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x86, mce: use force_sig_info to kill process in machine check 

Impact: bug fix (with tolerant == 3)

do_exit cannot be called directly from the exception handler because
it can sleep and the exception handler runs on the exception stack.
Use force_sig() instead.

Based on a earlier patch by Ying Huang who debugged the problem.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Andi Kleen 2009-02-12 13:39:33 +01:00 committed by H. Peter Anvin
parent 6ec68bff3c
commit 380851bc6b
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/cpu/mcheck/mce_64.c
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@ -295,11 +295,11 @@ void do_machine_check(struct pt_regs * regs, long error_code)
* If we know that the error was in user space, send a
* SIGBUS. Otherwise, panic if tolerance is low.
*
* do_exit() takes an awful lot of locks and has a slight
* force_sig() takes an awful lot of locks and has a slight
* risk of deadlocking.
*/
if (user_space) {
do_exit(SIGBUS);
force_sig(SIGBUS, current);
} else if (panic_on_oops || tolerant < 2) {
mce_panic("Uncorrected machine check",
&panicm, mcestart);