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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-12-17 03:52:01 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2023-01-20 02:55:12 +0300 |
| commit | 344da544f177f919cf6919e5abcd388f27aa53db (patch) | |
| tree | 47fbf9344fd33a71023a235f45e219be672e421a /lib | |
| parent | 1a3ea611fc105759cf1023e922d00cf44569b8bb (diff) | |
| download | linux-344da544f177f919cf6919e5abcd388f27aa53db.tar.xz | |
x86/nmi: Print reasons why backtrace NMIs are ignored
Instrument nmi_trigger_cpumask_backtrace() to dump out diagnostics based
on evidence accumulated by exc_nmi(). These diagnostics are dumped for
CPUs that ignored an NMI backtrace request for more than 10 seconds.
[ paulmck: Apply Ingo Molnar feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <x86@kernel.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/nmi_backtrace.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/nmi_backtrace.c b/lib/nmi_backtrace.c index d01aec6ae15c..5274bbb026d7 100644 --- a/lib/nmi_backtrace.c +++ b/lib/nmi_backtrace.c @@ -64,6 +64,7 @@ void nmi_trigger_cpumask_backtrace(const cpumask_t *mask, if (!cpumask_empty(to_cpumask(backtrace_mask))) { pr_info("Sending NMI from CPU %d to CPUs %*pbl:\n", this_cpu, nr_cpumask_bits, to_cpumask(backtrace_mask)); + nmi_backtrace_stall_snap(to_cpumask(backtrace_mask)); raise(to_cpumask(backtrace_mask)); } @@ -74,6 +75,7 @@ void nmi_trigger_cpumask_backtrace(const cpumask_t *mask, mdelay(1); touch_softlockup_watchdog(); } + nmi_backtrace_stall_check(to_cpumask(backtrace_mask)); /* * Force flush any remote buffers that might be stuck in IRQ context |