in case anyone's interested, the upstream fix is:
commit c4f9c701f9b44299e6adbc58d1a4bb2c40383494
Author: Huang Ying <ying.huang@intel.com>
Date: Thu Oct 15 20:06:07 2020 -0700
mm: fix a race during THP splitting
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https://bugs.launchpad.net/bugs/1800509
Title:
unable to handle kernel NULL pointer dereference at 0000000000000007
Status in linux package in Ubuntu:
Expired
Bug description:
```Oct 29 13:51:25 vs09 kernel: [201179.645520] BUG: unable to handle kernel NULL pointer dereference at 0000000000000007
Oct 29 13:51:25 vs09 kernel: [201179.645601] IP: split_swap_cluster+0x4f/0x70
Oct 29 13:51:25 vs09 kernel: [201179.645633] PGD 0 P4D 0
Oct 29 13:51:25 vs09 kernel: [201179.645660] Oops: 0002 [#1] SMP PTI
Oct 29 13:51:25 vs09 kernel: [201179.645689] Modules linked in: vhost_net vhost tap xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp intel_cstate ipmi_ssif joydev input_leds intel_rapl_perf bridge stp llc mei_me lpc_ich mei ioatdma shpchp ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter acpi_pad mac_hid kvm_intel kvm irqbypass ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi sunrpc autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov
Oct 29 13:51:25 vs09 kernel: [201179.646180] async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ast crct10dif_pclmul hid_generic crc32_pclmul ttm ghash_clmulni_intel pcbc drm_kms_helper usbhid syscopyarea igb sysfillrect aesni_intel sysimgblt dca aes_x86_64 crypto_simd fb_sys_fops glue_helper i2c_algo_bit ahci ptp drm mxm_wmi hid cryptd libahci pps_core wmi
Oct 29 13:51:25 vs09 kernel: [201179.646418] CPU: 15 PID: 4321 Comm: qemu-system-x86 Not tainted 4.15.0-38-generic #41~16.04.1-Ubuntu
Oct 29 13:51:25 vs09 kernel: [201179.646478] Hardware name: Supermicro SYS-6028R-TR/X10DRi, BIOS 2.1 09/13/2016
Oct 29 13:51:25 vs09 kernel: [201179.646531] RIP: 0010:split_swap_cluster+0x4f/0x70
Oct 29 13:51:25 vs09 kernel: [201179.646567] RSP: 0018:ffffa9c9f77e3398 EFLAGS: 00010246
Oct 29 13:51:25 vs09 kernel: [201179.646606] RAX: 0000000000000000 RBX: 0000000000064566 RCX: 0000000000064566
Oct 29 13:51:25 vs09 kernel: [201179.646655] RDX: ffffa9c9a0001000 RSI: 0000000005cc5fff RDI: 0000000000064566
Oct 29 13:51:25 vs09 kernel: [201179.646703] RBP: ffffa9c9f77e33a0 R08: 0000000000000001 R09: ffff9140bffd4d00
Oct 29 13:51:25 vs09 kernel: [201179.646752] R10: ffff9140bffd4000 R11: 0000000000000001 R12: ffffe5fdb3178000
Oct 29 13:51:25 vs09 kernel: [201179.646800] R13: ffffe5fdb3178080 R14: ffffe5fdb3180000 R15: ffffe5fdb3178040
Oct 29 13:51:25 vs09 kernel: [201179.646850] FS: 00007fb2a27fc700(0000) GS:ffff913fbee40000(0000) knlGS:0000000000000000
Oct 29 13:51:25 vs09 kernel: [201179.646905] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Oct 29 13:51:25 vs09 kernel: [201179.646946] CR2: 0000000000000007 CR3: 0000003f691b4006 CR4: 00000000003626e0
Oct 29 13:51:25 vs09 kernel: [201179.646995] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Oct 29 13:51:25 vs09 kernel: [201179.647043] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Oct 29 13:51:25 vs09 kernel: [201179.647091] Call Trace:
Oct 29 13:51:25 vs09 kernel: [201179.647119] split_huge_page_to_list+0x76e/0x7f0
