This is a note to let you know that I've just added the patch titled
watchdog: move softlockup_panic back to early_param
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
watchdog-move-softlockup_panic-back-to-early_param.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8b793bcda61f6c3ed4f5b2ded7530ef6749580cb Mon Sep 17 00:00:00 2001
From: Krister Johansen <kjlx@xxxxxxxxxxxxxxxxxx>
Date: Fri, 27 Oct 2023 14:46:53 -0700
Subject: watchdog: move softlockup_panic back to early_param
From: Krister Johansen <kjlx@xxxxxxxxxxxxxxxxxx>
commit 8b793bcda61f6c3ed4f5b2ded7530ef6749580cb upstream.
Setting softlockup_panic from do_sysctl_args() causes it to take effect
later in boot. The lockup detector is enabled before SMP is brought
online, but do_sysctl_args runs afterwards. If a user wants to set
softlockup_panic on boot and have it trigger should a softlockup occur
during onlining of the non-boot processors, they could do this prior to
commit f117955a2255 ("kernel/watchdog.c: convert {soft/hard}lockup boot
parameters to sysctl aliases"). However, after this commit the value
of softlockup_panic is set too late to be of help for this type of
problem. Restore the prior behavior.
Signed-off-by: Krister Johansen <kjlx@xxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: f117955a2255 ("kernel/watchdog.c: convert {soft/hard}lockup boot parameters to sysctl aliases")
Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/proc/proc_sysctl.c | 1 -
kernel/watchdog.c | 7 +++++++
2 files changed, 7 insertions(+), 1 deletion(-)
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1765,7 +1765,6 @@ static const struct sysctl_alias sysctl_
{"hung_task_panic", "kernel.hung_task_panic" },
{"numa_zonelist_order", "vm.numa_zonelist_order" },
{"softlockup_all_cpu_backtrace", "kernel.softlockup_all_cpu_backtrace" },
- {"softlockup_panic", "kernel.softlockup_panic" },
{ }
};
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -183,6 +183,13 @@ static DEFINE_PER_CPU(unsigned long, hrt
static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);
static unsigned long soft_lockup_nmi_warn;
+static int __init softlockup_panic_setup(char *str)
+{
+ softlockup_panic = simple_strtoul(str, NULL, 0);
+ return 1;
+}
+__setup("softlockup_panic=", softlockup_panic_setup);
+
static int __init nowatchdog_setup(char *str)
{
watchdog_user_enabled = 0;
Patches currently in stable-queue which might be from kjlx@xxxxxxxxxxxxxxxxxx are
queue-5.15/watchdog-move-softlockup_panic-back-to-early_param.patch
