[PATCH] arm64: Fix garbled logs caused by race between multiple stack traces

[Will Deacon]

On Thu, May 07, 2026 at 12:38:46PM +0000, David Sauerwein wrote:
> On Wed, May 06, 2026 at 11:58:44AM +0100, Catalin Marinas wrote:
> > While the above does solve the line splitting, the trace is still not
> > that readable as we get line interleaving.
> >
> > I wonder whether we could do something like dump_stack_lvl() at the
> > show_regs() level to synchronise the printing. If that works, we
> > wouldn't need the above change (which isn't incorrect but maybe we can
> > do better).
> 
> I think the change is still needed in either case. Other threads can log
> something unrelated to the stack traces which can still cause the
> register lines to be broken. After all, use of pr_cont is discouraged.
> checkpatch.pl warns saying "Avoid logging continuation uses where
> feasible" when adding new callers of pr_cont.
> 
> I agree though that forcing stack traces to be printed sequentially
> would help with readability. Maybe this can be added as a separate
> change.

Presumably it would replace this patch?

Will