On Thu, 2019-05-02 at 18:36 -0400, Pavel Tatashin wrote: > > Yes, here is the qemu config: > > > > qemu-system-x86_64 > > -machine accel=kvm > > -machine pc-i440fx-2.6,accel=kvm,usb=off,vmport=off,dump-guest-core=off,nvdimm > > -cpu Haswell-noTSX > > -m 12G,slots=3,maxmem=44G > > -realtime mlock=off > > -smp 8,sockets=2,cores=4,threads=1 > > -numa node,nodeid=0,cpus=0-3,mem=6G > > -numa node,nodeid=1,cpus=4-7,mem=6G > > -numa node,nodeid=2 > > -numa node,nodeid=3 > > -drive file=/virt/fedora-test.qcow2,format=qcow2,if=none,id=drive-virtio-disk1 > > -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x9,drive=drive-virtio-disk1,id=virtio-disk1,bootindex=1 > > -object memory-backend-file,id=mem1,share,mem-path=/virt/nvdimm1,size=16G,align=128M > > -device nvdimm,memdev=mem1,id=nv1,label-size=2M,node=2 > > -object memory-backend-file,id=mem2,share,mem-path=/virt/nvdimm2,size=16G,align=128M > > -device nvdimm,memdev=mem2,id=nv2,label-size=2M,node=3 > > -serial stdio > > -display none > > > > For the command list - I'm using WIP patches to ndctl/daxctl to add the > > command I mentioned earlier. Using this command, I can reproduce the > > lockdep issue. I thought I should be able to reproduce the issue by > > onlining/offlining through sysfs directly too - something like: > > > > node="$(cat /sys/bus/dax/devices/dax0.0/target_node)" > > for mem in /sys/devices/system/node/node"$node"/memory*; do > > echo "offline" > $mem/state > > done > > > > But with that I can't reproduce the problem. > > > > I'll try to dig a bit deeper into what might be happening, the daxctl > > modifications simply amount to doing the same thing as above in C, so > > I'm not immediately sure what might be happening. > > > > If you're interested, I can post the ndctl patches - maybe as an RFC - > > to test with. > > I could apply the patches and test with them. Also, could you please > send your kernel config. > Hi Pavel, I've CC'd you on the patches mentioned above, and also pushed them to a 'kmem-pending' branch on github: https://github.com/pmem/ndctl/tree/kmem-pending After building ndctl from the above, you will want to run: # daxctl reconfigure-device --mode=system-ram dax0.0 (this will also have onlined the memory sections) # daxctl reconfigure-device --mode=devdax --attempt-offline dax0.0 (this triggers the lockdep warnings) I've attached the kernel config here too (gzipped). Thanks, -Vishal
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