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Troubleshooting the Stop 0x7A Error
The following sections list the most common sources for this Stop error and suggest some
troubleshooting solutions.
Hard disk hardware or driver issues
Stop 0x7A can be caused by bad sectors in the virtual memory paging file, disk controller
error, virus infection, or memory hardware problems. If parameters 1 and 3 are 0, the stack
signature in the kernel stack is missing, an error typically caused by defective hardware. If
the I/O status is 0xC0000185 and the paging file is on a SCSI disk, check for cabling and
termination issues. An I/O status code of 0xC000009C or 0xC000016A indicates that the
requested data could not be found. You can try to correct this by restarting the computer.
If a problem with disk integrity exists, Autochk, a program that attempts to mark bad disk
sectors as defective so that they are not used in the future, starts automatically. If Autochk
fails to run, you can manually perform the integrity check yourself by following the
instructions to run Chkdsk provided in “Stop 0x00000024 or NTFS_FILE_SYSTEM”
earlier in this chapter.
Memory hardware issues
Another cause of Stop 0x7A messages is defective, malfunctioning, or failed memory
hardware, such as memory modules, Level 2 (L2) SRAM cache, or video adapter RAM. If
you added new hardware recently, remove and replace it to determine if it is causing or
contributing to the problem. Run diagnostics software supplied by the system
manufacturer to determine if the component has failed.
Firmware and driver issues
Check the hardware manufacturer’s Web site for updates to disk adapter firmware or
drivers that improve compatibility. Verify that your firmware, disks, and controller
support the same set of advanced features, such as higher transfer rates. If necessary, select
Important
You can install disk controller drivers that are not present
on the Windows Server 2003 operating system CD by
responding to the following message shortly after starting
setup: “Press F6 if you need to install a third party SCSI or
RAID driver.” When you see this message, press F6, and
when prompted, provide the appropriate storage controller
a slower transfer rate if an update is not yet available. Consult your hardware or device
documentation for more information.
Motherboard issues
The problem might also be caused by cracks, scratched traces, or defective components on
the motherboard. If all else fails, take the system motherboard to a repair facility for
diagnostic testing.
Stop 0x7B or INACCESSIBLE_BOOT_DEVICE
The Stop 0x7B message indicates that Windows Server 2003 has lost access to the system
partition or boot volume during the startup process. There are several circumstances that
can cause this:
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• A hard disk or disk controller has failed.
• A Boot.ini file is configured incorrectly. This often occurs when disks or controllers are
added and change the ARC mapping of existing disks.
• Incorrect disk controller device drivers are installed. This might happen because incorrect
drivers were loaded during Setup, or you are using a system image created by using
different hardware.
• The disk subsystem device driver is faulty.
• The system has a virus infection.
Interpreting the Stop 0x7B Message
This Stop message has four parameters, as listed in Table 10.19.
Table 10.19 Parameters for the Stop 0x7B Message
Parameter Description
Parameter 1 The address of the device object that could not be
mounted, or the Unicode string of ARC name.
Parameter 2 This value is 0x00000000 (zero).
Parameter 3 This value is 0x00000000 (zero).
Parameter 4 This value is 0x00000000 (zero).
The value of parameter 1 determines whether the parameter is a pointer to an ARC name
string (ARC names are a generic method of identifying devices within the ARC
environment) or a device object, because a Unicode string never has an odd number of
bytes, and a device object always has a Type code of 0003.
Troubleshooting the Stop 0x7B Error
The following sections list the most common sources for this Stop error and suggest some
troubleshooting solutions.
Hardware issues
During I/O system initialization, the controller or driver for the startup device (typically
the hard disk) might have failed to initialize the necessary hardware. File system
initialization might have failed because of disk or controller failure, or because the file
system did not recognize the data on the boot device.
Adding new disk hardware
Repartitioning disks, adding new disks, or upgrading to a new disk controller might cause
the startup information in the Boot.ini file or Boot Manager to be become outdated. If a
Stop 0x7B error occurs after you install new disks in your system, edit the Boot.ini file or
adjust the Boot Manager parameters to allow the system to start. If the error occurs after
you upgrade the disk controller, verify that the new hardware is functioning and correctly
configured.
