From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f79.google.com (mail-oo1-f79.google.com [209.85.161.79]) (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 6EF1D35E95A for ; Thu, 2 Apr 2026 10:40:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775126427; cv=none; b=N1BkvE1Y8TMLbsQjGd5txzmKH90rHm6MwSUVMiNB76fqgLslyrKAG20obXEVrg24PjNTkaO1kLrbq2GUE+QIpTZ2eYLkD56/HMIjMgBEBRdi24pUFXlQ7uVG52BJS7YbcuuIzjNDZCqHmXv5Dfm/eZD5/MBh1hz/meTJ5uOdjf0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775126427; c=relaxed/simple; bh=tiR985HdEQrbaoerAM1P5XF8T+CB3QSZQTCLPRT8/7s=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=cQL+StoiDnRiMVzCaYJ/OTDYhb3iN4e4aPjl+pORKDz4SEd0fY/DWGhxAs3wsZNIvGkrbOSlVc7xVvbMtHjV9fgIa/v+EYeNJuV321xiqmdAgL5Z18MnrQ1JEiE+aYpcyuAzFaGTPgNknBqEE/cVtSUJskacFuzz0zt6hc7STsg= 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=209.85.161.79 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-oo1-f79.google.com with SMTP id 006d021491bc7-67e07123bb5so1405436eaf.0 for ; Thu, 02 Apr 2026 03:40:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775126425; x=1775731225; h=content-transfer-encoding:to:from:subject:message-id:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=JzBqfEUVhlwH4mFgFBsMGv4JSiXOFzpAI2nq4E1o5vY=; b=M8rtDY1KxjiIHeZ+6VAJ0kMQK9U5YfgiIadDdgaPCsQnEaZ/bHDD/QV8aPp65IkBOv Btu0gPTffs9qpnGRVRSnmIZ2jDQvGRGlWZD1cBfdtfWORNrFTRs0qElN8NiKR/FLJCx5 NQOOTyveFPNDF5Lm+ac1JsAPEQYcyN1x0810LwzjKNouD06fFKh1UUenXndlOOr8xUZx LBkumZ23XY2sCpbsTTH5IHJY7bOnrPCdVFkyfx/l4MWhJAm4SqFg+EavjeDtoB96seHg jsHKViiydsDygCsy2FPEEyZzImyna8QfgjWI3NPFck7Q69kBi8LmtWhGEVWskJdpSUmd y15A== X-Forwarded-Encrypted: i=1; AJvYcCXfEdAFLTQRxRpZH2nDUPvDUaCDb0/45iSpX5moO45J1jHYwK6nqjEKdo8b5vApjprVaF20obCAKVu2PrM=@vger.kernel.org X-Gm-Message-State: AOJu0YxnpZ++6+O7/Ent+JoLx4Y5agVwgK4agsKoY6pg0dx95t+4imkH VUuEaZfg4fxdBRMetPV0y4PKb5THYP/1dKXpQAfFde4GH2zsxeTC6/T8gEz++1uYaWNYu/L9dYg IiM6izyhTqILWo7gpNYMZIH1Blve4LteDWt5K4PEaPSBVf+WiD+r7H6rdsSc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:997:b0:680:17e0:4435 with SMTP id 006d021491bc7-680a796f195mr1631189eaf.31.1775126425317; Thu, 02 Apr 2026 03:40:25 -0700 (PDT) Date: Thu, 02 Apr 2026 03:40:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ce4799.050a0220.2dbe29.0003.GAE@google.com> Subject: [syzbot] [ocfs2?] KASAN: use-after-free Write in ocfs2_write_end_nolock 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" Content-Transfer-Encoding: quoted-printable Hello, syzbot found the following issue on: HEAD commit: 9147566d8016 Merge tag 'sched_ext-for-7.0-rc6-fixes' of gi.= . git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=3D13ec1516580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3Dd46eab0cfd31c21= 4 dashboard link: https://syzkaller.appspot.com/bug?extid=3D62c1793956716ea8b= 28a compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-= 1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d90= 0f083ada3/non_bootable_disk-9147566d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ccabfb43ed2d/vmlinux-= 9147566d.xz kernel image: https://storage.googleapis.com/syzbot-assets/2106f2f69253/bzI= mage-9147566d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+62c1793956716ea8b28a@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D JBD2: Ignoring recovery information on journal ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode= . (syz.0.0,5322,0):ocfs2_check_set_options:1244 ERROR: Invalid heartbeat moun= t options loop0: detected capacity change from 32768 to 32767 OCFS2: ERROR (device loop0): int ocfs2_validate_inode_block(struct super_bl= ock *, struct buffer_head *): Invalid dinode #17058: signature =3D =EF=BF= =BD=EF=BF=BD=1A=EF=BF=BD On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is= unmounted. OCFS2: File system is now read-only. (syz.0.0,5322,0):ocfs2_assign_bh:2417 ERROR: status =3D -30 (syz.0.0,5322,0):ocfs2_inode_lock_full_nested:2512 ERROR: status =3D -30 (syz.0.0,5322,0):ocfs2_reflink_inodes_lock:4748 ERROR: status =3D -30 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D BUG: KASAN: use-after-free in memcpy_from_folio include/linux/highmem.h:586= [inline] BUG: KASAN: use-after-free in ocfs2_write_end_inline fs/ocfs2/aops.c:1915 [= inline] BUG: KASAN: use-after-free in ocfs2_write_end_nolock+0xbd9/0x18f0 