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

[Ming Lei]

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
> â
> 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?