Firmware, disk controller, and driver issues
Verify that the system firmware and disk controller BIOS settings are correct and that the
storage device was properly installed. If you are unsure, consult your computer’s
documentation about restoring default firmware settings or configuring your system to use
automatically detected settings. If the error occurs during Windows Server 2003 Setup, the
problem might be caused by unsupported disk controller hardware. If you are applying a
system image created on another computer, this Stop error might be occurring because the
destination computer has a different disk controller installed. In some cases, drivers for the
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newest hardware are not in the Windows Server 2003 Driver.cab driver library file, and
you need to provide additional drivers to complete Windows Server 2003 Setup
successfully. If this is the case, follow the manufacturer’s instructions when installing
drivers. Periodically check for driver and firmware updates.
Hard disk issues
Hard disk corruption can also cause this Stop error. For more information about checking
hard disk integrity, see the instructions provided in “Stop 0x00000024 or
NTFS_FILE_SYSTEM” earlier in this chapter.
Other suggestions
In addition to the potential causes listed above, viruses can cause the 0x7B Stop error.
Problems that cause 0x7B errors might also cause Stop 0x6B or Stop 0xED errors. For
more information about 0xED Stop errors, see “Stop 0x000000ED or
UNMOUNTABLE_BOOT_VOLUME” later in this chapter.
Stop 0x7F or UNEXPECTED_KERNEL_MODE_TRAP
The Stop 0x7F message indicates that one of two types of problems occurred in kernel-
mode:
• A condition that the kernel is not allowed to have or intercept (also known as a bound
trap).
• A fault occurred while processing an earlier fault (also known as a double fault).
Interpreting the Stop 0x7F Message
This Stop message has four parameters, as listed in Table 10.20.
Table 10.20 Parameters for the Stop 0x7F Message
Parameter Description
Parameter 1 Processor exception code.
Parameter 2 This value is 0x00000000 (zero).
Parameter 3 This value is 0x00000000 (zero).
Parameter 4 This value is 0x00000000 (zero).
Parameter 1 is the most important parameter and can have several different values,
indicating different causes of this error. You can find all conditions that cause a Stop 0x7F
in any x86 microprocessor reference manual because they are specific to the x86 platform.
Table 10.21 lists some of the most common exception codes.
Table 10.21 Common Exception Codes for the Stop 0x7F Message
Exception Code Description
0x00000000: Occurs when a divide (DIV) instruction is run in a kernel
process and the divisor is 0. Memory corruption, other
Divide by Zero
hardware failures, or software problems can cause this error
Error
message.
0x00000004: Occurs when the processor carries out a call to an interrupt
handler when the overflow (OF) flag is set.
Overflow
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0x00000005: Indicates that the processor, while carrying out a BOUND
instruction, found that the operand exceeded the specified
Bounds Check
limits. BOUND instructions ensure that a signed array index
Fault
is within a certain range.
0x00000006: Generated when the processor attempts to run an invalid
instruction. This typically occurs when a hardware memory
Invalid Opcode
problem corrupts the instruction pointer, which then points to
a wrong location.
0x00000008: Indicates an exception while trying to call the handler for a
prior exception. Usually, a processor can handle two
Double Fault
exceptions serially, but certain exceptions (almost always
caused by hardware problems) cause the processor to signal a
double fault.
Less common codes are listed in Table 10.22.
Table 10.22 Less Common Exception Codes for the Stop 0x7F Message
Exception Code Description
0x00000001 A system-debugger call
0x00000003 A debugger breakpoint
0x0000000A A corrupted Task State Segment
0x0000000B An access to a memory segment that was not
present
0x0000000C An access to memory beyond the limits of a
stack
0x0000000D An exception not covered by some other
exception; a protection fault that pertains to
access violations for applications
Troubleshooting the Stop 0x7F Error
The following sections list the most common sources for this Stop error and suggest some
troubleshooting solutions.