fs/ocfs2/= aops.c:1949 Write of size 4086 at addr ffff888056da54d2 by task syz.0.0/5322 CPU: 0 UID: 0 PID: 5322 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full= )=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16= .3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 memcpy_from_folio include/linux/highmem.h:586 [inline] ocfs2_write_end_inline fs/ocfs2/aops.c:1915 [inline] ocfs2_write_end_nolock+0xbd9/0x18f0 fs/ocfs2/aops.c:1949 ocfs2_write_end+0x58/0x90 fs/ocfs2/aops.c:2059 generic_perform_write+0x620/0x8f0 mm/filemap.c:4340 ocfs2_file_write_iter+0x1663/0x1ed0 fs/ocfs2/file.c:2476 iter_file_splice_write+0x9a1/0x10f0 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x101/0x160 fs/splice.c:1159 splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x195/0x290 fs/splice.c:1228 vfs_copy_file_range+0xb02/0x1370 fs/read_write.c:1634 __do_sys_copy_file_range fs/read_write.c:1683 [inline] __se_sys_copy_file_range+0x2fb/0x480 fs/read_write.c:1650 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f08bb59c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 f= f 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f08bc45dfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000146 RAX: ffffffffffffffda RBX: 00007f08bb815fa0 RCX: 00007f08bb59c819 RDX: 0000000000000004 RSI: 00002000000001c0 RDI: 0000000000000005 RBP: 00007f08bb632c91 R08: ffffffffa003e45b R09: 0700000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f08bb816038 R14: 00007f08bb815fa0 R15: 00007ffcc83fcca8 The buggy address belongs to the physical page: page: refcount:2 mapcount:0 mapping:ffff88801cc2e6c8 index:0x854 pfn:0x56da= 5 memcg:ffff88801c6c0d40 aops:def_blk_aops ino:700000 dentry name(?):"" flags: 0x4fff38000004224(referenced|lru|workingset|private|node=3D1|zone=3D= 1|lastcpupid=3D0x7ff) raw: 04fff38000004224 ffffea000112e0c8 ffff8880304509e0 ffff88801cc2e6c8 raw: 0000000000000854 ffff888055d47488 00000002ffffffff ffff88801c6c0d40 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP= _NOFS|__GFP_MOVABLE|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 5322, tgid= 5321 (syz.0.0), ts 84485822747, free_ts 84440366295 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0xa8/0x1a0 mm/mempolicy.c:2581 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2591 filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1013 __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2011 __filemap_get_folio include/linux/pagemap.h:763 [inline] grow_dev_folio fs/buffer.c:1047 [inline] grow_buffers fs/buffer.c:1113 [inline] __getblk_slow fs/buffer.c:1131 [inline] bdev_getblk+0x1f6/0x6e0 fs/buffer.c:1458 __getblk include/linux/buffer_head.h:380 [inline] sb_getblk include/linux/buffer_head.h:386 [inline] ocfs2_read_blocks+0x57e/0x15e0 fs/ocfs2/buffer_head_io.c:236 ocfs2_read_inode_block_full fs/ocfs2/inode.c:1735 [inline] ocfs2_read_inode_block+0xec/0x1d0 fs/ocfs2/inode.c:1749 ocfs2_assign_bh fs/ocfs2/dlmglue.c:2415 [inline] ocfs2_inode_lock_full_nested+0x2ac/0x1bd0 fs/ocfs2/dlmglue.c:2510 ocfs2_reflink_inodes_lock+0x477/0xc50 fs/ocfs2/refcounttree.c:4744 ocfs2_remap_file_range+0x236/0x6f0 fs/ocfs2/file.c:2721 vfs_copy_file_range+0xd80/0x1370 fs/read_write.c:1600 __do_sys_copy_file_range fs/read_write.c:1683 [inline] __se_sys_copy_file_range+0x2fb/0x480 fs/read_write.c:1650 page last free pid 5322 tgid 5321 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] free_unref_folios+0xed5/0x16d0 mm/page_alloc.c:3040 folios_put_refs+0x789/0x8d0 mm/swap.c:1002 folio_batch_release include/linux/pagevec.h:101 [inline] mapping_try_invalidate+0x3c2/0x4c0 mm/truncate.c:579 loop_set_status+0x29b/0xe40 drivers/block/loop.c:1246 loop_set_status_old drivers/block/loop.c:1362 [inline] lo_ioctl+0xce6/0x1fb0 drivers/block/loop.c:1551 blkdev_ioctl+0x5e3/0x740 block/ioctl.c:804 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888056da5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888056da5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888056da6000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888056da6080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888056da6100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- 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 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