From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from r3-18.sinamail.sina.com.cn (r3-18.sinamail.sina.com.cn [202.108.3.18]) (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 4086927C17F for ; Mon, 18 Aug 2025 22:27:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.108.3.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755556063; cv=none; b=kvCfG7YdAxSf5yWnPeliNbm0TgESXxCESp6sBTjOCJzr1JDhZHZ3acwlgbBU59ojl1vzv9S+TYjUymVlYUqATXrrc3XCdDnus8pbHX/XVRRDGCdRPgkyeIm2WQyrIBXIDacoXUdoMyxB8PUvtUvMhfIiinWbTaJRYeXVA47lTow= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755556063; c=relaxed/simple; bh=bCPONr1Qtyz3N9oBKepPASZ0r46Hj8tztRncVRsnHLo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oF/05frzwXumLFyoVSZjWaG+lMYbTPC9XNmQCf/GXdkzKEq03hRSVn3S8kFyxRaso4VAk70n5w8TQLQXVKUcKbKZQaWk3T/tupselvYd5yLCbij/WtdN+ode8s0CofrsDHYc7uMpIjhil3uY2LLOSJsGV8VgvJ+druZf4gqisSo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=W/Iy0Kot; arc=none smtp.client-ip=202.108.3.18 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="W/Iy0Kot" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1755556060; bh=7EghuakxsNW7L1YjQWnc7VCdy2bkOsiSmmq/lmW3TeQ=; h=From:Subject:Date:Message-ID; b=W/Iy0KotJzIlSZkh5yJObmdJjGX8E7b0DUVgx7x3pvJVivxD1ZgtFxMezsozbdRXb iQnS0g1wxTy9KBKvz/9XuEsx34NuOT5XQXOWl2A9g0+4KfFw5fXo+jU8LXw2CNolZJ XqZy70NIAnAvSVUGAUUuHAmI25N3n9qbzUDIB7Bg= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.58.236]) by sina.com (10.54.253.32) with ESMTP id 68A3A8D000003CC2; Mon, 19 Aug 2025 06:27:30 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 2472084456675 X-SMAIL-UIID: 3C82A0469A79420784FCC32ED3925293-20250819-062730-1 From: Hillf Danton To: syzbot Cc: Al Viro , edumazet@google.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in sys_umount (3) Date: Tue, 19 Aug 2025 06:27:17 +0800 Message-ID: <20250818222718.5061-1-hdanton@sina.com> In-Reply-To: <20250818182616.GB222315@ZenIV> References: <67555b72.050a0220.2477f.0026.GAE@google.com> <68a2f584.050a0220.e29e5.009d.GAE@google.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Mon, 18 Aug 2025 19:26:16 +0100 Al Viro wrote: > On Mon, Aug 18, 2025 at 02:42:28AM -0700, syzbot wrote: > > syzbot has found a reproducer for the following issue on: > > > > HEAD commit: 8f5ae30d69d7 Linux 6.17-rc1 > > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > > console output: https://syzkaller.appspot.com/x/log.txt?x=1321eba2580000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb > > dashboard link: https://syzkaller.appspot.com/bug?extid=1ec0f904ba50d06110b1 > > compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > > userspace arch: arm64 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10cba442580000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10a1eba2580000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz > > mounted in repro: https://storage.googleapis.com/syzbot-assets/43186d9e448c/mount_0.gz > > fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=174ba442580000) > > > > The issue was bisected to: > > > > commit d15121be7485655129101f3960ae6add40204463 > > Author: Paolo Abeni > > Date: Mon May 8 06:17:44 2023 +0000 > > > > Revert "softirq: Let ksoftirqd do its job" > > Would be interesting to see how it behaves on #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git fixes