From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (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 3C23819D087 for ; Mon, 24 Jun 2024 15:27:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719242840; cv=none; b=dfVONcPV75HIDSLJAit+OURdobkkFTZ+wNzK2ZMEJBK+wp9jOcPZyJjD6c4KWI30sF6F62sDpU7uW9osLKGRx1t76QzGyeBpltoJO7rlIFWzTDyEFVeCDkx0L7rmvfrWRr9LY3X/sdq6fGWAccv99hBGgkC1lvCMVqVYgoV3VIE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719242840; c=relaxed/simple; bh=tzhoTUjn/DIergVJmRXfSBnxf5kvQx64qSKgWfdacmM=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=kruqBvNk0jbweznqFPOEuyBIbDLx6YfDNJ0RQT+AnIUdpxRGrxDSoCLdk9/hKeRvZkltFCE8rOXGwlHtoBJGWqgBSzpygCM3VVdf/EycBhkOxfUZP6P+DnW4QbwX3zMu501hjKv6lPW47b1FzLSPVgsPRsf9bF4ySjlF61v7+QY= 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=209.85.166.208 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-il1-f208.google.com with SMTP id e9e14a558f8ab-37492fe22cdso34907065ab.0 for ; Mon, 24 Jun 2024 08:27:19 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719242838; x=1719847638; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=uv9QZyvFNQpJEReELh0/Si6IkTCCXel7hEP3gP0lOkQ=; b=DodyTpykgju8q1doH1/z4JFESgoRfY6Pj87T1icC5FYWzeC5ASsPonN+I/i72Qdwcq 0ToGQKmjyEFu6DOPXfuKdktUUdy+7OT8jXQZuLkHY61UEYamEX8nQbYu5rKRvuDRmKVO /t/11HaDSlvZ2YJX53HR1HnMHDF8ttjAvAfVXa2l8y9ba23HWsiB/4LMPH1zp2S8frXk d5ajEgYamjTtF1oZm0SLsmdvpYq0v1JIUQnYhs9C88S0vyBDw/H8AZi52qwtIazy+h1i 87Jpz5aWvCq8KeCE0UB99F5SgGa4ruXDX3kezJ0rmdpb6qN42G/grT9CkcAH0mNIwUaI ntVQ== X-Forwarded-Encrypted: i=1; AJvYcCUs0v8wLcBfYUYp3ZzcH2RLbeecQYJlptM8hrt22QRK+ohnkVnqCzRoAFKtPBMtngLeGB1mzGL8uDyUXsWRu9fYyw0ZeClDUiCxWel+ X-Gm-Message-State: AOJu0YxVvn50/LbQppFNRURxuBbLtGtU6W3DVOclXLnDImG+kE+zw4t0 txDm0SmWCtcXja1ws7rx3KxNgq51GnlKV0fUPBFoEXiJ23Ry9mBtjU5WlEDP7AM6T8BvMojImwB uZgV4FDvthPLiLf72og+ixNTVG/vBs/316ih5vDlUNF5IY6ISngO7XDI= X-Google-Smtp-Source: AGHT+IHEFj6JqrLDueAmnhIgvoBTRDCAK+g+ykmP/vctpJEyM0cQhmmCV5CRQCnajRFiwgRwjrYIAxdj3wGOMJKH4MaybYmYQQx1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:c54a:0:b0:375:cfd0:393d with SMTP id e9e14a558f8ab-3763a2510c6mr5302435ab.2.1719242838497; Mon, 24 Jun 2024 08:27:18 -0700 (PDT) Date: Mon, 24 Jun 2024 08:27:18 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000abf2f0061ba46a1a@google.com> Subject: [syzbot] [lvs?] possible deadlock in start_sync_thread From: syzbot To: coreteam@netfilter.org, davem@davemloft.net, edumazet@google.com, horms@verge.net.au, ja@ssi.bg, kadlec@netfilter.org, kuba@kernel.org, linux-kernel@vger.kernel.org, lvs-devel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pabeni@redhat.com, pablo@netfilter.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3226607302ca selftests: net: change shebang to bash in amt.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=12a2683e980000 kernel config: https://syzkaller.appspot.com/x/.config?x=e78fc116033e0ab7 dashboard link: https://syzkaller.appspot.com/bug?extid=e929093395ec65f969c7 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/125c85863435/disk-32266073.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4477ecab2e1f/vmlinux-32266073.xz kernel image: https://storage.googleapis.com/syzbot-assets/43e28f6ce879/bzImage-32266073.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e929093395ec65f969c7@syzkaller.appspotmail.com ====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc4-syzkaller-00837-g3226607302ca #0 Not tainted ------------------------------------------------------ syz-executor.4/10811 is trying to acquire lock: ffffffff8f5e6f48 (rtnl_mutex){+.