From: Joe Perches <joe@perches.com> To: kernel test robot <oliver.sang@intel.com> Cc: Christoph Lameter <cl@linux.com>, Pekka Enberg <penberg@kernel.org>, David Rientjes <rientjes@google.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, 0day robot <lkp@intel.com>, lkp@lists.01.org, ltp@lists.linux.it Subject: Re: [mm] b6efe2fcc4: BUG:kernel_NULL_pointer_dereference,address Date: Fri, 13 Nov 2020 08:13:36 -0800 [thread overview] Message-ID: <97b1b575659bc87a07a308765769451d9eee4aef.camel@perches.com> (raw) In-Reply-To: <20201113121025.GA7578@xsang-OptiPlex-9020> On Fri, 2020-11-13 at 20:10 +0800, kernel test robot wrote: > Greeting, > > FYI, we noticed the following commit (built with gcc-9): > > commit: b6efe2fcc4e11010710ef5cd8e2bcbeb221a06c6 ("mm: slub: Convert sysfs sprintf family to sysfs_emit/sysfs_emit_at") > url: https://github.com/0day-ci/linux/commits/Joe-Perches/mm-Convert-sysfs-sprintf-family-to-sysfs_emit/20201102-041456 [] > on test machine: 8 threads Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz with 32G memory > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): > > If you fix the issue, kindly add following tag > Reported-by: kernel test robot <oliver.sang@intel.com> > > [ 41.689368] BUG: kernel NULL pointer dereference, address: 0000000000000010 > [ 41.696354] #PF: supervisor read access in kernel mode > [ 41.701508] #PF: error_code(0x0000) - not-present page > [ 41.706661] PGD 0 P4D 0 > [ 41.709205] Oops: 0000 [#1] SMP PTI > [ 41.712702] CPU: 3 PID: 4619 Comm: read_all Tainted: G I 5.10.0-rc1-00005-gb6efe2fcc4e1 #1 > [ 41.722296] Hardware name: Dell Inc. OptiPlex 7050/062KRH, BIOS 1.2.0 12/22/2016 > [ 41.729714] RIP: 0010:slabs_cpu_partial_show+0x95/0xe0 Right, thanks. I mistakenly dropped a test for page below: @@ -5156,44 +5156,45 @@ static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf) page = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); - if (page && len < PAGE_SIZE - 20) - len += sprintf(buf + len, " C%d=%d(%d)", cpu, - page->pobjects, page->pages); + len += sysfs_emit_at(buf, len, " C%d=%d(%d)", + cpu, page->pobjects, page->pages); } I'll correct it and resubmit.
WARNING: multiple messages have this Message-ID (diff)
From: Joe Perches <joe@perches.com> To: ltp@lists.linux.it Subject: [LTP] [mm] b6efe2fcc4: BUG:kernel_NULL_pointer_dereference, address Date: Fri, 13 Nov 2020 08:13:36 -0800 [thread overview] Message-ID: <97b1b575659bc87a07a308765769451d9eee4aef.camel@perches.com> (raw) In-Reply-To: <20201113121025.GA7578@xsang-OptiPlex-9020> On Fri, 2020-11-13 at 20:10 +0800, kernel test robot wrote: > Greeting, > > FYI, we noticed the following commit (built with gcc-9): > > commit: b6efe2fcc4e11010710ef5cd8e2bcbeb221a06c6 ("mm: slub: Convert sysfs sprintf family to sysfs_emit/sysfs_emit_at") > url: https://github.com/0day-ci/linux/commits/Joe-Perches/mm-Convert-sysfs-sprintf-family-to-sysfs_emit/20201102-041456 [] > on test machine: 8 threads Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz with 32G memory > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): > > If you fix the issue, kindly add following tag > Reported-by: kernel test robot <oliver.sang@intel.com> > > [ 41.689368] BUG: kernel NULL pointer dereference, address: 0000000000000010 > [ 41.696354] #PF: supervisor read access in kernel mode > [ 41.701508] #PF: error_code(0x0000) - not-present page > [ 41.706661] PGD 0 P4D 0 > [ 41.709205] Oops: 0000 [#1] SMP PTI > [ 41.712702] CPU: 3 PID: 4619 Comm: read_all Tainted: G I 5.10.0-rc1-00005-gb6efe2fcc4e1 #1 > [ 41.722296] Hardware name: Dell Inc. OptiPlex 7050/062KRH, BIOS 1.2.0 12/22/2016 > [ 41.729714] RIP: 0010:slabs_cpu_partial_show+0x95/0xe0 Right, thanks. I mistakenly dropped a test for page below: @@ -5156,44 +5156,45 @@ static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf) page = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); - if (page && len < PAGE_SIZE - 20) - len += sprintf(buf + len, " C%d=%d(%d)", cpu, - page->pobjects, page->pages); + len += sysfs_emit_at(buf, len, " C%d=%d(%d)", + cpu, page->pobjects, page->pages); } I'll correct it and resubmit.
next prev parent reply other threads:[~2020-11-13 16:13 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-01 20:12 [PATCH 0/5] mm: Convert sysfs sprintf family to sysfs_emit Joe Perches 2020-11-01 20:12 ` [PATCH 1/5] mm: Use sysfs_emit for struct kobject * uses Joe Perches 2020-11-01 20:12 ` [PATCH 2/5] mm: huge_memory: Convert remaining use of sprintf to sysfs_emit and neatening Joe Perches 2020-11-01 20:12 ` [PATCH 3/5] mm:backing-dev: Use sysfs_emit in macro defining functions Joe Perches 2020-11-01 20:12 ` [PATCH 4/5] mm: shmem: Convert shmem_enabled_show to use sysfs_emit_at Joe Perches 2020-11-01 20:48 ` Matthew Wilcox 2020-11-01 21:04 ` Joe Perches 2020-11-01 21:04 ` Joe Perches 2020-11-01 21:19 ` Matthew Wilcox 2020-11-01 21:43 ` Joe Perches 2020-11-01 21:43 ` Joe Perches 2020-11-01 22:06 ` Matthew Wilcox 2020-11-01 22:08 ` Joe Perches 2020-11-01 22:08 ` Joe Perches 2020-11-01 22:13 ` Joe Perches 2020-11-01 22:13 ` Joe Perches 2020-11-01 22:14 ` Joe Perches 2020-11-01 22:14 ` Joe Perches 2020-11-02 13:33 ` Greg Kroah-Hartman 2020-11-02 14:08 ` Matthew Wilcox 2020-11-02 14:32 ` Greg Kroah-Hartman 2020-11-02 14:40 ` Matthew Wilcox 2020-11-02 17:01 ` Joe Perches 2020-11-02 17:01 ` Joe Perches 2020-11-01 20:12 ` [PATCH 5/5] mm: slub: Convert sysfs sprintf family to sysfs_emit/sysfs_emit_at Joe Perches 2020-11-13 12:10 ` [mm] b6efe2fcc4: BUG:kernel_NULL_pointer_dereference,address kernel test robot 2020-11-13 12:10 ` [LTP] [mm] b6efe2fcc4: BUG:kernel_NULL_pointer_dereference, address kernel test robot 2020-11-13 16:13 ` Joe Perches [this message] 2020-11-13 16:13 ` Joe Perches 2020-11-13 16:13 ` [mm] b6efe2fcc4: BUG:kernel_NULL_pointer_dereference,address Joe Perches
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