From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f78.google.com (mail-oo1-f78.google.com [209.85.161.78]) (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 DEF4B235063 for ; Mon, 26 Jan 2026 14:07:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769436454; cv=none; b=KTOjQpyrr0X4RRYvaK7Cl2JwwMxznLkyx4lUrJrmC5j23diJ7tREges9lMQLmpgN/A54dfx5K6BP78JTrZeRx/U3B3hvNKONYlFQGv94YH6zgFR47Lxocju9jCh1s1rzW3HWyQQQ9ZVYvt3pGA4r8gzbLb/E7ZjxmNbtcxD4I+A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769436454; c=relaxed/simple; bh=PUJPhOJ4AZ2lB4sT5ZrEb+XeEdqEQ9/Hnw47hjixBKQ=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=f4tBpDZqk8UlGNycQCR1LtGxtS5/EtrvlahaTiO6Ar5AM+A+gQs1h0njaorrR0RhKaFe0HUbflkXgoF8x+HHuycwwUVNH0LFvz3p100X7cCsEzd4IDJELh1ybr1XeVOB/T5KDE8VR1MNMYQNsi89AeKq+A5eMw+RHm8TadsLlQg= 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=209.85.161.78 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-f78.google.com with SMTP id 006d021491bc7-6610e4c7e46so8659263eaf.0 for ; Mon, 26 Jan 2026 06:07:32 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769436452; x=1770041252; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=6YOXJTvQa35EfB+oi4pMAGZpTsTQpaRB63oI/VpRPtY=; b=KJw+T0+C4ZdSNdOnweGVsUUaVszxZONvAVqXzGOHJGUaSIAgqqMdYE3cthgZGu4L2L T3Zgjv3pIfyG+r/e6JbRTNO8VWRPFMFASwm8Uzi/Uag2oFHnytSSk8700Pi0+XcdctFU /vNKWXjTMoZ8oi4giTYrafEthS5dljpr0B8CWlgLQ/9iSVVq/UnRTQ9YtwSIfwDwtkCi g4cYvrBWcvpcYoqnu1Zc90+r8KMI8IPQSrMmVJwP2up0citf06bspVLgh9DxRQPqOlTt 9wVlMUhOWc1LoC6ttBiehx13hUKXOkdDi3EXljkZpOnyIeydmoqHV9phLlKizes3OYZs oGLw== X-Forwarded-Encrypted: i=1; AJvYcCUSZhHUop4dOY8tnWgVFNU3qKojJ4ULxQ/xuyZJMvlDv2bBg1d7r5UQa/EYEv2YgThBPhvPG04J+hYk6uo=@vger.kernel.org X-Gm-Message-State: AOJu0Yyx3TQ3xmMzljRlKvKeDc2tyNWD6EY/puOSctl53dWlTrKalcOr qM9n0j9EUg+BFB+ULOkuVfjNS6kRHeS9oClzA2stf74Xf+xw4/yJKsZJIYWoMrYhtPqP3OxqHie aLk7YgQ78hf5j99DMxYv/vcz8aIf05jybKGlLCWlSUofLEh38WpC/ybMeV60= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1886:b0:65b:2a82:d700 with SMTP id 006d021491bc7-662e044e138mr2042204eaf.44.1769436451887; Mon, 26 Jan 2026 06:07:31 -0800 (PST) Date: Mon, 26 Jan 2026 06:07:31 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69777523.050a0220.1d05e9.0018.GAE@google.com> Subject: [syzbot] [iomap?] WARNING in iomap_iter (6) From: syzbot To: brauner@kernel.org, djwong@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a66191c590b3 Merge tag 'hyperv-fixes-signed-20260121' of g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10db3e3a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=312c0a6c03e6d7df dashboard link: https://syzkaller.appspot.com/bug?extid=bd5ca596a01d01bfa083 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f802af648f7a/disk-a66191c5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9f28f489fe55/vmlinux-a66191c5.xz kernel image: https://storage.googleapis.com/syzbot-assets/8c44005e0c3c/bzImage-a66191c5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bd5ca596a01d01bfa083@syzkaller.appspotmail.com ------------[ cut here ]------------ iter->iomap.offset + iter->iomap.length <= iter->pos WARNING: fs/iomap/iter.c:36 at iomap_iter_done fs/iomap/iter.c:36 [inline], CPU#0: kworker/u8:26/9724 WARNING: fs/iomap/iter.c:36 at iomap_iter+0x982/0xf30 fs/iomap/iter.c:114, CPU#0: kworker/u8:26/9724 Modules linked in: CPU: 0 UID: 0 PID: 9724 Comm: kworker/u8:26 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 Workqueue: loop6 loop_workfn RIP: 0010:iomap_iter_done fs/iomap/iter.c:36 [inline] RIP: 0010:iomap_iter+0x982/0xf30 fs/iomap/iter.c:114 Code: ff ff ff e9 86 fa ff ff e8 ab 6d 65 ff 90 0f 0b 90 e9 06 fd ff ff e8 9d 6d 65 ff 90 0f 0b 90 e9 3b fd ff ff e8 8f 6d 65 ff 90 <0f> 0b 90 e9 97 fd ff ff e8 81 6d 65 ff 90 0f 0b 90 e9 c4 fd ff ff RSP: 0018:ffffc9000cdcf268 EFLAGS: 00010293 RAX: ffffffff825d2b81 RBX: ffffc9000cdcf3c0 RCX: ffff88806e5d1e80 RDX: 0000000000000000 RSI: 8000000000083fff RDI: 0000003e80000000 RBP: ffffc9000cdcf3f8 R08: ffffc9000cdcf3e8 R09: ffffc9000cdcf430 R10: dffffc0000000000 R11: ffffffff8473db20 R12: 8000000000083fff R13: ffffc9000cdcf402 R14: 1ffff920019b9e79 R15: 0000003e80000000 FS: 0000000000000000(0000) GS:ffff888125928000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000031712ff8 CR3: 0000000043618000 CR4: 00000000003526f0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: iomap_file_buffered_write+0x275/0xa30 fs/iomap/buffered-io.c:1187 blkdev_buffered_write block/fops.c:736 [inline] blkdev_write_iter+0x524/0x710 block/fops.c:802 lo_rw_aio+0xc7a/0xf00 include/linux/percpu-rwsem.h:-1 do_req_filebacked drivers/block/loop.c:434 [inline] loop_handle_cmd drivers/block/loop.c:1947 [inline] loop_process_work+0x61d/0x11a0 drivers/block/loop.c:1982 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0x89f/0xd90 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 --- 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