Public bug reported:
When starting a nested VM in a Bionic VM, the "host" VM kernel panics
following a simple drop to QEMU monitor by hitting <Ctrl>A-c. For some
reason kdump is unable to capture the kernel panic so I only have a
screen capture of the panic.
It also happens on the latest mainline kernel(4.18-rc4). It is fairly
trivial to reproduce. In a Bionic VM, install qemu & ovmf and run the
following :
qemu-system-x86_64 -enable-kvm \
-name balloontest \
-display none \
-monitor none \
-nographic \
-nodefaults \
-m 2048M \
-serial mon:stdio \
-smp 2 \
-cpu host \
-drive
if=pflash,format=raw,readonly,file=/usr/share/OVMF/OVMF_CODE.fd \
-drive
if=pflash,format=raw,file=/home/caribou/balloon/efi.vars
Use <Ctrl>A-c to drop to QEMU monitor and <quit>.
^[]0;/opt/ocs/gotty-serial/nolp-cli^G^[]2;Loading...^G^[]2;avogadro^G[
267.784299] general protection fault: 0000 [#1] SMP PTI
[ 267.785834] Modules linked in: nf_conntrack_netlink nfnetlink xfrm_user
xfrm_algo xt_addrtype ip6t_MASQUERADE nf_nat_masquerade_ipv6 ip6table_nat
nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_filter i>
[ 267.804312] xor raid6_pq libcrc32c raid1 raid0 multipath linear floppy
aesni_intel pata_acpi aes_x86_64 crypto_simd cryptd glue_helper psmouse
i2c_piix4 virtio_net virtio_blk
[ 267.807946] CPU: 6 PID: 0 Comm: swapper/6 Not tainted 4.15.0-24-generic
#26-Ubuntu
[ 267.809710] Hardware name: Scaleway Standard PC (i440FX + PIIX, 1996), BIOS
0.0.0 02/06/2015
[ 267.811666] RIP: 0010:native_write_cr4+0x4/0x10
[ 267.812727] RSP: 0018:ffff8c01ffd83f48 EFLAGS: 00010006
[ 267.813960] RAX: 00000000003626e0 RBX: 0000000000000046 RCX: ffff8c01ffd80000
[ 267.815582] RDX: ffff8c01ffd94020 RSI: ffff8c01ffda5040 RDI: 00000000003606e0
[ 267.817095] RBP: ffff8c01ffd83f48 R08: 000000478079a547 R09: 0000000000000000
[ 267.818625] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000025040
[ 267.820130] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
[ 267.821638] FS: 0000000000000000(0000) GS:ffff8c01ffd80000(0000)
knlGS:0000000000000000
[ 267.823352] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 267.824592] CR2: 0000000000000000 CR3: 000000058c00a006 CR4: 00000000003626e0
[ 267.826108] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 267.827567] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 267.828973] Call Trace:
[ 267.829470] <IRQ>
[ 267.829893] hardware_disable+0xaa/0xc0 [kvm_intel]
[ 267.830897] kvm_arch_hardware_disable+0x19/0x40 [kvm]
[ 267.831928] hardware_disable_nolock+0x2b/0x30 [kvm]
[ 267.832912] flush_smp_call_function_queue+0x4c/0xf0
[ 267.833911] generic_smp_call_function_single_interrupt+0x13/0x30
[ 267.835121] smp_call_function_interrupt+0x36/0xd0
[ 267.836069] call_function_interrupt+0x84/0x90
[ 267.836950] </IRQ>
[ 267.837396] RIP: 0010:native_safe_halt+0x6/0x10
[ 267.838272] RSP: 0018:ffffa2e1431afe80 EFLAGS: 00000246 ORIG_RAX:
ffffffffffffff03
[ 267.839698] RAX: ffffffffacd97150 RBX: 0000000000000006 RCX: 0000000000000000
[ 267.840978] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 267.842258] RBP: ffffa2e1431afe80 R08: 0000000000000002 R09: 0000000000000000
[ 267.843554] R10: 00000000000000b3 R11: 00000000000000a6 R12: 0000000000000006
[ 267.844826] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 267.846107] ? __cpuidle_text_start+0x8/0x8
[ 267.846875] default_idle+0x20/0x100
[ 267.847533] arch_cpu_idle+0x15/0x20
[ 267.848186] default_idle_call+0x23/0x30
[ 267.848917] do_idle+0x172/0x1f0
[ 267.849516] cpu_startup_entry+0x73/0x80
[ 267.850255] start_secondary+0x1ab/0x200
[ 267.850971] secondary_startup_64+0xa5/0xb0
[ 267.851700] Code: 0f 1f 80 00 00 00 00 55 48 89 e5 0f 20 d8 5d c3 0f 1f 80
00 00 00 00 55 48 89 e5 0f 22 df 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 <0f> 22
e7 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 44 0f 20 c0>
[ 267.854894] RIP: native_write_cr4+0x4/0x10 RSP: ffff8c01ffd83f48
[ 268.848104] invalid opcode: 0000 [#2] SMP PTI
[ 268.848524] Modules linked in: nf_conntrack_netlink nfnetlink xfrm_user
xfrm_algo xt_addrtype ip6t_MASQUERADE nf_nat_masquerade_ipv6 ip6table_nat
nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_filter i>
[ 268.854013] xor raid6_pq libcrc32c raid1 raid0 multipath linear floppy
