soft lockups during VM poweron and poweroff

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soft lockups during VM poweron and poweroff #13

Open cuinutanix opened 7 years ago

cuinutanix commented 7 years ago

Seeing this multiple times per day while doing manual power on and off.

Message from syslogd@NTNX-S240876X6C18782-A at May  3 13:19:46 ...
 kernel:NMI watchdog: BUG: soft lockup - CPU#80 stuck for 23s! [libvirtd:7559]

Host is 2 sockets x 8 cores, 512GB memory. The VM being powered on is configured with 4 cores x 8 threads, with 8GB of memory, backed by hugetlbfs.

Host is running hostos-2.0 release from 2017-03-31. Some googling turned up this patch: https://lkml.org/lkml/2017/2/28/378.

paulusmack commented 7 years ago

I did about 800 cycles of destroy/start on a VM backed with hugepages (4 cores x 8 threads, 8GB of memory) on a P8 machine here without seeing any lockups or any misbehaviour at all. Clearly there is something more needed to trigger this bug.