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kitakar5525 / chromeos-kernel-linux-surface

linux-surface kernel for chromiumos.
GNU General Public License v3.0
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chromeos-5.4: tpm_tis causes kernel oops #20

Open kitakar5525 opened 4 years ago

kitakar5525 commented 4 years ago

Not bootable on SB1 !!!. It reboots on chrome logo. (But works well on Surface 3... why?) I released this binary anyway because it works with Surface 3. I'll look into what's happening on SB1 later. So, if you want to use v5.4 kernels but this release doesn't work, try 5.4.24 version for now. EDIT: after installing other kernel version then reinstalling this version, it started working on SB1. Hmm?

https://github.com/kitakar5525/chromeos-kernel-linux-surface/releases/tag/chromeos-v5.4.39.r4076.d37238f2773c3-surface-brunch

I sometimes encounter that v5.4 kernels don't boot on SB1; it turned out that tpm_tis module causes kernel oops:

dmesg log

``` # # sudo modprobe tpm_tis # kern :debug : [ 347.275763] acpi IFX0562:00: GPIO: looking up 0 in _CRS kern :info : [ 347.281797] tpm_tis IFX0562:00: 2.0 TPM (device-id 0x1A, rev-id 16) kern :alert : [ 347.302914] BUG: unable to handle page fault for address: ffffb14b40372000 kern :alert : [ 347.302930] #PF: supervisor read access in kernel mode kern :alert : [ 347.302937] #PF: error_code(0x0000) - not-present page kern :info : [ 347.302944] PGD 45d561067 P4D 45d561067 PUD 45d564067 PMD 45cdcc067 PTE 0 kern :warn : [ 347.302959] Oops: 0000 [#1] PREEMPT SMP PTI kern :warn : [ 347.302970] CPU: 1 PID: 8555 Comm: modprobe Tainted: G C 5.4.43-04966-g44ecd9e48613 #21 kern :warn : [ 347.302980] Hardware name: Microsoft Corporation Surface Book/Surface Book, BIOS 92.3192.768 03.24.2020 kern :warn : [ 347.302998] RIP: 0010:tpm_read_log_efi+0x17c/0x1b8 [tpm] kern :warn : [ 347.303008] Code: e8 d8 50 a4 c3 eb 41 48 89 83 68 07 00 00 41 8b 55 04 4c 01 f0 41 bc 02 00 00 00 48 89 c7 48 63 0d 02 db 31 c5 48 8d 74 15 10 a4 48 63 05 f4 da 31 c5 49 01 c6 4c 03 b3 68 07 00 00 4c 89 b3 kern :warn : [ 347.303025] RSP: 0018:ffffb14b6a813b00 EFLAGS: 00010286 kern :warn : [ 347.303033] RAX: ffff9c79aa0ec7a9 RBX: ffff9c789fd99000 RCX: fffffffffffff0a1 kern :warn : [ 347.303042] RDX: 0000000000000a19 RSI: ffffb14b40372000 RDI: ffff9c79aa0ecd80 kern :warn : [ 347.303050] RBP: ffffb14b40371000 R08: 0000000000000000 R09: 8000000000000063 kern :warn : [ 347.303059] R10: 000ffffffffff000 R11: 0000000000000001 R12: 0000000000000002 kern :warn : [ 347.303067] R13: ffff9c7904d98018 R14: 00000000000047a9 R15: ffff9c7c311f2328 kern :warn : [ 347.303076] FS: 00007ead3aa90740(0000) GS:ffff9c7cdf280000(0000) knlGS:0000000000000000 kern :warn : [ 347.303086] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kern :warn : [ 347.303093] CR2: ffffb14b40372000 CR3: 0000000102a04004 CR4: 00000000003606e0 kern :warn : [ 347.303101] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kern :warn : [ 347.303110] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kern :warn : [ 347.303117] Call Trace: kern :warn : [ 347.303133] tpm_bios_log_setup+0x67/0x16e [tpm] kern :warn : [ 347.303146] tpm_chip_register+0x8d/0x248 [tpm] kern :warn : [ 347.303159] tpm_tis_core_init+0x5b5/0x601 [tpm_tis_core] kern :warn : [ 347.303176] tpm_tis_plat_probe+0xa0/0xbe [tpm_tis] kern :warn : [ 347.303191] platform_drv_probe+0x44/0x85 kern :warn : [ 347.303203] really_probe+0x1bb/0x3d4 kern :warn : [ 347.303214] driver_probe_device+0xd5/0x10a kern :warn : [ 347.303226] device_driver_attach+0x3c/0x55 kern :warn : [ 347.303236] __driver_attach+0x110/0x119 kern :warn : [ 347.303246] ? device_driver_attach+0x55/0x55 kern :warn : [ 347.303255] bus_for_each_dev+0x73/0xa9 kern :warn : [ 347.303266] bus_add_driver+0x12c/0x1de kern :warn : [ 347.303276] driver_register+0x9e/0xd7 kern :warn : [ 347.303285] ? 