The patch titled
Subject: panic: dump registers on panic_on_warn
has been added to the -mm tree. Its filename is
panic-dump-registers-on-panic_on_warn.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/panic-dump-registers-on-panic_on_warn.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/panic-dump-registers-on-panic_on_warn.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Alexey Kardashevskiy <aik@xxxxxxxxx>
Subject: panic: dump registers on panic_on_warn
Currently we print stack and registers for ordinary warnings but we do not
for panic_on_warn which looks as oversight - panic() will reboot the
machine but won't print registers.
This moves printing of registers and modules earlier.
This does not move the stack dumping as panic() dumps it.
Link: https://lkml.kernel.org/r/20200804095054.68724-1-aik@xxxxxxxxx
Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Rafael Aquini <aquini@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/panic.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/kernel/panic.c~panic-dump-registers-on-panic_on_warn
+++ a/kernel/panic.c
@@ -589,6 +589,11 @@ void __warn(const char *file, int line,
if (args)
vprintk(args->fmt, args->args);
+ print_modules();
+
+ if (regs)
+ show_regs(regs);
+
if (panic_on_warn) {
/*
* This thread may hit another WARN() in the panic path.
@@ -600,12 +605,7 @@ void __warn(const char *file, int line,
panic("panic_on_warn set ...\n");
}
- print_modules();
-
- if (regs)
- show_regs(regs);
- else
- dump_stack();
+ dump_stack();
print_irqtrace_events(current);
_
Patches currently in -mm which might be from aik@xxxxxxxxx are
panic-dump-registers-on-panic_on_warn.patch
