[pve-devel] applied: [PATCH pve-kernel] revert cifs backport to 6.1 added between 6.5.13-1 and 6.5.13-2

[Thomas Lamprecht <t.lamprecht@proxmox.com>]

Am 03/04/2024 um 13:46 schrieb Stoiko Ivanov:
> copying files within a cifs-share currently result in the following
> trace:
> ```
> [  495.388739] BUG: unable to handle page fault for address: fffffffffffffffe
> [  495.388744] #PF: supervisor read access in kernel mode
> [  495.388746] #PF: error_code(0x0000) - not-present page
> [  495.388747] PGD 172c3f067 P4D 172c3f067 PUD 172c41067 PMD 0
> [  495.388752] Oops: 0000 [#2] PREEMPT SMP NOPTI
> [  495.388754] CPU: 1 PID: 3894 Comm: cp Tainted: G      D            6.5.0-32-generic #32-Ubuntu                                                                                                                                                                                [  495.388756] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 4.2023.08-4 02/15/2024
> [  495.388758] RIP: 0010:cifs_flush_folio+0x41/0xf0 [cifs]
> ...
> ```
> 
> a quick check identified proxmox-kernel-6.5.13-2 as the first affected
> version, and `2dc07a11e269bfbe5589e99b60cdbae0118be979` as likely
> source of the issue. The commit adapts the changes from
> `7b2404a886f8b91250c31855d287e632123e1746` to work with the code in
> kernel 6.1.
> This is not needed as the relevant changes were made in 6.4 and
> are already part of the 6.5 tree -
> `66dabbb65d673aef40dd17bf62c042be8f6d4a4b`
> 
> reverting the commit fixes copying files within a samba share.
> 
> Tested/reproduced with:
> * a VM with the kernel as cifs-client
> * one very crude samba-share allowing guest-write access on a Debian
>   bookworm host
> * as well as a share using cifscreds + multiuser (`mount.cifs(8)`)
> * mounting the share, copying any file from one directory to another
>   on the same share (with `cp` and Thunar and Nautilus).
> 
> Reported to Ubuntu upstream at [1].
> 
> [0] https://lore.kernel.org/linux-mm/ZZhrpNJ3zxMR8wcU@eldamar.lan/
> [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2055002
> 
> Reported-by: Daniela Häsler <daniela@proxmox.com>
> Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
> ---
>  ...flushing-folio-regression-for-6.1-ba.patch | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
>  create mode 100644 patches/kernel/0014-Revert-cifs-fix-flushing-folio-regression-for-6.1-ba.patch
> 
>

applied, thanks!