Memory hardware issues
Stop 0x7F messages are typically caused by defective, malfunctioning, or failed memory
hardware. If you added new hardware recently, remove and replace it to determine if it is
causing or contributing to the problem. Run diagnostics software supplied by the system
manufacturer to determine if the component has failed.
Processor hardware issues
This Stop error can occur when the processor or the processor cache are failing; if this is
the case, replacing the processor will resolve the problem. Running the processor (or other
components) beyond the rated specification, known as “overclocking,” can cause Stop
0x7F or other error messages due to heat buildup. When diagnosing problems on
overclocked systems, first restore all clock and bus speed settings to the manufacturer-
recommended values to determine if this resolves the issues.
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Motherboard issues
The problem might also be caused by cracks, scratched traces, or defective components on
the motherboard. If all else fails, take the system motherboard to a repair facility for
diagnostic testing.
Software incompatibility issues
Stop 0x7F messages can occur after you install incompatible applications, drivers, or
system services. Contact the software manufacturer about possible Windows Server 2003–
specific updates. Using updated software is especially important for backup programs,
multimedia applications, antivirus scanners, and CD/DVD mastering tools.
Stop 0x9F or DRIVER_POWER_STATE_FAILURE
The Stop 0x9F message indicates that a driver is in an inconsistent or invalid power state.
Interpreting the Stop 0x9F Message
Table 10.23 describes the information provided by Stop 0x9F messages. The value of
parameter 1 indicates the type of violation and determines the meaning of the next three
parameters. In Windows Server 2003 and Microsoft® Windows® XP, these errors have
been superseded by Driver Verifier tests. For more information about Driver Verifier tests,
see the Driver Verifier section of the Windows Server 2003 Driver Development Kits
(DDK). To obtain the DDK, see the Driver Development Kit link on the Web Resources
page at http://www.microsoft.com/windows/reskits/webresources.
Table 10.23 Parameters for the Stop 0x9F Message
Parameter 1 Type of Violation Parameter 2 Parameter 3 Parameter 4
Value Description Description Description
0x00000001 The device object being Pointer to Pointer to Pointer to
freed still has an the target the device the driver
incomplete power device object object
request pending. object
(optional)
0x00000002 The device object Pointer to Pointer to Pointer to
completed the I/O the target the device the driver
request packet (IRP) for device object object
the system power state object
request, but failed to call (optional)
PoStartNextPowerIrp.
0x00000003 The IRP
The device driver did Pointer to Pointer to
not properly set the IRP the target the device
as "pending" or device object
complete the IRP. object
0x00000100 The device objects in the Pointer to Pointer to Pointer to
devnode were the the target the device
inconsistent in their use nonpaged device object to
of device object notify
DO_POWER_PAGABL object
E.
0x0000010 A parent device object Child Child Parent
1 has detected that a child device device device
device has not set the object object object
DO_POWER_PAGAB
LE bit.
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This Stop message typically occurs during events that involve power state transitions, such
as the following:
• Shutting down
• Suspending or resuming from standby mode
• Suspending or resuming from hibernate mode
Troubleshooting the 0x9F Stop Error
The following sections list the most common sources for this Stop error and suggest some
troubleshooting solutions.
Application, driver, or system services issues
Stop 0x9F messages can occur after you install faulty applications, drivers, or system
services. If a file is listed by name and you can associate it with an application, uninstall
the application. For drivers, disable, remove, or roll back the driver to determine if this
resolves the error. If it does, contact the hardware manufacturer for a possible update.
Using up-to-date software is especially important for backup programs, multimedia
applications, antivirus scanners, and CD/DVD mastering tools.
Standby and hibernate mode
For information about troubleshooting standby and hibernate mode issues, see article
Q266169, “How to Troubleshoot Problems with Standby Mode, Hibernate Mode, and
Shutting Down Your Computer in Windows 2000” in the Microsoft Knowledge Base. To
find this article, see the Microsoft Knowledge Base link on the Web Resources page at
http://www.microsoft.com/windows/reskits/webresources.