aesni_intel pata_acpi aes_x86_64 crypto_simd cryptd glue_helper psmouse
i2c_piix4 virtio_net virtio_blk
[ 268.855212] CPU: 6 PID: 0 Comm: swapper/6 Not tainted 4.15.0-24-generic
#26-Ubuntu
[ 268.855790] Hardware name: Scaleway Standard PC (i440FX + PIIX, 1996), BIOS
0.0.0 02/06/2015
[ 268.856438] RIP: 0010:native_machine_crash_shutdown+0x136/0x190
[ 268.856893] RSP: 0018:ffff8c01ffd83cc0 EFLAGS: 00010002
[ 268.857295] RAX: 00000000003626e0 RBX: ffff8c01ffd83d28 RCX: 00000000fffa3223
[ 268.857837] RDX: 000000000f8bfbff RSI: ffff8c01ffd83cc8 RDI: ffff8c01ffd83cc4
[ 268.858426] RBP: ffff8c01ffd83cf0 R08: ffff8c01ffd83ccc R09: ffff8c01ffd83cd0
[ 268.859029] R10: ffffffffada5d660 R11: ffff8c01ffd83c7c R12: 000000000000000b
[ 268.859573] R13: ffff8c01ffd83e98 R14: 0000000000000000 R15: 0000000000000000
[ 268.860117] FS: 0000000000000000(0000) GS:ffff8c01ffd80000(0000)
knlGS:0000000000000000
[ 268.860735] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 268.861177] CR2: 0000000000000000 CR3: 000000058c00a006 CR4: 00000000003626e0
[ 268.861724] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 268.862268] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 268.862820] Call Trace:
[ 268.863016] <IRQ>
[ 268.863181] kvm_crash_shutdown+0x26/0x50
[ 268.863520] machine_crash_shutdown+0x15/0x20
[ 268.863885] __crash_kexec+0x5d/0xa0
[ 268.864167] ? native_write_cr4+0x4/0x10
[ 268.864473] crash_kexec+0x41/0x60
[ 268.864739] oops_end+0xa8/0xd0
[ 268.864985] die+0x42/0x50
[ 268.865203] do_general_protection+0x9d/0x180
[ 268.865542] general_protection+0x25/0x50
[ 268.865855] RIP: 0010:native_write_cr4+0x4/0x10
[ 268.866204] RSP: 0018:ffff8c01ffd83f48 EFLAGS: 00010006
[ 268.866610] RAX: 00000000003626e0 RBX: 0000000000000046 RCX: ffff8c01ffd80000
[ 268.867152] RDX: ffff8c01ffd94020 RSI: ffff8c01ffda5040 RDI: 00000000003606e0
[ 268.867711] RBP: ffff8c01ffd83f48 R08: 000000478079a547 R09: 0000000000000000
[ 268.868294] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000025040
[ 268.868885] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
[ 268.869433] hardware_disable+0xaa/0xc0 [kvm_intel]
[ 268.869825] kvm_arch_hardware_disable+0x19/0x40 [kvm]
[ 268.870231] hardware_disable_nolock+0x2b/0x30 [kvm]
[ 268.870620] flush_smp_call_function_queue+0x4c/0xf0
[ 268.871003] generic_smp_call_function_single_interrupt+0x13/0x30
[ 268.871470] smp_call_function_interrupt+0x36/0xd0
[ 268.871839] call_function_interrupt+0x84/0x90
[ 268.872181] </IRQ>
[ 268.872351] RIP: 0010:native_safe_halt+0x6/0x10
[ 268.872699] RSP: 0018:ffffa2e1431afe80 EFLAGS: 00000246 ORIG_RAX:
ffffffffffffff03
[ 268.873271] RAX: ffffffffacd97150 RBX: 0000000000000006 RCX: 0000000000000000
[ 268.873870] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 268.874414] RBP: ffffa2e1431afe80 R08: 0000000000000002 R09: 0000000000000000
[ 268.874965] R10: 00000000000000b3 R11: 00000000000000a6 R12: 0000000000000006
[ 268.875506] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 268.876048] ? __cpuidle_text_start+0x8/0x8
[ 268.876373] default_idle+0x20/0x100
[ 268.876654] arch_cpu_idle+0x15/0x20
[ 268.876934] default_idle_call+0x23/0x30
[ 268.877242] do_idle+0x172/0x1f0
[ 268.877496] cpu_startup_entry+0x73/0x80
[ 268.877804] start_secondary+0x1ab/0x200
[ 268.878133] secondary_startup_64+0xa5/0xb0
[ 268.878504] Code: 66 90 48 89 c6 48 c1 e8 20 4c 89 e7 81 e6 ff ef ff ff 48
89 c2 e8 6b 78 00 00 66 90 e9 65 ff ff ff e8 ff fc ff ff e9 01 ff ff ff <0f> 01
c4 9c 58 0f 1f 44 00 00 49 89 c4 fa 66 0f 1f 44 00 00>
[ 268.879993] RIP: native_machine_crash_shutdown+0x136/0x190 RSP:
ffff8c01ffd83cc0
[ 268.880555] ---[ end trace 636e271a8cdb116f ]---
[ 268.880912] Kernel panic - not syncing: Fatal exception in interrupt
[ 269.951244] Shutting down cpus with NMI
[ 269.962128] Kernel Offset: 0x2b400000 from 0xffffffff81000000 (relocation
range: 0xffffffff80000000-0xffffffffbfffffff)
[ 269.963488] ---[ end Kernel panic - not syncing: Fatal exception in interrupt
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: bionic
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https://bugs.launchpad.net/bugs/1780817
Title:
kernel panic in nested VM with latest 4.15 kernel (4.15.0-24-generic)
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