Hello,
I can't actually reproduce the issue, I seem to be missing something.
Server
------
$ sudo apt update
$ sudo apt upgrade
$ sudo apt install samba
$ sudo vim /etc/samba/smb.conf
server min protocol = NT1
[sambashare]
comment = Samba on Ubuntu
path = /home/ubuntu/sambashare
read only = no
browsable = yes
$ mkdir ~/sambashare
$ sudo smbpasswd -a ubuntu
Client
------
$ sudo apt update
$ sudo apt install cifs-utils
$ mkdir ~/share
$ sudo mount -t cifs -o username=ubuntu //192.168.122.185/sambashare ~/share
Password for ubuntu@//192.168.122.185/sambashare:
$ mount -l
...
//192.168.122.185/sambashare on /home/ubuntu/share type cifs
(rw,relatime,vers=3.1.1,cache=strict,username=ubuntu,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.122.185,file_mode=0755,dir_mode=0755,soft,nounix,serverino,mapposix,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1,closetimeo=1)
$ ls
hallo.txt hello.txt sample.txt sample2.txt
$ sudo cp hello.txt hello.txt.1
$ ll
total 2097176
drwxr-xr-x 2 root root 0 Apr 19 04:46 ./
drwxr-x--- 5 ubuntu ubuntu 4096 Apr 19 03:57 ../
-rwxr-xr-x 1 root root 1960 Apr 19 03:55 hallo.txt*
-rwxr-xr-x 1 root root 1960 Apr 19 04:04 hello.txt*
-rwxr-xr-x 1 root root 1960 Apr 19 04:46 hello.txt.1*
-rwxr-xr-x 1 root root 1073741824 Apr 19 04:01 sample.txt*
-rwxr-xr-x 1 root root 1073741824 Apr 19 04:04 sample2.txt*
No oops in dmesg. I'm not sure what I'm doing wrong. Maybe you can help.
Anyway, I had a look at the stack trace, and it seems to be related to
the regression reported here:
https://lore.kernel.org/linux-
mm/a76b370f93cb928c049b94e1fde0d2da506dfcb2.ca...@amazon.com/T/
But I think its slightly different in the Ubuntu 6.5 kernel.
The thread mentions that:
commit 7b2404a886f8b91250c31855d287e632123e1746
Author: David Howells <dhowe...@redhat.com>
Date: Fri Dec 1 00:22:00 2023 +0000
Subject: cifs: Fix flushing, invalidation and file size with copy_file_range()
Link:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7b2404a886f8b91250c31855d287e632123e1746
introduced the issue to Debian's 6.1 kernel.
This got backported to Ubuntu in:
commit 3adbe2ccd8b9b8fde93e03958d6176945794d288
Author: David Howells <dhowe...@redhat.com>
Date: Fri Dec 1 00:22:00 2023 +0000
Subject: cifs: Fix flushing, invalidation and file size with copy_file_range()
$ git describe --contains 3adbe2ccd8b9b8fde93e03958d6176945794d288
Ubuntu-6.5.0-20.20~107
Which we have been using for some time now.
Reading the regression mailing list thread, they mention that things
work differently in 6.1:
> Yeah. __filemap_get_folio() works differently in v6.1.y. There it returns a
> folio or NULL. In 6.7 it returns a folio or a negative error code. The error
> check in cifs_flush_folio() needs to change to something like:
>
> folio = filemap_get_folio(inode->i_mapping, index);
> if (!folio)
> return -ENOMEM;
>
> David
okay... so 6.1 is different from 6.5. Since we were okay with the patch,
we probably didn't need to add anything further.
But they fixed 6.1 with:
commit 21bb2ba4f1ac1e3a57594be62dd74e7b1401b2b1
Author: Steve French <stfre...@microsoft.com>
Date: Fri Jan 12 23:08:51 2024 -0600
Subject: cifs: fix flushing folio regression for 6.1 backport
Link:
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/mantic/commit/?id=21bb2ba4f1ac1e3a57594be62dd74e7b1401b2b1
Now, Ubuntu kernels in between upstream stable releases get patches from
current upstream stable and long term upstream stable trees.
We got both 6.1.x and 6.7.x patches recently...
so we pulled in this fix, and it landed in:
$ git describe --contains 21bb2ba4f1ac1e3a57594be62dd74e7b1401b2b1
Ubuntu-6.5.0-27.28~162
Wow, what a coincidence.
I think this patch is probably not needed in 6.5, and causes the issue.
How about I build you a test kernel with "cifs: fix flushing folio
regression for 6.1 backport" reverted, and then we see if it fixes
things?
If it does, I will send a revert to the kernel team. If it doesn't then
I will have another look.
I'll write back once a test kernel is ready. I'll build you both Jammy
HWE and Mantic kernels.
If you can help me make a reproducer, that would be great. I can test
myself then.
Thanks,
Matthew
** Tags added: seg
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https://bugs.launchpad.net/bugs/2060919
Title:
Remote filesystems mounted as CIFS not working after update to Kernel
"6.5.0-27-generic #28-Ubuntu" (amd64) or Kernel "6.5.0-1014-raspi
#17-Ubuntu" (aarch64).
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