+.}-{3:3}, at: start_sync_thread+0xdc/0x2dc0 net/netfilter/ipvs/ip_vs_sync.c:1761 but task is already holding lock: ffff88805ba95750 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_setsockopt+0x1c3/0xe50 net/smc/af_smc.c:3064 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&smc->clcsock_release_lock){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 smc_switch_to_fallback+0x35/0xd00 net/smc/af_smc.c:902 smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2779 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2192 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2200 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (sk_lock-AF_INET){+.+.}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 lock_sock_nested+0x48/0x100 net/core/sock.c:3543 do_ip_setsockopt+0x1a2d/0x3cd0 net/ipv4/ip_sockglue.c:1078 ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417 do_sock_setsockopt+0x3af/0x720 net/socket.c:2312 __sys_setsockopt+0x1ae/0x250 net/socket.c:2335 __do_sys_setsockopt net/socket.c:2344 [inline] __se_sys_setsockopt net/socket.c:2341 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2341 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (rtnl_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 start_sync_thread+0xdc/0x2dc0 net/netfilter/ipvs/ip_vs_sync.c:1761 do_ip_vs_set_ctl+0x442/0x13d0 net/netfilter/ipvs/ip_vs_ctl.c:2732 nf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101 smc_setsockopt+0x275/0xe50 net/smc/af_smc.c:3072 do_sock_setsockopt+0x3af/0x720 net/socket.c:2312 __sys_setsockopt+0x1ae/0x250 net/socket.c:2335 __do_sys_setsockopt net/socket.c:2344 [inline] __se_sys_setsockopt net/socket.c:2341 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2341 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: rtnl_mutex --> sk_lock-AF_INET --> &smc->clcsock_release_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&smc->clcsock_release_lock); lock(sk_lock-AF_INET); lock(&smc->clcsock_release_lock); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor.4/10811: #0: ffff88805ba95750 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_setsockopt+0x1c3/0xe50 net/smc/af_smc.c:3064 stack backtrace: CPU: 0 PID: 10811 Comm: syz-executor.4 Not tainted 6.10.0-rc4-syzkaller-00837-g3226607302ca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 start_sync_thread+0xdc/0x2dc0 net/netfilter/ipvs/ip_vs_sync.c:1761 do_ip_vs_set_ctl+0x442/0x13d0 net/netfilter/ipvs/ip_vs_ctl.c:2732 nf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101 smc_setsockopt+0x275/0xe50 net/smc/af_smc.c:3072 do_sock_setsockopt+0x3af/0x720 net/socket.c:2312 __sys_setsockopt+0x1ae/0x250 net/socket.c:2335 __do_sys_setsockopt net/socket.c:2344 [inline] __se_sys_setsockopt net/socket.c:2341 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2341 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f42d8a7d0a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f42d98870c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f42d8bb3f80 RCX: 00007f42d8a7d0a9 RDX: 000000000000048b RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f42d8aec074 R08: 0000000000000018 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f42d8bb3f80 R15: 00007ffde628d3a8 --- 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