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[2003:cb:c714:1600:f3b:67cc:3b88:620e]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434b0f70cbfsm20270215e9.36.2024.11.28.04.02.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 28 Nov 2024 04:02:03 -0800 (PST) Message-ID: <1176656f-96a8-4e99-a4c2-7354b7cfd03c@redhat.com> Date: Thu, 28 Nov 2024 13:02:02 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] kernel BUG in const_folio_flags (2) To: Hillf Danton Cc: syzbot , linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, Matthew Wilcox References: <674184c9.050a0220.1cc393.0001.GAE@google.com> <20241128114249.1903-1-hdanton@sina.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp 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LVPa7rR+BXxyrGacvpCaYMKB+x7FGLWM2AIfhyaF/GSHy+xHpgMs8WPTlUdJARWK7vBR4Af0SHskk4bSaNZzJ4FpG0g7CdOzGiw3cnwQI7xFWNLYs53l4A== 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 28.11.24 12:42, Hillf Danton wrote: > On Thu, 28 Nov 2024 11:52:42 +0100 David Hildenbrand >> On 23.11.24 08:31, syzbot wrote: >>> Hello, >>> >>> syzbot found the following issue on: >>> >>> HEAD commit: 9fb2cfa4635a Merge tag 'pull-ufs' of git://git.kernel.org/.. >>> git tree: upstream >>> console output: https://syzkaller.appspot.com/x/log.txt?x=10042930580000 >>> kernel config: https://syzkaller.appspot.com/x/.config?x=c4515f1b6a4e50b7 >>> dashboard link: https://syzkaller.appspot.com/bug?extid=9f9a7f73fb079b2387a6 >>> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 >>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=105ff2e8580000 >>> >>> Downloadable assets: >>> disk image: https://storage.googleapis.com/syzbot-assets/7c0c61a15f60/disk-9fb2cfa4.raw.xz >>> vmlinux: https://storage.googleapis.com/syzbot-assets/3363d84eeb74/vmlinux-9fb2cfa4.xz >>> kernel image: https://storage.googleapis.com/syzbot-assets/2b1a270af550/bzImage-9fb2cfa4.xz >>> >>> IMPORTANT: if you fix the issue, please add the following tag to the commit: >>> Reported-by: syzbot+9f9a7f73fb079b2387a6@syzkaller.appspotmail.com >>> >> >> Staring at the console output: >> >> [ 520.222112][ T7269] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x1403 pfn:0x125be > > ->mapping is cleared for a order9 page > >> [ 520.362213][ T7269] head: order:9 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 >> [ 520.411963][ T7269] memcg:ffff88807c73c000 >> [ 520.492069][ T7269] flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) >> [ 520.499844][ T7269] raw: 00fff00000000000 ffffea0000490001 dead000000000122 dead000000000400 >> [ 520.551982][ T7269] raw: 00000000000014d0 0000000000000000 00000000ffffffff 0000000000000000 >> [ 520.560912][ T7269] head: 00fff00000000040 0000000000000000 dead000000000122 0000000000000000 >> [ 520.672020][ T7269] head: 0000000000001245 0000000000000000 00000001ffffffff ffff88807c73c000 >> [ 520.735699][ T7269] head: 00fff00000000209 ffffea0000490001 ffffffffffffffff 0000000000000000 >> [ 520.901989][ T7269] head: 0000000000000200 0000000000000000 00000000ffffffff 0000000000000000 >> [ 520.991952][ T7269] page dumped because: VM_BUG_ON_PAGE(PageTail(page)) >> [ 521.086487][ T7269] page_owner tracks the page as allocated >> [ 521.132208][ T7269] page last allocated via order 0, migratetype Movable, gfp_mask 0x3d24ca(GFP_TRANSHUGE|__GFP_NORETRY| >> >> ^order 0 looks wrong, but let;s not get distracted. >> >> __GFP_THISNODE), pid 7321, tgid 7321 (syz.1.194), ts 520201520231, free_ts 520193076092 >> [ 521.272012][ T7269] post_alloc_hook+0x2d1/0x350 >> [ 521.276977][ T7269] __alloc_pages_direct_compact+0x20e/0x590 >> [ 521.314428][ T7269] __alloc_pages_noprof+0x182b/0x25a0 >> [ 521.319975][ T7269] alloc_pages_mpol_noprof+0x282/0x610 >> [ 521.420092][ T7269] folio_alloc_mpol_noprof+0x36/0xd0 >> [ 521.483167][ T7269] vma_alloc_folio_noprof+0xee/0x1b0 >> [ 521.539677][ T7269] do_huge_pmd_anonymous_page+0x258/0x2ae0 >> ... >> [ 521.851719][ T7269] page last free pid 7323 tgid 7321 stack trace: >> [ 521.972611][ T7269] free_unref_folios+0xa87/0x14f0 >> [ 521.977735][ T7269] folios_put_refs+0x587/0x7b0 >> [ 522.072508][ T7269] folio_batch_move_lru+0x2c4/0x3b0 >> [ 522.077794][ T7269] __folio_batch_add_and_move+0x35b/0xc60 >> [ 522.191992][ T7269] reclaim_folio_list+0x205/0x3a0 >> [ 522.197131][ T7269] reclaim_pages+0x481/0x650 >> [ 522.201760][ T7269] madvise_cold_or_pageout_pte_range+0x163b/0x20d0 >> ... >> >> >> So we allocated a order-9 anonymous folio, but suddenly find it via shmem in the pagecache? >> >> Is this some crazy use-after-free / double-free, where we end up freeing a shmem folio >> that is still in the pagecache? Once freed, it gets merged in the buddy, and we then re-allocate >> it as part of a PMD THP; but shmem still finds it in the pagecache, and as the it's now suddenly > > It is not in the pagecache. next_uptodate_folio() finds it there? Which is .. via the pagecache xas_next_entry()? But good point on the mapping. If we would have freed a folio while still in the pagecache (before truncation), we'd likely have gotten an error from free_page_is_bad(). Well, unless check_pages_enabled() is false. -- Cheers, David / dhildenb