ppc: linux-image-6.1.0-23-powerpc64le BUG: Kernel NULL pointer dereference on read at 0x00000000

Hello

I have upgraded one of my bookworm PPC system from linux-image-6.1.0-21-powerpc64le to linux-image-6.1.0-23-powerpc64le
This is a 8335-GCA POWER8 machine.
With this new kernel I got the following crash:
    8.164930] Kernel attempted to read user page (0) - exploit attempt? (uid: 0)
[    8.165165] BUG: Kernel NULL pointer dereference on read at 0x00000000
[    8.165187] Faulting instruction address: 0xc0000000000c367c
[    8.165209] Oops: Kernel access of bad area, sig: 11 [#1]
[    8.165228] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
[    8.165252] Modules linked in: powernv_rng(+) syscopyarea sysfillrect sysimgblt ofpart usbhid fb_sys_fops uas powernv_flash i2c_algo_bit hid usb_storage xts mtd ecb sg ctr opal_prd at24(+) vmx_crypto ipmi_powernv gf128mul regmap_i2c ipmi_devintf ipmi_msghandler nvidia(PO) nfsd auth_rpcgss nfs_acl lockd grace sunrpc drm loop drm_panel_orientation_quirks fuse configfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic dm_mod sd_mod t10_pi xhci_pci crc64_rocksoft crc64 crc_t10dif crct10dif_generic crct10dif_common xhci_hcd crc32c_vpmsum tg3 usbcore ahci libahci libphy usb_common
[    8.165586] CPU: 7 PID: 1396 Comm: (udev-worker) Tainted: P           O       6.1.0-23-powerpc64le #1  Debian 6.1.99-1
[    8.165618] Hardware name: 8335-GCA POWER8 (raw) 0x4d0200 opal:skiboot-5.4.8-5787ad3 PowerNV
[    8.165644] NIP:  c0000000000c367c LR: c00800000a860110 CTR: c0000000000c3650
[    8.165668] REGS: c0000000440272e0 TRAP: 0300   Tainted: P           O        (6.1.0-23-powerpc64le Debian 6.1.99-1)
[    8.165699] MSR:  900000000280b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  CR: 44222882  XER: 00000000
[    8.165754] CFAR: c00800000a860244 DAR: 0000000000000000 DSISR: 40000000 IRQMASK: 0 
               GPR00: c00800000a860110 c000000044027580 c00000000113cd00 c000000014dece00 
               GPR04: c000000014dece00 0000000000000020 0000000000000000 c000000042e80000 
               GPR08: 0000000000000000 c000000002121ff8 0000000000000000 c00800000a860230 
               GPR12: c0000000000c3650 c000000fffffa200 0000000000000020 0000000022000000 
               GPR16: 0000000000000000 0000000000000000 0000000000000009 0000000137f4f618 
               GPR20: 0000000000000000 0000010022a52a00 0000000000000000 0000000000000005 
               GPR24: 0000010022afd250 0000010022a52a00 c00000000285e6fc c000000000f9e060 
               GPR28: 0000000000000003 0000000000000004 0000000000000003 c000000014dece08 
[    8.166142] NIP [c0000000000c367c] pnv_get_random_long+0x2c/0xd0
[    8.166173] LR [c00800000a860110] powernv_rng_read+0x78/0xc4 [powernv_rng]
[    8.166206] Call Trace:
[    8.166217] [c000000044027580] [c0000000440275c0] 0xc0000000440275c0 (unreliable)
[    8.166247] [c0000000440275c0] [c000000000919ad8] add_early_randomness+0x88/0x150
[    8.166420] [c000000044027600] [c00000000091a114] hwrng_register+0x344/0x420
[    8.166451] [c000000044027660] [c00000000091a258] devm_hwrng_register+0x68/0xf0
[    8.166484] [c0000000440276a0] [c00800000a86003c] powernv_rng_probe+0x34/0x90 [powernv_rng]
[    8.166519] [c000000044027710] [c000000000948078] platform_probe+0x78/0x110
[    8.166545] [c000000044027790] [c000000000943138] really_probe+0x108/0x590
[    8.166573] [c000000044027820] [c000000000943674] __driver_probe_device+0xb4/0x230
[    8.166602] [c0000000440278a0] [c000000000943844] driver_probe_device+0x54/0x130
[    8.166631] [c0000000440278e0] [c000000000944538] __driver_attach+0x158/0x2b0
[    8.168198] [c000000044027960] [c00000000093f5c4] bus_for_each_dev+0xb4/0x140
[    8.168216] [c0000000440279c0] [c000000000942594] driver_attach+0x34/0x50
[    8.168231] [c0000000440279e0] [c000000000941be8] bus_add_driver+0x218/0x300
[    8.168248] [c000000044027a70] [c0000000009459e4] driver_register+0xb4/0x1c0
[    8.168266] [c000000044027ae0] [c0000000009479f8] __platform_driver_register+0x38/0x50
[    8.168284] [c000000044027b00] [c00800000a86018c] powernv_rng_driver_init+0x30/0x4c [powernv_rng]
[    8.168303] [c000000044027b20] [c0000000000121b0] do_one_initcall+0x80/0x320
[    8.168321] [c000000044027c00] [c000000000218dac] do_init_module+0x6c/0x290
[    8.168336] [c000000044027c80] [c00000000021c608] __do_sys_finit_module+0xd8/0x190
[    8.168353] [c000000044027db0] [c00000000002b028] system_call_exception+0x138/0x260
[    8.168371] [c000000044027e10] [c00000000000c654] system_call_common+0xf4/0x258
[    8.168390] --- interrupt: c00 at 0x7fff9040a964
[    8.168401] NIP:  00007fff9040a964 LR: 00007fff90680500 CTR: 0000000000000000
[    8.168545] REGS: c000000044027e80 TRAP: 0c00   Tainted: P           O        (6.1.0-23-powerpc64le Debian 6.1.99-1)
[    8.168564] MSR:  900000000280f033 <SF,HV,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE>  CR: 24222248  XER: 00000000
[    8.168591] IRQMASK: 0 
               GPR00: 0000000000000161 00007ffff966e760 00007fff90516f00 0000000000000006 
               GPR04: 00007fff9068be88 0000000000000000 0000000000000006 0000000000000000 
               GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
               GPR12: 0000000000000000 00007fff9076e220 0000000000000020 0000000022000000 
               GPR16: 0000000000000000 0000000000000000 0000000000000009 0000000137f4f618 
               GPR20: 0000000000000000 0000010022a52a00 0000000000000000 0000000000000005 
               GPR24: 0000010022afd250 0000010022a52a00 0000000022000000 0000010022b14b20 
               GPR28: 00007fff9068be88 0000000000020000 0000000000000000 0000010022a52a00 
[    8.169729] NIP [00007fff9040a964] 0x7fff9040a964
[    8.169740] LR [00007fff90680500] 0x7fff90680500
[    8.169751] --- interrupt: c00
[    8.169760] Instruction dump:
[    8.169769] 60420000 3c4c0108 384296b0 7c0802a6 60000000 7d2000a6 71290010 41820078 
[    8.169791] e94d0030 3d2200fe 392952f8 7d4a482a <e92a0000> 7c0004ac e9090000 0c080000 
[    8.169813] ---[ end trace 0000000000000000 ]---

Regards