[src/trunk]: src/sys/uvm/pmap add pmaphist calls around seg_tab[] manipulatio...

[mrg <mrg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a9b0e63571db
branches:  trunk
changeset: 937391:a9b0e63571db
user:      mrg <mrg%NetBSD.org@localhost>
date:      Mon Aug 17 08:56:27 2020 +0000

description:
add pmaphist calls around seg_tab[] manipulation.  hopefully will
help find what causes this:

panic: pmap_segtab_alloc: pm_segtab.seg_tab[1010] != 0 (0x980000004eeb6068): from free list

diffstat:

 sys/uvm/pmap/pmap_segtab.c |  17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)

diffs (65 lines):

diff -r a07bc04a6db3 -r a9b0e63571db sys/uvm/pmap/pmap_segtab.c
--- a/sys/uvm/pmap/pmap_segtab.c        Mon Aug 17 08:34:36 2020 +0000
+++ b/sys/uvm/pmap/pmap_segtab.c        Mon Aug 17 08:56:27 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap_segtab.c,v 1.15 2020/08/07 07:19:45 skrll Exp $   */
+/*     $NetBSD: pmap_segtab.c,v 1.16 2020/08/17 08:56:27 mrg Exp $     */
 
 /*-
  * Copyright (c) 1998, 2001 The NetBSD Foundation, Inc.
@@ -67,7 +67,7 @@
 
 #include <sys/cdefs.h>
 
-__KERNEL_RCSID(0, "$NetBSD: pmap_segtab.c,v 1.15 2020/08/07 07:19:45 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap_segtab.c,v 1.16 2020/08/17 08:56:27 mrg Exp $");
 
 /*
  *     Manages physical address maps.
@@ -210,12 +210,18 @@
 {
        pmap_segtab_t *stp = *stp_p;
 
+       UVMHIST_FUNC(__func__);
+       UVMHIST_CALLARGS(pmaphist, "pm=%#jx stpp=%#jx free=%jd",
+           (uintptr_t)pmap, (uintptr_t)stp_p, free_stp, 0);
+       UVMHIST_LOG(pmaphist, " callback=%jx flags=%jx va=%jx vinc=%jx",
+           (uintptr_t)callback, flags, (uintptr_t)va, (uintptr_t)vinc);
        for (size_t i = (va / vinc) & (PMAP_SEGTABSIZE - 1);
             i < PMAP_SEGTABSIZE;
             i++, va += vinc) {
 #ifdef _LP64
                if (vinc > NBSEG) {
                        if (stp->seg_seg[i] != NULL) {
+                               UVMHIST_LOG(pmaphist, " recursing", 0, 0, 0, 0);
                                pmap_segtab_release(pmap, &stp->seg_seg[i],
                                    true, callback, flags, va, vinc / NSEGPG);
                                KASSERT(stp->seg_seg[i] == NULL);
@@ -255,6 +261,7 @@
 #endif
 
                stp->seg_tab[i] = NULL;
+               UVMHIST_LOG(pmaphist, " zeroing tab[%jd]", i, 0, 0, 0);
        }
 
        if (free_stp) {
@@ -448,6 +455,10 @@
        pmap_segtab_t *stp = pmap->pm_segtab;
        pt_entry_t *pte;
 
+       UVMHIST_FUNC(__func__);
+       UVMHIST_CALLARGS(pmaphist, "pm=%#jx va=%#jx flags=%jx",
+           (uintptr_t)pmap, (uintptr_t)va, flags, 0);
+
        pte = pmap_pte_lookup(pmap, va);
        if (__predict_false(pte == NULL)) {
 #ifdef _LP64
@@ -513,6 +524,8 @@
                *pte_p = pte;
 #endif
                KASSERT(pte == stp->seg_tab[(va >> SEGSHIFT) & (PMAP_SEGTABSIZE - 1)]);
+               UVMHIST_LOG(pmaphist, " set tab[%jd]=%jx",
+                   (va >> SEGSHIFT) & (PMAP_SEGTABSIZE - 1), pte, 0, 0);
 
 #ifdef DEBUG
                for (size_t i = 0; i < NPTEPG; i++) {