Re: [DRBD-user] [PATCH] xen-blkback: Switch to closed state after releasing the backing device

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On Thu, Sep 13, 2018 at 05:08:00PM +0200, Roger Pau Monné wrote:
> So I have the following patch which I think might solve your issues
> while keeping the reset logic working. Would you mind giving it a try
> with your use case and pvgrub?

Thanks for the patch.  It seems to be having some problems with pvgrub:
machines don't boot past pvgrub and they are using 100% CPU.  Also in
dom0 xenstored is usind 100% CPU - strace reports it is looping in this:

read(26, "\\\240\0\0", 4)               = 4
read(26, "\0\0\0\0L\0\0\0)\0\0\0\35\0\0\0+\\\232`\231\31\1&", 24) = 24
read(26, "/local/domain/0/backend/vbd/1/51712/state", 41) = 41
read(26, "\2\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\1\0\0\0004", 29) = 29
read(26, "\0\330\0\0", 4)               = 4
read(26, "\0\0\0\0L\0\0\0)\0\0\0\35\0\0\0+\\JG\231\31\1&", 24) = 24
read(26, "/local/domain/0/backend/vbd/2/51712/state", 41) = 41
read(26, "\2\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\2\0\0\0\1\0\0\0004", 29) = 29
read(26, "\0\200\1\0", 4)               = 4
read(26, "\0\0\0\0L\0\0\0)\0\0\0\35\0\0\0+\\Z\373\231\31\1&", 24) = 24
read(26, "/local/domain/0/backend/vbd/5/51712/state", 41) = 41
read(26, "\2\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\5\0\0\0\1\0\0\0004", 29) = 29
read(12, "\321\1\0\0", 4)               = 4
write(12, "\321\1\0\0", 4)              = 4

-- 
Valentin



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