Oct 29 13:51:25 vs09 kernel: [201179.647156] deferred_split_scan+0x177/0x2d0
Oct 29 13:51:25 vs09 kernel: [201179.647191] shrink_slab.part.50+0x20b/0x440
Oct 29 13:51:25 vs09 kernel: [201179.647226] shrink_node+0x2fc/0x310
Oct 29 13:51:25 vs09 kernel: [201179.647257] do_try_to_free_pages+0xee/0x360
Oct 29 13:51:25 vs09 kernel: [201179.647290] try_to_free_pages+0xf1/0x1c0
Oct 29 13:51:25 vs09 kernel: [201179.647324] __alloc_pages_slowpath+0x405/0xec0
Oct 29 13:51:25 vs09 kernel: [201179.647362] __alloc_pages_nodemask+0x265/0x280
Oct 29 13:51:25 vs09 kernel: [201179.647399] alloc_pages_vma+0x165/0x1e0
Oct 29 13:51:25 vs09 kernel: [201179.647431] do_huge_pmd_anonymous_page+0x167/0x710
Oct 29 13:51:25 vs09 kernel: [201179.647469] __handle_mm_fault+0xb1d/0x11e0
Oct 29 13:51:25 vs09 kernel: [201179.647504] handle_mm_fault+0xcc/0x1c0
Oct 29 13:51:25 vs09 kernel: [201179.647535] __get_user_pages+0x11d/0x6d0
Oct 29 13:51:25 vs09 kernel: [201179.647568] get_user_pages+0x42/0x50
Oct 29 13:51:25 vs09 kernel: [201179.647627] __gfn_to_pfn_memslot+0x18b/0x3b0 [kvm]
Oct 29 13:51:25 vs09 kernel: [201179.647691] try_async_pf+0x66/0x220 [kvm]
Oct 29 13:51:25 vs09 kernel: [201179.649238] tdp_page_fault+0x12d/0x290 [kvm]
Oct 29 13:51:25 vs09 kernel: [201179.650766] ? vmexit_fill_RSB+0x10/0x40 [kvm_intel]
Oct 29 13:51:25 vs09 kernel: [201179.652323] kvm_mmu_page_fault+0x62/0x170 [kvm]
Oct 29 13:51:25 vs09 kernel: [201179.653835] handle_ept_violation+0xae/0x140 [kvm_intel]
Oct 29 13:51:25 vs09 kernel: [201179.655337] vmx_handle_exit+0xb3/0xcd0 [kvm_intel]
Oct 29 13:51:25 vs09 kernel: [201179.656844] ? vmx_vcpu_run+0x418/0x5e0 [kvm_intel]
Oct 29 13:51:25 vs09 kernel: [201179.658374] vcpu_enter_guest+0x451/0x1270 [kvm]
Oct 29 13:51:25 vs09 kernel: [201179.659869] kvm_arch_vcpu_ioctl_run+0x270/0x3d0 [kvm]
Oct 29 13:51:25 vs09 kernel: [201179.661323] ? kvm_arch_vcpu_ioctl_run+0x270/0x3d0 [kvm]
Oct 29 13:51:25 vs09 kernel: [201179.662743] kvm_vcpu_ioctl+0x33a/0x610 [kvm]
Oct 29 13:51:25 vs09 kernel: [201179.664105] do_vfs_ioctl+0xa4/0x600
Oct 29 13:51:25 vs09 kernel: [201179.665415] ? _cond_resched+0x1a/0x50
Oct 29 13:51:25 vs09 kernel: [201179.666679] SyS_ioctl+0x79/0x90
Oct 29 13:51:25 vs09 kernel: [201179.667893] ? exit_to_usermode_loop+0xa5/0xd0
Oct 29 13:51:25 vs09 kernel: [201179.669072] do_syscall_64+0x73/0x130
Oct 29 13:51:25 vs09 kernel: [201179.670201] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Oct 29 13:51:25 vs09 kernel: [201179.671298] RIP: 0033:0x7fb36a80bf47
Oct 29 13:51:25 vs09 kernel: [201179.672350] RSP: 002b:00007fb2a27fb978 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
Oct 29 13:51:25 vs09 kernel: [201179.673419] RAX: ffffffffffffffda RBX: 00007fb36fa46001 RCX: 00007fb36a80bf47
Oct 29 13:51:25 vs09 kernel: [201179.674484] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000049
Oct 29 13:51:25 vs09 kernel: [201179.675555] RBP: 0000000000000001 R08: 00005610fcebe8f0 R09: 0000000000000001
Oct 29 13:51:25 vs09 kernel: [201179.676609] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
Oct 29 13:51:25 vs09 kernel: [201179.677662] R13: 00005610fcea8f80 R14: 00007fb36fa45000 R15: 00005610ffbb3c40
