Comment 7 for bug 1712831

Installed requested mainline in my autopkgtest environment created as described above.
Booting correctly by default and verified to boot into this by default.

Now kicking the autopkgtest that was hanging before, but still running into the crash.
On the serial console (connect as described above) it pups up very similar than before:

[ 36.480026] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 36.480873] IP: add_grec+0x28/0x440
[ 36.481301] *pdpt = 000000001d25b001 *pde = 0000000000000000
[ 36.481302]
[ 36.482198] Oops: 0000 [#1] SMP
[ 36.482590] Modules linked in: veth openvswitch nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat nf_conntrack libcrc32c 9p fscache ppdev kvm_intel kvm irqbypass input_leds 9pnet_virtio 9pnet joydev serio_raw i2c_piix4 parport_pc mac_hid parport qemu_fw_cfg ip_tables x_tables autofs4 btrfs xor raid6_pq psmouse floppy virtio_blk virtio_net pata_acpi
[ 36.486878] CPU: 0 PID: 2173 Comm: systemd-udevd Tainted: G W 4.13.0-041300rc6-generic #201708201831
[ 36.488220] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.1-1ubuntu1~cloud0 04/01/2014
[ 36.489414] task: db04eb40 task.stack: dd274000
[ 36.489988] EIP: add_grec+0x28/0x440
[ 36.490470] EFLAGS: 00010202 CPU: 0
[ 36.490912] EAX: 00000000 EBX: dd1bbd20 ECX: 00000006 EDX: dd1bbd20
[ 36.491682] ESI: dd1ef500 EDI: dd1ef500 EBP: dbcc5f30 ESP: dbcc5ef0
[ 36.492450] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[ 36.493135] CR0: 80050033 CR2: 00000000 CR3: 1e123640 CR4: 000006f0
[ 36.493917] Call Trace:
[ 36.494224] <SOFTIRQ>
[ 36.494526] mld_ifc_timer_expire+0xfe/0x250
[ 36.495066] ? mld_dad_timer_expire+0x50/0x50
[ 36.495616] call_timer_fn+0x30/0x120
[ 36.496070] ? mld_dad_timer_expire+0x50/0x50
[ 36.496612] ? mld_dad_timer_expire+0x50/0x50
[ 36.497144] run_timer_softirq+0x3c5/0x420
[ 36.497685] ? __softirqentry_text_start+0x8/0x8
[ 36.498259] __do_softirq+0xa9/0x245
[ 36.498717] ? __softirqentry_text_start+0x8/0x8
[ 36.499286] do_softirq_own_stack+0x24/0x30
[ 36.499797] </SOFTIRQ>
[ 36.500110] irq_exit+0xad/0xb0
[ 36.500516] smp_apic_timer_interrupt+0x38/0x50
[ 36.501101] apic_timer_interrupt+0x39/0x40
[ 36.501623] EIP: 0x469ba7
[ 36.501948] EFLAGS: 00000292 CPU: 0
[ 36.502385] EAX: bfa2e000 EBX: 004a8bf4 ECX: 00000030 EDX: 0047f836
[ 36.503157] ESI: bfa2e09c EDI: bfa2e000 EBP: bfa2f0b8 ESP: bfa2dff4
[ 36.503923] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[ 36.504606] Code: 00 00 00 3e 8d 74 26 00 55 89 e5 57 56 53 89 c6 83 ec 34 89 4d e8 65 a1 14 00 00 00 89 45 f0 31 c0 8b 42 10 f6 42 48 08 89 45 cc <8b> 00 c7 45 ec 00 00 00 00 89 45 c8 89 f0 0f 85 b4 02 00 00 8b
[ 36.506481] EIP: add_grec+0x28/0x440 SS:ESP: 0068:dbcc5ef0
[ 36.507009] CR2: 0000000000000000
[ 36.507330] ---[ end trace f0cddc0c09ae15d4 ]---
[ 36.507773] Kernel panic - not syncing: Fatal exception in interrupt
[ 36.508476] Kernel Offset: 0x16000000 from 0xc1000000 (relocation range: 0xc0000000-0xdfbfdfff)
[ 36.509286] ---[ end Kernel panic - not syncing: Fatal exception in interrupt