Especially when trying out devices driven by Intel Rapid Storage Technology, some Windows 10 21H1 devices experienced problems including crashes and blue screens after installing the cumulative update KB5001391 released in May of this year. However, these bugs have been fixed in the cumulative update of the same name released on Patch Tuesday in May.
Windows 10 21H1 users experienced a blue screen of death or a green screen error BAD_POOL_CALLER after installing KB5001391. Microsoft stated that only a few devices were affected, especially those using the Intel RST driver.
User feedback: “I am using Insider Preview Build 19043.928 (21H1). Yesterday. After installing Windows Update KB5001391, my computer always encounters a green error screen for about one minute after logging in and automatically restarts. I had to uninstall the update to stop the loop restart”.
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Another user feedback: “It seems that KB5001391 causes my machine to keep showing a blue screen (actually green) and a bad_pool_call error. My device seems to be stable after removing the KB.”
The good news is that Microsoft has fixed this issue before the cumulative update rollout in May 2021. In a supporting document released on April 28, Microsoft confirmed that the blue or green screen error BAD_POOL_CALLER has been fixed in another update of the same patch.
Microsoft wrote in the update log: “We have fixed a problem that caused 0xC2 (BAD_POOL_CALLER) error checking when using IOCTL_SCSI_PASS_THROUGH_DIRECT.” In addition, Microsoft has also fixed some audio driver issues, which means that more devices can be compatible with the 21H1 update.
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