Re: [SCIENTIFIC-LINUX-USERS] XFS memory allocation deadlock

[Bill Maidment]

On 22/08/2019 11:20 pm, Pat Riehecky wrote:

I believe the solution is two fold:

- The SL 7.7 kernel will help prevent the problem from reoccurring
(currently in sl-testing, scheduled for release Monday)
- Existing fragmentation should probably be cleaned up via xfs_fsr[1]



Thanks Pat and others. I will await the updates and make some space 
available for de-fraging.


--
Cheers
Bill

Re: [SCIENTIFIC-LINUX-USERS] XFS memory allocation deadlock

[Pat Riehecky]

I believe the solution is two fold:

- The SL 7.7 kernel will help prevent the problem from reoccurring 
(currently in sl-testing, scheduled for release Monday)

- Existing fragmentation should probably be cleaned up via xfs_fsr[1]

Pat

[1] 
https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-deadlock-kmem_alloc/


On 8/21/19 8:10 PM, Bill Maidment wrote:

Hi
During copying a large file (about 200GB) to a backup hard drive, I am 
getting a multitude of XFS possible memory allocation deadlock messages.

RedHat Portal shows the following:

XFS issues "possible memory allocation deadlock in kmem_alloc" messages
Solution Verified - Updated August 9 2019 at 2:51 AM - English
Issue

    Seeing file system access issues on XFS based file systems.
    dmesg shows continuous entries with:

    XFS: possible memory allocation deadlock in kmem_alloc (mode:0x250)

Does anyone know what the solution is? And if SL7 will get this 
solution soon?




--
Pat Riehecky

Fermi National Accelerator Laboratory
www.fnal.gov
www.scientificlinux.org