Hello, On Sun, Feb 14, 2016 at 09:07:04AM +0800, kernel test robot wrote: > FYI, we noticed the below changes on > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > commit 82607adcf9cdf40fb7b5331269780c8f70ec6e35 ("workqueue: implement lockup > detector") > > > [ 75.684302] virtio-pci 0000:00:06.0: virtio_pci: leaving for legacy driver > [ 88.791869] ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 11 > [ 88.795120] virtio-pci 0000:00:07.0: virtio_pci: leaving for legacy driver > [ 90.789792] BUG: workqueue lockup - pool cpus=0 flags=0x4 nice=0 stuck for > 42s! > [ 90.794158] Showing busy workqueues and worker pools: > [ 90.796507] workqueue cgroup_pidlist_destroy: flags=0x0 > [ 90.798976] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1
Was the VM not executing for a long time? I can't think why cgroup_pidlist_destroy would hang for over 40s. Thanks. -- tejun
