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Your message dated Fri, 02 Jan 2026 10:47:16 +0000
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and subject line Bug#1120602: fixed in linux 6.1.159-1
has caused the Debian Bug report #1120602,
regarding hyper-v: BUG: kernel NULL pointer dereference, address:
00000000000000a0
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1120602: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1120602
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From: Peter Morrow
To: Debian Bug Tracking System
Subject: hyper-v: BUG: kernel NULL pointer dereference, address:
00000000000000a0
Message-ID: <176298819854.487825.11724175116974643582.reportbug@p15v.lan>
X-Mailer: reportbug 13.2.0
Date: Wed, 12 Nov 2025 22:56:38 +0000
Delivered-To: submit@bugs.debian.org
Package: src:linux
Version: 6.12.57-1
Severity: important
X-Debbugs-Cc: pdmorrow@gmail.com
Dear Maintainer,
I'm seeing a kernel crash quite soon after boot on a debian trixie based
system running 6.12.57+deb13-amd64, unfortunately the kernel panics before
I can access the system to gather more information. Thus I'll provide details
of the system using a previously known good version. The panic is happening
100% of the time unfortunately. I have access to the serial console however
so can enable any required verbose logging during boot if necessary.
Crucially the crash is not seen with kernel version 6.12.41+deb13-amd64 with
the
same userspace. We had pinned to that version until very recently to in order
to work around https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1109676
I'm running a dpdk application here (VPP) on Azure, VM form factor is a
"Standard DS3 v2 (4 vcpus, 14 GiB memory)".
The only relevant upstream commit in this area (as far as I can see) is:
https://lore.kernel.org/linux-hyperv/1bb599ee-fe28-409d-b430-2fc
86268936@linux.microsoft.com/
The comment regarding avoiding races at start adds a bit more weight behind
this
hunch, though it's only a hunch as I am most definitely nowhere near an expert
in this area.
-- Package-specific info:
[ 19.625535] BUG: kernel NULL pointer dereference, address: 00000000000000a0
[ 19.628874] #PF: supervisor read access in kernel mode
[ 19.630841] #PF: error_code(0x0000) - not-present page
[ 19.632788] PGD 0 P4D 0
[ 19.633905] Oops: Oops: 0000 [#1] PREEMPT SMP PTI
[ 19.635586] CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted
.12.57+deb13-amd64 #1 Debian 6.12.57-1
[ 19.640216] Hardware name: Microsoft Corporation Virtual Machine/Virtual
Machine, BIOS Hyper-V UEFI Release v4.1 09/28/2024
[ 19.644514] RIP: 0010:hv_uio_channel_cb+0xd/0x20 [uio_hv_generic]
[ 19.646994] Code: 02 00 00 5b 5d e9 53 98 69 e9 0f 1f 00 90 90 90 90 90 90
90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 48 8b 47 10 <48> 8b
b8 a0 00 00 00 f0 83 44 24 fc 00 e9 51 6f fa ff 90 90 90 90
[ 19.654377] RSP: 0018:ffffb15ac01a4fa8 EFLAGS: 00010046
[ 19.656385] RAX: 0000000000000000 RBX: 0000000000000015 RCX:
000000000000015
[ 19.659240] RDX: 0000000000000001 RSI: ffffffffffffffff RDI:
fff8ff69c759400
[ 19.662168] RBP: ffff8ff548790200 R08: ffff8ff548790200 R09:
0fca75150b080e9
[ 19.665239] R10: 0000000000000000 R11: ffffb15ac01a4ff8 R12:
fff8ff871dc1480
[ 19.668193] R13: ffff8ff69c759400 R14: ffff8ff69c7596a0 R15:
fffffffc106e160
[ 19.671106] FS: 0000000000000000(0000) GS:ffff8ff871d80000(0000)
knlGS:0000000000000000
[ 19.674281] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
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