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 Gqx/YDpM r00wWBv00oyly76EBJjuNqgJvOo2D8MXikOBpRPVoxfd4qr25TaXLmeGi3dpwFGeRc/ypyaRsBqCXuB+olm0Y7Py9WlFE9mEFHHYbhTaocLnWvxXOlDiUw== 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 13:02, David Hildenbrand wrote: > 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. Ah, now I get it; at the point int time we check it actually isn't in the pagecache anymore. We perform a folio_test_locked() check before the folio_try_get(), which is wrong as the folio can get freed+reallocated in the meantime. The easy fix would be: diff --git a/mm/filemap.c b/mm/filemap.c index 7c76a123ba18b..f61cf51c22389 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3501,10 +3501,10 @@ static struct folio *next_uptodate_folio(struct xa_state *xas, continue; if (xa_is_value(folio)) continue; - if (folio_test_locked(folio)) - continue; if (!folio_try_get(folio)) continue; + if (folio_test_locked(folio)) + goto skip; /* Has the page moved or been split? */ if (unlikely(folio != xas_reload(xas))) goto skip; -- Cheers, David / dhildenb