[Bug 261169] [Intel AlderLake]Read&Write files to FAT32 or UFS partition cause data corrupt

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 13 Jan 2022 08:55:47 UTC

            Bug ID: 261169
           Summary: [Intel AlderLake]Read&Write files to FAT32 or UFS
                    partition cause data corrupt
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: vico13.chen@gmail.com

For Intel Adler Lake P core + E core processor (i7-12700T), copying files to
FAT32 partition, the file corrutped (50%), but ZFS is fine. After disabling E
core in the code by restrict the max cpu number, this issue is gone. And No E
core processor has no such issue, like i7-12400.

CPU: Intel AlderLake 12th Gen i7-12700T

There are 3 methods to reproduce this issue:
1. Make FreeBSD 13 USB disk installer, install FreeBSD with UFS, and select
install source and ports, the txz package checking will be failed.

2. Boot to shell by USB disk installer, and mount a FAT32 parition (on SSD),
and copy a 300MB file to the FAT32, compare the sha256 checksums for the source
file and the dst file, the checksum are different (50%). Or if there is a 300MB
file in FAT32 partition, mount the parition, and for the first time check the
sha256 value by running 'sha256 file.tgz', the checksum is wrong, but the
second time, the checksum is correct. 

3. Install FreeBSD 13 with ZFS, and it can work well. And boot into FreeBSD,
disable swap, and format the SWAP partition to FAT32. Do the testing as above.

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