linux-kernel - Re: 5.1 and 5.1.1: BUG: unable to handle kernel paging request at ffffea0002030000

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Message-ID: <20190520115608.GK18914@techsingularity.net>
Date:   Mon, 20 May 2019 12:56:08 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Justin Piszcz <jpiszcz@...idpixels.com>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: 5.1 and 5.1.1: BUG: unable to handle kernel paging request at
 ffffea0002030000

On Sun, May 12, 2019 at 04:27:45AM -0400, Justin Piszcz wrote:
> Hello,
> 
> I've turned off zram/zswap and I am still seeing the following during
> periods of heavy I/O, I am returning to 5.0.xx in the meantime.
> 
> Kernel: 5.1.1
> Arch: x86_64
> Dist: Debian x86_64
> 
> [29967.019411] BUG: unable to handle kernel paging request at ffffea0002030000
> [29967.019414] #PF error: [normal kernel read fault]
> [29967.019415] PGD 103ffee067 P4D 103ffee067 PUD 103ffed067 PMD 0
> [29967.019417] Oops: 0000 [#1] SMP PTI
> [29967.019419] CPU: 10 PID: 77 Comm: khugepaged Tainted: G
>    T 5.1.1 #4
> [29967.019420] Hardware name: Supermicro X9SRL-F/X9SRL-F, BIOS 3.2 01/16/2015
> [29967.019424] RIP: 0010:isolate_freepages_block+0xb9/0x310
> [29967.019425] Code: 24 28 48 c1 e0 06 40 f6 c5 1f 48 89 44 24 20 49
> 8d 45 79 48 89 44 24 18 44 89 f0 4d 89 ee 45 89 fd 41 89 c7 0f 84 ef
> 00 00 00 <48> 8b 03 41 83 c4 01 a9 00 00 01 00 75 0c 48 8b 43 08 a8 01
> 0f 84

If you have debugging symbols installed, can you translate the faulting
address with the following?

ADDR=`nm /path/to/vmlinux-or-debuginfo-file | grep "t isolate_freepages_block\$" | awk '{print $1}'`
addr2line -i -e vmlinux `printf "0x%lX" $((0x$ADDR+0xb9))`

I haven't seen this particular error before so I want to see if the
faulting address could have anything to do with the randomising of
struct fields. Similarly a full dmesg log would be nice so I can see
what your memory layout looks like.

Thanks Justin.

-- 
Mel Gorman
SUSE Labs