[Bug]: Kernel 6.12.43 - WARNING: CPU: 0 PID: 434 at kernel/rcu/tree_plugin.h:761

[octopusnz]

Version

7.2.2

Host OS Type

Windows

Host OS name + version

Windows 10 22H2

Host Architecture

x86

Guest OS Type

Linux

Guest Architecture

x86

Guest OS name + version

Debian Linux 13.1

Component

Other

What happened?

Using Debian Kernel 6.12.43 and 7.2.2 guest extensions the following warning appears at boot.

uname -a
Linux debian 6.12.43+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.43-1 (2025-08-27) x86_64 GNU/Linux

Appreciate it is only a warning, but logging in case it is useful to increase compatibility with this series of kernels.

[    5.409302] WARNING: CPU: 0 PID: 434 at kernel/rcu/tree_plugin.h:761 rcu_sched_clock_irq+0x7cb/0xb60
[    5.409315] Modules linked in: intel_uncore_frequency(-) intel_uncore_frequency_common intel_pmc_core intel_vsec pmt_telemetry pmt_class crct10dif_pclmul ghash_clmulni_intel sha512_ssse3 sha256_ssse3 sha1_ssse3 aesni_intel gf128mul crypto_simd cryptd rapl snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm joydev snd_timer snd pcspkr soundcore vboxguest(OE) ac sg evdev msr parport_pc ppdev lp parport efi_pstore configfs nfnetlink ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic hid_generic usbhid vmwgfx hid sd_mod sr_mod drm_ttm_helper cdrom ttm ahci ata_generic drm_kms_helper xhci_pci libahci ata_piix xhci_hcd libata video crc32_pclmul drm psmouse usbcore wmi virtio_net crc32c_intel scsi_mod serio_raw net_failover i2c_piix4 failover i2c_smbus usb_common scsi_common button
[    5.409479] CPU: 0 UID: 0 PID: 434 Comm: (udev-worker) Tainted: G           OE      6.12.43+deb13-amd64 #1  Debian 6.12.43-1
[    5.409487] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[    5.409490] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[    5.409493] RIP: 0010:rcu_sched_clock_irq+0x7cb/0xb60
[    5.409501] Code: 84 c0 0f 85 e3 fd ff ff 49 8b 45 08 49 39 87 00 6f 03 00 0f 85 12 fc ff ff 0f b6 45 14 84 c0 0f 84 cb fd ff ff e9 01 fc ff ff <0f> 0b e9 ca f8 ff ff 4c 89 54 24 08 48 89 14 24 e8 20 ee fe ff 48
[    5.409505] RSP: 0000:ffffab600076fd38 EFLAGS: 00010086
[    5.409510] RAX: 00000000ffffffff RBX: ffff99ff49993300 RCX: 0000000000000000
[    5.409514] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
[    5.409517] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
[    5.409520] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
[    5.409523] R13: 0000000000000002 R14: ffff9a0057a26418 R15: ffff9a0057a25e80
[    5.409526] FS:  00007febf3e3e980(0000) GS:ffff9a0057a00000(0000) knlGS:0000000000000000
[    5.409531] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.409534] CR2: 00007f52329820ac CR3: 0000000102488002 CR4: 00000000000706f0
[    5.409565] Call Trace:
[    5.409577]  <TASK>
[    5.409582]  ? filename_lookup+0xde/0x1d0
[    5.409591]  ? xas_load+0xd/0xd0
[    5.409596]  ? xa_load+0x7b/0xb0
[    5.409604]  update_process_times+0x70/0xb0
[    5.409612]  tick_nohz_handler+0x8f/0x140
[    5.409620]  ? __pfx_tick_nohz_handler+0x10/0x10
[    5.409626]  __hrtimer_run_queues+0x132/0x2a0
[    5.409635]  hrtimer_interrupt+0xfa/0x210
[    5.409643]  __sysvec_apic_timer_interrupt+0x55/0x100
[    5.409649]  sysvec_apic_timer_interrupt+0x38/0x90
[    5.409656]  asm_sysvec_apic_timer_interrupt+0x1a/0x20
[    5.409664] RIP: 0033:0x7febf397263b
[    5.409676] Code: d0 c5 ed df c9 c5 fd d7 c9 41 8d 41 20 48 39 c2 76 2d 48 01 fa ff c1 0f 84 c8 fc ff ff 66 90 f3 0f bc c9 44 01 c9 0f b6 04 0f <0f> b6 0c 0e 29 c8 44 31 c0 44 29 c0 c5 f8 77 c3 0f 1f 44 00 00 ff
[    5.409680] RSP: 002b:00007ffd3d4f3748 EFLAGS: 00000202
[    5.409684] RAX: 0000000000000070 RBX: 000055eaddae5fdd RCX: 0000000000000000
[    5.409688] RDX: 0000000000000002 RSI: 00007febf3d23d04 RDI: 000055eaddae5fdd
[    5.409691] RBP: 00007febf3d23d04 R08: 0000000000000000 R09: 0000000000000000
[    5.409694] R10: 0000000000001000 R11: 0000000000000202 R12: 0000000000000002
[    5.409697] R13: 0000000000000001 R14: 0000000000000070 R15: 00007ffd3d4f3870
[    5.409705]  </TASK>
[    5.409707] ---[ end trace 0000000000000000 ]---

How can we reproduce this?

Install Host and Guest as per above with kernel version and modules loaded as per above.
sudo dmesg | grep WARNING

Attached log files.

VBox20250916.log
VBoxHardening20250916.log

Did you upload all of your necessary log files, screenshots, etc.?

• Yes, I've uploaded all pertinent files to this issue.