0xffffffffc0856000 kern :warn : [ 347.303296] init_tis+0x8d/0x1000 [tpm_tis] kern :warn : [ 347.303309] ? kernel_read+0x59/0x66 kern :warn : [ 347.303320] ? ___might_sleep+0x47/0x146 kern :warn : [ 347.303334] do_one_initcall+0xa4/0x1c9 kern :warn : [ 347.303346] ? slab_pre_alloc_hook+0x31/0x43 kern :warn : [ 347.303356] ? kmem_cache_alloc_trace+0xf4/0x106 kern :warn : [ 347.303369] do_init_module+0x5b/0x204 kern :warn : [ 347.303380] __do_sys_finit_module+0xb4/0xdb kern :warn : [ 347.303391] do_syscall_64+0x4b/0x59 kern :warn : [ 347.303401] entry_SYSCALL_64_after_hwframe+0x44/0xa9 kern :warn : [ 347.303410] RIP: 0033:0x7ead3a5d3199 kern :warn : [ 347.303419] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 9f 9c 2b 00 f7 d8 64 89 01 48 kern :warn : [ 347.303435] RSP: 002b:00007fff1e6a0488 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 kern :warn : [ 347.303446] RAX: ffffffffffffffda RBX: 000057863ff80cb0 RCX: 00007ead3a5d3199 kern :warn : [ 347.303454] RDX: 0000000000000000 RSI: 000057863e7ece58 RDI: 0000000000000003 kern :warn : [ 347.303461] RBP: 00007fff1e6a04d0 R08: 0000000000000000 R09: 000057863ff804b0 kern :warn : [ 347.303469] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 kern :warn : [ 347.303477] R13: 000057863ff80b80 R14: 000057863e7ece58 R15: 0000000000000000 kern :warn : [ 347.303487] Modules linked in: tpm_tis(+) nls_iso8859_1 nls_cp437 vfat fat snd_seq_dummy snd_seq snd_seq_device veth bridge stp llc tun nf_nat_tftp nf_conntrack_tftp nf_nat_ftp nf_conntrack_ftp esp6 ah6 ip6t_REJECT ip6t_ipv6header cmac rfcomm uinput xt_MASQUERADE fuse usbhid iio_trig_sysfs hid_sensor_cros_compat hid_sensor_iio_common industrialio_triggered_buffer kfifo_buf industrialio surface_sam_sid_gpelid tpm_crb surfacepro3_button soc_button_array surface_sam_sid tpm_tis_core btusb btrtl btbcm btintel bluetooth ecdh_generic ecc lzo_rle lzo_compress snd_hda_codec_hdmi zram snd_hda_codec_realtek snd_soc_skl snd_hda_codec_generic joydev snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core snd_hda_intel ipts snd_intel_dspcfg snd_hda_codec ipu3_cio2 ipu3_imgu(C) mwifiex_pcie snd_hwdep snd_hda_core v4l2_fwnode mwifiex mei_me videobuf2_dma_sg videobuf2_memops videobuf2_v4l2 videobuf2_common cfg80211 tpm_vtpm_proxy tablet_mode_switch tpm i915 kern :warn : [ 347.303603] CR2: ffffb14b40372000 kern :warn : [ 347.303611] ---[ end trace 5675b83dc3b769d4 ]--- kern :warn : [ 347.359703] RIP: 0010:tpm_read_log_efi+0x17c/0x1b8 [tpm] kern :warn : [ 347.359708] Code: e8 d8 50 a4 c3 eb 41 48 89 83 68 07 00 00 41 8b 55 04 4c 01 f0 41 bc 02 00 00 00 48 89 c7 48 63 0d 02 db 31 c5 48 8d 74 15 10 a4 48 63 05 f4 da 31 c5 49 01 c6 4c 03 b3 68 07 00 00 4c 89 b3 kern :warn : [ 347.359713] RSP: 0018:ffffb14b6a813b00 EFLAGS: 00010286 kern :warn : [ 347.359716] RAX: ffff9c79aa0ec7a9 RBX: ffff9c789fd99000 RCX: fffffffffffff0a1 kern :warn : [ 347.359719] RDX: 