Bug#1127599: linux-image-6.12.69+deb13-amd64: gre6 tunnels no longer work after upgrading to linux-image-6.12.69+deb13-amd64

Package: src:linux
Version: 6.12.69-1
Severity: critical
Tags: ipv6
Justification: breaks the whole system
X-Debbugs-Cc: [email protected]
User: [email protected]
Usertags: amd64

Dear Maintainer,

After upgrading to linux-image-6.12.69+deb13-amd64 tonight, multiple GRE6 tunnels are no longer operational.
Both sides of the GRE6 tunnel are running Debian 13 with linux-image-6.12.69+deb13-amd64.

On both sides, the RX error counter simply keeps increasing.

GRE4 tunnels seem to not be affected, and remain operational.

The release notes for linux-image-6.12.69+deb13-amd64 list:

     - ip6_gre: make ip6gre_header() robust

I would assume a relation.

All PCAPs look normal so far.

** Model information
sys_vendor: QEMU
product_name: Standard PC (i440FX + PIIX, 1996)
product_version: pc-i440fx-9.0
chassis_vendor: QEMU
chassis_version: pc-i440fx-9.0
bios_vendor: SeaBIOS
bios_version: rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org

** Configuration for modprobe:
blacklist pcspkr
blacklist floppy
blacklist arkfb
blacklist aty128fb
blacklist atyfb
blacklist radeonfb
blacklist cirrusfb
blacklist cyber2000fb
blacklist kyrofb
blacklist matroxfb_base
blacklist mb862xxfb
blacklist neofb
blacklist pm2fb
blacklist pm3fb
blacklist s3fb
blacklist savagefb
blacklist sisfb
blacklist tdfxfb
blacklist tridentfb
blacklist vt8623fb
options snd_pcsp index=-2
options cx88_alsa index=-2
options snd_atiixp_modem index=-2
options snd_intel8x0m index=-2
options snd_via82xx_modem index=-2
options bonding max_bonds=0
options dummy numdummies=0
options ifb numifbs=0

** PCI devices:
00:00.0 Host bridge [0600]: Intel Corporation 440FX - 82441FX PMC [Natoma] [8086:1237] (rev 02)
	Subsystem: Red Hat, Inc. Qemu virtual machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.0 ISA bridge [0601]: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] [8086:7000]
	Subsystem: Red Hat, Inc. Qemu virtual machine [1af4:1100]
	Physical Slot: 1
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.1 IDE interface [0101]: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] [8086:7010] (prog-if 80 [ISA Compatibility mode-only controller, supports bus mastering])
	Subsystem: Red Hat, Inc. Qemu virtual machine [1af4:1100]
	Physical Slot: 1
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Region 0: I/O ports at 01f0 [size=8]
	Region 1: I/O ports at 03f4
	Region 2: I/O ports at 0170 [size=8]
	Region 3: I/O ports at 0374
	Region 4: I/O ports at e120 [size=16]
	Kernel driver in use: ata_piix
	Kernel modules: ata_piix, ata_generic

00:01.2 USB controller [0c03]: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] [8086:7020] (rev 01) (prog-if 00 [UHCI])
	Subsystem: Red Hat, Inc. QEMU Virtual Machine [1af4:1100]
	Physical Slot: 1
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin D routed to IRQ 11
	Region 4: I/O ports at e0c0 [size=32]

00:01.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 03)
	Subsystem: Red Hat, Inc. Qemu virtual machine [1af4:1100]
	Physical Slot: 1
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin A routed to IRQ 9

00:02.0 VGA compatible controller [0300]: Device [1234:1111] (rev 02) (prog-if 00 [VGA controller])
	Subsystem: Red Hat, Inc. Device [1af4:1100]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Region 0: Memory at fd000000 (32-bit, prefetchable) [size=16M]
	Region 2: Memory at fea90000 (32-bit, non-prefetchable) [size=4K]
	Expansion ROM at 000c0000 [disabled] [size=128K]

