Re: [RFC PATCH v3] svcrdma: Introduce Receive buffer arenas

[Chuck Lever <cel@kernel.org>]

On 9/11/25 5:33 PM, Olga Kornievskaia wrote:
> When I have this patch it causes the following panic just from doing
> "systemctl start nfs-server" followed by
> "systemctl stop nfs-server"
> 
> [   69.705986] Unable to handle kernel paging request at virtual
> address dfff800000000001
> [   69.706706] KASAN: null-ptr-deref in range
> [0x0000000000000008-0x000000000000000f]
> [   69.707299] Mem abort info:
> [   69.707514]   ESR = 0x0000000096000005
> [   69.707787]   EC = 0x25: DABT (current EL), IL = 32 bits
> [   69.708186]   SET = 0, FnV = 0
> [   69.708415]   EA = 0, S1PTW = 0
> [   69.708637]   FSC = 0x05: level 1 translation fault
> [   69.708986] Data abort info:
> [   69.709203]   ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
> [   69.709604]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
> [   69.709986]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> [   69.710345] [dfff800000000001] address between user and kernel address ranges
> [   69.710842] Internal error: Oops: 0000000096000005 [#1]  SMP

Yep, I've hit this. I'm dropping the patch from nfsd-testing until
the issue is addressed. Thanks for the report.


-- 
Chuck Lever