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Date: Sat, 13 Apr 2024 16:17:46 +0200
From: Oleg Nesterov <oleg@redhat.com>
To: Frederic Weisbecker <frederic@kernel.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	Leonardo Bras <leobras@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>
Cc: Tejun Heo <tj@kernel.org>, Lai Jiangshan <jiangshanlai@gmail.com>,
	linux-kernel@vger.kernel.org, Junyao Zhao <junzhao@redhat.com>,
	Chris von Recklinghausen <crecklin@redhat.com>
Subject: [PATCH] sched/isolation: fix boot crash when maxcpus <
 first-housekeeping-cpu
Message-ID: <20240413141746.GA10008@redhat.com>
References: <20240130010046.2730139-2-leobras@redhat.com>
 <20240402105847.GA24832@redhat.com>
 <20240411143905.GA19288@redhat.com>
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In-Reply-To: <20240411143905.GA19288@redhat.com>
User-Agent: Mutt/1.5.24 (2015-08-30)

housekeeping_setup() checks cpumask_intersects(present, online) to ensure
that the kernel will have at least one housekeeping CPU after smp_init(),
but this doesn't work if the maxcpus= kernel parameter limits the number
of processors available after bootup.

For example, the kernel with "maxcpus=2 nohz_full=0-2" parameters crashes
at boot time on my virtual machine with 4 CPUs.

Change housekeeping_setup() to use cpumask_first_and() and check that the
returned cpu number is valid and less than setup_max_cpus.

Another corner case is "nohz_full=0" on a machine with a single CPU or
with the maxcpus=1 kernel argument. In this case non_housekeeping_mask
is empty and IIUC tick_nohz_full_setup() makes no sense. And indeed, the
kernel hits the WARN_ON(tick_nohz_full_running) in tick_sched_do_timer().

And how should the kernel interpret the "nohz_full=" parameter? I think
it should be silently ignored, but currently cpulist_parse() happily
returns the empty cpumask and this leads to the same problem.

Change housekeeping_setup() to check cpumask_empty(non_housekeeping_mask)
and do nothing in this case.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 kernel/sched/isolation.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index 2a262d3ecb3d..5891e715f00d 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c
@@ -118,6 +118,7 @@ static void __init housekeeping_setup_type(enum hk_type type,
 static int __init housekeeping_setup(char *str, unsigned long flags)
 {
 	cpumask_var_t non_housekeeping_mask, housekeeping_staging;
+	unsigned int first_cpu;
 	int err = 0;
 
 	if ((flags & HK_FLAG_TICK) && !(housekeeping.flags & HK_FLAG_TICK)) {
@@ -138,7 +139,8 @@ static int __init housekeeping_setup(char *str, unsigned long flags)
 	cpumask_andnot(housekeeping_staging,
 		       cpu_possible_mask, non_housekeeping_mask);
 
-	if (!cpumask_intersects(cpu_present_mask, housekeeping_staging)) {
+	first_cpu = cpumask_first_and(cpu_present_mask, housekeeping_staging);
+	if (first_cpu >= nr_cpu_ids || first_cpu >= setup_max_cpus) {
 		__cpumask_set_cpu(smp_processor_id(), housekeeping_staging);
 		__cpumask_clear_cpu(smp_processor_id(), non_housekeeping_mask);
 		if (!housekeeping.flags) {
@@ -147,6 +149,9 @@ static int __init housekeeping_setup(char *str, unsigned long flags)
 		}
 	}
 
+	if (cpumask_empty(non_housekeeping_mask))
+		goto free_housekeeping_staging;
+
 	if (!housekeeping.flags) {
 		/* First setup call ("nohz_full=" or "isolcpus=") */
 		enum hk_type type;
-- 
2.25.1.362.g51ebf55