00:03.0 Unclassified device [00ff]: Red Hat, Inc. Virtio memory balloon [1af4:1002]
	Subsystem: Red Hat, Inc. Device [1af4:0005]
	Physical Slot: 3
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 11
	Region 0: I/O ports at e000 [size=64]
	Region 4: Memory at fe400000 (64-bit, prefetchable) [size=16K]
	Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
		BAR=0 offset=00000000 size=00000000
	Capabilities: [70] Vendor Specific Information: VirtIO: Notify
		BAR=4 offset=00003000 size=00001000 multiplier=00000004
	Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
		BAR=4 offset=00002000 size=00001000
	Capabilities: [50] Vendor Specific Information: VirtIO: ISR
		BAR=4 offset=00001000 size=00001000
	Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
		BAR=4 offset=00000000 size=00001000
	Kernel driver in use: virtio-pci

00:05.0 SCSI storage controller [0100]: Red Hat, Inc. Virtio SCSI [1af4:1004]
	Subsystem: Red Hat, Inc. Device [1af4:0008]
	Physical Slot: 5
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at e040 [size=64]
	Region 1: Memory at fea91000 (32-bit, non-prefetchable) [size=4K]
	Region 4: Memory at fe404000 (64-bit, prefetchable) [size=16K]
	Capabilities: [98] MSI-X: Enable+ Count=11 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
		BAR=0 offset=00000000 size=00000000
	Capabilities: [70] Vendor Specific Information: VirtIO: Notify
		BAR=4 offset=00003000 size=00001000 multiplier=00000004
	Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
		BAR=4 offset=00002000 size=00001000
	Capabilities: [50] Vendor Specific Information: VirtIO: ISR
		BAR=4 offset=00001000 size=00001000
	Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
		BAR=4 offset=00000000 size=00001000
	Kernel driver in use: virtio-pci

00:08.0 Communication controller [0780]: Red Hat, Inc. Virtio console [1af4:1003]
	Subsystem: Red Hat, Inc. Device [1af4:0003]
	Physical Slot: 8
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 11
	Region 0: I/O ports at e080 [size=64]
	Region 1: Memory at fea92000 (32-bit, non-prefetchable) [size=4K]
	Region 4: Memory at fe408000 (64-bit, prefetchable) [size=16K]
	Capabilities: [98] MSI-X: Enable+ Count=2 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
		BAR=0 offset=00000000 size=00000000
	Capabilities: [70] Vendor Specific Information: VirtIO: Notify
		BAR=4 offset=00003000 size=00001000 multiplier=00000004
	Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
		BAR=4 offset=00002000 size=00001000
	Capabilities: [50] Vendor Specific Information: VirtIO: ISR
		BAR=4 offset=00001000 size=00001000
	Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
		BAR=4 offset=00000000 size=00001000
	Kernel driver in use: virtio-pci

00:12.0 Ethernet controller [0200]: Red Hat, Inc. Virtio network device [1af4:1000]
	Subsystem: Red Hat, Inc. Device [1af4:0001]
	Physical Slot: 18
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at e0e0 [size=32]
	Region 1: Memory at fea93000 (32-bit, non-prefetchable) [size=4K]
	Region 4: Memory at fe40c000 (64-bit, prefetchable) [size=16K]
	Expansion ROM at fea00000 [disabled] [size=256K]
	Capabilities: [98] MSI-X: Enable+ Count=4 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
		BAR=0 offset=00000000 size=00000000
	Capabilities: [70] Vendor Specific Information: VirtIO: Notify
		BAR=4 offset=00003000 size=00001000 multiplier=00000004
	Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
		BAR=4 offset=00002000 size=00001000
	Capabilities: [50] Vendor Specific Information: VirtIO: ISR
		BAR=4 offset=00001000 size=00001000
	Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
		BAR=4 offset=00000000 size=00001000
	Kernel driver in use: virtio-pci

