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
#

Updated dmesg is attached.
Martin