Messages in this thread | | | Date | Sun, 16 Apr 2023 11:33:35 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH v2] mm: khugepaged: Fix kernel BUG in hpage_collapse_scan_file |
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Circling back to this fix...
The BUG() is obviously real. We're unsure that Ivan's fix is the best one. We haven't identified a Fixes:, and as this report is against the 6.2 kernel, a cc:stable will be needed.
According to the sysbot bisection (https://syzkaller.appspot.com/bug?id=7d6bb3760e026ece7524500fe44fb024a0e959fc), this is present in linux-5.19, so it might predate Zach's 58ac9a8993a13ebc changes. But that bisection claim might be misleading.
And Zach is offline for a few months. So can people please take a look and see if we can get this wrapped up?
Matthew, the assertion failure is in the
VM_BUG_ON(index != xas.xa_index);
which was added in 77da9389b9d5f, so perhaps you could take a look?
Thanks.
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