2 files changed, 14 insertions, 1 deletions

diff --git a/arch/ia64/kernel/unaligned.c b/arch/ia64/kernel/unaligned.c
index ff0e7c10faa7..6db08599ebbc 100644
--- a/arch/ia64/kernel/unaligned.c
+++ b/arch/ia64/kernel/unaligned.c
@@ -59,6 +59,7 @@ dump (const char *str, void *vp, size_t len)
  *  (i.e. don't allow attacker to fill up logs with unaligned accesses).
  */
 int no_unaligned_warning;
+int unaligned_dump_stack;
 static int noprint_warning;
 
 /*
@@ -1371,9 +1372,12 @@ ia64_handle_unaligned (unsigned long ifa, struct pt_regs *regs)
                         }
                 }
         } else {
-                if (within_logging_rate_limit())
+                if (within_logging_rate_limit()) {
                         printk(KERN_WARNING "kernel unaligned access to 0x%016lx, ip=0x%016lx\n",
                                ifa, regs->cr_iip + ipsr->ri);
+                        if (unaligned_dump_stack)
+                                dump_stack();
+                }
                 set_fs(KERNEL_DS);
         }
 
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 3e38b74b6124..368d1638ee78 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -144,6 +144,7 @@ extern int acct_parm[];
 
 #ifdef CONFIG_IA64
 extern int no_unaligned_warning;
+extern int unaligned_dump_stack;
 #endif
 
 #ifdef CONFIG_RT_MUTEXES
@@ -781,6 +782,14 @@ static struct ctl_table kern_table[] = {
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec,
         },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "unaligned-dump-stack",
+                .data           = &unaligned_dump_stack,
+                .maxlen         = sizeof (int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
 #endif
 #ifdef CONFIG_DETECT_SOFTLOCKUP
         {