Oct 29 13:51:25 vs09 kernel: [201179.678718] Code: c1 e3 07 48 c1 eb 10 48 8d 1c d8 48 89 df e8 d9 68 77 00 80 63 07 fb 48 85 db 74 17 48 89 df c6 07 00 0f 1f 40 00 31 c0 5b 5d c3 <80> 24 25 07 00 00 00 fb 31 c0 5b 5d c3 b8 f0 ff ff ff eb e9 0f
Oct 29 13:51:25 vs09 kernel: [201179.681026] RIP: split_swap_cluster+0x4f/0x70 RSP: ffffa9c9f77e3398
Oct 29 13:51:25 vs09 kernel: [201179.682157] CR2: 0000000000000007
Oct 29 13:51:25 vs09 kernel: [201179.683269] ---[ end trace 79264fc2c2b01079 ]---
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Oct 29 14:54 seq
crw-rw---- 1 root audio 116, 33 Oct 29 14:54 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=/dev/mapper/vs09--vg-swap
InstallationDate: Installed on 2017-01-25 (642 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IwConfig: Error: [Errno 2] No such file or directory
MachineType: Supermicro SYS-6028R-TR
Package: linux (not installed)
PciMultimedia:
ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-38-generic root=/dev/mapper/hostname--vg-root ro
ProcVersionSignature: Ubuntu 4.15.0-38.41~16.04.1-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-38-generic N/A
linux-backports-modules-4.15.0-38-generic N/A
linux-firmware 1.157.20
RfKill: Error: [Errno 2] No such file or directory
Tags: xenial
Uname: Linux 4.15.0-38-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
WifiSyslog:
_MarkForUpload: True
dmi.bios.date: 09/13/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2.1
dmi.board.asset.tag: Default string
dmi.board.name: X10DRi
dmi.board.vendor: Supermicro
dmi.board.version: 1.02B
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 1
dmi.chassis.vendor: Supermicro
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.1:bd09/13/2016:svnSupermicro:pnSYS-6028R-TR:pvr123456789:rvnSupermicro:rnX10DRi:rvr1.02B:cvnSupermicro:ct1:cvrDefaultstring:
dmi.product.family: SMC X10
dmi.product.name: SYS-6028R-TR
dmi.product.version: 123456789
dmi.sys.vendor: Supermicro
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Oct 29 14:54 seq
crw-rw---- 1 root audio 116, 33 Oct 29 14:54 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=/dev/mapper/vs09--vg-swap
InstallationDate: Installed on 2017-01-25 (642 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IwConfig: Error: [Errno 2] No such file or directory
MachineType: Supermicro SYS-6028R-TR
Package: linux (not installed)
PciMultimedia:
ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-38-generic root=/dev/mapper/hostname--vg-root ro
ProcVersionSignature: Ubuntu 4.15.0-38.41~16.04.1-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-38-generic N/A
linux-backports-modules-4.15.0-38-generic N/A
linux-firmware 1.157.20
RfKill: Error: [Errno 2] No such file or directory
Tags: xenial
Uname: Linux 4.15.0-38-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
WifiSyslog:
_MarkForUpload: True
dmi.bios.date: 09/13/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2.1
dmi.board.asset.tag: Default string
dmi.board.name: X10DRi
dmi.board.vendor: Supermicro
dmi.board.version: 1.02B
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 1
dmi.chassis.vendor: Supermicro
