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Howlett" To: John Hsu =?utf-8?B?KOioseawuOe/sCk=?= Cc: "maple-tree@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , Andrew Yang =?utf-8?B?KOaliuaZuuW8tyk=?= , Qun-wei Lin =?utf-8?B?KOael+e+pOW0tCk=?= , Chinwen Chang =?utf-8?B?KOW8temMpuaWhyk=?= , Casper Li =?utf-8?B?KOadjuS4reamrik=?= , Kuan-Ying Lee =?utf-8?B?KOadjuWGoOepjik=?= , "akpm@linux-foundation.org" , "yuzhao@google.com" Subject: Re: [BUG] trigger BUG_ON in mas_store_prealloc when low memory Message-ID: <20230613141114.bwbnqsdazqbmyj3u@revolver> Mail-Followup-To: "Liam R. Howlett" , John Hsu =?utf-8?B?KOioseawuOe/sCk=?= , "maple-tree@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , Andrew Yang =?utf-8?B?KOaliuaZuuW8tyk=?= , Qun-wei Lin =?utf-8?B?KOael+e+pOW0tCk=?= , Chinwen Chang =?utf-8?B?KOW8temMpuaWhyk=?= , Casper Li =?utf-8?B?KOadjuS4reamrik=?= , Kuan-Ying Lee =?utf-8?B?KOadjuWGoOepjik=?= , "akpm@linux-foundation.org" , "yuzhao@google.com" References: <9cb8c599b1d7f9c1c300d1a334d5eb70ec4d7357.camel@mediatek.com> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <9cb8c599b1d7f9c1c300d1a334d5eb70ec4d7357.camel@mediatek.com> User-Agent: NeoMutt/20220429 X-ClientProxiedBy: YT4PR01CA0173.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:110::14) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|CO1PR10MB4484:EE_ X-MS-Office365-Filtering-Correlation-Id: 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 cxpNC5Of 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Thanks for reporting this issue. > We met BUG_ON in mas_store_prealloc with kernel-6.1 stress testing > environment. version 6.1 or 6.1.x? Which exact version (git id or version number) > According to coredump, BUG_ON is triggered by mas->node with error > number -ENOMEM(0xffffffffffffffd2). > There are some mas_node_count functions in mas_wr_store_entry, and it > seems that mas->node may be set to error node with -ENOMEM if there was > no enough memory spcace for maple tree operations. > We think that return -ENOMEM instead of directly triggering BUG_ON when > memory is not available is suitable, This BUG_ON() is necessary since this function should _never_ run out of memory; this function does not return an error code. mas_preallocate() should have gotten you the memory necessary (or returned an -ENOMEM) prior to the call to mas_store_prealloc(), so this is probably an internal tree problem. >because in reality the tree > operation shouldn't be performed in this situation. There is a tree operation being performed here. mprotect is merging a vma by the looks of the call stack. Why do you think no tree operation is necessary? >=20 > following are the backtrace: > mas_store_prealloc+0x23c/0x484 > vma_mas_store+0xe4/0x2d0 > __vma_adjust+0xab0/0x1470 > vma_merge+0x5b8/0x5d4 > mprotect_fixup+0x1f4/0x478 > __arm64_sys_mprotect+0x6b0/0x8f0 > invoke_syscall+0x84/0x264 > el0_svc_common+0x118/0x1f0 > do_el0_svc+0x5c/0x184 > el0_svc+0x38/0x98 I see this is arm64. Do you have a reproducer? If you don't have a reproducer, I can try stress-ng on amr64 to simulate your workload using mprotect, but I need to know the exact kernel version as this issue may have been fixed in a later stable release. Thanks, Liam