Re: PANIC: could not flush dirty data: Cannot allocate memory

Hi,

On 2022-11-16 09:16:56 -0800, Andres Freund wrote:
> On 2022-11-15 13:23:56 +0100, klaus(dot)mailinglists(at)pernau(dot)at wrote:
> > Filesystem is ext4. VM technology is mixed: VMware, KVM and XEN PV. Kernel
> > is 5.15.0-52-generic.
> >
> > We have not seen this with Ubutnu 18.04 and 20.04 (although we might not
> > have noticed it).
>
> Did this start after upgrading to 22.04? Or after a certain kernel upgrade?
>
> Do you use cgroups or such to limit memory usage of postgres?
>
> I'd be helpful to see /proc/meminfo from one of the affected instances.

Another interesting thing would be to know the mount and file system options
for the FS that triggers the failures. E.g.
tune2fs -l path/to/blockdev
and
grep path/to/blockdev /proc/mounts

Greetings,

Andres Freund