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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Aug 06, 2025 at 10:19:36AM +0200, Thomas Gleixner wrote: > Oliver! > > On Wed, Aug 06 2025 at 16:01, Oliver Sang wrote: > > On Thu, Jul 31, 2025 at 04:03:01PM +0200, Thomas Gleixner wrote: > >> On Thu, Jul 31 2025 at 14:34, Thomas Gleixner wrote: > >> > Either you make the timeout longer or try the following on the kernel > >> > command line instead of 'ftrace_dump_on_cpu': > >> > >> instead of 'ftrace_dump_ooops' > > > > sorry for late, I just took several-day off. > > I hope you had a good time! > > > attached dmesg FYI. > > Thanks for doing this. Now the buffer is too short and as nothing stops > the tracer the interesting stuff goes out of sight. > > Can you please apply the patch below and try again? got it! just want to confirm, still use below params or need some modification? trace_event=preemptirq:preempt_disable,preemptirq:preempt_enable ftrace_dump_on_oops=orig_cpu trace_buf_size=100K panic_on_warn=1 > > Thanks, > > tglx > --- > --- a/kernel/sched/core.c > +++ b/kernel/sched/core.c > @@ -5850,6 +5850,8 @@ void preempt_count_sub(int val) > /* > * Underflow? > */ > + if (val > preempt_count()) > + tracing_off(); > if (DEBUG_LOCKS_WARN_ON(val > preempt_count())) > return; > /*