From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C63742D4813 for ; Sun, 28 Sep 2025 10:54:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759056868; cv=none; b=vBRl2DAXMqVotesSawSGiUv5bpbGOh1rTihy9DQXfYeVUXhGaTLEhvr6h0r+q5Wt2ZqQu5tbsh53fLY2gFQr0sSy44DBG5TOCc2EZUaShzSnz4B/nv12POieH6Fc2SSKng3VQEsxFkzBdNQCUD8sXB/cN1Hhyv4MZk+MjRtNW/k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759056868; c=relaxed/simple; bh=A9zRhQtNo8Re/2JNSAP8Kfhz8tWPbrgh6vubwD0r28o=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=iElvcPaxzz198/UlRFGnF2thTBLBGf2GwuL295PLQMIebwnFtc4eqLA4JpAIfcbv8pu5pd0sors8vhaqXetssMEGz5pDgPRXch4SivaBVlKmZL6rQJse1u52nz0YJ/oaKWjBt7xpIVF5pgpWh0FYT6RtnBa/f5/ZcvqhXtESt0U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.205 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f205.google.com with SMTP id e9e14a558f8ab-42628f7c151so74354025ab.0 for ; Sun, 28 Sep 2025 03:54:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759056866; x=1759661666; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=sG7EmFMTWYKDYn47cpx5DkN1WXCeji+FBkhG0W1ANI4=; b=tTA85id6to2XKjfHVbvj6WWlk7VkMBg4C8VcX3r/75mW00Z14m/tdhnNvWSz08OXpa /ohfiLRcUjIiS0j2Lrlq3ZaHy7gfsBbTtQS+R1E6tdkIDSoGkbvPIMF4HHbuhe/tl8jG JXDk9akE6yg61t9Cg3V0qzcO/5mdxtfUkzXv15fto0fHC3SRNZ/wW9JjAqeaqRN5a7cq e8iCwsXYgin4MnioGD7HJP8FFJmFRziRFg3VD4up4zzefao+qlRZZCtc/LQpmMZdnURm nhEAKe+uzVtgMDawc713UC74PSdxAzaPTAXeqmrPPhWXD0lwzR1N7t7CaY9qzoGjllDd exUA== X-Forwarded-Encrypted: i=1; AJvYcCXv+O+Ef+pZW4rDOE5OXxXqnYZGwVKx64ZVO6ZWuiY92m9+Miy02KuvNvCZZsVPqZVlsXvwvZUDpqwmdq8=@vger.kernel.org X-Gm-Message-State: AOJu0YyyD52TyJnM6cB7wzUMhXhpAjuC5G6FHDobngwKJKI+m4Y49Qf7 s9vZyIVqHj+MHmqg2UBYzzoN45fwHRWhPGQibf0uNBPLmlwyLkL8Ao3iZg+N8pG0naCUsrKhMpc hgEtR4tPaMR6HCpFgHuXl4HH5PppGo7HaGzpHAkaYrhYDEX7DaAcLn/TCn30= X-Google-Smtp-Source: AGHT+IFYZyy3wMIfr0fNK5H4tGggpCjBuCkn4KATXqg+rhPMm+Y8RwQXdAYZiP3Qltsglm0R0GERFEdVGB3okV3Uvl/d9ee2JaRq Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:c0c4:0:b0:424:85b0:e1cb with SMTP id e9e14a558f8ab-42595644bb4mr90731585ab.31.1759056865991; Sun, 28 Sep 2025 03:54:25 -0700 (PDT) Date: Sun, 28 Sep 2025 03:54:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d913e1.050a0220.1696c6.0003.GAE@google.com> Subject: [syzbot] [ocfs2?] KASAN: use-after-free Read in ocfs2_dx_dir_lookup_rec From: syzbot To: jlbec@evilplan.org, joseph.qi@linux.alibaba.com, linux-kernel@vger.kernel.org, mark@fasheh.com, ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 51a24b7deaae Merge tag 'trace-tools-v6.17-rc5' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1531fd34580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bf99f2510ef92ba5 dashboard link: https://syzkaller.appspot.com/bug?extid=30b53487d00b4f7f0922 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14263f12580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14a8f142580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-51a24b7d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2d2422223a2d/vmlinux-51a24b7d.xz kernel image: https://storage.googleapis.com/syzbot-assets/3f33b7e0feca/bzImage-51a24b7d.