From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 331031BDCD; Mon, 17 Jun 2024 10:15:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718619328; cv=none; b=jbIiJKQ35RklrXjbjX4aAW6B5J5K66cAtCBuEtVvVuAo/Me6evX0RPajSLwEY5MwZoQt5jl0iLOts68WXS+h5dWcixbchWRXaKZsvtHYg4O6k+uBs2VjiNRuxHq+Pm7k62EpMBdeHCruGvc3YF5h/A938V5zXskncDoWkQu6/kM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718619328; c=relaxed/simple; bh=/Ylp/XPo5N3EZ0PL8HetEurvBIYrwuQiVh62fDD/ehs=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=RtnO1qtLQZD6awynq/5oZiCiWX9ZlLeX10MDN0gIEQQ1gK2gChJv+SB29ukJ/R8Eih/npUSQyKyNquJYQRDp5px6xY/GzFn2GwnZ9FoyX6RH6aAj7uixPY1ej2hAojefDIhhWruzFkLq1+PotvmbNMMTns5yGIImWHu06H7O2OQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TgZjQTfR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TgZjQTfR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83526C2BD10; Mon, 17 Jun 2024 10:15:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1718619327; bh=/Ylp/XPo5N3EZ0PL8HetEurvBIYrwuQiVh62fDD/ehs=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=TgZjQTfRpviAuR//fhz9TvFMmN1P/c/TCZYsjp5iqJOOnSQW41y383EzOfA1szSEX BgraNg6JExtCVIQTUK0qejDumUkv8ZEPFRTgPTFj/RWExDIa+6hTyE45ldR0H3iczy 258tQLyQAcTpiAGw7LzBU9olMriVcjZs71rCtMRz1oDUAZEBU5g37AgEbynHh/idvS 8Us2O4+ruNW8GMoVoignLASxPh1Iz4h75incQDbxPOQoo8p+t046rzbBbMrsecKQfu 5I6BAOqgHmyMFAnLZ1WzGr2B/h0Mo0i9JT88rxxqKwDiSlvqMnNW1QZqG7zYOyb6l3 4AAYcq/hKK0/w== Message-ID: <1e36e3c4e4ee1243716f0da5f451ea15993a7e82.camel@kernel.org> Subject: Re: [syzbot] [nfs?] INFO: task hung in nfsd_nl_listener_get_doit From: Jeff Layton To: syzbot , Dai.Ngo@oracle.com, chuck.lever@oracle.com, kolga@netapp.com, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, neilb@suse.de, syzkaller-bugs@googlegroups.com, tom@talpey.com Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Lorenzo Bianconi Date: Mon, 17 Jun 2024 06:15:25 -0400 In-Reply-To: <000000000000322bec061aeb58a3@google.com> References: <000000000000322bec061aeb58a3@google.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf CBYyUE8QJpvTZyfUHNYldXlrjO6n5MdOempLqWpfOmcGkwnyNRBR46g/jf8KnPRwXs509yAqDB6sE 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AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.2 (3.52.2-1.fc40app2) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sat, 2024-06-15 at 03:39 -0700, syzbot wrote: > Hello, >=20 > syzbot found the following issue on: >=20 > HEAD commit: cea2a26553ac mailmap: Add my outdated addresses to the ma= p.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D169fd8ee98000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3Dfa0ce06dcc735= 711 > dashboard link: https://syzkaller.appspot.com/bug?extid=3D4207adf14e7c098= 1d28d > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Deb= ian) 2.40 >=20 > Unfortunately, I don't have any reproducer for this issue yet. >=20 > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/1f7ce933512f/dis= k-cea2a265.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/0ce3b9940616/vmlinu= x-cea2a265.xz > kernel image: https://storage.googleapis.com/syzbot-assets/19e24094ea37/b= zImage-cea2a265.xz >=20 > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+4207adf14e7c0981d28d@syzkaller.appspotmail.com >=20 > INFO: task syz-executor.1:17770 blocked for more than 143 seconds. > Not tainted 6.10.0-rc3-syzkaller-00022-gcea2a26553ac #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor.1 state:D stack:23800 pid:17770 tgid:17767 ppid:11381 = flags:0x00000006 > Call Trace: > > context_switch kernel/sched/core.c:5408 [inline] > __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745 > __schedule_loop kernel/sched/core.c:6822 [inline] > schedule+0x14b/0x320 kernel/sched/core.c:6837 > schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894 > __mutex_lock_common kernel/locking/mutex.c:684 [inline] > __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 > nfsd_nl_listener_get_doit+0x115/0x5d0 fs/nfsd/nfsctl.c:2124 > genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] > genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] > genl_rcv_msg+0xb16/0xec0 net/netlink/genetlink.c:1210 > netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2564 > genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 > netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] > netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1361 > netlink_sendmsg+0x8db/0xcb0 net/netlink/af_netlink.c:1905 > sock_sendmsg_nosec net/socket.c:730 [inline] > __sock_sendmsg+0x223/0x270 net/socket.c:745 > ____sys_sendmsg+0x525/0x7d0 net/socket.c:2585 > ___sys_sendmsg net/socket.c:2639 [inline] > __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2668 > 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: 0033:0x7f24ed27cea9 > RSP: 002b:00007f24ee0080c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00007f24ed3b3f80 RCX: 00007f24ed27cea9 > RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000005 > RBP: 00007f24ed2ebff4 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >=20 >=20 > --- > 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. >=20 > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >=20 > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title >=20 > 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) >=20 > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report >=20 > If you want to undo deduplication, reply with: > #syz undup We've had number of these reports recently. I think I understand what's happening but I'm not sure how to fix it. The problem manifests as a stuck nfsd_mutex: nfsd_nl_rpc_status_get_start takes the nfsd_mutex, and it's released in nfsd_nl_rpc_status_get_done. These are the ->start and ->done operations for the rpc_status_get dumpit routine. I think syzbot is triggering one of the two "goto errout_skb" conditions in netlink_dump (not sure which). In those cases we end up returning from that function without calling ->done, which would lead to the hung mutex like we see here. Is this a bug in the netlink code, or is the rpc_status_get dumpit routine not using ->start and ->done correctly? Thanks, --=20 Jeff Layton