On Mon, 31 Jul 2017 16:37:12 -0700
Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx> wrote:
> The setup of MSI with Hyper-V host was sleeping with locks held.
> This error is reported when doing SR-IOV hotplug with kernel built with lockdep.
>
> BUG: sleeping function called from invalid context at kernel/sched/completion.c:93
> in_atomic(): 1, irqs_disabled(): 1, pid: 1405, name: ip
> 3 locks held by ip/1405:
> #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff976b10bb>] rtnetlink_rcv+0x1b/0x40
> #1: (&desc->request_mutex){+.+...}, at: [<ffffffff970ddd33>] __setup_irq+0xb3/0x720
> #2: (&irq_desc_lock_class){-.-...}, at: [<ffffffff970ddd65>] __setup_irq+0xe5/0x720
> irq event stamp: 3476
> hardirqs last enabled at (3475): [<ffffffff971b3005>] get_page_from_freelist+0x225/0xc90
> hardirqs last disabled at (3476): [<ffffffff978024e7>] _raw_spin_lock_irqsave+0x27/0x90
> softirqs last enabled at (2446): [<ffffffffc05ef0b0>] ixgbevf_configure+0x380/0x7c0 [ixgbevf]
> softirqs last disabled at (2444): [<ffffffffc05ef08d>] ixgbevf_configure+0x35d/0x7c0 [ixgbevf]
>
> The workaround is to poll for host response instead of blocking on
> completion.
>
> Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
This patch is not directly network related. It needs to go through PCI.
I will resend the series.
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