linux-ext4 - Re: 4.5.1: UBSAN: Undefined behaviour in ./arch/x86/include/asm/atomic.h:156:9

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Message-ID: <20160421004229.GB10917@kroah.com>
Date:	Thu, 21 Apr 2016 09:42:29 +0900
From:	Greg KH <greg@...ah.com>
To:	Martin MOKREJŠ <mmokrejs@...il.com>
Cc:	USB list <linux-usb@...r.kernel.org>, linux-ext4@...r.kernel.org
Subject: Re: 4.5.1: UBSAN: Undefined behaviour in
 ./arch/x86/include/asm/atomic.h:156:9

On Thu, Apr 21, 2016 at 12:22:49AM +0200, Martin MOKREJŠ wrote:
> Hi,
>   I am not certain to to forward this to, so I am trying linux-usb and ext4. Please add relevant people/lists, thank you.
> 
> # dmesg | grep "UBSAN: Undefined behaviour"
> [    2.638843] UBSAN: Undefined behaviour in drivers/usb/host/ehci-hub.c:873:47
> [    8.553620] UBSAN: Undefined behaviour in fs/ext4/mballoc.c:2612:15
> [   25.341048] UBSAN: Undefined behaviour in fs/ext4/mballoc.c:1274:11
> [   41.460542] UBSAN: Undefined behaviour in ./arch/x86/include/asm/atomic.h:156:9
> #
> 
> Full dmesg is attached.
> 
> Hope this helps,
> Martin

> [    0.000000] Linux version 4.5.1-default-pciehp (root@...tro) (gcc version 5.3.0 (Gentoo 5.3.0 p1.0, pie-0.6.5) ) #1 SMP Thu Apr 14 14:17:48 CEST 2016

Please try 4.6-rc4, a number of UBSAN issues have been fixed there.

thansk,

greg k-h
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