Can see the difference in the dmesg output
16.04:
Command line: BOOT_IMAGE=/boot/vmlinuz-4.4.0-1049-aws
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
nvme.io_timeout=4294967295
18.04:
Command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-1001-aws
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
nvme_core.io_timeout=255
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1758466
Title:
bionic: default io_timeout for nvme is 255 on AWS
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