*** This bug is a duplicate of bug 1572291 ***
https://bugs.launchpad.net/bugs/1572291
------- Comment From [email protected] 2016-09-06 10:21 EDT-------
I think I found the bug in the genwqe code:
ddcb_cmd_fixups() -> genwqe_alloc_sync_sgl() (fails in f/lpage, but
sgl->sgl != NULL and f/lpage maybe also != NULL) -> ddcb_cmd_cleanup()
-> genwqe_free_sync_sgl() (double free, because sgl->sgl != NULL and
f/lpage maybe also != NULL)
In this scenario we would have exactly the kind of double free that
would explain the WARNING / Bad page state, and as expected it is caused
by broken error handling (cleanup).
Not being familiar with the genwqe code, it would be good if Frank could
have a look at the patch.
Using the Ubuntu git source, tag Ubuntu-4.4.0-33.52, I can reproduce the
"Bad page state" issue, and with the patch on top I cannot reproduce it
any more.
Alex, I'll attach a debian kernel package with the patch applied, please
verify if it also solves the issue for you.
Frank, I'll attach the patch, please comment.
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https://bugs.launchpad.net/bugs/1559194
Title:
Bad page state in process genwqe_gunzip pfn:3c275 in the genwqe device
driver
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