Re: [uml-devel] 2.6.14-rc4; panic: do_syscall_stub : failed to wait for SIGUSR1/SIGTRAP

[Jeff D. <jd...@ad...>]

On Wed, Oct 12, 2005 at 11:39:02PM -0400, William Stearns wrote:
> Kernel panic - not syncing: do_syscall_stub : failed to wait for 
> SIGUSR1/SIGTRAP, pid = 3357, n = 3357, errno = 0, status = 0xb7f

Can you apply the patch below, and see what it says?

				Jeff

Index: linux-2.6.14-rc2-mm1/arch/um/kernel/skas/process.c
===================================================================
--- linux-2.6.14-rc2-mm1.orig/arch/um/kernel/skas/process.c	2005-10-05 18:37:51.000000000 -0400
+++ linux-2.6.14-rc2-mm1/arch/um/kernel/skas/process.c	2005-10-05 18:50:23.000000000 -0400
@@ -69,6 +69,17 @@
 
         if((n < 0) || !WIFSTOPPED(status) ||
            (WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){
+		unsigned long regs[FRAME_SIZE];
+		if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
+			printk("Failed to get registers from stub, "
+			       "errno = %d\n", errno);
+		else {
+			int i;
+
+			printk("Stub registers -\n");
+			for(i = 0; i < FRAME_SIZE; i++)
+				printk("\t%d - %lx\n", i, regs[i]);
+		}
                 panic("%s : failed to wait for SIGUSR1/SIGTRAP, "
                       "pid = %d, n = %d, errno = %d, status = 0x%x\n",
                       fname, pid, n, errno, status);