Stop 0Xbe or ATTEMPTED_WRITE_TO_READONLY_MEMORY
The Stop 0xBE message indicates that a driver attempted to write to read-only memory. If
the driver responsible for the error can be identified, its name is printed in the Stop
message.
Interpreting the Stop 0xBE Message
This Stop message has four parameters, as listed in Table 10.24.
Table 10.24 Parameters for the Stop 0xBE Message
Parameter Description
Parameter 1 Virtual address of attempted write.
Parameter 2 PTE contents.
Parameter 3 This parameter is reserved (set aside for future use).
Parameter 4 This parameter is reserved (set aside for future use).
Troubleshooting the Stop 0xBE Error
The following section describes the most common sources for this Stop error and suggests
a troubleshooting solution.
Driver and system services issues
A Stop 0xBE message might occur after you install a faulty device driver, system service,
or firmware. If a Stop message lists a driver by name, disable, remove, or roll back the
driver to correct the problem. If disabling or removing drivers resolves the issues, contact
the manufacturer about a possible update. Using updated software is especially important
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for multimedia applications, antivirus scanners, DVD playback, and CD/DVD mastering
tools.
Stop 0xC2 or BAD_POOL_CALLER
The Stop 0xC2 message indicates that a kernel-mode process or driver incorrectly
attempted to perform memory operations in the following ways:
• By allocating a memory pool size of zero bytes
• By allocating a memory pool that does not exist
• By attempting to free a memory pool that is already free
• By allocating or freeing a memory pool at an IRQL that was too high
This Stop message is typically due to a faulty driver or software.
Interpreting the Stop 0xC2 Message
Table 10.25 describes the information provided by Stop 0xC2 messages. The value of
parameter 1 indicates the type of violation and determines the meaning of the next three
parameters.
Table 10.25 Parameter Listing for Stop Message 0xC2
Parameter 1 Type of Parameter 2 Parameter Parameter 4
Value Violation Description 3 Description
Descriptio
n
0x00000000 The caller is This value The pool The pool tag
requesting a is always 0 type being being used
zero byte allocated
pool
allocation.
0x00000001 Pool header Pointer to First part This value is
, has been pool header of pool always zero
0x00000002 corrupted. header
, or contents
0x00000004
0x00000006 Reserved
Attempt to Pointer to Pool header
free a pool contents
memory pool header
that was
already freed.
0x00000007 Reserved
Attempt to Memory Pointer to pool
free a contents of header
memory pool the pool
that was block
already freed.
0x00000008 Pool type
Attempt to Current Size of
allocate pool IRQL allocation
at invalid
IRQL.
0x00000009 Pool type
Attempt to Current Address of
free pool at IRQL pool
invalid
IRQL.
0x0000000A The current Address of Allocator’s Tag being
thread pool tag used
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attempted to
free pool
memory by
using the
wrong tag.
0x0000000B The current Address of Pool Bad quota
, thread pool allocation’ process
0x0000000C attempted to s tag pointer
, or release a
0x0000000D quota on a
corrupted
pool
allocation.
0x00000040 Attempt to Starting Start of This value is
free kernel address system always zero
pool at user address
mode space
address.
0x00000041 Attempt to Starting Physical Highest
free a non- address page frame physical page
allocated frame
nonpaged
pool address.
0x00000042 Attempt to Address This value This value is
or free a virtual being freed is always always zero
0x00000043 address that zero
was never in
any pool.
0x00000050 Attempt to Starting Start offset Size in bytes
free a non- address in pages of paged pool
allocated from
paged pool beginning
address. of paged
pool
0x00000060 The current Starting This value This value is
thread address is always always zero
attempted to zero
free an invalid
contiguous
memory
address.
0x00000099 Attempt to free Address This value This value is
pool with being freed is always always zero
invalid address zero
or corruption in
pool header.
Pool type
0x0000009 Attempt to Size of Allocation's
A allocate was allocation pool tag
marked in bytes
MUST_SUCCE
ED.
