linux-kernel - RE: [PATCH V2] fork: Improve error message for corrupted page tables

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Date:   Tue, 6 Aug 2019 16:10:16 +0000
From:   "Prakhya, Sai Praneeth" <sai.praneeth.prakhya@...el.com>
To:     Vlastimil Babka <vbabka@...e.cz>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
CC:     "Hansen, Dave" <dave.hansen@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>
Subject: RE: [PATCH V2] fork: Improve error message for corrupted page tables

> > With patch:
> > -----------
> > [   69.815453] mm/pgtable-generic.c:29: bad p4d
> 0000000084653642(800000025ca37467)
> > [   69.815872] BUG: Bad rss-counter state mm:00000000014a6c03
> type:MM_FILEPAGES val:2
> > [   69.815962] BUG: Bad rss-counter state mm:00000000014a6c03
> type:MM_ANONPAGES val:5
> > [   69.816050] BUG: non-zero pgtables_bytes on freeing mm: 20480
> >
> > Also, change print function (from printk(KERN_ALERT, ..) to
> > pr_alert()) so that it matches the other print statement.
> >
> > Cc: Ingo Molnar <mingo@...nel.org>
> > Cc: Vlastimil Babka <vbabka@...e.cz>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: Anshuman Khandual <anshuman.khandual@....com>
> > Acked-by: Dave Hansen <dave.hansen@...el.com>
> > Suggested-by: Dave Hansen <dave.hansen@...el.com>
> > Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
> 
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> 
> I would also add something like this to reduce risk of breaking it in the
> future:

Sure! Sounds good to me. Will add it to V3.

Regards,
Sai