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rcu: Add BOOTPARAM_RCU_STALL_PANIC Kconfig option

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Add a Kconfig option to set the default value of the
kernel.panic_on_rcu_stall sysctl, allowing the kernel to be built
with panic-on-RCU-stall enabled by default.

This is useful for high-availability systems that require automatic
recovery (via panic_timeout) when a CPU stall is detected, without
needing userspace to configure the sysctl at boot.

This follows the pattern established by BOOTPARAM_SOFTLOCKUP_PANIC
and BOOTPARAM_HUNG_TASK_PANIC.  The runtime sysctl can still override
the Kconfig default.

Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Gustavo Luiz Duarte <gustavold@gmail.com>
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
This commit is contained in:
Gustavo Luiz Duarte 2026-03-17 17:41:17 -04:00 committed by Joel Fernandes
parent a18396219b
commit ab875b3e17
2 changed files with 25 additions and 1 deletions
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24
kernel/rcu/Kconfig.debug
View File

@ -175,6 +175,30 @@ config RCU_CPU_STALL_NOTIFIER
Say Y here if you want RCU CPU stall notifiers (you don't want them)
Say N if you are unsure.
config BOOTPARAM_RCU_STALL_PANIC
bool "Panic (reboot) on RCU CPU stall"
depends on RCU_STALL_COMMON
default n
help
Say Y here to enable the kernel to panic when an RCU CPU stall
is detected.
The panic can be used in combination with panic_timeout,
to cause the system to reboot automatically after an
RCU CPU stall has been detected. This feature is useful for
high-availability systems that have uptime guarantees and
where a CPU stall must be resolved ASAP.
The kernel.max_rcu_stall_to_panic sysctl can be used to set
a minimum number of stalls before panicking, allowing the
system to tolerate a given number of RCU CPU stalls before
triggering a panic.
This setting can be overridden at runtime via the
kernel.panic_on_rcu_stall sysctl parameter.
Say N if unsure.
config RCU_TRACE
bool "Enable tracing for RCU"
depends on DEBUG_KERNEL

2
kernel/rcu/tree_stall.h
View File

@ -17,7 +17,7 @@
// Controlling CPU stall warnings, including delay calculation.
/* panic() on RCU Stall sysctl. */
static int sysctl_panic_on_rcu_stall __read_mostly;
static int sysctl_panic_on_rcu_stall __read_mostly = IS_ENABLED(CONFIG_BOOTPARAM_RCU_STALL_PANIC);
static int sysctl_max_rcu_stall_to_panic __read_mostly;
static const struct ctl_table rcu_stall_sysctl_table[] = {