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[73.78.62.130]) by smtp.googlemail.com with ESMTPSA id x3-20020a056602160300b006bba42f7822sm6408213iow.52.2022.12.05.16.35.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Dec 2022 16:35:14 -0800 (PST) From: Jim Cromie To: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: jani.nikula@intel.com, ville.syrjala@linux.intel.com, daniel.vetter@ffwll.ch, seanpaul@chromium.org, robdclark@gmail.com, jbaron@akamai.com, gregkh@linuxfoundation.org, Jim Cromie Subject: [RFC PATCH 15/17] dyndbg: ddebug_sanity() Date: Mon, 5 Dec 2022 17:34:22 -0700 Message-Id: <20221206003424.592078-16-jim.cromie@gmail.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221206003424.592078-1-jim.cromie@gmail.com> References: <20221206003424.592078-1-jim.cromie@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1751423102104255603?= X-GMAIL-MSGID: =?utf-8?q?1751423102104255603?= It appears that, at least for builtin drm,i915 loadable amdgpu, data in the class_refs section is not properly linked, this works partway towards isolating the problem. The "NO CLI" name test is failing. This version of the report fails with a non-canonical address: // v2pr_info("NO CLI name on: %s\n", cli->map->mod_name); [ 0.109299] dyndbg: add-module: main 6 sites 1.3 [ 0.109595] general protection fault, probably for non-canonical address 0x7265766972640000: 0000 fwiw: $ perl -e ' $a = pack "H8", "7265766972640000"; print "a:<$a>\n"' a: These records are added to __dyndbg_class_refs section by DYNDBG_CLASSMAP_USE This patch adds ddebug_sanity(), and calls it 3 times to characterize what goes wrong and when. It turns out that its contents are wrong immediately, in 1st step of dynamic_debug_init(). [ 0.107327] dyndbg: classes [ 0.107537] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 0.107592] dyndbg: class-refs [ 0.107823] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e35e nm:0000000000000000 nm:(null) [ 0.108554] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe86 nm:ffffffff834fc4c8 nm: [ 0.108590] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785aa nm:ffffffff834fc4c8 nm: Those maps are wrong: class-refs should all ref the same map, ie class[0]: module:drm. the nm:s should also show module names of 3 builtin clients of drm. So things must end poorly. modprobing the loadable module does better: bash-5.2# modprobe amdgpu [ 6645.212706] AMD-Vi: AMD IOMMUv2 functionality not available on this system - This is not a bug. [ 6645.653124] dyndbg: add-module: amdgpu 4425 sites 0.1 [ 6645.653582] dyndbg: classes [ 6645.653830] dyndbg: class-refs [ 6645.654124] dyndbg: class-ref[0]: cli:ffffffffc0a31b90 map:ffffffff834fc4c8 nm:ffffffffc08bc176 nm:amdgpu [ 6645.654936] dyndbg: classes [ 6645.655188] dyndbg: class-refs [ 6645.655450] dyndbg: class-ref[0]: cli:ffffffffc0a31b90 map:ffffffff834fc4c8 nm:ffffffffc08bc176 nm:amdgpu [ 6645.656246] dyndbg: class_ref[0] amdgpu -> drm [ 6645.656613] dyndbg: amdgpu needs drm, 0x0 [ 6645.656953] dyndbg: apply bitmap: 0x0 to: 0x0 [ 6645.657322] dyndbg: break on 0/1 [ 6645.657592] dyndbg: 4425 debug prints in module amdgpu Here, the maps are correct; they ref the class[0] module:drm above. That said, apply bitmap is wrong. Signed-off-by: Jim Cromie --- [ 1.210094] dyndbg: add-module: drm 302 sites 1.3 [ 1.210496] dyndbg: classes [ 1.210674] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.211290] dyndbg: class-refs [ 1.211548] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.211674] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.212464] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.212675] dyndbg: classes start: class[0]: module:drm base:0 len:10 ty:0 [ 1.213257] dyndbg: builtin class: module:drm base:0 len:10 ty:0 [ 1.213675] dyndbg: controlling kp: drm.drm.debug [ 1.214087] dyndbg: module:drm attached 1 classes [ 1.214490] dyndbg: classes [ 1.214674] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.215291] dyndbg: class-refs [ 1.215552] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.215674] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.216430] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.216674] dyndbg: NO CLI ffffffff8293e376 7265766972640000 [ 1.217149] dyndbg: 302 debug prints in module drm [ 1.217549] dyndbg: add-module: drm_kms_helper 95 sites 1.3 [ 1.217674] dyndbg: classes [ 1.217913] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.218525] dyndbg: class-refs [ 1.218674] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.219486] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.219674] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.220469] dyndbg: classes [ 1.220674] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.221324] dyndbg: class-refs [ 1.221606] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.221674] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.222472] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.222674] dyndbg: NO CLI ffffffff8293e376 7265766972640000 [ 1.223173] dyndbg: 95 debug prints in module drm_kms_helper [ 1.223675] dyndbg: add-module: drm_display_helper 150 