parisc: Disable further stack checks when panic occurs during stack check (5bc64bd2) · Commits · 戴 / test

Before the irq handler detects a low stack and then panics the kernel, disable further stack checks to avoid recursive panics. Reported-by:

arch/parisc/kernel/irq.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -413,6 +413,10 @@ static inline void stack_overflow_check(struct pt_regs *regs)
		if (regs->sr[7])
		return;

		/* exit if already in panic */
		if (sysctl_panic_on_stackoverflow < 0)
		return;

		/* calculate kernel stack usage */
		stack_usage = sp - stack_start;
		#ifdef CONFIG_IRQSTACKS
		@@ -454,8 +458,10 @@ check_kernel_stack:
		#ifdef CONFIG_IRQSTACKS
		panic_check:
		#endif
		if (sysctl_panic_on_stackoverflow)
		if (sysctl_panic_on_stackoverflow) {
		sysctl_panic_on_stackoverflow = -1; /* disable further checks */
		panic("low stack detected by irq handler - check messages\n");
		}
		#endif
		}