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.1:bd09/13/2016:svnSupermicro:pnSYS-6028R-TR:pvr123456789:rvnSupermicro:rnX10DRi:rvr1.02B:cvnSupermicro:ct1:cvrDefaultstring:
dmi.product.family: SMC X10
dmi.product.name: SYS-6028R-TR
dmi.product.version: 123456789
dmi.sys.vendor: Supermicro
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Oct 29 14:54 seq
crw-rw---- 1 root audio 116, 33 Oct 29 14:54 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=/dev/mapper/vs09--vg-swap
InstallationDate: Installed on 2017-01-25 (642 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IwConfig: Error: [Errno 2] No such file or directory
MachineType: Supermicro SYS-6028R-TR
Package: linux (not installed)
PciMultimedia:
ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-38-generic root=/dev/mapper/hostname--vg-root ro
ProcVersionSignature: Ubuntu 4.15.0-38.41~16.04.1-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-38-generic N/A
linux-backports-modules-4.15.0-38-generic N/A
linux-firmware 1.157.20
RfKill: Error: [Errno 2] No such file or directory
Tags: xenial
Uname: Linux 4.15.0-38-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
WifiSyslog:
_MarkForUpload: True
dmi.bios.date: 09/13/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2.1
dmi.board.asset.tag: Default string
dmi.board.name: X10DRi
dmi.board.vendor: Supermicro
dmi.board.version: 1.02B
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 1
dmi.chassis.vendor: Supermicro
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.1:bd09/13/2016:svnSupermicro:pnSYS-6028R-TR:pvr123456789:rvnSupermicro:rnX10DRi:rvr1.02B:cvnSupermicro:ct1:cvrDefaultstring:
dmi.product.family: SMC X10
dmi.product.name: SYS-6028R-TR
dmi.product.version: 123456789
dmi.sys.vendor: Supermicro
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Oct 29 14:54 seq
crw-rw---- 1 root audio 116, 33 Oct 29 14:54 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=/dev/mapper/vs09--vg-swap
InstallationDate: Installed on 2017-01-25 (642 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IwConfig: Error: [Errno 2] No such file or directory
MachineType: Supermicro SYS-6028R-TR
Package: linux (not installed)
PciMultimedia:
ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-38-generic root=/dev/mapper/hostname--vg-root ro
ProcVersionSignature: Ubuntu 4.15.0-38.41~16.04.1-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-38-generic N/A
linux-backports-modules-4.15.0-38-generic N/A
linux-firmware 1.157.20
RfKill: Error: [Errno 2] No such file or directory
Tags: xenial
Uname: Linux 4.15.0-38-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
WifiSyslog:
_MarkForUpload: True
dmi.bios.date: 09/13/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2.1
dmi.board.asset.tag: Default string
dmi.board.name: X10DRi
dmi.board.vendor: Supermicro
dmi.board.version: 1.02B
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 1
dmi.chassis.vendor: Supermicro
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.1:bd09/13/2016:svnSupermicro:pnSYS-6028R-TR:pvr123456789:rvnSupermicro:rnX10DRi:rvr1.02B:cvnSupermicro:ct1:cvrDefaultstring:
dmi.product.family: SMC X10
dmi.product.name: SYS-6028R-TR
dmi.product.version: 123456789
dmi.sys.vendor: Supermicro
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