Dne 25. 11. 18 v 0:30 Cesare Leonardi napsal(a):
Since my message did not reach the list, I'm resending, but first I've
subscribed myself.
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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?
Hi
Traces are completely misleading.
It does look like 'freeze' happens during LV resize of device
(just wild guess from bug=913138)
To track down the issue - there would need to be probably some communication
with bug reporters - they would need to expose what they were doing plus state
of dm tables and number of other things.
It's nearly impossible to guess just out of this 'trace' of sleeping process.
From traces it seems - raid kernel driver is sleeping - so it could i.e. mean
some 'dm' target is left in suspended state - possibly due to ?bug? of lvm2
command that has crashed and left table in the incorrect state??
Anyway without way more info such bug report is meaningless.
Regards
Zdenek
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