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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: eoan

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https://bugs.launchpad.net/bugs/1859958

Title:
  kvm clients receive lots auf segfaults

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Kubuntu 19.10 on a Z420 Workstation with 32GB ECC RAM / CPU E5-2690
  (v0)

  looks like the same problem as the redhat bug 
  https://bugzilla.redhat.com/show_bug.cgi?id=1738386

  symptoms are two different kernel WARNINGS; but kvm guests
  receive lots of segfaults; this is for windows oder linux guests
  even bluescreens happens:

  looks like it always happens on CPU 11; no syslog messages about bad ram (ecc 
errors)
  and memtest shows no bad ram:

  there a two types of warnings:

  journalctl | grep WARNING:.CPU
  Dec 17 20:53:22 XYZXYZ kernel: WARNING: CPU: 11 PID: 4391 at 
arch/x86/kvm/x86.c:8056 vcpu_enter_guest+0xd2b/0xf00 [kvm]
  Dec 23 23:10:40 XYZXYZ kernel: WARNING: CPU: 11 PID: 4391 at 
arch/x86/kernel/fpu/core.c:360 fpregs_assert_state_consistent+0x36/0x50
  Jan 04 09:35:35 XYZXYZ kernel: WARNING: CPU: 11 PID: 7357 at 
arch/x86/kvm/x86.c:8056 vcpu_enter_guest+0xd2b/0xf00 [kvm]
  Jan 06 20:21:16 XYZXYZ kernel: WARNING: CPU: 11 PID: 7357 at 
arch/x86/kernel/fpu/core.c:360 fpregs_assert_state_consistent+0x36/0x50
  Jan 16 09:26:22 XYZXYZ kernel: WARNING: CPU: 11 PID: 16621 at 
arch/x86/kvm/x86.c:8056 vcpu_enter_guest+0xd2b/0xf00 [kvm]

  # first type: vmlinuz-5.3.0-24-generic
  Dec 23 23:10:40 XYZXYZ kernel: WARNING: CPU: 11 PID: 4391 at 
arch/x86/kernel/fpu/core.c:360 fpregs_assert_state_consistent+0x36/0x50
  Dec 23 23:10:40 XYZXYZ kernel: Modules linked in: nls_utf8 isofs xt_policy 
chacha_x86_64 chacha_generic poly1305_x86_64 poly1305_generic chacha20poly1305 
vhost
  Dec 23 23:10:40 XYZXYZ kernel:  snd_seq_midi_emul snd_cmipci sb_edac 
snd_hda_codec snd_mpu401_uart snd_hda_core snd_opl3_lib x86_pkg_temp_thermal 
intel_powercl
  Dec 23 23:10:40 XYZXYZ kernel:  firewire_ohci isci vfio_pci ahci drm 
firewire_core vfio_virqfd e1000e libsas i2c_i801 libahci lpc_ich 
vfio_iommu_type1 crc_itu_
  Dec 23 23:10:40 XYZXYZ kernel: CPU: 11 PID: 4391 Comm: CPU 0/KVM Tainted: G   
     W         5.3.0-24-generic #26-Ubuntu
  Dec 23 23:10:40 XYZXYZ kernel: Hardware name: Hewlett-Packard HP Z420 
Workstation/1589, BIOS J61 v03.95 06/13/2019
  Dec 23 23:10:40 XYZXYZ kernel: RIP: 
0010:fpregs_assert_state_consistent+0x36/0x50
  Dec 23 23:10:40 XYZXYZ kernel: Code: 6b 01 00 48 8b 10 48 89 e5 80 e6 40 75 
1e 48 8d 90 80 13 00 00 65 8b 35 d8 25 bd 7a 65 48 8b 0c 25 40 6b 01 00 48 39 
d1 74 
  Dec 23 23:10:40 XYZXYZ kernel: RSP: 0018:ffffa4ad021fbd40 EFLAGS: 00010203
  Dec 23 23:10:40 XYZXYZ kernel: RAX: ffff8e92e33adc00 RBX: ffff8e92c7af8000 
RCX: 0000000000000000
  Dec 23 23:10:40 XYZXYZ kernel: RDX: ffff8e92e33aef80 RSI: 000000000000000b 
RDI: 00000000000001d9
  Dec 23 23:10:40 XYZXYZ kernel: RBP: ffffa4ad021fbd40 R08: ffff8e92c7b2d200 
R09: 0000000000000014
  Dec 23 23:10:40 XYZXYZ kernel: R10: ffff8e928863fbc0 R11: 0000000000000000 
R12: 000000000000000b
  Dec 23 23:10:40 XYZXYZ kernel: R13: 000000000000000b R14: ffff8e92c7af8058 
R15: ffff8e92c7af8000
  Dec 23 23:10:40 XYZXYZ kernel: FS:  00007f2b854bd700(0000) 
GS:ffff8e932fac0000(0000) knlGS:0000000000000000
  Dec 23 23:10:40 XYZXYZ kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
  Dec 23 23:10:40 XYZXYZ kernel: CR2: 0000000004400008 CR3: 00000007e6a44003 
CR4: 00000000000626e0
  Dec 23 23:10:40 XYZXYZ kernel: Call Trace:
  Dec 23 23:10:40 XYZXYZ kernel:  kvm_arch_vcpu_load+0x6f/0x290 [kvm]
  Dec 23 23:10:40 XYZXYZ kernel:  vcpu_load+0x2c/0x40 [kvm]
  Dec 23 23:10:40 XYZXYZ kernel:  kvm_arch_vcpu_ioctl_run+0x1b/0x590 [kvm]
  Dec 23 23:10:40 XYZXYZ kernel:  kvm_vcpu_ioctl+0x24b/0x610 [kvm]
  Dec 23 23:10:40 XYZXYZ kernel:  ? __seccomp_filter+0x7e/0x680
  Dec 23 23:10:40 XYZXYZ kernel:  ? futex_wake+0x8b/0x190
  Dec 23 23:10:40 XYZXYZ kernel:  do_vfs_ioctl+0x407/0x670
  Dec 23 23:10:40 XYZXYZ kernel:  ? __secure_computing+0x42/0xe0
  Dec 23 23:10:40 XYZXYZ kernel:  ksys_ioctl+0x67/0x90
  Dec 23 23:10:40 XYZXYZ kernel:  __x64_sys_ioctl+0x1a/0x20
  Dec 23 23:10:40 XYZXYZ kernel:  do_syscall_64+0x5a/0x130
  Dec 23 23:10:40 XYZXYZ kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
  Dec 23 23:10:40 XYZXYZ kernel: RIP: 0033:0x7f2b87ae667b
  Dec 23 23:10:40 XYZXYZ kernel: Code: 0f 1e fa 48 8b 05 15 28 0d 00 64 c7 00 
26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 
00 0f 
  Dec 23 23:10:40 XYZXYZ kernel: RSP: 002b:00007f2b854bc5f8 EFLAGS: 00000246 
ORIG_RAX: 0000000000000010
  Dec 23 23:10:40 XYZXYZ kernel: RAX: ffffffffffffffda RBX: 000000000000ae80 
RCX: 00007f2b87ae667b
  Dec 23 23:10:40 XYZXYZ kernel: RDX: 0000000000000000 RSI: 000000000000ae80 
RDI: 0000000000000014
  Dec 23 23:10:40 XYZXYZ kernel: RBP: 000055712b5fde30 R08: 000055712add7e70 
R09: 00007f2b854bc408
  Dec 23 23:10:40 XYZXYZ kernel: R10: 0000000000000001 R11: 0000000000000246 
R12: 0000000000000000
  Dec 23 23:10:40 XYZXYZ kernel: R13: 0000000000000000 R14: 0000000000000000 
R15: 000055712b2aefc0
  Dec 23 23:10:40 XYZXYZ kernel: ---[ end trace ff86a0de4ef2e512 ]---

