Public bug reported:
tonight one of our systems run into the following panic
--
kernel NULL pointer dereference at 0000000000000000
kernel: [2468259.002689] IP: kvm_mmu_flush_or_zap+0x5/0x40 [kvm]
kernel: [2468259.007758] PGD 0 P4D 0
kernel: [2468259.010483] Oops: 0000 [#1] SMP PTI
kernel: [2468259.014161] Modules linked in: vhost_net vhost tap xt_nat
xt_REDIRECT nf_nat_redirect ip6table_mangle xt_mark xt_connmark xt_multiport
xt_set ip_set_hash_net ip_set xt_CT xt_mac veth vxlan ip6_udp_tunnel udp_tunnel
ip6table_raw xt_physdev xt_comment xt_CHECKSUM xt_tcpudp iptable_mangle
iptable_raw ebtable_filter ebtables nf_conntrack_netlink nfnetlink xfrm_user
xfrm_algo br_netfilter bridge aufs rbd libceph binfmt_misc 8021q garp mrp stp
llc bonding openvswitch nsh nf_conntrack_ipv6 nf_nat_ipv6 rdma_ucm(OE)
ib_ucm(OE) nf_defrag_ipv6 ib_ipoib(OE) ip6table_filter ib_umad(OE) xt_conntrack
mlx5_fpga_tools(OE) mlx5_ib(OE) ib_uverbs(OE) iptable_filter mlx4_ib(OE)
mlx4_en(OE) mlx4_core(OE) ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_addrtype
iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack
kernel: [2468259.085884] ip_tables ipmi_ssif intel_rapl skx_edac
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64
crypto_simd glue_helper dell_smbios dcdbas cryptd intel_cstate
dell_wmi_descriptor wmi_bmof intel_rapl_perf mei_me mei lpc_ich shpchp ipmi_si
ipmi_devintf ipmi_msghandler acpi_power_meter mac_hid rdma_cm(OE) iw_cm(OE)
ib_cm(OE) ib_core(OE) iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi
ip6_tables x_tables autofs4 mgag200 i2c_algo_bit ttm mlx5_core(OE) mlxfw(OE)
devlink drm_kms_helper syscopyarea sysfillrect bnx2x mlx_compat(OE) sysimgblt
ptp fb_sys_fops pps_core mdio drm libcrc32c ahci libahci wmi
kernel: [2468259.148257] CPU: 21 PID: 3455197 Comm: CPU 11/KVM Tainted: G
OE 4.15.0-55-generic #60~16.04.2-Ubuntu
kernel: [2468259.158712] Hardware name: Dell Inc. PowerEdge R640/0PHYDR, BIOS
2.2.10 05/15/2019
kernel: [2468259.166510] RIP: 0010:kvm_mmu_flush_or_zap+0x5/0x40 [kvm]
kernel: [2468259.172097] RSP: 0018:ffffad129f5b3ac8 EFLAGS: 00010246
kernel: [2468259.177514] RAX: 0000000000000000 RBX: ffff93dcbb5df5a8 RCX:
0000000000000000
kernel: [2468259.184840] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff940b7ff38000
kernel: [2468259.192168] RBP: ffffad129f5b3b30 R08: 0000000000000001 R09:
0000000000000000
kernel: [2468259.199495] R10: 0000000000000001 R11: 0000000000000781 R12:
ffff940b7ff38000
kernel: [2468259.206820] R13: 0000000000000000 R14: 0000000000000000 R15:
0000000000802800
kernel: [2468259.214151] FS: 00007f6de8ff9700(0000) GS:ffff9411ff280000(0000)
knlGS:ffff964c1f4c0000
kernel: [2468259.222431] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: [2468259.228369] CR2: 0000000000000000 CR3: 000000b54b6f8002 CR4:
00000000007626e0
kernel: [2468259.235694] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
kernel: [2468259.243018] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
kernel: [2468259.250348] PKRU: 55555554
kernel: [2468259.253245] Call Trace:
kernel: [2468259.255910] ? kvm_mmu_get_page+0x29a/0x6b0 [kvm]
kernel: [2468259.260814] __direct_map.part.124+0xf5/0x220 [kvm]
kernel: [2468259.265901] tdp_page_fault+0x264/0x290 [kvm]
kernel: [2468259.270462] kvm_mmu_page_fault+0x62/0x170 [kvm]
kernel: [2468259.275278] handle_ept_violation+0xae/0x140 [kvm_intel]
kernel: [2468259.280781] vmx_handle_exit+0xb3/0xcd0 [kvm_intel]
kernel: [2468259.285867] ? vmx_vcpu_run+0x41d/0x600 [kvm_intel]
kernel: [2468259.290960] vcpu_enter_guest+0x451/0x1280 [kvm]
kernel: [2468259.295774] ? vmx_sync_pir_to_irr+0x39/0x70 [kvm_intel]
kernel: [2468259.301307] kvm_arch_vcpu_ioctl_run+0x270/0x3d0 [kvm]
kernel: [2468259.306652] ? kvm_arch_vcpu_ioctl_run+0x270/0x3d0 [kvm]
kernel: [2468259.312163] kvm_vcpu_ioctl+0x33a/0x610 [kvm]
kernel: [2468259.317432] ? do_futex+0x10f/0x500
kernel: [2468259.321830] do_vfs_ioctl+0xa4/0x600
kernel: [2468259.326244] ? SyS_futex+0x7f/0x180
kernel: [2468259.330523] SyS_ioctl+0x79/0x90
kernel: [2468259.334561] do_syscall_64+0x73/0x130
kernel: [2468259.338992] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
kernel: [2468259.344817] RIP: 0033:0x7f6e379b2f47
kernel: [2468259.349187] RSP: 002b:00007f6de8ff88f8 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
kernel: [2468259.357529] RAX: ffffffffffffffda RBX: 000000000000ae80 RCX:
00007f6e379b2f47
kernel: [2468259.365415] RDX: 0000000000000000 RSI: 000000000000ae80 RDI:
000000000000002e
kernel: [2468259.373286] RBP: 000055e3147d6a40 R08: 000055e311e25810 R09:
0000000000000001
kernel: [2468259.381202] R10: 0000000000000046 R11: 0000000000000246 R12:
0000000000000000
kernel: [2468259.389103] R13: 00007f6e3c867000 R14: 0000000000000006 R15:
000055e3147d6a40
kernel: [2468259.396946] Code: 89 fa 4c 89 f6 e8 2c 8c e6 ef 49 8b 04 24 48 85
c0 75 dc e9 5b ff ff ff e8 f9 3c 2f ef 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00
00 <48> 8b 06 55 48 89 e5 48 39 c6 74 0a 48 8b 3f e8 17 e4 ff ff 5d
kernel: [2468259.417584] RIP: kvm_mmu_flush_or_zap+0x5/0x40 [kvm] RSP:
ffffad129f5b3ac8
kernel: [2468259.425169] CR2: 0000000000000000
kernel: [2468259.429178] ---[ end trace 9c847a79bd3858c9 ]---
--
# lsb_release -d
Description: Ubuntu 16.04.6 LTS
# uname -a
Linux hv15rp 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC
2019 x86_64 x86_64 x86_64 GNU/Linux
maybe someone is able to use this information to avoid such panics in
future.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
--
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https://bugs.launchpad.net/bugs/1842850
Title:
NULL pointer dereference in kvm_mmu_flush_or_zap
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