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Sep 2024 12:23:47 +0000 Message-ID: <8148432d-5865-49a2-affb-71fe79df2e4e@meta.com> Date: Wed, 18 Sep 2024 14:23:35 +0200 User-Agent: Mozilla Thunderbird Subject: Re: Known and unfixed active data loss bug in MM + XFS with large folios since Dec 2021 (any kernel from 6.1 upwards) From: Chris Mason To: Jens Axboe , Matthew Wilcox Cc: Linus Torvalds , Dave Chinner , Christian Theune , linux-mm@kvack.org, "linux-xfs@vger.kernel.org" , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Dao , regressions@lists.linux.dev, regressions@leemhuis.info References: <0fc8c3e7-e5d2-40db-8661-8c7199f84e43@kernel.dk> <74cceb67-2e71-455f-a4d4-6c5185ef775b@meta.com> <52d45d22-e108-400e-a63f-f50ef1a0ae1a@meta.com> <5bee194c-9cd3-47e7-919b-9f352441f855@kernel.dk> <459beb1c-defd-4836-952c-589203b7005c@meta.com> Content-Language: en-US In-Reply-To: <459beb1c-defd-4836-952c-589203b7005c@meta.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: 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 8/iD4Uwo nqYobDYbzyPx/X7jLsW2s4WA5uRBid4bmFkK/8ImWzNMHLETAGKsq9UNlAajt+wiYzqifqRbD7DSvjp/H0MwnxOU6yy7RKl7ObSbGRU7xhW5TXeVOVatvC1/WInpaM3w2M0oFwZ6FDrqVlUqFYiDRWQBVPPXaUT2w2H0eTfVEy5sPD77Gpjz1aF6xsG8cXnu/LP4VGH1OIJerYnst5eEMlBWSCdeVAZCBzmmnutkfh98xYiL9jm4KU16HCRcXDaEEF6XuS1A+vZYAfax0ubUhvChKcjGF+EyL5/6ntLZgOFBdFgNt40bjEXCWfeDNzCe6DZq53qKAM5pHpZwndP5+L+Hw0FeT1ZeKvDrudtSbQDZkSdrR+Ljysp8asWylCfNWKzoIPoOA5jeC8q+nkCyKsepYZKTlkJ+JU7r8iPH3DzmFemPaAQ3EU8eRGQc7Yaw/LXKfTDkh/+IoGa4sQ5+szkei+7mlOuOEWqWxsLRV9SP0lJKpKa0gvL7d4BV9sDiEXJlq 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 9/18/24 5:28 AM, Chris Mason wrote: > And I attached radixcheck.py if you want to see the full script. Since the attachment didn't actually make it through: #!/usr/bin/env -S drgn -c vmcore from drgn.helpers.linux.fs import * from drgn.helpers.linux.mm import * from drgn.helpers.linux.list import * from drgn.helpers.linux.xarray import * from drgn import * import os import sys import time mapping = Object(prog, 'struct address_space', address=0xffff88a22a9614e8) #p = path_lookup(prog, sys.argv[1]); #mapping = p.dentry.d_inode.i_mapping for index, x in xa_for_each(mapping.i_pages.address_of_()): if xa_is_zero(x): continue if xa_is_value(x): continue page = Object(prog, 'struct page', address=x) folio = Object(prog, 'struct folio', address=x) print("0x%x mapping 0x%x radix index %d page index %d flags 0x%x (%s) size %d" % (page.address_of_(), page.mapping.value_(), index, page.index, page.flags, decode_page_flags(page), folio._folio_nr_pages))