0000000000000a19 RSI: ffffb14b40372000 RDI: ffff9c79aa0ecd80 kern :warn : [ 347.359721] RBP: ffffb14b40371000 R08: 0000000000000000 R09: 8000000000000063 kern :warn : [ 347.359724] R10: 000ffffffffff000 R11: 0000000000000001 R12: 0000000000000002 kern :warn : [ 347.359727] R13: ffff9c7904d98018 R14: 00000000000047a9 R15: ffff9c7c311f2328 kern :warn : [ 347.359730] FS: 00007ead3aa90740(0000) GS:ffff9c7cdf280000(0000) knlGS:0000000000000000 kern :warn : [ 347.359733] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kern :warn : [ 347.359735] CR2: ffffb14b40372000 CR3: 0000000102a04004 CR4: 00000000003606e0 kern :warn : [ 347.359738] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kern :warn : [ 347.359740] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kern :err : [ 347.359743] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1494 kern :err : [ 347.359747] in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 8555, name: modprobe kern :warn : [ 347.359751] CPU: 1 PID: 8555 Comm: modprobe Tainted: G D C 5.4.43-04966-g44ecd9e48613 #21 kern :warn : [ 347.359754] Hardware name: Microsoft Corporation Surface Book/Surface Book, BIOS 92.3192.768 03.24.2020 kern :warn : [ 347.359757] Call Trace: kern :warn : [ 347.359762] dump_stack+0x50/0x63 kern :warn : [ 347.359767] ___might_sleep+0x12f/0x146 kern :warn : [ 347.359772] down_read+0x1c/0x25 kern :warn : [ 347.359776] __blocking_notifier_call_chain+0x32/0x63 kern :warn : [ 347.359779] do_exit+0x37/0x9c2 kern :warn : [ 347.359783] rewind_stack_do_exit+0x17/0x20 kern :warn : [ 347.359786] RIP: 0033:0x7ead3a5d3199 kern :warn : [ 347.359789] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 9f 9c 2b 00 f7 d8 64 89 01 48 kern :warn : [ 347.359794] RSP: 002b:00007fff1e6a0488 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 kern :warn : [ 347.359797] RAX: ffffffffffffffda RBX: 000057863ff80cb0 RCX: 00007ead3a5d3199 kern :warn : [ 347.359800] RDX: 0000000000000000 RSI: 000057863e7ece58 RDI: 0000000000000003 kern :warn : [ 347.359802] RBP: 00007fff1e6a04d0 R08: 0000000000000000 R09: 000057863ff804b0 kern :warn : [ 347.359805] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 kern :warn : [ 347.359807] R13: 000057863ff80b80 R14: 000057863e7ece58 R15: 0000000000000000 ```

On normal chromeos kernel config, oops is treated as panic and when panic happened, chromeos reboots automatically by the following config:

CONFIG_PANIC_ON_OOPS=y
CONFIG_PANIC_TIMEOUT=-1
kitakar5525 commented 4 years ago

I tried my older release chromeos-kernel-linux-surface-5.4.14 and I can reproduce this issue there🤔

Maybe some userspace changes triggered this issue (?)

For those affected by this issue, I recommend using v4.19 kernel for now.

kitakar5525 commented 4 years ago

Looks very similar to this: https://github.com/torvalds/linux/commit/e658c82be5561412c5e83b5e74e9da4830593f3e but should be fixed now...

kitakar5525 commented 4 years ago

For now, I gave up figuring out what's happening.

If you still want to use v5.4 series but affected by this issue, try the following: I guess everyone uses swtpm. So, just blacklist tpm_tis module for now. You can do so by adding module_blacklist=tpm_tis to bootloader.

kitakar5525 commented 4 years ago

I can reproduce a similar tpm_tis module crashing by reloading the module on Arch Linux with 5.7.2-arch1-1-surface. So, this is upstream Linux kernel issue.

dmesg log

```bash $ sudo modprobe -r tpm_tis $ sudo modprobe tpm_tis zsh: killed sudo modprobe tpm_tis $ dmesg -xw kern :info : [153894.342734] tpm_tis IFX0562:00: 2.0 TPM (device-id 0x1A, rev-id 16) kern :alert : [153894.367899] BUG: unable to handle page fault for address: ffffad71405f0000 kern :alert : [153894.367905] #PF: supervisor read access in kernel mode kern :alert : [153894.367907] #PF: error_code(0x0000) - not-present page kern :info : [153894.367907] PGD 45d942067 P4D 45d942067 PUD 45d943067 PMD 45cedb067 PTE 0 kern :warn : [153894.367911] Oops: 0000 [#1] PREEMPT SMP PTI kern :warn : [153894.367914] CPU: 3 PID: 240328 Comm: modprobe Tainted: G C OE 5.7.2-arch1-1-surface #1 kern :warn : [153894.367916] Hardware name: Microsoft Corporation Surface Book/Surface Book, BIOS 92.3192.768 03.24.2020 kern :warn : [153894.367922] RIP: 0010:memcpy_erms+0x6/0x10 kern :warn : [153894.367923] Code: cc cc cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe kern :warn : [153894.367925] RSP: 0018:ffffad716c50b978 EFLAGS: 00010286 kern :warn : [153894.367926] RAX: ffff9655e7a5c1ba RBX: ffff96569ada6000 RCX: fffffffffffff0a1 kern :warn : [153894.367927] RDX: fffffffffffffc67 RSI: ffffad71405f0000 RDI: ffff9655e7a5cd80 kern :warn : [153894.367928] RBP: ffffad71405ef000 R08: 0000000000008000 R09: 000000008bebb0a0 kern :warn : [153894.367929] R10: ffffad7140000000 R11: ffffad71405ef000 R12: 00000000000041ba kern :warn : [153894.367930] R13: ffff96569ada6750 R14: 0000000000000002 R15: ffff9652c85fe018 kern :warn : [153894.367932] FS: 00007f6c76421740(0000) GS:ffff96569f580000(0000) knlGS:0000000000000000 kern :warn : [153894.367933] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kern :warn : [153894.367934] CR2: ffffad71405f0000 CR3: 000000040033e006 CR4: 00000000003606e0 kern :warn : [153894.367935] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kern :warn : [153894.367936] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kern :warn : [153894.367936] Call Trace: kern :warn : [153894.367949] tpm_read_log_efi+0x152/0x1b0 [tpm] kern :warn : [153894.367953] tpm_bios_log_setup+0xcc/0x1d0 [tpm] kern :warn : [153894.367956] tpm_chip_register+0x8f/0x260 [tpm] kern :warn : [153894.367962] tpm_tis_core_init.cold+0x20d/0x13da [tpm_tis_core] kern :warn : [153894.367969] tpm_tis_plat_probe+0xcc/0xea [tpm_tis] kern :warn : [153894.367974] platform_drv_probe+0x4d/0x90 kern :warn : [153894.367977] really_probe+0x2d4/0x410 kern :warn : [153894.367979] driver_probe_device+0xb6/0x100 kern :warn : [153894.367981] device_driver_attach+0xa1/0xb0 kern :warn : [153894.367984] __driver_attach+0x8a/0x150 kern :warn : [153894.367986] ? device_driver_attach+0xb0/0xb0 kern :warn : [153894.367988] ? device_driver_attach+0xb0/0xb0 kern :warn : [153894.367989] bus_for_each_dev+0x89/0xd0 kern :warn : [153894.367992] bus_add_driver+0x12b/0x1e0 kern :warn : [153894.367995] driver_register+0x8b/0xe0 kern :warn : [153894.367996] ? 0xffffffffc15b5000 kern :warn : [153894.367999] init_tis+0x8d/0x1000 [tpm_tis] kern :warn : [153894.368004] do_one_initcall+0x59/0x240 kern :warn : [153894.368009] do_init_module+0x5c/0x260 kern :warn : [153894.368011] load_module+0x2137/0x23a0 kern :warn : [153894.368016] __do_sys_init_module+0x172/0x1a0 kern :warn : [153894.368020] do_syscall_64+0x49/0x90 kern :warn : [153894.368024] entry_SYSCALL_64_after_hwframe+0x44/0xa9 kern :warn : [153894.368025] RIP: 0033:0x7f6c7654e73e kern :warn : [153894.368027] Code: 48 8b 0d 55 f7 0b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 22 f7 0b 00 f7 d8 64 89 01 48 kern :warn : [153894.368029] RSP: 002b:00007ffcdfb1fa68 EFLAGS: 00000246 ORIG_RAX: 00000000000000af kern :warn : [153894.368030] RAX: ffffffffffffffda RBX: 0000560fc86e8c30 RCX: 00007f6c7654e73e kern :warn : [153894.368031] RDX: 0000560fc7839368 RSI: 0000000000004dc9 RDI: 0000560fc8f00fc0 kern :warn : [153894.368032] RBP: 0000560fc8f00fc0 R08: 0000000000000000 R09: 00007ffcdfb1e6d9 kern :warn : [153894.368033] R10: 0000000000000001 R11: 0000000000000246 R12: 0000560fc7839368 kern :warn : [153894.368034] R13: 0000000000000000 R14: 0000560fc86e8e40 R15: 0000560fc86e8c30 kern :warn : [153894.368036] Modules linked in: tpm_tis(+) tpm_tis_core uas iptable_mangle xt_CHECKSUM xt_tcpudp iptable_nat xt_comment xt_MASQUERADE nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c bridge stp llc iptable_filter usb_storage rfcomm cmac algif_hash algif_skcipher af_alg bnep btusb btrtl btbcm btintel bluetooth ecdh_generic ecc zram msr uinput mousedev intel_rapl_msr joydev intel_rapl_common input_leds x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_soc_skl snd_soc_sst_ipc hid_sensor_accel_3d hid_sensor_als hid_sensor_gyro_3d hid_sensor_rotation snd_soc_sst_dsp snd_hda_codec_hdmi irqbypass hid_sensor_trigger industrialio_triggered_buffer snd_hda_ext_core kfifo_buf hid_sensor_iio_common snd_soc_acpi_intel_match snd_soc_acpi industrialio snd_soc_core hid_multitouch snd_hda_codec_realtek crct10dif_pclmul snd_hda_codec_generic snd_compress ledtrig_audio ac97_bus crc32_pclmul snd_pcm_dmaengine ghash_clmulni_intel snd_hda_intel snd_intel_dspcfg mwifiex_pcie usbhid kern :warn : [153894.368066] mei_hdcp snd_hda_codec hid_sensor_hub ipts(OE) hid_generic mwifiex aesni_intel squashfs snd_hda_core nls_iso8859_1 nls_cp437 snd_hwdep crypto_simd vfat cryptd fat snd_pcm glue_helper intel_cstate intel_uncore snd_timer fuse loop intel_rapl_perf cfg80211 pcspkr snd soundcore ipu3_imgu(C) ipu3_cio2 rfkill videobuf2_dma_sg ov7251(OE) videobuf2_memops mei_me videobuf2_v4l2 videobuf2_common v4l2_fwnode mei ov5693 intel_lpss_pci intel_xhci_usb_role_switch intel_lpss roles idma64 intel_pch_thermal videodev mc i2c_hid tpm_crb battery surfacepro3_button soc_button_array ac evdev mac_hid hid tpm rng_core surface_sam_sid vboxnetflt(OE) vboxnetadp(OE) vboxdrv(OE) pkcs8_key_parser sg crypto_user acpi_call(OE) ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 xhci_pci crc32c_intel xhci_hcd i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec rc_core drm intel_agp intel_gtt agpgart [last unloaded: tpm_tis_core] kern :warn : [153894.368103] CR2: ffffad71405f0000 kern :warn : [153894.368106] ---[ end trace 1d0e282eccfb86d6 ]--- kern :warn : [153894.368108] RIP: 0010:memcpy_erms+0x6/0x10 kern :warn : [153894.368110] Code: cc cc cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe kern :warn : [153894.368111] RSP: 0018:ffffad716c50b978 EFLAGS: 00010286 kern :warn : [153894.368112] RAX: ffff9655e7a5c1ba RBX: ffff96569ada6000 RCX: fffffffffffff0a1 kern :warn : [153894.368113] RDX: fffffffffffffc67 RSI: ffffad71405f0000 RDI: ffff9655e7a5cd80 kern :warn : [153894.368113] RBP: ffffad71405ef000 R08: 0000000000008000 R09: 000000008bebb0a0 kern :warn : [153894.368114] R10: ffffad7140000000 R11: ffffad71405ef000 R12: 00000000000041ba kern :warn : [153894.368115] R13: ffff96569ada6750 R14: 0000000000000002 R15: ffff9652c85fe018 kern :warn : [153894.368116] FS: 00007f6c76421740(0000) GS:ffff96569f580000(0000) knlGS:0000000000000000 kern :warn : [153894.368118] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kern :warn : [153894.368119] CR2: ffffad71405f0000 CR3: 000000040033e006 CR4: 00000000003606e0 kern :warn : [153894.368121] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kern :warn : [153894.368123] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ```