When Sending vendor request system getting hanged .

NTDEV
1

Hello Everyone,

I am working on a USB driver in which need to send the vendor request from the usb driver to the device to getting the status of the device.

its working fine but some times when sending the vendor request to the device then system getting hanged and giving an assertion error.

Assertion failure - code c0000420

Please do the needful.

2

On Wed, Mar 29, 2017 at 10:24 AM, wrote:

> c0000420

the status code is just “assertion failure”. You need to run !analyze -v in
the debugger to start figuring out what you have done wrong. Post the
output from that here. If your symbols are set correctly it should point
you pretty close to what you did wrong.

Mark Roddy

3

Thanks Mark for reply, I have tried as per your suggestion and found this issues.

Assertion failure - code c0000420 (first chance)
nt!KeSetCoalescableTimer+0x8de:
82887bf4 cd2c int 2Ch

When i put the command !analyze -v then a continuous log is coming on windbg command prompt.

4

On Wed, Apr 5, 2017 at 10:02 AM, wrote:

> When i put the command !analyze -v then a continuous log is coming on
> windbg command prompt.

Then you have a debugging configuration malfunction. Analyze might produce
a lot of output, but it ain’t “continuous”. Post an excerpt.

Mark Roddy