linux-kernel - [REGRESSION] disabling and re-enabling magic sysrq fails after kernel 6.11

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Message-ID: <Zx2iQp6csn42PJA7@xavtug>
Date: Sat, 26 Oct 2024 19:15:30 -0700
From: "Ned T. Crigler" <crigler@...il.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	regressions@...ts.linux.dev
Subject: [REGRESSION] disabling and re-enabling magic sysrq fails after
 kernel 6.11

Hi,

It looks like starting with kernel 6.11, disabling and re-enabling magic
sysrq fails with these errors in dmesg:

kernel: input: input_handler_check_methods: only one event processing method can be defined (sysrq)
kernel: sysrq: Failed to register input handler, error -22

after doing:

# echo 0 > /proc/sys/kernel/sysrq
# echo 438 > /proc/sys/kernel/sysrq
# echo 0 > /proc/sys/kernel/sysrq
# echo 438 > /proc/sys/kernel/sysrq
# echo 0 > /proc/sys/kernel/sysrq
# echo 438 > /proc/sys/kernel/sysrq

-- 
Ned T. Crigler