From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f79.google.com (mail-io1-f79.google.com [209.85.166.79]) (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 562B726E158 for ; Wed, 10 Sep 2025 17:53:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757526811; cv=none; b=Fk9YFLYMoyr71u+a/B8bjMxuqbkO/kArUwiUl8a3RPryY8rfH8DZWC8XTf7t85sqshjRTZQp8cxw3svX61WKYGenGa9EuZ+BXmfUg54sRgPHX8A+C8ipNtG1uiEG8m9jVQWS/iweRrK1B99qdZM8VXb1ho6Mrjl/BbECz0Ok/qw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757526811; c=relaxed/simple; bh=g65vmnBrf83PJDIpAFQzfZ0xLySouvkFdaGla1Iow0Y=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=cduQRJO7KxmguFdlCp0d0rbVZXn2NxHjh2BghAnVdpRib8PPaTsCRFEsmYFPwSUwVB7DwnDCbAjDj146WJJipODdZmh+mmTCG/KHtD8Ao1Y4kPsyEEQBgKRkNHKIFwMxl9PIgIuYmdBNC1ua/vaTINJWfQA//RSeEC6js9royB0= 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=209.85.166.79 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-io1-f79.google.com with SMTP id ca18e2360f4ac-886e347d26bso112814339f.0 for ; Wed, 10 Sep 2025 10:53:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757526809; x=1758131609; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=fAe78HzvKrmzUWfDTlQOX6TLHogAHGupJtXSD3zOil4=; b=ImIDIbF20AEA0hwU41+gy2IPm3NUvefp1QkgJQc/3AGz7mwDPlddfdDYu37gHII0/z v2idk0b+KUTj9vqIby9+rXQIbNNfacPdvLihXghrMT3/TB4WxSK2FgzyHAz8F7lxkelp mr184HlXsnKMn29WjWW8qHkWdYLYzJHzCcNJdKXa9+oID8peBAvTZWKOW4R2W/SnDn7Z W1RO1dUaBNn/DkTKjpom+5oYt30PaaaxORYyV3cDfEvK+jNq52feUSFC1Ul+U/tMDKcE kAzwRfJ3BOkCdOB7sDjvqtLzwvmwwuHg9pgo1bmN6+f7XuswHEmnKa6eYDNQvWCxl/W4 hbkA== X-Forwarded-Encrypted: i=1; AJvYcCU7kDHcRz9A8nCdM/oRiC//kmBm/xeQBwIGto9vhKz6zbNqWQX/JDL5YuPXaUDa0Qz09tV7bbNrgwhH0Ceo@vger.kernel.org X-Gm-Message-State: AOJu0Yyb16AtV58C8wXf0JAYhY7HYVd/QrsaH93qeuMcGkRu9rGobHdK dCTeoyLmfJEujDwA3pI3yqsOCGKek3Q2n0OkMxVpo1tFpuPKC4KLRgFoVCH7S6rcqs7Y2pYXEFi by0RaMWbuUY8+JjmILp9TTgKd7BA4nM5bUSMnQYxgAmuVmjR9Qc7Lm/FsyUk= X-Google-Smtp-Source: AGHT+IG0q7VHKO3FPxRQyRcND8f+cOEPjTXAcOqrvlE/B3jzOTdvqug6xnHm+OmQX8YjWxmBtZ19g1dKmFQ6s3v9xlcjt4QVyJK7 Precedence: bulk X-Mailing-List: linux-unionfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:ca0a:0:b0:402:b8e3:c9f7 with SMTP id e9e14a558f8ab-41beb04877fmr7394125ab.8.1757526809505; Wed, 10 Sep 2025 10:53:29 -0700 (PDT) Date: Wed, 10 Sep 2025 10:53:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68c1bb19.050a0220.3c6139.0027.GAE@google.com> Subject: [syzbot] [overlayfs?] WARNING in ovl_workdir_create (5) From: syzbot To: amir73il@gmail.com, linux-kernel@vger.kernel.org, linux-unionfs@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d1d10cea0895 Merge tag 'perf-tools-fixes-for-v6.17-2025-09.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14fba87c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=429771c55b615e85 dashboard link: https://syzkaller.appspot.com/bug?extid=078954d5ad423349aa78 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/fca0faadbf1b/disk-d1d10cea.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aa812ff26c41/vmlinux-d1d10cea.xz kernel image: https://storage.googleapis.com/syzbot-assets/0cf89313ffd8/bzImage-d1d10cea.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+078954d5ad423349aa78@syzkaller.appspotmail.com ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current) WARNING: CPU: 1 PID: 6377 at kernel/locking/rtmutex_common.h:191 debug_rt_mutex_unlock kernel/locking/rtmutex_common.h:191 [inline] WARNING: CPU: 1 PID: 6377 at kernel/locking/rtmutex_common.h:191 rt_mutex_slowunlock+0x6ce/0x8a0 kernel/locking/rtmutex.c:1419 Modules linked in: CPU: 1 UID: 0 PID: 6377 Comm: syz.2.75 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:debug_rt_mutex_unlock kernel/locking/rtmutex_common.h:191 [inline] RIP: 0010:rt_mutex_slowunlock+0x6ce/0x8a0 kernel/locking/rtmutex.c:1419 Code: 0f b6 04 20 84 c0 0f 85 c6 01 00 00 83 3d 0d fc 24 04 00 75 19 90 48 c7 c7 c0 ed 0a 8b 48 c7 c6 00 ee 0a 8b e8 c3 bf 8a f6 90 <0f> 0b 90 90 90 e9 2f fa ff ff 90 0f 0b 90 e9 53 fe ff ff be 02 00 RSP: 0018:ffffc90004dd74a0 EFLAGS: 00010046 RAX: 0f6370d1171cee00 RBX: ffff88805d37f7e0 RCX: 0000000000080000 RDX: ffffc9000eb1b000 RSI: 000000000000170a RDI: 000000000000170b RBP: ffffc90004dd7590 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed1017124863 R12: dffffc0000000000 R13: ffff88805d37f790 R14: 0000000000000a02 R15: 1ffff920009bae9c FS: 00007f7c0943d6c0(0000) GS:ffff8881269bf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe813a53530 CR3: 00000000378d0000 CR4: 00000000003526f0 Call Trace: inode_unlock include/linux/fs.h:879 [inline] ovl_workdir_create+0x4da/0x8b0 fs/overlayfs/super.c:331 ovl_make_workdir fs/overlayfs/super.c:669 [inline] ovl_get_workdir+0x32f/0x17c0 fs/overlayfs/super.c:827 ovl_fill_super+0x1365/0x35b0 fs/overlayfs/super.c:1406 vfs_get_super fs/super.c:1325 [inline] get_tree_nodev+0xbb/0x150 fs/super.c:1344 vfs_get_tree+0x92/0x2b0 fs/super.c:1815 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4324 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: 0033:0x7f7c0b1febe9 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:00007f7c0943d038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7c0b436090 RCX: 00007f7c0b1febe9 RDX: 0000200000000440 RSI: 0000200000000100 RDI: 0000000000000000 RBP: 00007f7c0b281e19 R08: 0000200000000200 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7c0b436128 R14: 00007f7c0b436090 R15: 00007fff5ec39608 --- 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