On Wed, Oct 28, 2020 at 04:08:59PM -0400, Qian Cai wrote: > On Wed, 2020-10-28 at 08:53 -0700, Paul E. McKenney wrote: > > On Wed, Oct 28, 2020 at 10:39:47AM -0400, Qian Cai wrote: > > > On Tue, 2020-10-27 at 20:01 -0700, Paul E. McKenney wrote: > > > > If I have the right email thread associated with the right fixes, these > > > > commits in -rcu should be what you are looking for: > > > > > > > > 73b658b6b7d5 ("rcu: Prevent lockdep-RCU splats on lock > > > > acquisition/release") > > > > 626b79aa935a ("x86/smpboot: Move rcu_cpu_starting() earlier") > > > > > > > > And maybe this one as well: > > > > > > > > 3a6f638cb95b ("rcu,ftrace: Fix ftrace recursion") > > > > > > > > Please let me know if these commits do not fix things. > > > While those patches silence the warnings for x86. Other arches are still > > > suffering. It is only after applying the patch from Boqun below fixed > > > everything. > > > > Fair point! > > > > > Is it a good idea for Boqun to write a formal patch or we should fix all > > > arches > > > individually like "x86/smpboot: Move rcu_cpu_starting() earlier"? > > > > By Boqun's patch, you mean the change to debug_lockdep_rcu_enabled() > > shown below? Peter Zijlstra showed that real failures can happen, so we > > Yes. > > > do not want to cover them up. So we are firmly in "fix all architectures" > > space here, sorry! > > > > I am happy to accumulate those patches, but cannot commit to creating > > or testing them. > > Okay, I posted 3 patches for each arch and CC'ed you. Very good! I have acked them. > BTW, it looks like > something is wrong on @vger.kernel.org today where I received many of those, > > 4.7.1 Hello [216.205.24.124], for recipient address <linux-kernel@xxxxxxxxxxxxxxx> the policy analysis reported: zpostgrey: connect: Connection refused > > and I can see your previous mails did not even reach there either. > > https://lore.kernel.org/lkml/ It does seem to be having some difficulty, and some people are looking into it. Hopefully soon someone who can actually make the needed changes. ;-) Thanx, Paul