Messages in this thread Patch in this message | | | Date | Tue, 6 Feb 2024 21:39:02 +0000 | From | Nir Lichtman <> | Subject | [PATCH] kernel: add boot param to disable stack dump on panic |
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From: Nir Lichtman <nir@lichtman.org> Date: Sat, 3 Feb 2024 10:19:30 +0200 Subject: [PATCH] kernel: add boot param to disable stack dump on panic
--- Documentation/admin-guide/kernel-parameters.txt | 5 +++++ kernel/panic.c | 12 +++++++++++- 2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 31b3a2568..433e3e5d1 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1127,6 +1127,11 @@ MTRR settings. This parameter disables that behavior, possibly causing your machine to run very slowly. + disable_stack_dump_on_panic + This parameter disables call stack dumping when there + is a panic, which can help obscure less earlier messages + that lead to the panic. + disable_timer_pin_1 [X86] Disable PIN 1 of APIC timer Can be useful to work around chipset bugs. diff --git a/kernel/panic.c b/kernel/panic.c index 2807639aa..a1e1d064e 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -266,6 +266,16 @@ static void panic_other_cpus_shutdown(bool crash_kexec) crash_smp_send_stop(); } +static int disable_stack_dump_on_panic __initdata; + +static int __init disable_stack_dump_on_panic_setup(char *str) +{ + disable_stack_dump_on_panic = 1; + return 0; +} + +early_param("disable_stack_dump_on_panic", disable_stack_dump_on_panic_setup); + /** * panic - halt the system * @fmt: The text string to print @@ -340,7 +350,7 @@ void panic(const char *fmt, ...) /* * Avoid nested stack-dumping if a panic occurs during oops processing */ - if (!test_taint(TAINT_DIE) && oops_in_progress <= 1) + if (!test_taint(TAINT_DIE) && oops_in_progress <= 1 && !disable_stack_dump_on_panic) dump_stack(); #endif -- 2.39.2
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