Pool type
0x0000009 The current Size of Caller’s
B thread allocation address
attempted to in bytes
allocate a pool
with a tag of
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zero.
Pool type
0x0000009 The current Size of Caller’s
C thread allocation address
attempted to in bytes
allocate a
pool with a
tag of "BIG."
Troubleshooting the Stop 0xC2 Error
The following sections list the most common sources for this Stop error and suggest some
troubleshooting solutions.
Driver, system services, and firmware issues
A Stop 0xC2 message might occur after installing a faulty device driver, system service,
or firmware. If a Stop message lists a driver by name, disable, remove, or roll back the
driver to correct the problem. If disabling or removing drivers resolves the issues, contact
the manufacturer about a possible update. Using updated software is especially important
for multimedia applications, antivirus scanners, DVD playback, and CD/DVD mastering
tools.
Hardware issues
A Stop 0xC2 message might also be due to failing or defective hardware. If a Stop
message points to a category of devices (such as disk controllers, for example), try
removing or replacing the hardware to determine if it is causing the problem.
Software compatibility issues
If you encounter a Stop 0xC2 message while upgrading to Windows Server 2003, the
problem might be caused by an incompatible driver, system service, virus scanner, or
backup. To avoid problems while upgrading, simplify your hardware configuration and
remove all third-party device drivers and system services (including virus scanners) prior
to running Setup. After you have successfully installed Windows Server 2003, contact the
hardware manufacturer to obtain compatible updates.
Stop 0xCE or
DRIVER_UNLOADED_WITHOUT_CANCELLING_PENDING_O
PERATIONS
This Stop message indicates that a driver failed to cancel pending operations, deferred
procedure calls, and worker threads before exiting.
Interpreting the Stop 0xCE Message
This Stop message has four parameters, as listed in Table 10.26.
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Table 10.26 Parameters for the Stop 0xCE Message
Parameter Description
Parameter 1 Memory address referenced.
Parameter 2 • Type of access:
• 0x00000000 = read operation
• 0x00000001 = write operation
Parameter 3 If non-zero, the address of the instruction that
referenced the incorrect memory location.
Parameter 4 This parameter is reserved (set aside for future use).
Troubleshooting the Stop 0xCE Error
The following section describes the most common source for this Stop error and suggests
a troubleshooting solution.
Driver and system services issues
Stop 0xCE messages can occur after installing faulty drivers or system services. If a driver
is listed by name, disable, remove, or roll back that driver to confirm that this resolves the
error. If it does, contact the manufacturer about a possible update. Using updated software
is especially important for backup programs, multimedia applications, antivirus scanners,
DVD playback, and CD/DVD mastering tools.
Stop 0xD1 or DRIVER_IRQL_NOT_LESS_OR_EQUAL
The Stop 0xD1 message indicates that the system attempted to access pageable memory
using a kernel process IRQL that was too high. Drivers that use improper addresses
typically cause this error. The problems that cause Stop 0xD1 messages share similarities
with those that generate Stop 0xA errors, in that they can be caused by invalid memory
and access violations.
Interpreting the Stop 0xD1 Message
This Stop message has four parameters, as shown in Table 10.27.
Table 10.27 Parameters for the Stop 0xD1 Message
Parameter Description
Parameter 1 Memory referenced
Parameter 2 IRQL at time of reference
Parameter 3 • Type of access:
• 0x00000000 = read operation
• 0x00000001 = write operation
Parameter 4 Address that referenced memory
Troubleshooting the Stop 0xD1 Error
The following section describes the most common source for this Stop error and suggests
a troubleshooting solution.
Driver and system services issues
Stop 0xD1 messages can occur after you install faulty drivers or system services. If a
driver is listed by name, disable, remove, or roll back that driver to confirm that this
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resolves the error. If it does, contact the manufacturer about a possible update. Using
updated software is especially important for backup programs, multimedia applications,
antivirus scanners, and CD/DVD mastering tools.
Stop 0xD8 or DRIVER_USED_EXCESSIVE_PTES
The Stop 0xD8 message typically occurs if your computer runs out of PTEs because of a
driver that requests large amounts of kernel memory.
