On Tue, May 16, 2006 at 11:39:42PM -0300, Alberto Bertogli wrote:
> [42949374.050000] Kernel panic - not syncing: Kernel mode fault at addr 0x0,
> ip 0x4000f349
Err, there was a rather serious bug in that last patch. Can you
replace it with the version below and boot UML again?
Jeff
Index: linux-2.6.16/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.16.orig/arch/um/os-Linux/skas/process.c
+++ linux-2.6.16/arch/um/os-Linux/skas/process.c
@@ -45,6 +45,22 @@ int is_skas_winch(int pid, int fd, void
return(1);
}
+static int ptrace_dump_regs(int pid)
+{
+ unsigned long regs[HOST_FRAME_SIZE];
+ int i;
+
+ if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
+ return -errno;
+ else {
+ printk("Stub registers -\n");
+ for(i = 0; i < HOST_FRAME_SIZE; i++)
+ printk("\t%d - %lx\n", i, regs[i]);
+ }
+
+ return 0;
+}
+
void wait_stub_done(int pid, int sig, char * fname)
{
int n, status, err;
@@ -68,18 +84,10 @@ void wait_stub_done(int pid, int sig, ch
if((n < 0) || !WIFSTOPPED(status) ||
(WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){
- unsigned long regs[HOST_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 < HOST_FRAME_SIZE; i++)
- printk("\t%d - %lx\n", i, regs[i]);
- }
+ err = ptrace_dump_regs(pid);
+ if(err)
+ printk("Failed to get registers from stub, "
+ "errno = %d\n", -err);
panic("%s : failed to wait for SIGUSR1/SIGTRAP, "
"pid = %d, n = %d, errno = %d, status = 0x%x\n",
fname, pid, n, errno, status);
@@ -146,9 +154,14 @@ static void handle_trap(int pid, union u
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
if((err < 0) || !WIFSTOPPED(status) ||
- (WSTOPSIG(status) != SIGTRAP + 0x80))
+ (WSTOPSIG(status) != SIGTRAP + 0x80)){
+ err = ptrace_dump_regs(pid);
+ if(err)
+ printk("Failed to get registers from process, "
+ "errno = %d\n", -err);
panic("handle_trap - failed to wait at end of syscall, "
"errno = %d, status = %d\n", errno, status);
+ }
}
handle_syscall(regs);
Index: linux-2.6.16/arch/um/sys-x86_64/user-offsets.c
===================================================================
--- linux-2.6.16.orig/arch/um/sys-x86_64/user-offsets.c
+++ linux-2.6.16/arch/um/sys-x86_64/user-offsets.c
@@ -57,7 +57,7 @@ void foo(void)
OFFSET(HOST_SC_SS, sigcontext, ss);
#endif
- DEFINE_LONGS(HOST_FRAME_SIZE, FRAME_SIZE);
+ DEFINE_LONGS(HOST_FRAME_SIZE, sizeof(struct user_regs_struct));
DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long));
DEFINE(HOST_XFP_SIZE, 0);
DEFINE_LONGS(HOST_RBX, RBX);
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