From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx49qxZoPyi7vN7cDdfYdeh17HLK/wNMbvfbjeEmVwM89FTFnL1Xy5pPbSUD4u8PEfS5KFEy0 ARC-Seal: i=1; a=rsa-sha256; t=1523098810; cv=none; d=google.com; s=arc-20160816; b=FSntezikqtlNKEYR6n5hhs/epO7M0/mx2QziSFZuN+C3zH4xSZUrb43AF1e1qLvq/X C03Vgtj1sPfQr2fwFqm9noDDdcBXE2oxwCVrfEqX8HeMLilL0XOcNMA2CKk5JPieTojH JWCRVNkBD+jQZNaTSBRvAMYsrDPc/I4SzTBL3jUo/4yCJ5clIXfxbA/pMDVHos+iDSHY aCcwumjdrfq09OUf48kjzg3IYZVl8+os2k3z0kqCM9EJdd9Z8xNyJBTApzwjcg8uPERN AtHu+rObhQnCoKwdE8DTvDdNWlNVpqLWDZf7S/zS7hamsFxPBPAc+4ygYS4RKTcmwIu6 0a7Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:subject:cc:to:from :message-id:date:arc-authentication-results; bh=jmtZz+5fLCWsNuE9uItbbp1i4E8Rr0lJhPb3zYbvgbY=; b=HFlMaljlXnlg2dFbAB97AsfKSlAW9v5ImxBl3NbJKFTI+tSYPNMdOdrOdzMOe6ObzL 0j73oNeRF1hCmPOLJvWxZRx9J5ao0+k+RSlPXjxZ4jEekTzS3nraPN15mrLRWL2id6bc nVEkBgS3uMO6LX/9Swf0LiviK0Lcyeo7AaVhj3cD/9JAiFC9PoydlEWKj2HoZ3QRkFkL 05/quegeuOVLey6DiRKZJLnQ56zPx+8pKlgpyV/r3fdXv0iZNORCds0UVaay5PHmsdhe h7y+5TOWmAUGEjh9VfkyqqdKYBgB+DykzWYnxh8ZexMOJBTVuhui0r7OH4xNOUGPAXpR hyJA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of tiwai@suse.de designates 195.135.220.15 as permitted sender) smtp.mailfrom=tiwai@suse.de Authentication-Results: mx.google.com; spf=pass (google.com: domain of tiwai@suse.de designates 195.135.220.15 as permitted sender) smtp.mailfrom=tiwai@suse.de Date: Sat, 07 Apr 2018 13:00:06 +0200 Message-ID: From: Takashi Iwai To: Dmitry Vyukov Cc: syzbot , alsa-devel@alsa-project.org, Victor Chibotaru , syzkaller-bugs@googlegroups.com, Thomas Gleixner , Andrew Morton , Greg Kroah-Hartman , Jaroslav Kysela , Takashi Sakamoto , LKML , Andrey Ryabinin Subject: Re: INFO: rcu detected stall in snd_pcm_oss_write3 (2) In-Reply-To: References: <000000000000118a9a056928bbd9@google.com> <00000000000004c1de05693489a8@google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/25.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1596979719194785856?= X-GMAIL-MSGID: =?utf-8?q?1597084857818939129?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Sat, 07 Apr 2018 12:19:33 +0200, Dmitry Vyukov wrote: > > On Sat, Apr 7, 2018 at 11:56 AM, Takashi Iwai wrote: > > On Fri, 06 Apr 2018 23:14:01 +0200, > > syzbot wrote: > >> > >> syzbot has found reproducer for the following crash on upstream commit > >> 38c23685b273cfb4ccf31a199feccce3bdcb5d83 (Fri Apr 6 04:29:35 2018 +0000) > >> Merge tag 'armsoc-drivers' of > >> git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc > >> syzbot dashboard link: > >> https://syzkaller.appspot.com/bug?extid=150189c103427d31a053 > >> > >> So far this crash happened 15 times on upstream. > >> C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5405588854931456 > >> syzkaller reproducer: > >> https://syzkaller.appspot.com/x/repro.syz?id=5561439796330496 > >> Raw console output: > >> https://syzkaller.appspot.com/x/log.txt?id=5697900571000832 > >> Kernel config: > >> https://syzkaller.appspot.com/x/.config?id=-5813481738265533882 > >> compiler: gcc (GCC) 8.0.1 20180301 (experimental) > > > > Thanks to the reproducer, I could spot out now. > > Below is the patch (which was submitted as well). > > Great! > > There are 3 more recent stalls in sound, does this fix them as well? > > https://groups.google.com/forum/#!msg/syzkaller-bugs/MGfk8WH3O6k/ja2xKpdcCAAJ > https://groups.google.com/forum/#!msg/syzkaller-bugs/74HglwU94go/T89ohzlYCAAJ > https://groups.google.com/forum/#!msg/syzkaller-bugs/D2xWV7WTRDk/5y2kZyBICAAJ Yes, very likely. Takashi