Re: Kernel panic during SysRq-b on Alpha

[Ivan Kokshaysky]

On Wed, Sep 21, 2005 at 03:11:07PM +0200, Brice Goglin wrote:
> Kernel bug at kernel/printk.c:683
> swapper(0): Kernel Bug 1
> pc = [<fffffc000032706c>]  ra = [<fffffc00004352d4>]  ps = 0007    Not
> tainted
> pc is at acquire_console_sem+0x2c/0x90

Indeed, acquire_console_sem() does BUG() in interrupt context now,
as in the case of SysRq-b.

Ivan.

--- linux/arch/alpha/kernel/process.c.orig	Mon Aug 29 03:41:01 2005
+++ linux/arch/alpha/kernel/process.c	Thu Sep 22 09:51:26 2005
@@ -127,6 +127,10 @@ common_shutdown_1(void *generic_ptr)
 	/* If booted from SRM, reset some of the original environment. */
 	if (alpha_using_srm) {
 #ifdef CONFIG_DUMMY_CONSOLE
+		/* If we've gotten here after SysRq-b, leave interrupt
+		   context before taking over the console. */
+		if (in_interrupt())
+			irq_exit();
 		/* This has the effect of resetting the VGA video origin.  */
 		take_over_console(&dummy_con, 0, MAX_NR_CONSOLES-1, 1);
 #endif
-
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