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AJvYcCWsXyVtIP9KFfhKLGeAEwhMOzrXZc71RYgeI551WkYu6kMxH2OPbT0t10SgajYqBWLhSDRfe/DMs5dDjRc=@vger.kernel.org X-Gm-Message-State: AOJu0YzeL06kC2tCSrd/nsMqNX48EVo2UIWAdVPtbmHxPW9ubcLiVlaH 2iXMM4Veo1B/JQY2FIvcITLxxnZW+klC42faLKTwuBefmbamVl/yVjxNTyxUutR05p085Fx3Xz7 w3JcaHtzcjP9b2r0phKq9QxThbHiQfKyZbps9zw9FbK//04aJ30s8HdmHcfw= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:860f:b0:67e:1c07:168a with SMTP id 006d021491bc7-67e1c07176amr3121166eaf.34.1774847130503; Sun, 29 Mar 2026 22:05:30 -0700 (PDT) Date: Sun, 29 Mar 2026 22:05:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ca049a.a70a0220.97f31.0127.GAE@google.com> Subject: [syzbot] [bfs?] WARNING in bfs_get_block From: syzbot To: aivazian.tigran@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3b058d1aeeef Add linux-next specific files for 20260327 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15c1ec73980000 kernel config: https://syzkaller.appspot.com/x/.config?x=4acce231a75c746f dashboard link: https://syzkaller.appspot.com/bug?extid=d083fd809394eab229a8 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10dd4c73980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16bdff52580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5a5b73363d45/disk-3b058d1a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ecba5c3ac106/vmlinux-3b058d1a.xz kernel image: https://storage.googleapis.com/syzbot-assets/348124eb71de/bzImage-3b058d1a.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/5960870b4867/mount_7.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d083fd809394eab229a8@syzkaller.appspotmail.com ------------[ cut here ]------------ !buffer_uptodate(bh) WARNING: fs/buffer.c:1180 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1180, CPU#1: syz.0.31/6148 Modules linked in: CPU: 1 UID: 0 PID: 6148 Comm: syz.0.31 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:mark_buffer_dirty+0x299/0x410 fs/buffer.c:1180 Code: 4c 89 f7 e8 c9 67 da ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 54 5e fb ff e8 ff fd 70 ff eb 8c e8 f8 fd 70 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 ea fd 70 ff 90 0f 0b 90 e9 cf fd ff ff RSP: 0018:ffffc90003957608 EFLAGS: 00010293 RAX: ffffffff82552488 RBX: ffff888071a17828 RCX: ffff88802d50bd00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 RBP: ffff8880329b8001 R08: ffff888071a1782f R09: 1ffff1100e342f05 R10: dffffc0000000000 R11: ffffed100e342f06 R12: ffff888069c75000 R13: ffff888071910d98 R14: ffff888071a17828 R15: 000000000000000f FS: 00007fb4059fe6c0(0000) GS:ffff88812553f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001000 CR3: 0000000072546000 CR4: 00000000003526f0 Call Trace: bfs_move_block fs/bfs/file.c:44 [inline] bfs_move_blocks fs/bfs/file.c:57 [inline] bfs_get_block+0x5da/0xae0 fs/bfs/file.c:126 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2142 block_write_begin+0x8d/0x120 fs/buffer.c:2253 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:180 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4468 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61d/0xb90 fs/read_write.c:688 ksys_pwrite64 fs/read_write.c:795 [inline] __do_sys_pwrite64 fs/read_write.c:803 [inline] __se_sys_pwrite64 fs/read_write.c:800 [inline] __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:800 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb40639c799 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:00007fb4059fe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fb406616090 RCX: 00007fb40639c799 RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000008 RBP: 00007fb406432c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb406616128 R14: 00007fb406616090 R15: 00007ffd7ddb9028 --- 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