I have a utility built on libjvm_db.c that uses it to walk the entire code cache and while updating it for 1.8 I discovered a bug in libjvm_db.c itself though I suspect it won't trigger in normal usage through pstack. The scopes_pcs_end value is incorrectly computed so if you scanned all the PcDescs you'd walk into the dependencies section. The fix is pretty trivial.

diff -r 073676d6d428 src/os/solaris/dtrace/libjvm_db.c
--- a/src/os/solaris/dtrace/libjvm_db.c
+++ b/src/os/solaris/dtrace/libjvm_db.c
@@ -592,7 +592,7 @@
   /* scopes_pcs */
   err = ps_pread(J->P, nm + OFFSET_nmethod_scopes_pcs_offset, &N->scopes_pcs_beg, SZ32);
   CHECK_FAIL(err);
- err = ps_pread(J->P, nm + OFFSET_nmethod_handler_table_offset, &N->scopes_pcs_end, SZ32);
+ err = ps_pread(J->P, nm + OFFSET_nmethod_dependencies_offset, &N->scopes_pcs_end, SZ32);
   CHECK_FAIL(err);
 
   /* scopes_data */