Messages in this thread | | | Date | Wed, 7 Dec 2016 16:39:25 +0000 | From | Mark Rutland <> | Subject | Re: Perf hotplug lockup in v4.9-rc8 |
| |
On Wed, Dec 07, 2016 at 02:30:58PM +0000, Mark Rutland wrote: > On Wed, Dec 07, 2016 at 01:52:17PM +0000, Mark Rutland wrote: > > Hi all > > > > Jeremy noticed a kernel lockup on arm64 when the perf tool was used in > > parallel with hotplug, which I've reproduced on arm64 and x86(-64) with > > v4.9-rc8. In both cases I'm using defconfig; I've tried enabling lockdep > > but it was silent for arm64 and x86. > > > > I haven't yet tested earlier kernels and I'm not sure how long this has > > been around for; I'm currently building a v4.8 defconfig to compare > > with. In the meantime, info dump below. > > On v4.8 it hangs on x86, but my SSH session survived. Log below; I'll > give v4.7 a go...
It seems the lockup has been around at least since v4.6, so I'll give up trying to find a point when it didn't exist.
Peter had some ideas over IRC, so I'll give those a go atop of v4.9-rc8.
Thanks, Mark.
| |