** Also affects: linux-azure (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux-azure-edge (Ubuntu Xenial)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1747543
Title:
[Hyper-V] linux-azure: PCI: hv: Do not sleep in compose_msi_msg()
Status in linux-azure package in Ubuntu:
Confirmed
Status in linux-azure-edge package in Ubuntu:
New
Status in linux-azure source package in Xenial:
New
Status in linux-azure-edge source package in Xenial:
New
Bug description:
Part of the transparent SR-IOV series appears to be missing from 4.13.
PCI: hv: Do not sleep in compose_msi_msg()
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=80bfeeb9dd6b54ac108c884c792f0fc7d4912bee
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.
Please add this to linux-azure on 4.13.
To manage notifications about this bug go to:
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