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tt3u1vQjaT/ajM7Kry7kMr+wzfsDZOKNzS/FO/qILXhpCy3SFYCket3+YZBPilEDGcV4cm9/mrWiKw23pnkKQIfvldIHcV9QscIZI8Z2rrP+tvBR7O3gSQfhpT2BE3hD4FM24eFzA1S4M/G8wZdPEA8mJ+hG/BqtiEJxeZw8IpY5sWFog8/Een9dHLtlLTxmIzRZ6OM60KrYVq4aDrAdCPrEeq+W1Pd8CpXslsfW2OdDHsIBf9RAv1ulwy7rUCHWBqhku5qatZqiDqmfwzZCtrm8Ix9s5px2 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 23.09.25 18:22, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: b5db4add5e77 Merge branch 'for-next/core' into for-kernelci > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > console output: https://syzkaller.appspot.com/x/log.txt?x=10edb8e2580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d2ae34a0711ff2f1 > dashboard link: https://syzkaller.appspot.com/bug?extid=e6367ea2fdab6ed46056 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > userspace arch: arm64 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14160f12580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1361627c580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/6eee2232d5c1/disk-b5db4add.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/a8b00f2f1234/vmlinux-b5db4add.xz > kernel image: https://storage.googleapis.com/syzbot-assets/fc0d466f156c/Image-b5db4add.gz.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+e6367ea2fdab6ed46056@syzkaller.appspotmail.com > > Injecting memory failure for pfn 0x104000 at process virtual address 0x20000000 > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 6700 at mm/memory-failure.c:2391 memory_failure+0x18ec/0x1db4 mm/memory-failure.c:2391 > Modules linked in: > CPU: 1 UID: 0 PID: 6700 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 > pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) > pc : memory_failure+0x18ec/0x1db4 mm/memory-failure.c:2391 > lr : memory_failure+0x18ec/0x1db4 mm/memory-failure.c:2391 > sp : ffff8000a41478c0 > x29: ffff8000a41479a0 x28: 05ffc00000200868 x27: ffff700014828f20 > x26: 1fffffbff8620001 x25: 05ffc0000020086d x24: 1fffffbff8620000 > x23: fffffdffc3100008 x22: fffffdffc3100000 x21: fffffdffc3100000 > x20: 0000000000000023 x19: dfff800000000000 x18: 1fffe00033793888 > x17: ffff80008f7ee000 x16: ffff80008052aa64 x15: 0000000000000001 > x14: 1fffffbff8620000 x13: 0000000000000000 x12: 0000000000000000 > x11: ffff7fbff8620001 x10: 0000000000ff0100 x9 : 0000000000000000 > x8 : ffff0000d7eedb80 x7 : ffff800080428910 x6 : 0000000000000000 > x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff800080cf5438 > x2 : 0000000000000001 x1 : 0000000000000040 x0 : 0000000000000000 > Call trace: > memory_failure+0x18ec/0x1db4 mm/memory-failure.c:2391 (P) > madvise_inject_error mm/madvise.c:1475 [inline] > madvise_do_behavior+0x2c8/0x7c4 mm/madvise.c:1875 > do_madvise+0x190/0x248 mm/madvise.c:1978 > __do_sys_madvise mm/madvise.c:1987 [inline] > __se_sys_madvise mm/madvise.c:1985 [inline] > __arm64_sys_madvise+0xa4/0xc0 mm/madvise.c:1985 > __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] > invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 > el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 > do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 > el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744 > el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 We're running into the WARN_ON(folio_test_large(folio)); in memory_failure(). Which is weird because we have the if (folio_test_large(folio)) { /* * The flag must be set after the refcount is bumped * otherwise it may race with THP split. * And the flag can't be set in get_hwpoison_page() since * it is called by soft offline too and it is just called * for !MF_COUNT_INCREASED. So here seems to be the best * place. * * Don't need care about the above error handling paths for * get_hwpoison_page() since they handle either free page * or unhandlable page. The refcount is bumped iff the * page is a valid handlable page. */ folio_set_has_hwpoisoned(folio); if (try_to_split_thp_page(p, false) < 0) { res = -EHWPOISON; kill_procs_now(p, pfn, flags, folio); put_page(p); action_result(pfn, MF_MSG_UNSPLIT_THP, MF_FAILED); goto unlock_mutex; } VM_BUG_ON_PAGE(!page_count(p), p); folio = page_folio(p); } before it. But likely that's what I raised to Zi Yan recently: if try_to_split_thp_page()->split_huge_page() silently decided to split to something that is not a small folio (the min_order_for_split() bit), this changed the semantics of the function. Likely split_huge_page() should have failed if the min_order makes us not split to order-0, or there would have to be some "parameter" that tells split_huge_page() what expectation (order) the callers has. We can check folio_test_large() after the split, but really, we should just not be splitting at all if it doesn't serve our purpose. -- Cheers David / dhildenb