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Commit 6edf428e authored by Jeff Dike's avatar Jeff Dike Committed by Linus Torvalds
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[PATCH] uml: Improve SIGBUS diagnostics 



UML can get a SIGBUS anywhere if the tmpfs mount being used for its memory
runs out of space.  This patch adds a printk before the panic to provide a
clue as to what likely went wrong.

Signed-off-by: default avatarJeff Dike <jdike@addtoit.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 6b7aaad9

arch/um/kernel/trap.c

+9 −2
Original line number Diff line number Diff line
@@ -227,9 +227,16 @@ void bad_segv(struct faultinfo fi, unsigned long ip) 


void relay_signal(int sig, union uml_pt_regs *regs)

{

	if(arch_handle_signal(sig, regs)) return;

	if(!UPT_IS_USER(regs))

	if(arch_handle_signal(sig, regs))

		return;



	if(!UPT_IS_USER(regs)){

		if(sig == SIGBUS)

			printk("Bus error - the /dev/shm or /tmp mount likely "

			       "just ran out of space\n");

		panic("Kernel mode signal %d", sig);

	}



        current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);

	force_sig(sig, current);

}