Re: I/O hangs after resuming from suspend-to-ram

Ming Lei
2017-08-28T13:32:42Z

On Mon, Aug 28, 2017 at 03:10:35PM +0200, Martin Steigerwald wrote:
> Ming Lei - 28.08.17, 20:58:
> > On Sun, Aug 27, 2017 at 09:43:52AM +0200, Oleksandr Natalenko wrote:
> > > Hi.
> > >
> > > Here is disk setup for QEMU VM:
> > >
> > > ===
> > > [root@archmq ~]# smartctl -i /dev/sda
> > > …
> > > Device Model: QEMU HARDDISK
> > > Serial Number: QM00001
> > > Firmware Version: 2.5+
> > > User Capacity: 4,294,967,296 bytes [4.29 GB]
> > > Sector Size: 512 bytes logical/physical
> > > Device is: Not in smartctl database [for details use: -P showall]
> > > ATA Version is: ATA/ATAPI-7, ATA/ATAPI-5 published, ANSI NCITS 340-2000
> > > Local Time is: Sun Aug 27 09:31:54 2017 CEST
> > > SMART support is: Available - device has SMART capability.
> > > SMART support is: Enabled
> > >
> > > [root@archmq ~]# lsblk
> > > NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
> > > sda 8:0 0 4G 0 disk
> > > `-sda1 8:1 0 4G 0 part
> > >
> > > `-md0 9:0 0 4G 0 raid10
> > >
> > > `-system 253:0 0 4G 0 crypt
> > >
> > > |-system-boot 253:1 0 512M 0 lvm /boot
> > > |-system-swap 253:2 0 512M 0 lvm [SWAP]
> > >
> > > `-system-root 253:3 0 3G 0 lvm /
> > >
> > > sdb 8:16 0 4G 0 disk
> > > `-sdb1 8:17 0 4G 0 part
> > >
> > > `-md0 9:0 0 4G 0 raid10
> > >
> > > `-system 253:0 0 4G 0 crypt
> > >
> > > |-system-boot 253:1 0 512M 0 lvm /boot
> > > |-system-swap 253:2 0 512M 0 lvm [SWAP]
> > >
> > > `-system-root 253:3 0 3G 0 lvm /
> > >
> > > sr0 11:0 1 1024M 0 rom
> > >
> > > [root@archmq ~]# mdadm --misc --detail /dev/md0
> > >
> > > /dev/md0:
> > > Version : 1.2
> > >
> > > Creation Time : Sat Jul 29 16:37:05 2017
> > >
> > > Raid Level : raid10
> > > Array Size : 4191232 (4.00 GiB 4.29 GB)
> > >
> > > Used Dev Size : 4191232 (4.00 GiB 4.29 GB)
> > >
> > > Raid Devices : 2
> > >
> > > Total Devices : 2
> > >
> > > Persistence : Superblock is persistent
> > >
> > > Update Time : Sun Aug 27 09:30:33 2017
> > >
> > > State : clean
> > >
> > > Active Devices : 2
> > >
> > > Working Devices : 2
> > >
> > > Failed Devices : 0
> > >
> > > Spare Devices : 0
> > >
> > > Layout : far=2
> > >
> > > Chunk Size : 512K
> > >
> > > Name : archiso:0
> > > UUID : 43f4be59:c8d2fa0a:a94acdff:1c7f2f4e
> > >
> > > Events : 485
> > >
> > > Number Major Minor RaidDevice State
> > >
> > > 0 8 1 0 active sync /dev/sda1
> > > 1 8 17 1 active sync /dev/sdb1
> > >
> > > ===
> > >
> > > In words: 2 virtual disks, RAID10 setup with far-2 layout, LUKS on it,
> > > then
> > > LVM, then ext4 for boot, swap and btrfs for /.
> > >
> > > I couldn't reproduce the issue with single disk without RAID.
> >
> > Could you verify if the following patch fixes your issue?
>
> Could this also apply to non MD RAID systems? I am using BTRFS RAID
> 1 with two SSDs. So far with CFQ it runs stable.

It is for fixing Oleksandr's issue wrt. blk-mq, and looks not for you.

--
Ming