On 4/29/20 9:53 AM, Waiman Long wrote:
In a couple of places in the slub memory allocator, the code uses
"s->offset" as a check to see if the free pointer is put right after the
object. That check is no longer true with commit 3202fa62fb43 ("slub:
relocate freelist pointer to middle of object").
As a result, echoing "1" into the validate sysfs file, e.g. of dentry,
may cause a bunch of "Freepointer corrupt" error reports like the
following to appear with the system in panic afterwards.
[ 38.579769] =============================================================================
[ 38.580845] BUG dentry(666:pmcd.service) (Tainted: G B): Freepointer corrupt
[ 38.581948] -----------------------------------------------------------------------------
To fix it, use the check "s->offset == s->inuse" in the new helper
Sorry, forgot to change the commit log to ">=". Anyway, this is a
serious bug that needs to be fixed before v5.7 is released.
Cheers,
Longman
