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parisc: Disable further stack checks when panic occurs during stack check

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

Reported-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2017-07-08 23:25:14 +02:00
parent a56e88ec05
commit 5bc64bd246
1 changed files with 7 additions and 1 deletions
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8
arch/parisc/kernel/irq.c
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@ -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
}