Encryption causes kernel panics (with and without compression) within an hour of high write I/O load #10570
Description
System information
| Type | Version/Name |
|---|---|
| Distribution Name | Arch Linux |
| Linux Kernel | 5.7.7.a-hardened, 5.6.19.a-hardened, 5.4.50-lts |
| Architecture | amd64 |
| ZFS Version | 0.8.4 (DKMS) |
| SPL Version | 0.8.4 (DKMS) |
Describe the problem you're observing
Within an hour of boot and starting high write I/O to a freshly-created encrypted dataset, the module panics kernels >=5.6 on the basis of referring to a memory page that's not present. On LTS kernel 5.4 the same situation leads to a race condition between outputting the panic message over serial and outright system lockup, haven't managed to grab a panic yet, but have observed it in dmesg at least once.
This replicates on two distinct machines - AMD Ryzen 9 3950X and AMD FX-8370, both stable. Entire day of running memtest86 turns up no memory issues on either.
Describe how to reproduce the problem
Kernel parameters: pti=on page_alloc.shuffle=1 rw net.ifnames=0 verbose nowatchdog amd_iommu=on intel_iommu=on kvm-intel.nested=1 kvm-amd.nested=1 scsi_mod.use_blk_mq=1 elevator=bfq bfq.low_latency=1 loop.max_loop=256 random.trust_cpu=off mem_encrypt=off audit=0 loglevel=3 console=tty0 console=ttyS0,115200n8
RAID-Z1 pool creation and configuration commands, with options:
zpool create -o feature@encryption=enabled -o cachefile=/etc/zfs/zpool.cache -o autoexpand=on -o autotrim=on -o ashift=12 pool0 raidz1 <list of SSD block devs>
zfs set sharenfs=on sharesmb=on atime=off dedup=sha512,verify sync=always pool0
zfs set compression=lz4 pool0
#zfs set compression=gzip-9 pool0
#zfs set compression=off pool0
zfs create -o encryption=aes-256-gcm -o keyformat=passphrase -o keylocation=prompt pool0/fs0
The behavior is observed during an SFTP session started with lftp running a mirror command with parallel-transfer-count set to 5 and use-pget-n set to 4, resulting in 20 SFTP connections.
If necessary, I'm able to leverage the FX-8370 system (just because it still has a serial port) to provide iterative testing.
Include any warning/errors/backtraces from the system logs
Panic on encrypted, LZ4-compressed RAID-Z1 pool:
[ 570.089028] BUG: unable to handle page fault for address: ffffadf53be3c000
[ 570.095981] #PF: supervisor read access in kernel mode
[ 570.101158] #PF: error_code(0x0000) - not-present page
[ 570.106333] PGD 613959067 P4D 613959067 PUD 61395a067 PMD 544c46067 PTE 0
[ 570.113188] Oops: 0000 [#1] PREEMPT SMP PTI
[ 570.117412] CPU: 5 PID: 1698 Comm: z_wr_iss Tainted: P OE 5.7.7.a-1-hardened #1
[ 570.125992] Hardware name: MSI MS-7693/970A-G46 (MS-7693), BIOS V2.8 01/08/2016
[ 570.133512] RIP: 0010:lz4_compress_zfs+0x61c/0x7b0 [zfs]
