Commit-ID: 7e8e6816c6495a1168f9a7a50125d82c23e59300 Gitweb: https://git.kernel.org/tip/7e8e6816c6495a1168f9a7a50125d82c23e59300 Author: Thomas Gleixner <t...@linutronix.de> AuthorDate: Tue, 2 Jul 2019 17:53:35 +0200 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Wed, 3 Jul 2019 09:04:06 +0200
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 <t...@linutronix.de> Acked-by: Mark Rutland <mark.rutl...@arm.com> Cc: Josh Poimboeuf <jpoim...@redhat.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Steven Rostedt <rost...@goodmis.org> Link: https://lkml.kernel.org/r/alpine.deb.2.21.1907021750100.1...@nanos.tec.linutronix.de --- kernel/stacktrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c index 36139de0a3c4..c8d0f05721a1 100644 --- a/kernel/stacktrace.c +++ b/kernel/stacktrace.c @@ -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));
