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SubjectRe: [PATCH 0/3] btrfs: Replace kmap() with kmap_local_page()
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
[ 170.745346] Code: 00 00 00 16 00 00 48 01 e8 31 ed 48 c1 f8 06 48 c1 e0 0c 48 01 f8 49 89 0
[ 170.749042] RSP: 0018:ffffc9000038bc70 EFLAGS: 00010286
[ 170.750037] RAX: 0000000000000001 RBX: ffffc9000038bdb8 RCX: 0000000000000001
[ 170.751351] RDX: 0000000000002000 RSI: ffffffff82f532fb RDI: ffff888000000000
[ 170.752695] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
[ 170.754106] R10: 0000000000000000 R11: ffff8881039a5b30 R12: ffff888107befb48
[ 170.755449] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
[ 170.756922] FS: 0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
[ 170.758642] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 170.759714] CR2: 0000000000000008 CR3: 000000010ab60000 CR4: 00000000000006f0
[ 170.761082] Call Trace:
[ 170.761553] <TASK>
[ 170.761968] ? _raw_spin_unlock+0x24/0x40
[ 170.762776] btrfs_compress_pages+0xda/0x120
[ 170.763682] compress_file_range+0x3b9/0x840
[ 170.764570] async_cow_start+0xd/0x30
[ 170.765308] ? submit_compressed_extents+0x3c0/0x3c0
[ 170.766241] btrfs_work_helper+0xf5/0x3f0
[ 170.767009] ? lock_is_held_type+0xe2/0x140
[ 170.767817] process_one_work+0x239/0x550
[ 170.768633] ? process_one_work+0x550/0x550
[ 170.769447] worker_thread+0x4d/0x3a0
[ 170.770210] ? process_one_work+0x550/0x550
[ 170.771019] kthread+0xe2/0x110
[ 170.771623] ? kthread_complete_and_exit+0x20/0x20
[ 170.772697] ret_from_fork+0x22/0x30
[ 170.773454] </TASK>

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