  # second type: vmlinuz-5.3.0-26-generic
  Jan 16 09:26:22 XYZXYZ kernel: WARNING: CPU: 11 PID: 16621 at 
arch/x86/kvm/x86.c:8056 vcpu_enter_guest+0xd2b/0xf00 [kvm]
  Jan 16 09:26:22 XYZXYZ kernel: Modules linked in: vhost_net vhost tap 
xt_policy chacha_x86_64 chacha_generic poly1305_x86_64 poly1305_generic 
chacha20poly1305†
  Jan 16 09:26:22 XYZXYZ kernel:  intel_rapl_common snd_hda_intel snd_cmipci 
snd_hda_codec sb_edac snd_mpu401_uart snd_opl3_lib snd_hda_core 
x86_pkg_temp_thermal
  Jan 16 09:26:22 XYZXYZ kernel:  ahci vfio_pci drm firewire_core libsas 
libahci e1000e vfio_virqfd lpc_ich i2c_i801 crc_itu_t vfio_iommu_type1 r8169 
scsi_transp
  Jan 16 09:26:22 XYZXYZ kernel: CPU: 11 PID: 16621 Comm: CPU 0/KVM Not tainted 
5.3.0-26-generic #28-Ubuntu
  Jan 16 09:26:22 XYZXYZ kernel: Hardware name: Hewlett-Packard HP Z420 
Workstation/1589, BIOS J61 v03.95 06/13/2019
  Jan 16 09:26:22 XYZXYZ kernel: RIP: 0010:vcpu_enter_guest+0xd2b/0xf00 [kvm]
  Jan 16 09:26:22 XYZXYZ kernel: Code: 00 e8 19 45 13 ce 66 90 bf 06 00 00 00 
49 8b b4 24 88 26 00 00 e8 05 45 13 ce 66 90 41 83 a4 24 60 26 00 00 fb e9 d7 
f5 ff 
  Jan 16 09:26:22 XYZXYZ kernel: RSP: 0018:ffffa2de41c3fd30 EFLAGS: 00010002
  Jan 16 09:26:22 XYZXYZ kernel: RAX: 0000000000004b20 RBX: ffff8cde41292e00 
RCX: ffff8cde41ae8000
  Jan 16 09:26:22 XYZXYZ kernel: RDX: 0000000000000000 RSI: 0000000000000001 
RDI: 0000000000000000
  Jan 16 09:26:22 XYZXYZ kernel: RBP: ffffa2de41c3fd90 R08: 0000000000000001 
R09: 0000000000000000
  Jan 16 09:26:22 XYZXYZ kernel: R10: 0000000000000000 R11: 0000000000000000 
R12: ffff8cde41938000
  Jan 16 09:26:22 XYZXYZ kernel: R13: 0000000000000000 R14: ffffa2de439ba2e8 
R15: ffff8cde41938000
  Jan 16 09:26:22 XYZXYZ kernel: FS:  00007fcf262ed700(0000) 
GS:ffff8cdfafac0000(0000) knlGS:0000000000000000
  Jan 16 09:26:22 XYZXYZ kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
  Jan 16 09:26:22 XYZXYZ kernel: CR2: 0000000072a34fba CR3: 00000006c0e6a002 
CR4: 00000000000626e0
  Jan 16 09:26:22 XYZXYZ kernel: Call Trace:
  Jan 16 09:26:22 XYZXYZ kernel:  kvm_arch_vcpu_ioctl_run+0x125/0x590 [kvm]
  Jan 16 09:26:22 XYZXYZ kernel:  kvm_vcpu_ioctl+0x24b/0x610 [kvm]
  Jan 16 09:26:22 XYZXYZ kernel:  ? __seccomp_filter+0x7e/0x680
  Jan 16 09:26:22 XYZXYZ kernel:  ? futex_wake+0x8b/0x190
  Jan 16 09:26:22 XYZXYZ kernel:  do_vfs_ioctl+0x407/0x670
  Jan 16 09:26:22 XYZXYZ kernel:  ? __secure_computing+0x42/0xe0
  Jan 16 09:26:22 XYZXYZ kernel:  ksys_ioctl+0x67/0x90
  Jan 16 09:26:22 XYZXYZ kernel:  __x64_sys_ioctl+0x1a/0x20
  Jan 16 09:26:22 XYZXYZ kernel:  do_syscall_64+0x5a/0x130
  Jan 16 09:26:22 XYZXYZ kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
  Jan 16 09:26:22 XYZXYZ kernel: RIP: 0033:0x7fcf2f5d667b
  Jan 16 09:26:22 XYZXYZ kernel: Code: 0f 1e fa 48 8b 05 15 28 0d 00 64 c7 00 
26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 
00 0f 
  Jan 16 09:26:22 XYZXYZ kernel: RSP: 002b:00007fcf262ec5f8 EFLAGS: 00000246 
ORIG_RAX: 0000000000000010
  Jan 16 09:26:22 XYZXYZ kernel: RAX: ffffffffffffffda RBX: 000000000000ae80 
RCX: 00007fcf2f5d667b
  Jan 16 09:26:22 XYZXYZ kernel: RDX: 0000000000000000 RSI: 000000000000ae80 
RDI: 0000000000000013
  Jan 16 09:26:22 XYZXYZ kernel: RBP: 000055a760717360 R08: 000055a75f6b6e70 
R09: 00007fcf262ec408
  Jan 16 09:26:22 XYZXYZ kernel: R10: 0000000000000001 R11: 0000000000000246 
R12: 0000000000000000
  Jan 16 09:26:22 XYZXYZ kernel: R13: 0000000000000000 R14: 0000000000000000 
R15: 000055a75fb8dfc0
  Jan 16 09:26:22 XYZXYZ kernel: ---[ end trace efb2bc998e45eb42 ]---

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