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For some weird reason my kernel does not recongnize the nokaslr cmdline >>>> parameter, so I build a kernel without CONFIG_RANDOMIZE_BASE and this does NOT >>>> fix the issue. >> >> Can you clarify if you're booting with the compressed image bzImage/vmlinuz or >> with vmlinux? > > I'm booting vmlinuz images (the kernel is compile via make -j16 bindeb-pkg which > gives debian packages which I install with dpkg). Thanks > >>>> 4. Most surprisingly removing CONFIG_PCI_P2PDMA also does NOT fix the issue. >>>> >> >> >>> >>> I've done more experimenting regarding 4.: >>> next-20250307 with "CONFIG_RANDOMIZE_BASE=y" AND "CONFIG_PCI_P2PDMA is not set" >>> works as expected (i.e. no input lag when stellaris is running) >>> >>> next-20250307 with "CONFIG_RANDOMIZE_BASE is not set" AND "CONFIG_PCI_P2PDMA is >>> not set" also shows the buggy behaviour (i.e. input lag when stellaris is >>> running) (this was the configuration I tested before) >> >> This is an interesting experiment, I am beginning to wonder if the system relies >> on a reduced direct map for the game to work correctly. Can you also check in this >> scenario if CONFIG_RANDOMIZE_MEMORY is disabled? >> > I'm on it. > >> Can you please share the dmesg >> 1. output before and after the changes? >> 2. Do you see any warnings/errors in journalctl or game specific log files? >> 3. lspci -vvv output before and after the changes? >> > > My dmesg shows a warning, but this is seems to be unrelated (it's present in > both the working and non-working case and also in 6.12.17). I have not bisected > this, yet. I also tried CONFIG_LOCKDEP=y in next-20250307 (with and without the > revert) and got a warning about a possible deadlock in Networkmanager in both > cases (also not bisected, yet) > > [ 11.241282] [ T1751] WARNING: CPU: 14 PID: 1751 at mm/util.c:674 > __kvmalloc_node_noprof+0xa2/0xb0 > [ 11.241289] [ T1751] Modules linked in: snd_seq_dummy snd_hrtimer > snd_seq_midi snd_seq_midi_event snd_seq rfcomm bnep nls_ascii nls_cp437 vfat fat > snd_ctl_led snd_hda_codec_realtek snd_hda_codec_generic snd_hda_scodec_component > btusb snd_hda_codec_hdmi btrtl btintel btbcm btmtk snd_hda_intel snd_usb_audio > snd_intel_dspcfg uvcvideo snd_acp3x_pdm_dma snd_soc_dmic snd_acp3x_rn > snd_usbmidi_lib snd_hda_codec videobuf2_vmalloc snd_ump videobuf2_memops uvc > bluetooth snd_soc_core videobuf2_v4l2 snd_hwdep snd_hda_core snd_rawmidi > videodev snd_seq_device snd_pcm_oss snd_mixer_oss snd_rn_pci_acp3x snd_pcm > snd_acp_config videobuf2_common msi_wmi snd_soc_acpi ecdh_generic ecc mc > sparse_keymap edac_mce_amd snd_timer wmi_bmof k10temp snd snd_pci_acp3x ccp > soundcore ac battery button joydev hid_sensor_als hid_sensor_gyro_3d > hid_sensor_prox hid_sensor_accel_3d hid_sensor_magn_3d hid_sensor_trigger > amd_pmc industrialio_triggered_buffer kfifo_buf industrialio evdev > hid_sensor_iio_common mt7921e mt7921_common mt792x_lib mt76_connac_lib mt76 > [ 11.241354] [ T1751] mac80211 libarc4 cfg80211 rfkill msr fuse > nvme_fabrics efi_pstore configfs efivarfs autofs4 ext4 mbcache jbd2 amdgpu > usbhid amdxcp i2c_algo_bit drm_client_lib drm_ttm_helper ttm drm_exec gpu_sched > xhci_pci drm_suballoc_helper drm_panel_backlight_quirks xhci_hcd cec > hid_sensor_hub hid_multitouch mfd_core drm_buddy hid_generic drm_display_helper > usbcore i2c_hid_acpi psmouse nvme amd_sfh i2c_hid drm_kms_helper serio_raw hid > nvme_core r8169 i2c_piix4 usb_common i2c_smbus crc16 i2c_designware_platform > i2c_designware_core > [ 11.241391] [ T1751] CPU: 14 UID: 1000 PID: 1751 Comm: gst-plugin-scan Not > tainted 6.14.0-rc6-nop2pdma #559 > [ 11.241394] [ T1751] Hardware name: Micro-Star International Co., Ltd. > Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.107 11/10/2021 > [ 11.241396] [ T1751] RIP: 0010:__kvmalloc_node_noprof+0xa2/0xb0 > [ 11.241400] [ T1751] Code: 00 49 b9 63 01 00 00 00 00 00 80 68 00 04 00 00 > 4c 23 0d 79 0d ea 00 48 01 d1 e8 c9 af 03 00 48 83 c4 18 eb 9a 80 e7 20 75 95 > <0f> 0b eb 91 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 > [ 