Commit 7e8e6816 authored Jul 02, 2019 by Thomas Gleixner

stacktrace: Use PF_KTHREAD to check for kernel threads



!current->mm is not a reliable indicator for kernel threads as they might
temporarily use a user mm. Check for PF_KTHREAD instead.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1907021750100.1802@nanos.tec.linutronix.de

parent 6fbc7275

kernel/stacktrace.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -228,7 +228,7 @@ unsigned int stack_trace_save_user(unsigned long *store, unsigned int size)
		};

		/* Trace user stack if not a kernel thread */
		if (!current->mm)
		if (current->flags & PF_KTHREAD)
		return 0;

		arch_stack_walk_user(consume_entry, &c, task_pt_regs(current));

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