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AFNElJ/JT+8PJ87DDEdOwDzFSCth58H0Z7cIMXT7zAObOag4Noup727YmM7b+oFcDkv1Jdl4cs79YCj3VInFE74=@vger.kernel.org X-Gm-Message-State: AOJu0YzgJk4rwIkYeY4aWnSNqP24CAOFT0AhtPaWJyfaHcIvyLT5kQgY T9Tr/9w2FBGCqoDjtQ9di87Kad/B+yRt9OY/3/tty3I6O4SdKazL1upjhhPlEBMvpFa/2Ez4JjX 3blQEBvBUzh6lZXWXiOx/BZi7aoqFGHsRtqrFcE/b9BsWPyTwRaFYIampibI= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:189b:b0:6a3:ba7:842d with SMTP id 006d021491bc7-6a36d861660mr3064491eaf.11.1783550665114; Wed, 08 Jul 2026 15:44:25 -0700 (PDT) Date: Wed, 08 Jul 2026 15:44:25 -0700 In-Reply-To: <6a05437d.170a0220.196691.0003.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a4ed2c9.57639fcc.86d58.0017.GAE@google.com> Subject: Re: [syzbot] [hfs?] WARNING in hfs_mdb_commit From: syzbot To: frank.li@vivo.com, glaubitz@physik.fu-berlin.de, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, slava@dubeyko.com, syzkaller-bugs@googlegroups.com, vdubeyko@redhat.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 0e35b9b6ec0f Merge tag 'mm-hotfixes-stable-2026-07-06-17-4.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=137e7d89580000 kernel config: https://syzkaller.appspot.com/x/.config?x=20c9876b0f77b546 dashboard link: https://syzkaller.appspot.com/bug?extid=c149ad75e9633be0c1ad compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11c55d46580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=158f6739580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-0e35b9b6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2a17ca6db8f5/vmlinux-0e35b9b6.xz kernel image: https://storage.googleapis.com/syzbot-assets/c885024dccba/bzImage-0e35b9b6.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/6a4d05118745/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c149ad75e9633be0c1ad@syzkaller.appspotmail.com ------------[ cut here ]------------ !buffer_uptodate(bh) WARNING: fs/buffer.c:1093 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093, CPU#0: syz.1.1033/6784 Modules linked in: CPU: 0 UID: 0 PID: 6784 Comm: syz.1.1033 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093 Code: 4c 89 f7 e8 f9 0d d9 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 d4 5e fb ff e8 af e7 69 ff eb 8c e8 a8 e7 69 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 9a e7 69 ff 90 0f 0b 90 e9 cf fd ff ff RSP: 0018:ffffc90005d379a8 EFLAGS: 00010293 RAX: ffffffff825c9ae8 RBX: ffff8880123aa700 RCX: ffff888034a30000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 RBP: 1ffff1100a45f401 R08: ffff8880123aa707 R09: 1ffff110024754e0 R10: dffffc0000000000 R11: ffffed10024754e1 R12: dffffc0000000000 R13: ffff8880522fa668 R14: ffff888045ba945b R15: ffff888045ba9400 FS: 000055556b366500(0000) GS:ffff88808c54e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31a63fff CR3: 0000000034b1d000 CR4: 0000000000352ef0 Call Trace: hfs_mdb_commit+0x503/0x1160 fs/hfs/mdb.c:309 hfs_sync_fs+0x1d/0x30 fs/hfs/super.c:38 sync_filesystem+0x1cf/0x230 fs/sync.c:66 fs_bdev_sync+0x2c/0x50 fs/super.c:1433 blkdev_flushbuf block/ioctl.c:520 [inline] blkdev_common_ioctl+0x12e1/0x3250 block/ioctl.c:658 blkdev_ioctl+0x528/0x740 block/ioctl.c:791 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+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1d9239de59 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 ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffd0ece148 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1d92625fa0 RCX: 00007f1d9239de59 RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000004 RBP: 00007f1d92433e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1d92625fac R14: 00007f1d92625fa0 R15: 00007f1d92625fa0 --- 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.