Greetings! Getting this every time at boot on my Thinkpad T60 with kernel 6.4.x series when DEBUG_PAGEALLOC_ENABLE_DEFAULT is set. Same kernel .config without debug pagealloc boots just fine. Also happens on latest 6.5-rc3: [...] BUG: unable to handle page fault for address: c4cd77c8 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page *pdpt = 0000000002a3b001 *pde = 0000000005378063 *pte = 800ffffffb328062 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC PTI CPU: 1 PID: 1 Comm: systemd Not tainted 6.5.0-rc3-P3 #2 Hardware name: LENOVO 2007F2G/2007F2G, BIOS 79ETE7WW (2.27 ) 03/21/2011 EIP: do_one_initcall+0x12/0x284 Code: 12 00 64 ff 0d a4 8d ce c4 e8 82 03 00 00 5d 31 c0 31 c9 31 d2 c3 90 90 55 89 e5 53 57 56 81 ec d4 02 00 00 89 85 20 fd ff ff c8 77 cd c4 89 45 f0 64 8b 3d a4 8d ce c4 8d 85 24 fd ff ff ba EAX: f7e21000 EBX: f7e8a2e0 ECX: 00000000 EDX: 00000000 ESI: f7e8a2e0 EDI: c1033c40 EBP: c111bdb8 ESP: c111bad8 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00210286 CR0: 80050033 CR2: c4cd77c8 CR3: 02260000 CR4: 000006f0 Call Trace: ? show_regs+0x4e/0x5c ? __die_body+0x11/0x4c ? __die+0x21/0x30 ? page_fault_oops+0x22c/0x25c ? kernelmode_fixup_or_oops+0x92/0xa8 ? __bad_area_nosemaphore+0x4f/0x1b0 ? bad_area_nosemaphore+0xd/0x14 ? do_kern_addr_fault+0x2e/0x50 ? doublefault_shim+0x104/0x104 ? exc_page_fault+0x2e4/0x48c ? doublefault_shim+0x104/0x104 ? handle_exception+0x101/0x101 ? 0xf7e21000 ? doublefault_shim+0x104/0x104 ? do_one_initcall+0x12/0x284 ? doublefault_shim+0x104/0x104 ? do_one_initcall+0x12/0x284 ? 0xf7e21000 ? __lock_acquire+0xbcf/0x255c ? slab_err+0xa0/0xac ? __lock_acquire+0xbcf/0x255c ? __lock_acquire+0xbcf/0x255c ? node_tag_clear+0x8c/0x8c ? __lock_acquire+0xbcf/0x255c ? check_bytes_and_report+0x2a/0xe8 ? find_held_lock+0x30/0x98 ? trace_hardirqs_on+0x4b/0x88 ? ___slab_alloc+0x8c7/0x974 ? __kmem_cache_alloc_node+0x199/0x27c ? __kmem_cache_free+0x28b/0x294 ? vfree+0x88/0xbc ? do_init_module+0x1c/0x1a0 ? kmalloc_trace+0x20/0xa4 ? kmalloc_trace+0x43/0xa4 do_init_module+0x50/0x1a0 load_module+0xc5f/0xe9c __ia32_sys_finit_module+0x18c/0x240 __do_fast_syscall_32+0xae/0xd8 ? syscall_exit_to_user_mode+0x6b/0x160 ? __do_fast_syscall_32+0xba/0xd8 ? syscall_exit_to_user_mode+0x6b/0x160 ? __do_fast_syscall_32+0xba/0xd8 ? irqentry_exit+0x31/0x74 ? exc_page_fault+0x141/0x48c do_fast_syscall_32+0x29/0x5c do_SYSENTER_32+0x12/0x18 entry_SYSENTER_32+0x98/0xf1 EIP: 0xb7f1a539 Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 0f 1f 00 58 b8 77 00 00 00 cd 80 90 0f 1f EAX: ffffffda EBX: 00000004 ECX: b7d21af1 EDX: 00000000 ESI: b7d0dd00 EDI: b7d17fbf EBP: 00000000 ESP: bfbcfb3c DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00200292 Modules linked in: dmi_sysfs(+) CR2: 00000000c4cd77c8 ---[ end trace 0000000000000000 ]--- EIP: do_one_initcall+0x12/0x284 Code: 12 00 64 ff 0d a4 8d ce c4 e8 82 03 00 00 5d 31 c0 31 c9 31 d2 c3 90 90 55 89 e5 53 57 56 81 ec d4 02 00 00 89 85 20 fd ff ff c8 77 cd c4 89 45 f0 64 8b 3d a4 8d ce c4 8d 85 24 fd ff ff ba EAX: f7e21000 EBX: f7e8a2e0 ECX: 00000000 EDX: 00000000 ESI: f7e8a2e0 EDI: c1033c40 EBP: c111bdb8 ESP: c111bad8 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00210286 CR0: 80050033 CR2: c4cd77c8 CR3: 02260000 CR4: 000006f0 note: systemd[1] exited with irqs disabled Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 Kernel Offset: disabled Rebooting in 40 seconds.. Some data about the hardware: # inxi -bZ System: Kernel: 6.4.6-gentoo-P3 arch: i686 bits: 32 Desktop: Xfce v: 4.18.1 Distro: Gentoo Base System release 2.13 Machine: Type: Laptop System: LENOVO product: 2007F2G v: ThinkPad T60 serial: Mobo: LENOVO model: 2007F2G serial: BIOS: LENOVO v: 79ETE7WW (2.27 ) date: 03/21/2011 Battery: ID-1: BAT0 charge: 29.2 Wh (90.1%) condition: 32.4/56.2 Wh (57.7%) CPU: Info: dual core Intel T2400 [MCP] speed (MHz): avg: 1000 min/max: 1000/1833 Graphics: Device-1: AMD RV515/M52 [Mobility Radeon X1300] driver: radeon v: kernel Display: x11 server: X.org v: 1.21.1.8 driver: X: loaded: radeon unloaded: fbdev,modesetting dri: r300 gpu: radeon resolution: resolution: 1024x768 API: OpenGL v: 2.1 Mesa 23.1.3 renderer: ATI RV515 Network: Device-1: Intel 82573L Gigabit Ethernet driver: e1000e Device-2: Intel PRO/Wireless 3945ABG [Golan] Network driver: iwl3945 # lspci 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03) 00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express PCI Express Root Port (rev 03) 00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 1 (rev 02) 00:1c.1 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 2 (rev 02) 00:1c.2 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 3 (rev 02) 00:1c.3 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 4 (rev 02) 00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 (rev 02) 00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 (rev 02) 00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 (rev 02) 00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 (rev 02) 00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2) 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02) 00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [AHCI mode] (rev 02) 00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 02) 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV515/M52 [Mobility Radeon X1300] 02:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Controller 03:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02) 15:00.0 CardBus bridge: Texas Instruments PCI1510 PC card Cardbus Controller Regards, Erhard