[ 570.138871] Code: 01 00 00 41 c6 07 00 49 8d 47 01 49 89 d0 48 83 c0 02 4c 8d 59 04 49 29 c8 66 44 89 40 fe 4c 8d 42 04 4c 89 c2 4d 39 c8 73 1c <49> 8b 0b 4c 8b 12 4c 39 d1 0f 85 2e ff ff ff 48 83 c2 08 49 83 c3
[ 570.157774] RSP: 0018:ffffadf503963cc8 EFLAGS: 00010297
[ 570.163042] RAX: ffffadf539441748 RBX: ffffadf53be2b000 RCX: 0000000000000000
[ 570.170228] RDX: ffffadf53be3c000 RSI: ffffadf53944be40 RDI: ffffadf53be42e00
[ 570.177413] RBP: 0000000000017e00 R08: ffffadf53be3b030 R09: ffffadf53be42df4
[ 570.184600] R10: 0000000000000000 R11: ffffadf53be3bffe R12: ffffadf539437004
[ 570.191794] R13: ffff9fff5d3b8000 R14: ffffadf53be3b020 R15: ffffadf539441745
[ 570.198990] FS: 0000000000000000(0000) GS:ffffa00356d40000(0000) knlGS:0000000000000000
[ 570.207140] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 570.212928] CR2: ffffadf53be3c000 CR3: 0000000509a4a000 CR4: 00000000000406e0
[ 570.220112] Call Trace:
[ 570.222750] zio_compress_data+0x83/0xc0 [zfs]
[ 570.227399] zio_write_compress+0x447/0x8f0 [zfs]
[ 570.232281] zio_execute+0x86/0xe0 [zfs]
[ 570.236247] taskq_thread+0x2d2/0x510 [spl]
[ 570.240469] ? wake_up_q+0xa0/0xa0
[ 570.244028] ? zio_subblock+0x40/0x40 [zfs]
[ 570.248261] ? taskq_thread_spawn+0x60/0x60 [spl]
[ 570.253003] kthread+0x140/0x160
[ 570.256268] ? __kthread_bind_mask+0x70/0x70
[ 570.260575] ret_from_fork+0x22/0x40
[ 570.264184] Modules linked in: nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo br_netfilter overlay xt_comment xt_CHECKSUM xt_MASQUERADE ip6table_mangle ip6table_nat iptable_mangle iptable_nat ebtable_filter ebtables tun bridge stp llc amdgpu gpu_sched zram wl(POE) zfs(POE) zunicode(POE) zavl(POE) nls_iso8859_1 icp(POE) nls_cp437 vfat fat ath9k ath9k_common ath9k_hw snd_hda_codec_realtek zcommon(POE) ath radeon znvpair(POE) mac80211 edac_mce_amd snd_hda_codec_generic spl(OE) kvm_amd ledtrig_audio snd_hda_codec_hdmi zlua(POE) ccp snd_hda_intel rng_core snd_intel_dspcfg kvm snd_hda_codec i2c_algo_bit ttm snd_hda_core cfg80211 drm_kms_helper r8169 snd_hwdep snd_pcm sp5100_tco mxm_wmi cec realtek pcspkr rfkill input_leds fam15h_power libphy rc_core joydev k10temp i2c_piix4 mousedev libarc4 snd_timer syscopyarea sysfillrect snd sysimgblt fb_sys_fops soundcore evdev mac_hid acpi_cpufreq nf_log_ipv4 nf_log_common ipt_REJECT nf_reject_ipv4 xt_LOG xt_multiport xt_limit xt_addrtype xt_tcpudp
[ 570.264269] xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_filter drm fuse crypto_user acpi_call(OE) agpgart ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 dm_crypt dm_mod hid_generic usbhid hid uas usb_storage ohci_pci crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper ehci_pci ehci_hcd xhci_pci ohci_hcd xhci_hcd wmi vfio_pci irqbypass vfio_virqfd vfio_iommu_type1 vfio
[ 570.402898] CR2: ffffadf53be3c000
