Dear Maintainer,

after upgrade to kernel 7.1 rc4



[    5.985746] device-mapper: uevent: version 1.0.3
[    5.985799] device-mapper: ioctl: 4.50.0-ioctl (2025-04-28) initialised: dm-devel@lists.linux.dev
[    5.986809] nct6775: Found NCT6798D or compatible chip at 0x2e:0x290
[    5.991540] systemd[1]: Finished keyboard-setup.service - Set the console keyboard layout.
[    5.995609] systemd[1]: Finished systemd-modules-load.service - Load Kernel Modules.
[    5.996113] systemd[1]: Starting systemd-sysctl.service - Apply Kernel Variables...
[    5.996747] EXT4-fs (nvme1n1p2): re-mounted 3a5fea2c-a289-49c1-91c5-acb6c5f07c02 r/w.
[    5.997128] systemd[1]: Finished systemd-remount-fs.service - Remount Root and Kernel File Systems.
[    5.997576] systemd[1]: Activating swap swapfile.swap - /swapfile...
[    5.997652] systemd[1]: systemd-hwdb-update.service - Rebuild Hardware Database skipped, unmet condition check ConditionNeedsUpdate=/etc
[    5.997676] systemd[1]: systemd-pstore.service - Platform Persistent Storage Archival skipped, unmet condition check ConditionDirectoryNotEmpty=/sys/fs/pstore
[    5.998061] systemd[1]: Starting systemd-random-seed.service - Load/Save OS Random Seed...
[    5.998082] systemd[1]: systemd-sysusers.service - Create System Users skipped, no trigger condition checks were met.
[    5.998840] systemd[1]: Starting systemd-journalctl.socket - Journal Log Access Socket...
[    5.999256] systemd[1]: Starting systemd-tmpfiles-setup-dev.service - Create Static Device Nodes in /dev...
[    5.999269] systemd[1]: systemd-tpm2-setup.service - TPM SRK Setup skipped, unmet condition check ConditionSecurity=measured-uki
[    5.999282] systemd[1]: systemd-pcrnvdone.service - TPM PCR NvPCR Initialization Separator skipped, unmet condition check ConditionSecurity=measured-uki
[    5.999520] systemd[1]: Listening on systemd-journalctl.socket - Journal Log Access Socket.
[    6.000895] systemd[1]: Finished systemd-sysctl.service - Apply Kernel Variables.
[    6.001684] Adding 16777212k swap on /swapfile.  Priority:-1 extents:811 across:731414528k SS
[    6.001716] systemd[1]: Activated swap swapfile.swap - /swapfile.
[    6.001743] systemd[1]: Reached target swap.target - Swaps.
[    6.002090] systemd[1]: Finished systemd-random-seed.service - Load/Save OS Random Seed.
[    6.004570] systemd[1]: Finished systemd-tmpfiles-setup-dev.service - Create Static Device Nodes in /dev.
[    6.005177] systemd[1]: Starting systemd-udevd.service - Rule-based Manager for Device Events and Files...
[    6.016597]  slab kernfs_node_cache start ffff8946401ea770 pointer offset 120 size 136
[    6.016602] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    6.016604] #PF: supervisor instruction fetch in kernel mode
[    6.016605] #PF: error_code(0x0010) - not-present page
[    6.016606] PGD 0 P4D 0
[    6.016607] Oops: Oops: 0010 [#1] SMP NOPTI
[    6.016609] CPU: 14 UID: 0 PID: 0 Comm: swapper/14 Tainted: G        W           7.1-amd64 #1 PREEMPT(lazy)  Debian 7.1~rc4-1~exp1
[    6.016611] Tainted: [W]=WARN
[    6.016612] Hardware name: To Be Filled By O.E.M. W480M WS/W480M WS, BIOS P2.40 06/27/2024
[    6.016613] RIP: 0010:0x0
[    6.016618] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
[    6.016619] RSP: 0018:ffffd155c0490ee0 EFLAGS: 00010282
[    6.016620] RAX: 0000000000000001 RBX: 000000000000001d RCX: 0000000000000001
[    6.016621] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8946401ea7e8
[    6.016622] RBP: ffff8955207b3300 R08: 0000000000000000 R09: ffffd155c0490c28
[    6.016623] R10: ffffffffba0f0a70 R11: 3fffffffffffefff R12: ffffd155c0490f10
[    6.016623] R13: ffff8946014d2240 R14: 000000000000001c R15: 0000000000000000
[    6.016624] FS:  0000000000000000(0000) GS:ffff895565af2000(0000) knlGS:0000000000000000
[    6.016625] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.016626] CR2: ffffffffffffffd6 CR3: 000000010560e003 CR4: 0000000000770ef0
[    6.016627] PKRU: 55555554
[    6.016628] Call Trace:
[    6.016629]  <IRQ>
[    6.016630]  rcu_do_batch+0x1b3/0x4f0
[    6.016634]  rcu_core+0x131/0x2d0
[    6.016636]  handle_softirqs+0xd8/0x330
[    6.016638]  ? clockevents_program_event+0x6f/0x1e0
[    6.016641]  __irq_exit_rcu+0x9e/0xf0
