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From: Meelis Roos <mroos@linux.ee>
To: Joerg Roedel <jroedel@suse.de>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
	linux-mm@kvack.org, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: 32-bit PTI with THP = userspace corruption
Date: Fri, 31 Aug 2018 10:10:52 +0300 (EEST)	[thread overview]
Message-ID: <alpine.LRH.2.21.1808311005080.31140@math.ut.ee> (raw)
In-Reply-To: <20180830205527.dmemjwxfbwvkdzk2@suse.de>

> > I am seeing userland corruption and application crashes on multiple 
> > 32-bit machines with 4.19-rc1+git. The machines vary: PII, PIII, P4. 
> > They are all Intel. AMD Duron/Athlon/AthlonMP have been fine in my tests 
> > so far (may be configuration dependent).
> 
> Thanks for the report! I'll try to reproduce the problem tomorrow and
> investigate it. Can you please check if any of the kernel configurations
> that show the bug has CONFIG_X86_PAE set? If not, can you please test
> if enabling this option still triggers the problem?

PAE was not visible itself, but when I changed HIGHMEM_4G to 
HIGHMEM_64G, X86_PAE was also selected and the resutling kernel works.

Also, I verified that the olid proliants with 6G RAM already have 
HIGHMEM_64G set and they do not exhibit the problem either.

-- 
Meelis Roos (mroos@linux.ee)

      parent reply	other threads:[~2018-08-31  7:10 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-30 18:09 32-bit PTI with THP = userspace corruption Meelis Roos
2018-08-30 20:55 ` Joerg Roedel
2018-08-31  4:12   ` Meelis Roos
2018-08-31  7:07     ` Joerg Roedel
2018-09-08 10:24       ` Thomas Gleixner
2018-09-11 11:49         ` Joerg Roedel
2018-09-11 11:58           ` Meelis Roos
2018-09-11 12:12             ` Joerg Roedel
2018-09-18 13:00               ` Alan Cox
2018-10-21 12:37                 ` Pavel Machek
2018-10-22  7:56                   ` Joerg Roedel
2018-10-22 18:48                     ` Alan Cox
2018-10-23  9:11                       ` Not-so-old machines without PAE was " Pavel Machek
2018-10-22 20:56                     ` Pavel Machek
2018-09-11 18:20           ` Linus Torvalds
2018-08-31  7:10   ` Meelis Roos [this message]

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