a blue screen error, or stop code, the computer has shut down abruptly to protect itself from data loss. A hardware device, its driver, or related software might have caused this error. If your copy of Windows came with your computer, call the manufacturer of your computer. If you purchased Windows separately from your computer, Microsoft provides support. To find contact info for Microsoft or your computer manufacturer, Contact Support.
If you have experience with computers and want to try to recover from this error, follow the steps provided in the Microsoft article Resolving STOP (Blue Screen) Errors in Windows.
These actions might prevent an error like this from happening again:
- Download and install updates and device drivers for your computer from Windows Update.
- Scan your computer for computer viruses.
- Check your hard disk for errors.
MUTEX_ALREADY_OWNED Parameters
The following parameters are displayed on the blue screen.
| Parameter | Description |
|---|---|
|
1 |
The address of the mutex |
|
2 |
The thread that caused the error |
|
3 |
0 |
|
4 |
Reserved |
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Build date: 4/9/2013
