Re: [Xen-devel] [linux-3.18 bisection] complete test-amd64-amd64-pair

[Ian Jackson <ian.jackson@xxxxxxxxxx>]

Jan, are you investigating this regression ?

osstest service owner writes ("[linux-3.18 bisection] complete 
test-amd64-amd64-pair"):
> branch xen-unstable
> xenbranch xen-unstable
> job test-amd64-amd64-pair
> testid xen-boot/dst_host
> 
> Tree: linux 
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git
> Tree: qemu git://xenbits.xen.org/qemu-xen-traditional.git
> Tree: qemuu git://xenbits.xen.org/qemu-xen.git
> Tree: xen git://xenbits.xen.org/xen.git
> 
> *** Found and reproduced problem changeset ***
> 
>   Bug is in tree:  linux 
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
>   Bug introduced:  7b8052e19304865477e03a0047062d977309a22f
>   Bug not present: d255d18a34a8d53ccc4a019dc07e17b6e8cf6bd1
>   Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/131278/
> 
> 
>   commit 7b8052e19304865477e03a0047062d977309a22f
>   Author: Jan Beulich <JBeulich@xxxxxxxx>
>   Date:   Mon Oct 19 04:23:29 2015 -0600
>   
>       igb: fix NULL derefs due to skipped SR-IOV enabling
>       
>       [ Upstream commit be06998f96ecb93938ad2cce46c4289bf7cf45bc ]
>       
>       The combined effect of commits 6423fc3416 ("igb: do not re-init SR-IOV
>       during probe") and ceee3450b3 ("igb: make sure SR-IOV init uses the
>       right number of queues") causes VFs no longer getting set up, leading
>       to NULL pointer dereferences due to the adapter's ->vf_data being NULL
>       while ->vfs_allocated_count is non-zero. The first commit not only
>       neglected the side effect of igb_sriov_reinit() that the second commit
>       tried to account for, but also that of setting IGB_FLAG_HAS_MSIX,
>       without which igb_enable_sriov() is effectively a no-op. Calling
>       igb_{,re}set_interrupt_capability() as done here seems to address this,
>       but I'm not sure whether this is better than sinply reverting the other
>       two commits.
>       
>       Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>       Tested-by: Aaron Brown <aaron.f.brown@xxxxxxxxx>
>       Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
>       Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
> 
> 
> For bisection revision-tuple graph see:
>    
> http://logs.test-lab.xenproject.org/osstest/results/bisect/linux-3.18/test-amd64-amd64-pair.xen-boot--dst_host.html
> Revision IDs in each graph node refer, respectively, to the Trees above.


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