[ 570.406249] ---[ end trace 6179ed1e42989fba ]---
[ 570.411067] RIP: 0010:lz4_compress_zfs+0x61c/0x7b0 [zfs]
[ 570.416428] Code: 01 00 00 41 c6 07 00 49 8d 47 01 49 89 d0 48 83 c0 02 4c 8d 59 04 49 29 c8 66 44 89 40 fe 4c 8d 42 04 4c 89 c2 4d 39 c8 73 1c <49> 8b 0b 4c 8b 12 4c 39 d1 0f 85 2e ff ff ff 48 83 c2 08 49 83 c3
[ 570.435353] RSP: 0018:ffffadf503963cc8 EFLAGS: 00010297
[ 570.440617] RAX: ffffadf539441748 RBX: ffffadf53be2b000 RCX: 0000000000000000
[ 570.447802] RDX: ffffadf53be3c000 RSI: ffffadf53944be40 RDI: ffffadf53be42e00
[ 570.454989] RBP: 0000000000017e00 R08: ffffadf53be3b030 R09: ffffadf53be42df4
[ 570.462191] R10: 0000000000000000 R11: ffffadf53be3bffe R12: ffffadf539437004
[ 570.469386] R13: ffff9fff5d3b8000 R14: ffffadf53be3b020 R15: ffffadf539441745
[ 570.476573] FS: 0000000000000000(0000) GS:ffffa00356d40000(0000) knlGS:0000000000000000
[ 570.484717] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 570.490503] CR2: ffffadf53be3c000 CR3: 0000000509a4a000 CR4: 00000000000406e0
[ 570.497693] Kernel panic - not syncing: Fatal exception
[ 570.503006] Kernel Offset: 0x2b000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 570.517830] ---[ end Kernel panic - not syncing: Fatal exception ]---
Panic on encrypted, gzip9-compressed RAID-Z1 pool:
[ 2539.897638] BUG: unable to handle page fault for address: ffffadbd11b56000
[ 2539.904574] #PF: supervisor read access in kernel mode
[ 2539.909752] #PF: error_code(0x0000) - not-present page
[ 2539.914929] PGD 613959067 P4D 613959067 PUD 108111067 PMD 334fed067 PTE 0
[ 2539.921776] Oops: 0000 [#1] PREEMPT SMP PTI
[ 2539.925994] CPU: 7 PID: 1796 Comm: z_wr_iss Tainted: P OE 5.7.7.a-1-hardened #1
[ 2539.934579] Hardware name: MSI MS-7693/970A-G46 (MS-7693), BIOS V2.8 01/08/2016
[ 2539.941934] RIP: 0010:fill_window+0x21d/0x480
[ 2539.946315] Code: 89 7c 24 30 83 fa 0f 0f 86 7c 01 00 00 83 e8 10 89 44 24 40 c1 e8 04 89 44 24 34 83 c0 01 48 c1 e0 04 4c 01 d0 48 89 44 24 18 <41> 0f b6 02 41 0f b6 52 02 49 83 c2 10 45 0f b6 72 f3 45 0f b6 6a
[ 2539.965178] RSP: 0018:ffffadbc4364fb18 EFLAGS: 00010287
[ 2539.970425] RAX: 000000000002c56f RBX: 0000000000046f18 RCX: 000000000007c26a
[ 2539.977625] RDX: 000000000008de30 RSI: 0000000000073487 RDI: 000000000006a6a4
[ 2539.984813] RBP: 000000000003e135 R08: 00000000000618c1 R09: 0000000000058ade
[ 2539.992006] R10: ffffadbd11b56000 R11: 000000000004fcfb R12: 0000000000035352
[ 2539.999189] R13: 0000000000008de3 R14: 0000000000008de3 R15: 0000000000008de3
[ 2540.006394] FS: 0000000000000000(0000) GS:ffff8c1cd6dc0000(0000) knlGS:0000000000000000
[ 2540.014551] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2540.020352] CR2: ffffadbd11b56000 CR3: 000000056c442000 CR4: 00000000000406e0
[ 2540.027536] Call Trace:
