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Tue, 10 Jan 2023 14:53:47 +0000 (GMT) From: Sven Schnelle To: Liam Howlett Cc: "maple-tree@lists.infradead.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Andrew Morton , linux-s390@vger.kernel.org Subject: Re: [PATCH v2 10/44] mmap: Change do_mas_munmap and do_mas_aligned_munmap() to use vma iterator References: <20230105191517.3099082-1-Liam.Howlett@oracle.com> <20230105191517.3099082-11-Liam.Howlett@oracle.com> Date: Tue, 10 Jan 2023 15:53:46 +0100 In-Reply-To: <20230105191517.3099082-11-Liam.Howlett@oracle.com> (Liam Howlett's message of "Thu, 5 Jan 2023 19:15:55 +0000") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: ZW3fIRnXvRt9_XARSGE00WVjgzoctkTZ X-Proofpoint-GUID: ZW3fIRnXvRt9_XARSGE00WVjgzoctkTZ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2023-01-10_06,2023-01-10_03,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 impostorscore=0 mlxscore=0 adultscore=0 lowpriorityscore=0 phishscore=0 mlxlogscore=702 bulkscore=0 malwarescore=0 priorityscore=1501 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301100090 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: BB40740010 X-Stat-Signature: m5iqydxn7mmu8mz4dmbbtxbb4uj4wfbh X-Rspam-User: X-HE-Tag: 1673362432-668991 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Liam Howlett writes: > From: "Liam R. Howlett" > > Start passing the vma iterator through the mm code. This will allow for > reuse of the state and cleaner invalidation if necessary. > > Signed-off-by: Liam R. Howlett > --- > include/linux/mm.h | 2 +- > mm/mmap.c | 77 +++++++++++++++++++++------------------------- > mm/mremap.c | 6 ++-- > 3 files changed, 39 insertions(+), 46 deletions(-) > Starting with this patch i see the following oops on s390: [ 4.512863] Run /sbin/init as init process [ 4.519447] Unable to handle kernel pointer dereference in virtual kernel address space [ 4.519450] Failing address: fbebfffb00000000 TEID: fbebfffb00000803 [ 4.519452] Fault in home space mode while using kernel ASCE. [ 4.519455] AS:0000000001a60007 R3:0000000000000024 [ 4.519482] Oops: 0038 ilc:2 [#1] SMP [ 4.519486] Modules linked in: [ 4.519488] CPU: 7 PID: 1 Comm: init Not tainted 6.2.0-rc1-00179-ga7f83eb601ef #1582 [ 4.519491] Hardware name: IBM 3906 M04 704 (z/VM 7.1.0) [ 4.519493] Krnl PSW : 0704c00180000000 0000000000929464 (__memcpy+0x24/0x50) [ 4.519503] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3 [ 4.519506] Krnl GPRS: 0000000000000000 0000037fffb1f990 0000037fffb1f990 fbebfffb00000008 [ 4.519509] 0000000000000007 0000000000929480 0000000000000008 0000000000000000 [ 4.519517] 0000000000000009 0000037fffb1fb40 0000037fffb1f880 0000037fffb1fc58 [ 4.519519] 0000000080288000 0000000000000001 0000000000cf65da 0000037fffb1f5d8 [ 4.519527] Krnl Code: 0000000000929456: b9040012 lgr %r1,%r2 [ 4.519527] 000000000092945a: a7740008 brc 7,000000000092946a [ 4.519527] #000000000092945e: c05000000011 larl %r5,0000000000929480 [ 4.519527] >0000000000929464: 44405000 ex %r4,0(%r5) [ 4.519527] 0000000000929468: 07fe bcr 15,%r14 [ 4.519527] 000000000092946a: d2ff10003000 mvc 0(256,%r1),0(%r3) [ 4.519527] 0000000000929470: 41101100 la %r1,256(%r1) [ 4.519527] 0000000000929474: 41303100 la %r3,256(%r3) [ 4.519547] Call Trace: [ 4.519548] [<0000000000929464>] __memcpy+0x24/0x50 [ 4.519557] [<0000000000cfd474>] mas_wr_bnode+0x5c/0x14e8 [ 4.519562] [<0000000000cffaf6>] mas_store_prealloc+0x4e/0xf8 [ 4.519569] [<000000000039d262>] mmap_region+0x482/0x8b0 [ 4.519572] [<000000000039da6e>] do_mmap+0x3de/0x4c0 [ 4.519575] [<000000000036aeae>] vm_mmap_pgoff+0xd6/0x188 [ 4.519580] [<000000000039a18a>] ksys_mmap_pgoff+0x62/0x230 [ 4.519584] [<000000000039a522>] __s390x_sys_old_mmap+0x7a/0x98 [ 4.519588] [<0000000000d22650>] __do_syscall+0x1d0/0x1f8 [ 4.519592] [<0000000000d32712>] system_call+0x82/0xb0 [ 4.519596] Last Breaking-Event-Address: [ 4.519596] [<0000000000cf65d4>] mas_store_b_node+0x3cc/0x6b0 [ 4.519603] Kernel panic - not syncing: Fatal exception: panic_on_oops This happens on every boot, always killing the init process. The oops doesn't happen with next-20230110. With next-20230110 i see shmat testcase failures in ltp (shmat returning with -EINVAL because find_vma_intersection() tells shmat that there's already a mapping present). Trying to bisect that i stumbled above the oops above. Any ideas before i start trying to understand the patch? Thanks, Sven