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    Subject[PATCH 17/43] x86/irq/64: In the stack overflow warning, print the offending IP
    Date
    From: Andy Lutomirski <luto@kernel.org>

    In case something goes wrong with unwind (not unlikely in case of
    overflow), print the offending IP where we detected the overflow.

    Signed-off-by: Andy Lutomirski <luto@kernel.org>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Cc: Borislav Petkov <bpetkov@suse.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: https://lkml.kernel.org/r/6fcf700cc5ee884fb739b67d1246ab4185c41409.1511497875.git.luto@kernel.org
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    arch/x86/kernel/irq_64.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
    index 020efbf5786b..d86e344f5b3d 100644
    --- a/arch/x86/kernel/irq_64.c
    +++ b/arch/x86/kernel/irq_64.c
    @@ -57,10 +57,10 @@ static inline void stack_overflow_check(struct pt_regs *regs)
    if (regs->sp >= estack_top && regs->sp <= estack_bottom)
    return;

    - WARN_ONCE(1, "do_IRQ(): %s has overflown the kernel stack (cur:%Lx,sp:%lx,irq stk top-bottom:%Lx-%Lx,exception stk top-bottom:%Lx-%Lx)\n",
    + WARN_ONCE(1, "do_IRQ(): %s has overflown the kernel stack (cur:%Lx,sp:%lx,irq stk top-bottom:%Lx-%Lx,exception stk top-bottom:%Lx-%Lx,ip:%pF)\n",
    current->comm, curbase, regs->sp,
    irq_stack_top, irq_stack_bottom,
    - estack_top, estack_bottom);
    + estack_top, estack_bottom, (void *)regs->ip);

    if (sysctl_panic_on_stackoverflow)
    panic("low stack detected by irq handler - check messages\n");
    --
    2.14.1
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