Comment 6 for bug 1762450

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LGB [Gábor Lénárt] (lgb) wrote :

Ok, I will investigate as soon as I have time. By the way, I am wondering if using BFQ as I/O scheduler can be the problem, ie:

# cat /etc/udev/rules.d/60-schedulers.rules
## set noop scheduler for non-rotating disks
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="noop"
## set bfq scheduler for rotating disks
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq"

# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic root=UUID=d203063e-78c0-425a-bee2-0e3ecb4ea74c ro quiet splash scsi_mod.use_blk_mq=1 vt.handoff=1

I guess, I try to remove BFQ specific stuffs as well to see if this fixes the problem.