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| author | Helge Deller <deller@gmx.de> | 2017-07-09 00:25:14 +0300 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2017-07-23 21:59:45 +0300 |
| commit | 5bc64bd246ca00e0bb0b7137afaf586f2f66a911 (patch) | |
| tree | e2546d9b04e9625ccab87e29ccad3a7b9e1beaff | |
| parent | a56e88ec05df50110f2bf578b6e17128f37111ed (diff) | |
| download | linux-5bc64bd246ca00e0bb0b7137afaf586f2f66a911.tar.xz | |
parisc: Disable further stack checks when panic occurs during stack check
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>
| -rw-r--r-- | arch/parisc/kernel/irq.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c index ba5e1c7b1f17..5404e4086cb9 100644 --- a/arch/parisc/kernel/irq.c +++ b/arch/parisc/kernel/irq.c @@ -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 } |