[    6.016643]  sysvec_apic_timer_interrupt+0x71/0x90
[    6.016646]  </IRQ>
[    6.016646]  <TASK>
[    6.016647]  asm_sysvec_apic_timer_interrupt+0x1a/0x20
[    6.016649] RIP: 0010:mwait_idle+0x41/0x50
[    6.016651] Code: 2d 4a 00 07 00 f0 80 0e 40 48 8b 06 a8 10 75 20 48 89 f0 0f 1f 00 31 c9 89 ca 0f 01 c8 48 8b 06 a8 10 75 0c 89 c8 fb 0f 01 c9 <fa> 0f 1f 44 00 00 f0 80 26 bf c3 cc cc cc cc 90 90 90 90 90 90 90
[    6.016652] RSP: 0018:ffffd155c01abeb0 EFLAGS: 00000246
[    6.016653] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[    6.016654] RDX: 0000000000000000 RSI: ffff8946014d2240 RDI: 000000000006dd44
[    6.016654] RBP: ffff8946014d2240 R08: ffffffe9df71bfaf R09: 0000000000000001
[    6.016655] R10: 0000001786d73558 R11: 0000000000000000 R12: 000000000000000e
[    6.016656] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[    6.016657]  default_idle_call+0x2f/0x120
[    6.016658]  do_idle+0x27a/0x2b0
[    6.016661]  cpu_startup_entry+0x29/0x30
[    6.016662]  start_secondary+0x126/0x180
[    6.016665]  common_startup_64+0x13e/0x141
[    6.016668]  </TASK>
[    6.016668] Modules linked in: nct6775 dm_mod parport_pc lp ppdev nct6775_core parport i2c_dev jc42 hwmon_vid coretemp msr nvme_fabrics efi_pstore nfnetlink autofs4 ext4 crc16 mbcache jbd2 crc32c_cryptoapi btrfs libblake2b sr_mod cdrom raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx raid6_pq xor raid1 raid0 md_mod zstd usb_storage hid_logitech_hidpp hid_logitech_dj hid_generic usbhid hid xe intel_vsec drm_gpuvm configfs drm_gpusvm_helper gpu_sched drm_ttm_helper drm_exec drm_suballoc_helper sd_mod i915 drm_buddy ttm drm_display_helper cec rc_core drm_client_lib drm_kms_helper ahci libahci xhci_pci mpt3sas drm xhci_hcd libata iTCO_wdt nvme atlantic intel_pmc_bxt raid_class igb scsi_transport_sas nvme_core watchdog usbcore mxm_wmi macsec scsi_mod nvme_keyring video i2c_algo_bit i2c_i801 nvme_auth dca i2c_smbus wmi button usb_common scsi_common efivarfs
[    6.016703] CR2: 0000000000000000
[    6.016705] ---[ end trace 0000000000000000 ]---
[    6.069188] RIP: 0010:0x0
[    6.069194] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
[    6.069195] RSP: 0018:ffffd155c0490ee0 EFLAGS: 00010282
[    6.069196] RAX: 0000000000000001 RBX: 000000000000001d RCX: 0000000000000001
[    6.069197] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8946401ea7e8
[    6.069198] RBP: ffff8955207b3300 R08: 0000000000000000 R09: ffffd155c0490c28
[    6.069199] R10: ffffffffba0f0a70 R11: 3fffffffffffefff R12: ffffd155c0490f10
[    6.069200] R13: ffff8946014d2240 R14: 000000000000001c R15: 0000000000000000
[    6.069201] FS:  0000000000000000(0000) GS:ffff895565af2000(0000) knlGS:0000000000000000
[    6.069202] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.069203] CR2: ffffffffffffffd6 CR3: 000000010560e003 CR4: 0000000000770ef0
[    6.069204] PKRU: 55555554
[    6.069204] Kernel panic - not syncing: Fatal exception in interrupt
[    6.069233] Kernel Offset: 0x37000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

Hi,

This might be another instance of #1124075, but I'm not merging them
yet. Ben?

Regards,
Salvatore

Control: tag -1 moreinfo
[...]

It does look similar, although there isn't anything in the log
definitely connecting the crash to the parport subsystem.

Jennifer - did this only happen once, or does it happen every time (or
very often) when you try to boot this version?

If it happens often, does adding "blacklist=parport_pc" to the kernel
command line fix the problem?

Ben.

It would crash every boot after upgrading from rc3 to rc4, although the log
I reported was the only time it showed a QR kernel panic. I was able to
boot to desktop once but the system immediately clicked off once desktop
was reached.

I will test "blacklist=parport_pc" in the next day or so when I have the
time.

RC5 seemed to have resolved the issue I was having, I was unable to test
with RC4 due to uninstalling it after the panic and not being able to test
till today. Booting rc5 with and without the blacklist for parport_pc does
not result in a panic.

Version: 7.1~rc5-1~exp1
[...]

Thanks for reporting back.  I'm closing this report with this version,
even though it's not clear exactly where the bug was.

Ben.