[linux-lvm] LVM RAID: task mdX_raid1:221 blocked for more than 120 seconds

[Jack Wang]

+cc linux-raid

The call trace looks kinds of deadlock in raid
Cesare Leonardi <celeonar at gmail.com> 于2018年11月25日周日 上午12:31写道：
>
> Since my message did not reach the list, I'm resending, but first I've
> subscribed myself.
>
> ------------------
> Hello, I'm writing here to have your opinion and possibly some advice
> about some Debian bugs related to LVM RAID that are still unresolved:
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=913119
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=913138
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=904822
>
> Bug #913119 was filed by me, so I can personally provide some more
> information and do tests.
>
> Premises related di Debian unstable:
> * Debian's kernel is currently 4.18.20.
> * From kernel 4.17~rc7 Debian enabled SCSI_MQ_DEFAULT and DM_MQ_DEFAULT.
> * Debian's LVM userland is 2.02.176
>
> The above reports shows blocked I/O with different type of LVM RAID and
> with #913119 I've succesfully workarounded passing the following kernel
> parameters:
> scsi_mod.use_blk_mq=0 dm_mod.use_blk_mq=0
>
> I've read that RHEL will default to enabling SCSI_MQ_DEFAULT and
> DM_MQ_DEFAULT and will use kernel 4.18. Maybe you have already
> encountered this bug and it's already resolved. Or there are patches
> pending.
>
> What do you think? Should I file a bug in Red Hat bug tracker?
>
> Cesare.
>
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