[ 2540.030018] deflate_slow+0x133/0x550
[ 2540.033715] zlib_deflate+0xce/0x520
[ 2540.037383] z_compress_level+0xb3/0x140 [spl]
[ 2540.042039] gzip_compress+0x48/0x90 [zfs]
[ 2540.046295] zio_compress_data+0x83/0xc0 [zfs]
[ 2540.050901] zio_write_compress+0x447/0x8f0 [zfs]
[ 2540.055770] zio_execute+0x86/0xe0 [zfs]
[ 2540.059743] taskq_thread+0x2d2/0x510 [spl]
[ 2540.063974] ? wake_up_q+0xa0/0xa0
[ 2540.067541] ? zio_subblock+0x40/0x40 [zfs]
[ 2540.071776] ? taskq_thread_spawn+0x60/0x60 [spl]
[ 2540.076513] kthread+0x140/0x160
[ 2540.079769] ? __kthread_bind_mask+0x70/0x70
[ 2540.084072] ret_from_fork+0x22/0x40
[ 2540.087676] Modules linked in: nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo br_netfilter overlay xt_comment cmac ccm xt_CHECKSUM xt_MASQUERADE ip6table_mangle ip6table_nat iptable_mangle iptable_nat ebtable_filter ebtables amdgpu tun bridge stp llc gpu_sched zram wl(POE) zfs(POE) zunicode(POE) zavl(POE) icp(POE) nls_iso8859_1 nls_cp437 vfat fat ath9k ath9k_common radeon ath9k_hw zcommon(POE) edac_mce_amd snd_hda_codec_realtek znvpair(POE) kvm_amd ath snd_hda_codec_generic spl(OE) ledtrig_audio snd_hda_codec_hdmi mac80211 ccp snd_hda_intel zlua(POE) rng_core snd_intel_dspcfg kvm i2c_algo_bit snd_hda_codec ttm drm_kms_helper snd_hda_core cfg80211 r8169 mxm_wmi cec snd_hwdep mousedev pcspkr snd_pcm realtek rc_core joydev k10temp input_leds snd_timer rfkill syscopyarea
fam15h_power libphy libarc4 snd sysfillrect sysimgblt sp5100_tco soundcore fb_sys_fops i2c_piix4 evdev mac_hid acpi_cpufreq nf_log_ipv4 nf_log_common ipt_REJ
ECT nf_reject_ipv4 xt_LOG xt_multiport xt_limit xt_addrtype
[ 2540.087743] xt_tcpudp xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntr
ack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_filter drm fuse crypto_user acpi_call(OE) agpgart ip_tables x_tables ext4 crc32c_generic crc16 mbcache jb
d2 dm_crypt dm_mod hid_generic usbhid hid uas usb_storage ohci_pci crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel crypto_simd cry
ptd glue_helper ohci_hcd ehci_pci xhci_pci ehci_hcd xhci_hcd wmi vfio_pci irqbypass vfio_virqfd vfio_iommu_type1 vfio
[ 2540.227045] CR2: ffffadbd11b56000
[ 2540.230387] ---[ end trace fd005699bc93c19a ]---
[ 2540.235043] RIP: 0010:fill_window+0x21d/0x480
[ 2540.239436] Code: 89 7c 24 30 83 fa 0f 0f 86 7c 01 00 00 83 e8 10 89 44 24 40 c1 e8 04 89 44 24 34 83 c0 01 48 c1 e0 04 4c 01 d0 48 89 44 24 18 <41> 0f b6
02 41 0f b6 52 02 49 83 c2 10 45 0f b6 72 f3 45 0f b6 6a
[ 2540.258347] RSP: 0018:ffffadbc4364fb18 EFLAGS: 00010287
[ 2540.263616] RAX: 000000000002c56f RBX: 0000000000046f18 RCX: 000000000007c26a
[ 2540.270800] RDX: 000000000008de30 RSI: 0000000000073487 RDI: 000000000006a6a4
[ 2540.277981] RBP: 000000000003e135 R08: 00000000000618c1 R09: 0000000000058ade