11.241402] [ T1751] RSP: 0018:ffffa32dc63abcc0 EFLAGS: 00010246 > [ 11.241403] [ T1751] RAX: 0000000000000000 RBX: 00000000000000c0 RCX: > 0000000000000000 > [ 11.241405] [ T1751] RDX: 0000000000000000 RSI: 0000000000000017 RDI: > 0000000000052cc0 > [ 11.241406] [ T1751] RBP: 00000005c2980d00 R08: ffffa32dc63abe00 R09: > ffffa32dc63abe10 > [ 11.241407] [ T1751] R10: 0000000000000018 R11: 0000000000000000 R12: > 00000000ffffffff > [ 11.241408] [ T1751] R13: ffff8c7e8d480010 R14: 00000005c2980d00 R15: > ffffa32dc63abd28 > [ 11.241410] [ T1751] FS: 00007fc1f34ed680(0000) GS:ffff8c8d2e780000(0000) > knlGS:0000000000000000 > [ 11.241412] [ T1751] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 11.241413] [ T1751] CR2: 00007fc1e0e2850b CR3: 00000002a28b8000 CR4: > 0000000000750ef0 > [ 11.241414] [ T1751] PKRU: 55555554 > [ 11.241415] [ T1751] Call Trace: > [ 11.241417] [ T1751] > [ 11.241419] [ T1751] ? __warn.cold+0x90/0x9e > [ 11.241423] [ T1751] ? __kvmalloc_node_noprof+0xa2/0xb0 > [ 11.241426] [ T1751] ? report_bug+0xfa/0x140 > [ 11.241430] [ T1751] ? handle_bug+0x53/0x90 > [ 11.241432] [ T1751] ? exc_invalid_op+0x17/0x70 > [ 11.241435] [ T1751] ? asm_exc_invalid_op+0x1a/0x20 > [ 11.241438] [ T1751] ? __kvmalloc_node_noprof+0xa2/0xb0 > [ 11.241442] [ T1751] amdgpu_bo_create_list_entry_array+0x38/0x150 [amdgpu] > [ 11.241810] [ T1751] ? rt_spin_unlock+0x12/0x40 > [ 11.241815] [ T1751] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 11.241821] [ T1751] amdgpu_bo_list_ioctl+0x47/0x340 [amdgpu] > [ 11.242282] [ T1751] ? __pfx_amdgpu_bo_list_ioctl+0x10/0x10 [amdgpu] > [ 11.242622] [ T1751] drm_ioctl_kernel+0xa3/0xf0 > [ 11.242627] [ T1751] drm_ioctl+0x25e/0x4e0 > [ 11.242630] [ T1751] ? __pfx_amdgpu_bo_list_ioctl+0x10/0x10 [amdgpu] > [ 11.242930] [ T1751] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 11.242934] [ T1751] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 11.242936] [ T1751] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 11.242938] [ T1751] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 11.242941] [ T1751] amdgpu_drm_ioctl+0x46/0x80 [amdgpu] > [ 11.243238] [ T1751] __x64_sys_ioctl+0x92/0xc0 > [ 11.243244] [ T1751] do_syscall_64+0x5f/0x1a0 > [ 11.243249] [ T1751] entry_SYSCALL_64_after_hwframe+0x76/0x7e > [ 11.243253] [ T1751] RIP: 0033:0x7fc1f381c8db > [ 11.243255] [ T1751] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 > 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 > <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 > [ 11.243257] [ T1751] RSP: 002b:00007ffcb8530080 EFLAGS: 00000246 ORIG_RAX: > 0000000000000010 > [ 11.243260] [ T1751] RAX: ffffffffffffffda RBX: 0000564fd56bc7a0 RCX: > 00007fc1f381c8db > [ 11.243261] [ T1751] RDX: 00007ffcb8530130 RSI: 00000000c0106443 RDI: > 0000000000000006 > [ 11.243262] [ T1751] RBP: 00007ffcb8530130 R08: 0000000000000000 R09: > 0000000000000000 > [ 11.243263] [ T1751] R10: 000000000000002b R11: 0000000000000246 R12: > 00000000c0106443 > [ 11.243265] [ T1751] R13: 0000000000000006 R14: 00007ffcb85301a0 R15: > 0000564fd56bc7b8 > [ 11.243269] [ T1751] > [ 11.243270] [ T1751] ---[ end trace 0000000000000000 ]--- > > This warning indicates that a kvmalloc() was requested with a size > INT_MAX and failed (NULL was returned) >> >>> >>> As a sidenote, I've tested several kernel with nokaslr as command line parameter >>> (6.1.128, 6.8.12, 6.12.17 (the debian sid distributional kernel)) and nokaslr is >>> not recognized as a command line parameter in any of them >>> >> >> Please see my comment above about booting. How did you check if nokaslr is being >> recognized, is it via looking up dmesg? >> > When I boot with nokaslr I get the following messages in dmesg > [ T0] Unknown kernel command line parameters "nokaslr > BOOT_IMAGE=/boot/vmlinuz-6.14.0-rc5-next-20250307-master", will be passed to > user space. > > This also happens when I use the debian kernel with standard .config That is quite strange, I can see nokaslr handling in choose_random_location() in arch/x86/boot/compressed/kaslr.c (which depends on CONFIG_RANDOMIZE_BASE) Thanks, Balbir