On Tue, Jun 13, 2023 at 11:58:05AM -0700, Bhatnagar, Rishabh wrote: > > On 6/13/23 11:49 AM, Bhatnagar, Rishabh wrote: > > Hi Sebastian/Greg > > > > We are seeing RCU stall warnings from recent stable tree updates: > > 5.4.243, 5.10.180, 5.15.113, 6.1.31 onwards. > > This is seen in the upstream stable trees without any downstream patches. > > > > The issue is seen few minutes after booting without any workload. > > We launch hundred's of virtual instances and this shows up in 1-2 > > instances, so its hard to reproduce. > > Attaching a few stack traces below. > > > > The issue can be seen on virtual and baremetal instances. > > Another interesting point is we only see this on x86 based instances. > > We also did test this on linux-mainline but were not able to reproduce > > the issue. > > So maybe there's a fixup or related commit that has gone in? > > > > We tried bisecting the stable trees and found that after reverting the > > below commit we couldn't reproduce this in any of the kernels > > consistently. > > > > tick/common: Align tick period with the HZ tick. [ Upstream commit > > e9523a0d81899361214d118ad60ef76f0e92f71d ] > > > > > > Not exactly sure how this commit is affecting all stable kernels. > > Can you take a look at this issue and share your insight? Does this issue also show up in 6.3.y and in 6.4-rc5? thanks, greg k-h
