[Bug 89621] EXT4-fs error (device dm-1): ext4_mb_release_inode_pa:3773: group 24089, free 34, pa_free 32

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=89621

--- Comment #5 from Theodore Tso <tytso@mit.edu> ---
Yes, barriers are enabled by default, and with cache=none, the flush commands
*should* be sent down to the host device.   It might be worth doing a quick
blktrace to make sure the host device is getting the cache flushes and they
aren't getting dropped by qemu or by mdraid, but the configuration at least
looks sane.

In the cases where you've seen the problem, have there been any sense where
either (a) the host has suffered a crash or shutdown or power drop, or (b) the
guest VM has been abruptly shutdown or killed without triggering a normal guest
OS shutdown?

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