sites 1.3 [ 1.224223] dyndbg: classes [ 1.224484] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.224676] dyndbg: class-refs [ 1.224954] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.225674] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.226498] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.226674] dyndbg: classes [ 1.226931] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.227577] dyndbg: class-refs [ 1.227674] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.228501] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.228674] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.229443] dyndbg: NO CLI ffffffff8293e376 7265766972640000 [ 1.229674] dyndbg: 150 debug prints in module drm_display_helper [ 1.230195] dyndbg: add-module: ttm 2 sites 1.3 [ 1.230581] dyndbg: classes [ 1.230674] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.231291] dyndbg: class-refs [ 1.231559] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.231674] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.232439] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.232674] dyndbg: classes [ 1.232915] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.233535] dyndbg: class-refs [ 1.233674] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.234470] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.234674] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.235427] dyndbg: NO CLI ffffffff8293e376 7265766972640000 [ 1.235674] dyndbg: 2 debug prints in module ttm [ 1.236079] dyndbg: add-module: i915 1657 sites 1.3 [ 1.236490] dyndbg: classes [ 1.236674] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.237283] dyndbg: class-refs [ 1.237545] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.237674] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.238431] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.238674] dyndbg: classes [ 1.238911] dyndbg: class[0]: module:drm base:0 len:10 ty:0 cm:ffffffff834fc4c8 [ 1.239519] dyndbg: class-refs [ 1.239674] dyndbg: class-ref[0]: cli:ffffffff834fc508 map:ffffffff8293e376 nm:0000000000000000 nm:(null) [ 1.240467] dyndbg: class-ref[1]: cli:ffffffff834fc518 map:ffffffff8293fe9e nm:ffffffff834fc4c8 nm: [ 1.240674] dyndbg: class-ref[2]: cli:ffffffff834fc528 map:ffffffff829785c2 nm:ffffffff834fc4c8 nm: [ 1.241478] dyndbg: NO CLI ffffffff8293e376 7265766972640000 [ 1.241674] dyndbg: 1657 debug prints in module i915 --- include/linux/dynamic_debug.h | 4 ++-- lib/dynamic_debug.c | 32 +++++++++++++++++++++++++++++++- 2 files changed, 33 insertions(+), 3 deletions(-) diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h index 6f53a687cb32..2a1199aadab6 100644 --- a/include/linux/dynamic_debug.h +++ b/include/linux/dynamic_debug.h @@ -115,8 +115,8 @@ struct ddebug_class_map { EXPORT_SYMBOL(_var) struct ddebug_class_user { - char *user_mod_name; - struct ddebug_class_map *map; + const char *user_mod_name; + const struct ddebug_class_map *map; }; /** * DYNDBG_CLASSMAP_USE - refer to a classmap, DEFINEd elsewhere. diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index 02f36c553835..46684aa7284d 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -1301,7 +1301,8 @@ static void ddebug_attach_client_module_classes(struct ddebug_table *dt, struct continue; } if (!cli->user_mod_name) { - v2pr_info("NO CLI name\n"); + v2pr_info("NO CLI name %px %px\n", cli->map, cli->map->mod_name); + // v2pr_info("NO CLI name on: %s\n", cli->map->mod_name); continue; } @@ -1325,6 +1326,29 @@ static void ddebug_attach_client_module_classes(struct ddebug_table *dt, struct } } +static void ddebug_sanity(struct _ddebug_info *di) +{ + struct ddebug_class_map *cm; + struct ddebug_class_user *cli; + int i; + + if (di->num_classes) + v2pr_info("classes\n"); + + for (i = 0, cm = di->classes; i < di->num_classes; i++, cm++) { + v2pr_info("class[%d]: module:%s base:%d len:%d ty:%d cm:%px\n", + i, cm->mod_name, cm->base, cm->length, cm->map_type, cm); + } + if (di->num_class_refs) + v2pr_info("class-refs\n"); + + for (i = 0, cli = di->class_refs; i < di->num_class_refs; i++, cli++) { + // cli->map->mod_name will segv + v2pr_info("class-ref[%d]: cli:%px map:%px nm:%px nm:%s\n", i, cli, + cli->map, cli->user_mod_name, cli->user_mod_name); + } +} + /* * Allocate a new ddebug_table for the given module * and add it to the global list. @@ -1357,6 +1381,8 @@ int ddebug_add_module(struct _ddebug_info *di, const char *modname) INIT_LIST_HEAD(&dt->link); + ddebug_sanity(di); + if (di->num_classes) ddebug_attach_module_classes(dt, di); @@ -1364,6 +1390,8 @@ int ddebug_add_module(struct _ddebug_info *di, const char *modname) list_add_tail(&dt->link, &ddebug_tables); mutex_unlock(&ddebug_lock); + ddebug_sanity(di); + if (di->num_class_refs) ddebug_attach_client_module_classes(dt, di); @@ -1493,6 +1521,8 @@ static int __init dynamic_debug_init(void) .num_class_refs = __stop___dyndbg_class_refs - __start___dyndbg_class_refs, }; + ddebug_sanity(&di); + if (&__start___dyndbg == &__stop___dyndbg) { if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) { pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n");