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b=Z90uYUSzH0W43TFs7w0PYTRMKh3kcbMy5/DQqV/i3rUAt2Lta9+TeWmnD9R5e06bq AZicyFf+T1IdalCf93SV0KeE5wAwVisxNS4ImEA3n4khQ4yxLQf0P8qUoIiaUpazv1 d7Wa7tD0Y5EbgTWL2VCjbmr8L25VCZrXLJ3l4hoA= Date: Tue, 26 Mar 2024 12:56:23 -0700 From: Andrew Morton To: Feng Tang Cc: Borislav Petkov , "V, Narasimhan" , "linux-next@vger.kernel.org" , "linux-mm@kvack.org" , "Aithal, Srikanth" , Dawei Li , Andy Shevchenko , Rasmus Villemoes , Yury Norov , lkml , Vlastimil Babka Subject: Re: Boot failure with kernel BUG at mm/usercopy.c on next-20240325 Message-Id: <20240326125623.266550b81bb36aafc9a2c613@linux-foundation.org> In-Reply-To: References: <20240325125017.GBZgFzCXVxeF50uGVE@fat_crate.local> <20240325113433.e04c2b508ac325630cd113c8@linux-foundation.org> <20240325203714.GJZgHgem2TR1aVAVlU@fat_crate.local> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 536F9A0011 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: wqpa8hh4wiy94uz1zgydnfrtx11wimng X-HE-Tag: 1711482986-316561 X-HE-Meta: U2FsdGVkX19j93PiXF96LXMlLpU3JSziRzmQe0EZWni+tNRoN5CZFmQhFq8XOpb9Wyi64DHKP8NIs0dvpLUGoP4sJC4lcv1MCSxz+dyXlqko5eQpeVbb/G1cFPVW+ckCn8BssG5R6aTSLYJlugR2R3qlKlJXkaSV2RSVFsBvums8yLt/8vWUBosKMKol6Zto9WV8PgWKoHU+vpHlrZ7DDJTUjaOeXeMDSwNqHhni63184abhUGekyapfgdv5ZOthNHflopaRA0iTnnoEbqJWfnajvcZLShniC235zPEa+O1L5dYUo77bgnh5T1hVNt1R63nyTdD8hUQivkt2fsX+nAFUlG8Ia4aBPAsYEm/ImcsQDEApm7qbCtOZ5rl3xKysufEtc3p6AKg2xvAZeUxHvsCj7b0DWjkCusEGayDsVZCBmM7ejPLmtzEhydpmqOolc0B7ZJlGVCDidSrCKsBU0Q4BNTQTFPorZZgT5kPYTJJ18vtbmJFKSVydp99DFQ9mdKilkhEZDzfUXKF/ea6VJZb9p7xJITQWfafqALV8a2VNN0aNyrwAEQ1SUsBlgEobwpZ03YZ1gg1zcJnjscDDbp9FQr/Uxj8PC9f7UNUtKsCd3FB2ymnVjqcukBkWksdLfiliC7CDnAvJgKeYmOD4X/zdAhv6H3DRo/yH8kIeYTRSpaqK3nAP1pyixS0jejPHl7MYhAFJr+uDbqUCv4S5IGWMbrou2O3qh9ZVTnzfku3NNBLYC6qvi9nG5+q4w108HR93cwysmwrgIQuIrJPL+wmQUimqtXHUVPncuGHVZqpo1GPn8m4N3oKTCumzSv78nzSENGAsJtVadpRuNtFSywEuksxvq2uFQRWUK59XudVBfOZd5Uu9bFccFtPfMoWRNZ3K1iK0Ib9bw08tu6WhbsvVB678qvOyzhtkm2GW9jl22oEjqEpU2cmPD/yTuKJxmGbeBmml8LkUrSI6EEC wDVg1gov PxdoRVYIJhImVKhL3nwOK3H2q9BM6lGjL8XBhFwBZu9Beh0RsvkQQMt2B2EGVrz6/titm9wti331IRm1KJG4lvkvJBrKEKqLZeRko/ZdpgMeC480+0fgGws+rYGLuiJ8A22RYOQI3RDAu2zRQGB1PV/z9KomWXLQDmtdk7hICtabYVlosnum+0/pQb0RC2DzlCZZilWGt2i5NKLeFbPD0TVr9TWIGZ4P/C207a6bC2PAgYOivGHrBOkrEpALicl5WzsuhubSKyg16yqqgQsUfbvK+8QMOvN5QNjFiPRj2FE6QLiMhW20aQY7rqxiuXgs3rJFyq6uVCgEZuttDsQG8VwEVA/9t+zYZ22BPEna3iF2B+aneCkFWnnT41+55fdUuk0/WQYGN1CVrEdm6Gy6xqIOegHt9MHGOftisK4C6svu7n19B0K6VGDYCy7Sm3ziJSQSN 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: List-Subscribe: List-Unsubscribe: On Tue, 26 Mar 2024 10:30:10 +0800 Feng Tang wrote: > Add Vlastimil for slab related topic. > > On Tue, Mar 26, 2024 at 04:37:14AM +0800, Borislav Petkov wrote: > > On Mon, Mar 25, 2024 at 11:34:33AM -0700, Andrew Morton wrote: > > > Thanks, I'll just drop the patch. It didn't receive a very favorable > > > review reception anyway. > > > > See here: > > > > https://lore.kernel.org/all/DM4PR12MB5086B9BDBF32D53DF226CBF489362@DM4PR12MB5086.namprd12.prod.outlook.com/ > > > > folks still need to learn email. :-) > > > > Anyway, apparently there's some fix there. > > The original commit 328c801335d5 ("cpumask: create dedicated kmem > cache for cpumask var") has some benefit, that there are CPU numbers > which are not power of 8, like 144, 288 etc where it will save > some memory. > > And 'slabtop' on a qemu-VM with 16 cpus shows it is surprisingly > non-trivial and has the third largest number of objects: > > 22350 22350 100% 0.13K 745 30 2980K kernfs_node_cache > 11172 10693 0% 0.19K 266 42 2128K dentry > 10240 8222 0% 0.01K 20 512 80K cpumask > > Andrew, if it is worth merging, you can folder my fix into the patch. I'll await a resend, please.