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/8f3233dafc3f/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=16b3aae2580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+30b53487d00b4f7f0922@syzkaller.appspotmail.com On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. OCFS2: File system is now read-only. (syz.0.17,5501,0):ocfs2_find_entry_dx:1037 ERROR: status = -30 ================================================================== BUG: KASAN: use-after-free in ocfs2_dx_dir_lookup_rec+0x1eb/0x7f0 fs/ocfs2/dir.c:813 Read of size 4 at addr ffff88804cddc2c0 by task syz.0.17/5501 CPU: 0 UID: 0 PID: 5501 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 ocfs2_dx_dir_lookup_rec+0x1eb/0x7f0 fs/ocfs2/dir.c:813 ocfs2_dx_dir_lookup+0xdb/0x520 fs/ocfs2/dir.c:868 ocfs2_dx_dir_search fs/ocfs2/dir.c:928 [inline] ocfs2_find_entry_dx fs/ocfs2/dir.c:1042 [inline] ocfs2_find_entry+0x1004/0x2000 fs/ocfs2/dir.c:1079 ocfs2_check_dir_for_entry+0x14c/0x3f0 fs/ocfs2/dir.c:2048 ocfs2_mknod+0x697/0x2050 fs/ocfs2/namei.c:291 ocfs2_create+0x1a5/0x440 fs/ocfs2/namei.c:676 lookup_open fs/namei.c:3708 [inline] open_last_lookups fs/namei.c:3807 [inline] path_openat+0x14f4/0x3830 fs/namei.c:4043 do_filp_open+0x1fa/0x410 fs/namei.c:4073 do_sys_openat2+0x121/0x1c0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f01a478eec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe14ee92e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f01a49e5fa0 RCX: 00007f01a478eec9 RDX: 0000000000105042 RSI: 0000200000000080 RDI: ffffffffffffff9c RBP: 00007f01a4811f91 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001ff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f01a49e5fa0 R14: 00007f01a49e5fa0 R15: 0000000000000004 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f45e8d66 pfn:0x4cddc flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 ffffea0001337748 ffffea00013376c8 0000000000000000 raw: 00000007f45e8d66 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 5347, tgid 5347 (syz-executor), ts 83789570758, free_ts 89515838215 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 folio_alloc_mpol_noprof mm/mempolicy.c:2435 [inline] vma_alloc_folio_noprof+0xe4/0x200 mm/mempolicy.c:2470 folio_prealloc+0x30/0x180 mm/memory.c:-1 alloc_anon_folio mm/memory.c:4997 [inline] do_anonymous_page mm/memory.c:5054 [inline] do_pte_missing mm/memory.c:4232 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault+0x2ab9/0x5440 mm/memory.c:6195 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 page last free pid 5347 tgid 5347 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] free_unref_folios+0xdbd/0x1520 mm/page_alloc.c:2952 folios_put_refs+0x559/0x640 mm/swap.c:999 free_pages_and_swap_cache+0x277/0x520 mm/swap_state.c:264 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 vms_clear_ptes+0x42c/0x540 mm/vma.c:1235 vms_complete_munmap_vmas+0x206/0x8a0 mm/vma.c:1277 do_vmi_align_munmap+0x358/0x420 mm/vma.c:1536 do_vmi_munmap+0x253/0x2e0 mm/vma.c:1584 __vm_munmap+0x23b/0x3d0 mm/vma.c:3155 __do_sys_munmap mm/mmap.c:1080 [inline] __se_sys_munmap mm/mmap.c:1077 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1077 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88804cddc180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88804cddc200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88804cddc280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88804cddc300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88804cddc380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup