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Fri, 31 May 2024 13:43:16 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id BjXxLPTTWWa/aQAAD6G6ig (envelope-from ); Fri, 31 May 2024 13:43:16 +0000 Message-ID: <58ec2870-1414-48a4-a903-584ceaf91049@suse.cz> Date: Fri, 31 May 2024 15:43:16 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: page type is 3, passed migratetype is 1 (nr=512) Content-Language: en-US To: Johannes Weiner , Christoph Hellwig Cc: Andy Shevchenko , Baolin Wang , linux-mm@kvack.org, Andrew Morton , Zi Yan , Mel Gorman References: <20240528164756.GA2820@cmpxchg.org> <20240529162830.GA1049743@cmpxchg.org> <20240530010419.GA1132939@cmpxchg.org> <20240530114203.GA1222079@cmpxchg.org> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJkBREIBQkRadznAAoJECJPp+fMgqZkNxIQ ALZRqwdUGzqL2aeSavbum/VF/+td+nZfuH0xeWiO2w8mG0+nPd5j9ujYeHcUP1edE7uQrjOC Gs9sm8+W1xYnbClMJTsXiAV88D2btFUdU1mCXURAL9wWZ8Jsmz5ZH2V6AUszvNezsS/VIT87 AmTtj31TLDGwdxaZTSYLwAOOOtyqafOEq+gJB30RxTRE3h3G1zpO7OM9K6ysLdAlwAGYWgJJ V4JqGsQ/lyEtxxFpUCjb5Pztp7cQxhlkil0oBYHkudiG8j1U3DG8iC6rnB4yJaLphKx57NuQ PIY0Bccg+r9gIQ4XeSK2PQhdXdy3UWBr913ZQ9AI2usid3s5vabo4iBvpJNFLgUmxFnr73SJ KsRh/2OBsg1XXF/wRQGBO9vRuJUAbnaIVcmGOUogdBVS9Sun/Sy4GNA++KtFZK95U7J417/J Hub2xV6Ehc7UGW6fIvIQmzJ3zaTEfuriU1P8ayfddrAgZb25JnOW7L1zdYL8rXiezOyYZ8Fm ZyXjzWdO0RpxcUEp6GsJr11Bc4F3aae9OZtwtLL/jxc7y6pUugB00PodgnQ6CMcfR/HjXlae h2VS3zl9+tQWHu6s1R58t5BuMS2FNA58wU/IazImc/ZQA+slDBfhRDGYlExjg19UXWe/gMcl De3P1kxYPgZdGE2eZpRLIbt+rYnqQKy8UxlszsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZAUSmwUJDK5EZgAKCRAiT6fnzIKmZOJGEACOKABgo9wJXsbWhGWYO7mD 8R8mUyJHqbvaz+yTLnvRwfe/VwafFfDMx5GYVYzMY9TWpA8psFTKTUIIQmx2scYsRBUwm5VI EurRWKqENcDRjyo+ol59j0FViYysjQQeobXBDDE31t5SBg++veI6tXfpco/UiKEsDswL1WAr tEAZaruo7254TyH+gydURl2wJuzo/aZ7Y7PpqaODbYv727Dvm5eX64HCyyAH0s6sOCyGF5/p eIhrOn24oBf67KtdAN3H9JoFNUVTYJc1VJU3R1JtVdgwEdr+NEciEfYl0O19VpLE/PZxP4wX PWnhf5WjdoNI1Xec+RcJ5p/pSel0jnvBX8L2cmniYnmI883NhtGZsEWj++wyKiS4NranDFlA HdDM3b4lUth1pTtABKQ1YuTvehj7EfoWD3bv9kuGZGPrAeFNiHPdOT7DaXKeHpW9homgtBxj 8aX/UkSvEGJKUEbFL9cVa5tzyialGkSiZJNkWgeHe+jEcfRT6pJZOJidSCdzvJpbdJmm+eED w9XOLH1IIWh7RURU7G1iOfEfmImFeC3cbbS73LQEFGe1urxvIH5K/7vX+FkNcr9ujwWuPE9b 1C2o4i/yZPLXIVy387EjA6GZMqvQUFuSTs/GeBcv0NjIQi8867H3uLjz+mQy63fAitsDwLmR EP+ylKVEKb0Q2A== In-Reply-To: <20240530114203.GA1222079@cmpxchg.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: B15DF180014 X-Stat-Signature: h89empqyxygm6beyc9seqnf1iy75fbjg X-HE-Tag: 1717162999-663776 X-HE-Meta: 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 MDxD9XYk jXSoYwk9GSwGjPzHju2pV/D4PoiZc55Zn4TmCqrdV0lwz5KmBnpGfgoMbHaFtjLbql+9RkbyxHnoPJQNHHs8WdRXQe2FKLyEfa1vHQIfTH7le3UhOjdj/sUPd4M1JoE9X+i7VnvicXtlQCb8DICPsIGtNKIK2xOjPtrL3I0FxARjX86fi413Ql02a0Z9Uz1i4ryjZaNIpXkSesIjCw+kgzMxE04KZpFgIA2FnRw1dpvWDlK4lbE7B9OTYNBqFaw+11DXL+6XNT+uv+2nUkiot+02+/dDj+CHXiY5xZ1PfobnVSX2svopNjLtLtH6FElaSAxHuPjcoUbAv2tBRTJa8hPLvbfo1XWOhlBZv6fPICvgPRT6xa63kIfZYCRMh9lqTiMx9 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 5/30/24 1:42 PM, Johannes Weiner wrote: > On Wed, May 29, 2024 at 09:04:25PM -0400, Johannes Weiner wrote: >> Subject: [PATCH] mm: page_alloc: fix highatomic typing in multi-block buddies > > Argh, I dropped the reserve_highatomic_pageblock() caller update when > removing the printks right before sending out. My apologies. Here is > the fixed version: > > --- > > From 6aa9498ee0d7161b0605251116d16b18cd448552 Mon Sep 17 00:00:00 2001 > From: Johannes Weiner > Date: Wed, 29 May 2024 18:18:12 -0400 > Subject: [PATCH] mm: page_alloc: fix highatomic typing in multi-block buddies > > Christoph reports a page allocator splat triggered by xfstests: > > generic/176 214s ... [ 1204.507931] run fstests generic/176 at 2024-05-27 12:52:30 > [] XFS (nvme0n1): Mounting V5 Filesystem cd936307-415f-48a3-b99d-a2d52ae1f273 > [] XFS (nvme0n1): Ending clean mount > [] XFS (nvme1n1): Mounting V5 Filesystem ab3ee1a4-af62-4934-9a6a-6c2fde321850 > [] XFS (nvme1n1): Ending clean mount > [] XFS (nvme1n1): Unmounting Filesystem ab3ee1a4-af62-4934-9a6a-6c2fde321850 > [] XFS (nvme1n1): Mounting V5 Filesystem 7099b02d-9c58-4d1d-be1d-2cc472d12cd9 > [] XFS (nvme1n1): Ending clean mount > [] ------------[ cut here ]------------ > [] page type is 3, passed migratetype is 1 (nr=512) > [] WARNING: CPU: 0 PID: 509870 at mm/page_alloc.c:645 expand+0x1c5/0x1f0 > [] Modules linked in: i2c_i801 crc32_pclmul i2c_smbus [last unloaded: scsi_debug] > [] CPU: 0 PID: 509870 Comm: xfs_io Not tainted 6.10.0-rc1+ #2437 > [] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > [] RIP: 0010:expand+0x1c5/0x1f0 > [] Code: 05 16 70 bf 02 01 e8 ca fc ff ff 8b 54 24 34 44 89 e1 48 c7 c7 80 a2 28 83 48 89 c6 b8 01 00 3 > [] RSP: 0018:ffffc90003b2b968 EFLAGS: 00010082 > [] RAX: 0000000000000000 RBX: ffffffff83fa9480 RCX: 0000000000000000 > [] RDX: 0000000000000005 RSI: 0000000000000027 RDI: 00000000ffffffff > [] RBP: 00000000001f2600 R08: 00000000fffeffff R09: 0000000000000001 > [] R10: 0000000000000000 R11: ffffffff83676200 R12: 0000000000000009 > [] R13: 0000000000000200 R14: 0000000000000001 R15: ffffea0007c98000 > [] FS: 00007f72ca3d5780(0000) GS:ffff8881f9c00000(0000) knlGS:0000000000000000 > [] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [] CR2: 00007f72ca1fff38 CR3: 00000001aa0c6002 CR4: 0000000000770ef0 > [] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7: 0000000000000400 > [] PKRU: 55555554 > [] Call Trace: > [] > [] ? __warn+0x7b/0x120 > [] ? expand+0x1c5/0x1f0 > [] ? report_bug+0x191/0x1c0 > [] ? handle_bug+0x3c/0x80 > [] ? exc_invalid_op+0x17/0x70 > [] ? asm_exc_invalid_op+0x1a/0x20 > [] ? expand+0x1c5/0x1f0 > [] ? expand+0x1c5/0x1f0 > [] __rmqueue_pcplist+0x3a9/0x730 > [] get_page_from_freelist+0x7a0/0xf00 > [] __alloc_pages_noprof+0x153/0x2e0 > [] __folio_alloc_noprof+0x10/0xa0 > [] __filemap_get_folio+0x16b/0x370 > [] iomap_write_begin+0x496/0x680 > > While trying to service a movable allocation (page type 1), the page > allocator runs into a two-pageblock buddy on the movable freelist > whose second block is typed as highatomic (page type 3). > > This inconsistency is caused by the highatomic reservation system > operating on single pageblocks, while MAX_ORDER can be bigger than > that - in this configuration, pageblock_order is 9 while > MAX_PAGE_ORDER is 10. The test case is observed to make several > adjacent order-3 requests with __GFP_DIRECT_RECLAIM cleared, which > marks the surrounding block as highatomic. Upon freeing, the blocks > merge into an order-10 buddy. When the highatomic pool is drained > later on, this order-10 buddy gets moved back to the movable list, but > only the first pageblock is marked movable again. A subsequent > expand() of this buddy warns about the tail being of a different type. > > This is a long-standing bug that's surfaced by the recent block type > warnings added to the allocator. The consequences seem mostly benign, > it just results in odd behavior: the highatomic tail blocks are not > properly drained, instead they end up on the movable list first, then > go back to the highatomic list after an alloc-free cycle. > > To fix this, make the highatomic reservation code aware that > allocations/buddies can be larger than a pageblock. > > While it's an old quirk, the recently added type consistency warnings > seem to be the most prominent consequence of it. Set the Fixes: tag > accordingly to highlight this backporting dependency. > > Fixes: e0932b6c1f94 ("mm: page_alloc: consolidate free page accounting") > Reported-by: Christoph Hellwig > Signed-off-by: Johannes Weiner Looks good, thanks. Reviewed-by: Vlastimil Babka