[ 2540.285186] R10: ffffadbd11b56000 R11: 000000000004fcfb R12: 0000000000035352
[ 2540.292367] R13: 0000000000008de3 R14: 0000000000008de3 R15: 0000000000008de3
[ 2540.299553] FS: 0000000000000000(0000) GS:ffff8c1cd6dc0000(0000) knlGS:0000000000000000
[ 2540.307702] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2540.313501] CR2: ffffadbd11b56000 CR3: 000000056c442000 CR4: 00000000000406e0
[ 2540.320697] Kernel panic - not syncing: Fatal exception
[ 2540.326032] Kernel Offset: 0xc000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 2540.336798] ---[ end Kernel panic - not syncing: Fatal exception ]---
Panic on encrypted, uncompressed RAID-Z1 pool:
[ 3204.992851] BUG: unable to handle page fault for address: ffffc0e41744a000
[ 3204.999808] #PF: supervisor read access in kernel mode
[ 3205.004998] #PF: error_code(0x0000) - not-present page
[ 3205.010183] PGD 613959067 P4D 613959067 PUD 4a88ce067 PMD 3cbb5d067 PTE 0
[ 3205.017029] Oops: 0000 [#1] PREEMPT SMP PTI
[ 3205.021249] CPU: 4 PID: 1739 Comm: z_wr_iss Tainted: P OE 5.7.7.a-1-hardened #1
[ 3205.029833] Hardware name: MSI MS-7693/970A-G46 (MS-7693), BIOS V2.8 01/08/2016
[ 3205.037226] RIP: 0010:SHA512TransformBlocks+0x83/0x1370 [icp]
[ 3205.043028] Code: 48 8b 4f 10 48 8b 57 18 4c 8b 47 20 4c 8b 4f 28 4c 8b 57 30 4c 8b 5f 38 eb 0d 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 31 ff <4c> 8b 26 49 0f cc 4d 89 c5 4d 89 c6 4d 89 cf 49 c1 cd 0e 49 c1 ce
[ 3205.061936] RSP: 0018:ffffc0e383703680 EFLAGS: 00010246
[ 3205.067204] RAX: c03f909b159c913c RBX: b8f29d46f4625ecc RCX: e5935c1350dffdff
[ 3205.074391] RDX: 2a70b7ccd4a66abc RSI: ffffc0e41744a000 RDI: 0000000000000000
[ 3205.081587] RBP: ffffffffc0f18140 R08: 9d4433f507e7db20 R09: 38cb58c21f8e43d6
[ 3205.088772] R10: d1b1f2448d8bf85d R11: a8b9740da686f405 R12: 7d0f5ddafd42dc4a
[ 3205.095961] R13: ed9c9d6a52f30256 R14: 4ac22b5ed7cffd0f R15: 48800954c44eb109
[ 3205.103147] FS: 0000000000000000(0000) GS:ffffa31f96d00000(0000) knlGS:0000000000000000
[ 3205.111297] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3205.117085] CR2: ffffc0e41744a000 CR3: 0000000354f54000 CR4: 00000000000406e0
[ 3205.124274] Call Trace:
[ 3205.126773] ? SHA2Update+0x1ae/0x1f0 [icp]
[ 3205.131009] ? sha2_mac_atomic+0x2a0/0x330 [icp]
[ 3205.135710] ? crypto_mac+0x2f4/0x3f0 [icp]
[ 3205.140087] ? zio_crypt_do_hmac+0x118/0x1a0 [zfs]
[ 3205.145056] ? zio_crypt_generate_iv_salt_dedup+0x54/0xa0 [zfs]
[ 3205.151137] ? spa_do_crypt_abd+0x118/0x370 [zfs]
[ 3205.156029] ? zio_encrypt+0x44d/0x760 [zfs]
[ 3205.160478] ? zio_execute+0x86/0xe0 [zfs]
[ 3205.164630] ? taskq_thread+0x2d2/0x510 [spl]
[ 3205.169026] ? wake_up_q+0xa0/0xa0
[ 3205.172608] ? zio_subblock+0x40/0x40 [zfs]
[ 3205.176842] ? taskq_thread_spawn+0x60/0x60 [spl]
[ 3205.181586] ? kthread+0x140/0x160
