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SubjectRe: [PATCH 0/3] btrfs: Replace kmap() with kmap_local_page()
On Thu, Jun 02, 2022 at 08:20:08AM -0700, Christoph Hellwig wrote:
> Turns out that while this looks good, it actually crashes when
> running xfstests. I think this is due to the fact that kmap sets
> the page address, which kmap_local_page does not.
>
> btrfs/150 1s ... [ 168.252943] run fstests btrfs/150 at 2022-06-02 15:17:11
> [ 169.462292] BTRFS info (device vdb): flagging fs with big metadata feature
> [ 169.463728] BTRFS info (device vdb): disk space caching is enabled
> [ 169.464953] BTRFS info (device vdb): has skinny extents
> [ 170.596218] BTRFS: device fsid 37c6bae1-d3e5-47f8-87d5-87cd7240a1b4
> devid 1 transid 5 /dev)
> [ 170.599471] BTRFS: device fsid 37c6bae1-d3e5-47f8-87d5-87cd7240a1b4 devid 2 transid 5 /dev)
> [ 170.657170] BTRFS info (device vdc): flagging fs with big metadata feature
> [ 170.659509] BTRFS info (device vdc): use zlib compression, level 3
> [ 170.661190] BTRFS info (device vdc): disk space caching is enabled
> [ 170.670706] BTRFS info (device vdc): has skinny extents
> [ 170.714181] BTRFS info (device vdc): checking UUID tree
> [ 170.735058] BUG: kernel NULL pointer dereference, address: 0000000000000008
> [ 170.736478] #PF: supervisor read access in kernel mode
> [ 170.737457] #PF: error_code(0x0000) - not-present page
> [ 170.738529] PGD 0 P4D 0
> [ 170.739211] Oops: 0000 [#1] PREEMPT SMP PTI
> [ 170.740101] CPU: 0 PID: 43 Comm: kworker/u4:3 Not tainted 5.18.0-rc7+ #1539
> [ 170.741478] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
> [ 170.743246] Workqueue: btrfs-delalloc btrfs_work_helper
> [ 170.744282] RIP: 0010:zlib_compress_pages+0x128/0x670

I've just hit the crash too, so I've removed the patches from misc-next
until there's fixed version.

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