Unhandled fault: page domain fault (0x81b) at 0x00465000 when starting pihole-FTL on recent kernel

All,

This week I upgraded my PogoPlug Pro to Debian Bullseye. The plug is running pi-hole which has been running fine for more than a year now. This was on kernel linux-4.14.198-oxnas-tld-1. Bullseye is running the same kernel and pi-hole runs fine as well.
Today I decided to upgrade to the most recent kernel I can find here (linux-5.4.224-oxnas-tld-1). Everything works but pihole-FTL fails with the following error at startup:

root@pogo01:/# /etc/init.d/pihole-FTL start
Not running

[  103.153164][ T1224] 8<--- cut here ---
[  103.156915][ T1224] Unhandled fault: page domain fault (0x81b) at 0x00465000
[  103.163927][ T1224] pgd = f9cf97d2
[  103.167308][ T1224] [00465000] *pgd=661c0831, *pte=63ae859f, *ppte=63ae8e6e
[  103.174243][ T1224] Internal error: : 81b [#1] PREEMPT SMP ARM
[  103.180042][ T1224] Modules linked in: rt2800pci rt2800mmio rt2800lib rt2x00pci rt2x00mmio rt2x00lib mac80211 cfg80211 rfkill dwmac_generic uas
[  103.192875][ T1224] CPU: 0 PID: 1224 Comm: pihole-FTL Not tainted 5.4.210-oxnas-tld-1 #1.0
[  103.201093][ T1224] Hardware name: Generic DT based system
[  103.206561][ T1224] PC is at v6_coherent_kern_range+0x4/0x2c
[  103.212195][ T1224] LR is at arm_syscall+0x188/0x3b4
[  103.217131][ T1224] pc : [<c010e6b0>]    lr : [<c010635c>]    psr: 60000013
[  103.224056][ T1224] sp : c61aff90  ip : 00000000  fp : bebdfb1c
[  103.229944][ T1224] r10: 00000000  r9 : c61ae000  r8 : c01011e4
[  103.235832][ T1224] r7 : 00466000  r6 : 00760000  r5 : c61ae000  r4 : 00000002
[  103.243018][ T1224] r3 : 00001000  r2 : c7189c00  r1 : 00466000  r0 : 00465000
[  103.250201][ T1224] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[  103.257991][ T1224] Control: 00c5787d  Table: 6617400a  DAC: 00000051
[  103.264396][ T1224] Process pihole-FTL (pid: 1224, stack limit = 0x2d7865ad)
[  103.271408][ T1224] Stack: (0xc61aff90 to 0xc61b0000)
[  103.276436][ T1224] ff80:                                     bebdfa70 00000000 00000000 000f0002
[  103.285271][ T1224] ffa0: c01011e4 c0101000 bebdfa70 00000000 00465000 00760000 00000000 00000014
[  103.294105][ T1224] ffc0: bebdfa70 00000000 00000000 000f0002 00000016 b6d8baac b6fcd9b8 bebdfb1c
[  103.302940][ T1224] ffe0: 00000000 bebdfa60 b6fa8fbc b6fa8fd4 60000010 00465000 00000000 00000000
[  103.311779][ T1224] [<c010e6b0>] (v6_coherent_kern_range) from [<c010635c>] (arm_syscall+0x188/0x3b4)
[  103.320957][ T1224] [<c010635c>] (arm_syscall) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
[  103.329351][ T1224] Exception stack(0xc61affa8 to 0xc61afff0)
[  103.335073][ T1224] ffa0:                   bebdfa70 00000000 00465000 00760000 00000000 00000014
[  103.343905][ T1224] ffc0: bebdfa70 00000000 00000000 000f0002 00000016 b6d8baac b6fcd9b8 bebdfb1c
[  103.352734][ T1224] ffe0: 00000000 bebdfa60 b6fa8fbc b6fa8fd4
[  103.358458][ T1224] Code: ee070f15 e12fff1e e12fff1e e3c0001f (ee070f3a)
[  103.365217][ T1224] ---[ end trace 85d702e36acf4e5d ]---
Segmentation fault

Not sure who to ask for help on this subject, here? or the pihole people?, because this could be a kernel (?) issue.

Anyway, I would appreciate any thoughts on this.
Many thanks in advance ... and happy new year ;)

kennywest,

I think you should try pihole community (and of course users here who use pihole), to see which kernel versions people have reported running, and whether a segfault was seen lately.

-bodhi
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bodhi's corner

Thank you for your reply. I asked the pi-hole community for help ... let's see if we can find a solution. In the meantime I reverted to the 4.14.198 kernel which seems to work without any problems.