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Howlett" To: syzbot Cc: akpm@linux-foundation.org, davem@davemloft.net, jannh@google.com, jhs@mojatatu.com, jiri@resnulli.us, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, vinicius.gomes@intel.com, xiyou.wangcong@gmail.com Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in mas_preallocate (2) Message-ID: Mail-Followup-To: "Liam R. 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 VM94MOQv 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pONTyuszreEvoCgrXCt78LOdjaTab1O+zp1ckIqkE0l1svcfyqpBB5Oa7yaDhBtii/AqT0gitryEIt16LFoqnh7wuzod7aIOY6mRwlCOiTk= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: * syzbot [250102 19:47]: > syzbot has bisected this issue to: > > commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 > Author: Vinicius Costa Gomes > Date: Sat Sep 29 00:59:43 2018 +0000 > > tc: Add support for configuring the taprio scheduler > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=117df818580000 > start commit: feffde684ac2 Merge tag 'for-6.13-rc1-tag' of git://git.ker.. > git tree: upstream > final oops: https://syzkaller.appspot.com/x/report.txt?x=137df818580000 > console output: https://syzkaller.appspot.com/x/log.txt?x=157df818580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=50c7a61469ce77e7 > dashboard link: https://syzkaller.appspot.com/bug?extid=882589c97d51a9de68eb > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10e8a8df980000 > > Reported-by: syzbot+882589c97d51a9de68eb@syzkaller.appspotmail.com > Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > This looks wrong, if this is a bug (which looks like it is since it has a syzbot reproducer?), then it's different than the previous two reports and probably not related. Vinicius, Looking at the patch, it seems you missed some users of -1 vs TAPRIO_ALL_GATES_OPEN in taprio_peek(). The comment in taprio_dequeue() is useful - maybe the gate_mask rcu lock/unlock could be a function and have that comment live in a static inline function? Thanks, Liam