From: Andi Kleen Date: Thu, 12 Feb 2009 12:39:33 +0000 (+0100) Subject: x86, mce: use force_sig_info to kill process in machine check X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=380851bc6b1b4107c61dfa2997f9095dcf779336;p=linux-beck.git 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 Acked-by: Thomas Gleixner Signed-off-by: H. Peter Anvin --- diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c b/arch/x86/kernel/cpu/mcheck/mce_64.c index 1f184efb6bc2..25cf624eccb7 100644 --- a/arch/x86/kernel/cpu/mcheck/mce_64.c +++ b/arch/x86/kernel/cpu/mcheck/mce_64.c @@ -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);