linux-kernel - Re: Kernel 4.1.6 Panic due to slab corruption

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Message-ID: <pan.2015.09.07.11.58.18@googlemail.com>
Date:	Mon, 7 Sep 2015 11:58:18 +0000 (UTC)
From:	Holger Hoffstätte 
	<holger.hoffstaette@...glemail.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Kernel 4.1.6 Panic due to slab corruption

On Mon, 07 Sep 2015 11:49:12 +0000, Holger Hoffstätte wrote:

> On Mon, 07 Sep 2015 14:30:49 +0300, Nikolay Borisov wrote:
> 
>> If you have the vmlinux image for the kernel you were running at the
>> time, the crash occured, could you post the output of addr2line -f -e
>> path/to/vmlinux ffffffff8115bd4d to see if it also fails in
>> get_freepointer.
> 
> Had to rebuild to get an uncompressed vmlinux, but here it is:
> 
> holger>addr2line -f -e vmlinux ffffffff8115bd4d
> kmem_cache_alloc
> ??:?
> 
> Not sure how much we can learn from this. :}

Also for what it's worth the related splatter is all in the same place:

holger>zgrep ffffffff8115bd4d /var/log/kern.log.0.gz 
Sep  5 20:42:02 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:02 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:03 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:03 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:03 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:10 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:10 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:10 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:10 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:10 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
Sep  5 20:42:10 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160

CPU is a 4 core HT i7 (aka 8 vcores), and so I have 8 splats.

thanks,

Holger

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