Interpreting the Stop 0xD8 Message
Depending on the configuration of your system, the number of parameters returned might
vary, as shown in Table 10.28.
Table 10.28 Parameters for the Stop 0xD8 Message
Parameter Description
Parameter 1 If this parameter has a nonzero value, it contains the
name of the driver that caused the Stop error.
Parameter 2 If the first parameter has a nonzero value, this
parameter contains the number of PTEs used by the
driver that is causing the error.
Parameter 3 This parameter represents the total free system
PTEs.
Parameter 4 This parameter represents the total system PTEs.
Troubleshooting the Stop 0xD8 Error
For suggestions about resolving problems related to inadequate PTEs, see “Stop
0x0000003F or NO_MORE_SYSTEM_PTES” earlier in this chapter.
Stop 0xEA or THREAD_STUCK_IN_DEVICE_DRIVER
A device driver problem is causing the operating system to pause indefinitely. Typically,
this problem is caused by a display driver waiting for the video hardware to enter an idle
state. This might indicate a hardware problem with the video adapter or a faulty video
driver.
Interpreting the Stop 0xEA Message
This Stop message has four parameters, as listed in Table 10.29.
Table 10.29 Parameters for the Stop 0xEA Message
Parameter Description
Parameter 1 Pointer to the thread object that is caught in an infinite loop.
Parameter 2 Pointer to a DEFERRED_WATCHDOG object. This pointer
is useful when you use a kernel debugger to find out more
information about this problem.
Parameter 3 The name of the driver that caused the Stop error.
Parameter 4 When viewing the Stop message in the kernel debugger, this is
the cumulative number of times the 0xEA bug check was
intercepted. When viewing the Stop message on the computer
screen, this parameter is always 0x00000001.
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Troubleshooting the Stop 0xEA Error
The following section describes the most common source for this Stop error and suggests
a troubleshooting solution.
Driver and system services issues
Stop 0xEA messages can occur after you install faulty drivers (especially video drivers) or
system services. If a driver is listed by name, disable, remove, or roll back that driver to
confirm that this resolves the error. If it does, contact the manufacturer about a possible
update. Using updated software is especially important for backup programs, multimedia
applications, antivirus scanners, DVD playback, and CD/DVD mastering tools.
Stop 0xED or UNMOUNTABLE_BOOT_VOLUME
The kernel mode I/O subsystem failed in its attempt to mount the boot volume. This error
might also occur during an upgrade to Windows Server 2003 on operating systems that
use higher-throughput ATA disks, or controllers with incorrect cabling. In some cases,
your operating system might appear to work normally after you restart.
Interpreting the Stop 0xED Message
This Stop message has two parameters, as listed in Table 10.30.
Table 10.30 Parameters for the Stop OxED Message
Parameter Description
Parameter 1 Device object of the boot volume.
Parameter 2 Status code from the file system describing why it
failed to mount the volume.
Parameter 3 This parameter is reserved (set aside for future use).
Parameter 4 This parameter is reserved (set aside for future use).
Troubleshooting the 0xED Stop Error
The following section describes the most common source for this Stop error and suggests
a troubleshooting solution.
Disk controller and throughput issues
Verify that your computer firmware, disk controller, and cabling support the storage
system. For example, using an 80-wire cable is optional for transfer rates up to and
including 33.3 megabytes per second, but is mandatory for higher transfer rates. The
additional grounded pins are required to prevent data loss. Verify that the cables and hard
disks are connected according to the hard disk manufacturer’s specifications.
Some firmware enables you to force higher transfer rates even when you are using the
incorrect cable type. Your firmware might issue a warning but allow the startup process to
proceed. To avoid problems, do not change the default firmware settings for ATA cable
detection.
Other suggestions
Problems that cause Stop 0xED errors might also cause Stop 0x6B and Stop 0x7B errors.
For more information about Stop 0x7B errors, see “Stop 0x0000007B or
INACCESSIBLE_BOOT_DEVICE” earlier in this chapter.
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