00:13.0 Ethernet controller [0200]: Red Hat, Inc. Virtio network device [1af4:1000]
	Subsystem: Red Hat, Inc. Device [1af4:0001]
	Physical Slot: 19
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 11
	Region 0: I/O ports at e100 [size=32]
	Region 1: Memory at fea94000 (32-bit, non-prefetchable) [size=4K]
	Region 4: Memory at fe410000 (64-bit, prefetchable) [size=16K]
	Expansion ROM at fea40000 [disabled] [size=256K]
	Capabilities: [98] MSI-X: Enable+ Count=4 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
		BAR=0 offset=00000000 size=00000000
	Capabilities: [70] Vendor Specific Information: VirtIO: Notify
		BAR=4 offset=00003000 size=00001000 multiplier=00000004
	Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
		BAR=4 offset=00002000 size=00001000
	Capabilities: [50] Vendor Specific Information: VirtIO: ISR
		BAR=4 offset=00001000 size=00001000
	Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
		BAR=4 offset=00000000 size=00001000
	Kernel driver in use: virtio-pci

00:1e.0 PCI bridge [0604]: Red Hat, Inc. QEMU PCI-PCI bridge [1b36:0001] (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin A routed to IRQ 10
	Region 0: Memory at fea95000 (64-bit, non-prefetchable) [size=256]
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: d000-dfff [size=4K] [16-bit]
	Memory behind bridge: fe800000-fe9fffff [size=2M] [32-bit]
	Prefetchable memory behind bridge: fe200000-fe3fffff [size=2M] [32-bit]
	Secondary status: 66MHz+ FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [4c] MSI: Enable- Count=1/1 Maskable+ 64bit+
		Address: 0000000000000000  Data: 0000
		Masking: 00000000  Pending: 00000000
	Capabilities: [48] Slot ID: 0 slots, First+, chassis 01
	Capabilities: [40] Hot-plug capable

00:1f.0 PCI bridge [0604]: Red Hat, Inc. QEMU PCI-PCI bridge [1b36:0001] (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin A routed to IRQ 11
	Region 0: Memory at fea96000 (64-bit, non-prefetchable) [size=256]
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
	I/O behind bridge: c000-cfff [size=4K] [16-bit]
	Memory behind bridge: fe600000-fe7fffff [size=2M] [32-bit]
	Prefetchable memory behind bridge: fe000000-fe1fffff [size=2M] [32-bit]
	Secondary status: 66MHz+ FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [4c] MSI: Enable- Count=1/1 Maskable+ 64bit+
		Address: 0000000000000000  Data: 0000
		Masking: 00000000  Pending: 00000000
	Capabilities: [48] Slot ID: 0 slots, First+, chassis 02
	Capabilities: [40] Hot-plug capable


** USB devices:
not available


-- System Information:
Debian Release: 13.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.69+deb13-cloud-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-6.12.69+deb13-amd64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.148.3
ii  kmod                                    34.2-2
ii  linux-base                              4.12

Versions of packages linux-image-6.12.69+deb13-amd64 recommends:
ii  apparmor  4.1.0-1

Versions of packages linux-image-6.12.69+deb13-amd64 suggests:
pn  debian-kernel-handbook               <none>
ii  firmware-linux-free                  20241210-2
pn  grub-pc | grub-efi-amd64 | extlinux  <none>
pn  linux-doc-6.12                       <none>

Versions of packages linux-image-6.12.69+deb13-amd64 is related to:
pn  firmware-amd-graphics      <none>
pn  firmware-atheros           <none>
pn  firmware-bnx2              <none>
pn  firmware-bnx2x             <none>
pn  firmware-brcm80211         <none>
pn  firmware-cavium            <none>
pn  firmware-cirrus            <none>
pn  firmware-intel-graphics    <none>
pn  firmware-intel-misc        <none>
pn  firmware-intel-sound       <none>
pn  firmware-ipw2x00           <none>
pn  firmware-ivtv              <none>
pn  firmware-iwlwifi           <none>
pn  firmware-libertas          <none>
pn  firmware-marvell-prestera  <none>
pn  firmware-mediatek          <none>
pn  firmware-misc-nonfree      <none>
pn  firmware-myricom           <none>
pn  firmware-netronome         <none>
pn  firmware-netxen            <none>
pn  firmware-nvidia-graphics   <none>
pn  firmware-qcom-soc          <none>
pn  firmware-qlogic            <none>
pn  firmware-realtek           <none>
pn  firmware-samsung           <none>
pn  firmware-siano             <none>
pn  firmware-ti-connectivity   <none>
pn  xen-hypervisor             <none>

-- no debconf information