[ 3205.185024] ? __kthread_bind_mask+0x70/0x70
[ 3205.189329] ? ret_from_fork+0x22/0x40
[ 3205.193111] Modules linked in: nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo br_netfilter overlay xt_comment cmac ccm xt_CHECKSUM xt_MASQUERADE ip6table_mangle ip6table_nat iptable_mangle iptable_nat ebtable_filter ebtables amdgpu tun bridge stp llc gpu_sched zram wl(POE) zfs(POE) nls_iso8859_1 nls_cp437 zunicode(POE) vfat fat zavl(POE) icp(POE) radeon edac_mce_amd ath9k ath9k_common ath9k_hw snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi kvm_amd ath i2c_algo_bit snd_hda_intel ttm ccp zcommon(POE) snd_intel_dspcfg mac80211 znvpair(POE) snd_hda_codec rng_core drm_kms_helper spl(OE) kvm snd_hda_core cec snd_hwdep zlua(POE) snd_pcm cfg80211 joydev rc_core mousedev r8169 mxm_wmi input_leds snd_timer sp5100_tco pcspkr realtek rfkill fam15h_power syscopyarea k10temp libphy libarc4 sysfillrect snd i2c_piix4 sysimgblt fb_sys_fops soundcore evdev mac_hid acpi_cpufreq nf_log_ipv4 nf_log_common ipt_REJECT nf_reject_ipv4 xt_LOG xt_multiport xt_limit xt_addrtype
[ 3205.193186] xt_tcpudp xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_filter drm fuse crypto_user acpi_call(OE) agpgart ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 dm_crypt dm_mod hid_generic usbhid hid uas usb_storage ohci_pci crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper ehci_pci xhci_pci ehci_hcd ohci_hcd xhci_hcd wmi vfio_pci irqbypass vfio_virqfd vfio_iommu_type1 vfio
[ 3205.332498] CR2: ffffc0e41744a000
[ 3205.335842] ---[ end trace 674fe974453f4cd5 ]---
[ 3205.340513] RIP: 0010:SHA512TransformBlocks+0x83/0x1370 [icp]
[ 3205.346303] Code: 48 8b 4f 10 48 8b 57 18 4c 8b 47 20 4c 8b 4f 28 4c 8b 57 30 4c 8b 5f 38 eb 0d 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 31 ff <4c> 8b 26 49 0f cc 4d 89 c5 4d 89 c6 4d 89 cf 49 c1 cd 0e 49 c1 ce
[ 3205.365194] RSP: 0018:ffffc0e383703680 EFLAGS: 00010246
[ 3205.370463] RAX: c03f909b159c913c RBX: b8f29d46f4625ecc RCX: e5935c1350dffdff
[ 3205.377646] RDX: 2a70b7ccd4a66abc RSI: ffffc0e41744a000 RDI: 0000000000000000
[ 3205.384830] RBP: ffffffffc0f18140 R08: 9d4433f507e7db20 R09: 38cb58c21f8e43d6
[ 3205.392012] R10: d1b1f2448d8bf85d R11: a8b9740da686f405 R12: 7d0f5ddafd42dc4a
[ 3205.399195] R13: ed9c9d6a52f30256 R14: 4ac22b5ed7cffd0f R15: 48800954c44eb109
[ 3205.406388] FS: 0000000000000000(0000) GS:ffffa31f96d00000(0000) knlGS:0000000000000000
[ 3205.414541] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3205.420331] CR2: ffffc0e41744a000 CR3: 0000000354f54000 CR4: 00000000000406e0
[ 3205.427514] Kernel panic - not syncing: Fatal exception
[ 3205.432791] Kernel Offset: 0x19000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 3205.443646] ---[ end Kernel panic - not syncing: Fatal exception ]---