linux-kernel - Re: Bug#1120602: [REGRESSION 6.12.y] hyper-v: BUG: kernel NULL pointer dereference, address: 00000000000000a0: RIP: 0010:hv_uio_channel_cb+0xd/0x20 [uio_hv

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Message-ID: <d3f83ff0-2c4d-4698-a71d-1530b8a2bde7@linux.microsoft.com>
Date: Wed, 26 Nov 2025 11:45:05 +0530
From: Naman Jain <namjain@...ux.microsoft.com>
To: Peter Morrow <pdmorrow@...il.com>
Cc: Salvatore Bonaccorso <carnil@...ian.org>, 1120602@...s.debian.org,
 Long Li <longli@...rosoft.com>, linux-hyperv@...r.kernel.org,
 linux-kernel@...r.kernel.org, regressions@...ts.linux.dev,
 stable@...r.kernel.org, John Starks <jostarks@...rosoft.com>,
 Michael Kelley <mhklinux@...look.com>, Tianyu Lan <tiala@...rosoft.com>,
 "K. Y. Srinivasan" <kys@...rosoft.com>,
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
 Dexuan Cui <decui@...rosoft.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: Bug#1120602: [REGRESSION 6.12.y] hyper-v: BUG: kernel NULL
 pointer dereference, address: 00000000000000a0: RIP:
 0010:hv_uio_channel_cb+0xd/0x20 [uio_hv_generic]

On 11/21/2025 3:34 PM, Peter Morrow wrote:
> Hi Naman/Salvatore,
> 
> Is it possible to get this fixed in the 6.1 LTS series too? I just ran
> into this crash when moving from bookworm based Debian kernel
> 6.1.153-1 to 6.1.158-1. I saw that "uio_hv_generic: Let userspace take
> care of interrupt mask" appeared in 6.1.156.
> 
> Thanks,
> Peter.
> 

Hi Peter,
Yes, I have sent a patch for older kernel versions as well.
I am working to fix the review comments and send new revisions.

Here is the link:
https://lore.kernel.org/all/20251115085937.2237-1-namjain@linux.microsoft.com/

Regards,
Naman