On Thu, Apr 21, 2016 at 11:18:16AM +0200, Martin MOKREJŠ wrote:
> Hi Greg,
>
> thank you for your answer.
>
> Greg KH wrote:
> > 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@vostro) (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.
>
> They are still present:
>
> # dmesg | grep "UBSAN: Undefined behaviour"
> [ 3.113405] UBSAN: Undefined behaviour in
> drivers/usb/host/ehci-hub.c:877:47
> [ 5.678949] UBSAN: Undefined behaviour in fs/ext4/mballoc.c:2619:15
> [ 18.345599] UBSAN: Undefined behaviour in fs/ext4/mballoc.c:1281:11
> [ 34.544363] UBSAN: Undefined behaviour in
> ./arch/x86/include/asm/atomic.h:156:9
Ah, sorry about that, turns out this is a bug in the tool, not in the
code, see the thread from a few weeks ago in the linux-usb archives with
the subject:
Subject: function ehci_hub_control in ehci-hub.c
for all of the details.
thanks,
greg k-h
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