I'd like to nominate commit f605cfca8c39 ("perf/x86/intel: Fix large period handling on Broadwell CPUs") for backport to the affected stable Linux releases. (The bug was introduced in 4.1.)
Because of this bug, the NMI watchdog timer may fire spuriously on Broadwell systems, resulting in a hard lockup panic when there is, in fact, no lockup.
On Thu, Jun 21, 2018 at 01:50:56PM -0700, Jim Mattson wrote:
I'd like to nominate commit f605cfca8c39 ("perf/x86/intel: Fix large period handling on Broadwell CPUs") for backport to the affected stable Linux releases. (The bug was introduced in 4.1.)
Because of this bug, the NMI watchdog timer may fire spuriously on Broadwell systems, resulting in a hard lockup panic when there is, in fact, no lockup.
I just checked, and it looks like this is already included in the following kernel releases: 4.9.104 4.14.45 4.16.13 4.17 and it does not apply to the 4.4.y tree at all.
If it needs to go into 4.4, can you please send a working backport?
thanks,
greg k-h
linux-stable-mirror@lists.linaro.org
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Greg KH -
Jim Mattson