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Tue, 27 Jul 2021 20:41:08 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B7F104C040; Tue, 27 Jul 2021 20:41:07 +0000 (GMT) Received: from linux.ibm.com (unknown [9.145.86.232]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Tue, 27 Jul 2021 20:41:07 +0000 (GMT) Date: Tue, 27 Jul 2021 23:41:05 +0300 From: Mike Rapoport To: Matt Turner Cc: Michael Cree , linux-mm@kvack.org, linux-alpha , LKML Subject: Re: Regression bisected to fa3354e4ea39 (mm: free_area_init: use maximal zone PFNs rather than zone sizes) Message-ID: References: <20210726192311.uffqnanxw3ac5wwi@ivybridge> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-GUID: S8r08Wo9u9aCfzX1EHvYSMLnmWVwisHg X-Proofpoint-ORIG-GUID: lNX4TlWTPq5LmsgcIPyx2wZqsYcT-S58 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-07-27_13:2021-07-27,2021-07-27 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 mlxlogscore=999 malwarescore=0 lowpriorityscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 mlxscore=0 phishscore=0 bulkscore=0 adultscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2107270119 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 27, 2021 at 12:24:26PM -0700, Matt Turner wrote: > On Mon, Jul 26, 2021 at 11:43 PM Mike Rapoport wrote: > > > > On Mon, Jul 26, 2021 at 02:23:20PM -0700, Matt Turner wrote: > > > On Mon, Jul 26, 2021 at 1:06 PM Mike Rapoport wrote: > > > > > > > > Hi Matt, > > > > > > > > On Mon, Jul 26, 2021 at 12:27:50PM -0700, Matt Turner wrote: > > > > > Reply-To: > > > > > > > > > > Hi Mike! > > > > > > > > > > Since commit fa3354e4ea39 (mm: free_area_init: use maximal zone PFNs rather > > > > > than zone sizes), I get the following BUG on Alpha (an AlphaServer ES47 Marvel) > > > > > and loading userspace leads to a segfault: > > > > > > > > > > (I didn't notice this for a long time because of other unrelated regressions, > > > > > the pandemic, changing jobs, ...) > > > > > > > > I suspect there will be more surprises down the road :) > > > > > > > > > BUG: Bad page state in process swapper pfn:2ffc53 > > > > > page:fffffc000ecf14c0 refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 > > > > > flags: 0x0() > > > > > raw: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > > > > > raw: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > > > > > page dumped because: nonzero mapcount Modules linked in: > > > > > CPU: 0 PID: 0 Comm: swapper Not tainted 5.7.0-03841-gfa3354e4ea39-dirty #26 > > > > > fffffc0001b5bd68 fffffc0001b5be80 fffffc00011cd148 fffffc000ecf14c0 > > > > > fffffc00019803df fffffc0001b5be80 fffffc00011ce340 fffffc000ecf14c0 > > > > > 0000000000000000 fffffc0001b5be80 fffffc0001b482c0 fffffc00027d6618 > > > > > fffffc00027da7d0 00000000002ff97a 0000000000000000 fffffc0001b5be80 > > > > > fffffc00011d1abc fffffc000ecf14c0 fffffc0002d00000 fffffc0001b5be80 > > > > > fffffc0001b2350c 0000000000300000 fffffc0001b48298 fffffc0001b482c0 > > > > > Trace: > > > > > [] bad_page+0x168/0x1b0 > > > > > [] free_pcp_prepare+0x1e0/0x290 > > > > > [] free_unref_page+0x2c/0xa0 > > > > > [] cmp_ex_sort+0x0/0x30 > > > > > [] cmp_ex_sort+0x0/0x30 > > > > > [] _stext+0x1c/0x20 > > > > > > > > > > I haven't tried reproducing this on other machines or QEMU, but I'd be glad to > > > > > if that helps. > > > > > > > > If it's reproducible on QEMU I can debug it locally. > > > > > > > > > Any ideas? > > > > > > > > It seems like memory map is not properly initialized. Can you enable > > > > CONFIG_DEBUG_MEMORY_INIT and add mminit_debug=4 to the command line. The > > > > interesting part of the log would be before "Memory: xK/yK available ..." > > > > line. > > > > > > > > Hopefully it'll give some clues. > > > > > > Sure thing. Please find attached. > > > > > aboot: loading uncompressed vmlinuz-5.7.0-03841-gfa3354e4ea39-dirty... > > > aboot: loading compressed vmlinuz-5.7.0-03841-gfa3354e4ea39-dirty... > > > aboot: PHDR 0 vaddr 0xfffffc0001010000 offset 0xc0 size 0x17c5ae0 > > > aboot: bss at 0xfffffc00027d5ae0, size 0xe4ea0 > > > aboot: zero-filling 937632 bytes at 0xfffffc00027d5ae0 > > > aboot: loading initrd (5965252 bytes/5825 blocks) at 0xfffffc05ff2cc000 > > > aboot: starting kernel vmlinuz-5.7.0-03841-gfa3354e4ea39-dirty with arguments ro panic=5 domdadm root=/dev/md1 console=srm mminit_debug=4 > > > Linux version 5.7.0-03841-gfa3354e4ea39-dirty (mattst88@ivybridge) (gcc version 11.1.0 (Gentoo 11.1.0-r2 p3), GNU ld (Gentoo 2.36.1 p3) 2.36.1) #26 SMP Sun Jul 25 18:20:06 PDT 2021 > > > printk: bootconsole [srm0] enabled > > > Booting on Marvel variation Marvel/EV7 using machine vector MARVEL/EV7 from SRM > > > Major Options: SMP EV67 VERBOSE_MCHECK DEBUG_SPINLOCK MAGIC_SYSRQ > > > Command line: ro panic=5 domdadm root=/dev/md1 console=srm mminit_debug=4 > > > memcluster 0, usage 1, start 0, end 1984 > > > memcluster 1, usage 0, start 1984, end 1048576 > > > memcluster 2, usage 1, start 2097152, end 2097224 > > > memcluster 3, usage 0, start 2097224, end 3145728 > > > Initial ramdisk at: 0x(____ptrval____) (5965252 bytes) > > > Found an IO7 at PID 0 > > > Initializing IO7 at PID 0 > > > FIXME: disabling master aborts > > > FIXME: disabling master aborts > > > FIXME: disabling master aborts > > > FIXME: disabling master aborts > > > SMP: 2 CPUs probed -- cpu_present_mask = 3 > > > Zone ranges: > > > DMA [mem 0x0000000000f80000-0x00000fffffffdfff] > > > Normal empty > > > Movable zone start for each node > > > Early memory node ranges > > > node 0: [mem 0x0000000000f80000-0x00000001ffffffff] > > > node 0: [mem 0x0000000400090000-0x00000005ffffffff] > > > > I think that the issue is that memory marked as used in memcluster is never > > added to memblock and it skews node/zone sizing calculations. > > Thanks, this patch fixes it. With the patch applied, I see > > Zone ranges: > DMA [mem 0x0000000000000000-0x00000fffffffdfff] > Normal empty > Movable zone start for each node > Early memory node ranges > node 0: [mem 0x0000000000000000-0x00000001ffffffff] > node 0: [mem 0x0000000400000000-0x00000005ffffffff] > Initmem setup node 0 [mem 0x0000000000000000-0x00000005ffffffff] > > If you want to send me this patch with your S-o-b I'll take it through > my alpha git tree. The patch is on its way :) Now I'm really curios how commit e7793e53901b ("arc: update comment about HIGHMEM implementation") will work out. > Thanks Mike! > Matt -- Sincerely yours, Mike.