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([109.69.61.57]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1c32eb8036sm376967366b.45.2026.07.24.13.28.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Jul 2026 13:28:33 -0700 (PDT) From: Nikolay Ivchenko To: hdanton@sina.com Cc: davem@davemloft.net, edumazet@google.com, horms@kernel.org, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzbot+2ad5ec205a38c46522b3@syzkaller.appspotmail.com, syzkaller-bugs@googlegroups.com, vinicius.gomes@intel.com Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in unmap_region Date: Fri, 24 Jul 2026 23:27:53 +0300 Message-ID: <20260724202753.248227-1-nivchenko.dev@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260722125604.664-1-hdanton@sina.com> References: <20260722125604.664-1-hdanton@sina.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > A known issue, feel free to grep broken in the 2025 report [1]. > > [1] Subject: Re: [syzbot] [net?] [mm?] INFO: rcu detected stall in inet_rtm_newaddr (2) > https://lore.kernel.org/lkml/CANn89iLjjtXV3ZMxfQDb1bbsVJ6a_Chexu4FwqeejxGTwsR_kg@mail.gmail.com/ Thanks for the link, Hillf. I read through that thread and also looked at several other open syzbot reports with "stall" in the subject line that have replies from other developers: - https://syzkaller.appspot.com/bug?extid=385468161961cee80c31 - https://syzkaller.appspot.com/bug?extid=111bc509cd9740d7e4aa - https://syzkaller.appspot.com/bug?extid=c28b5fee66fd3b7f766e - https://syzkaller.appspot.com/bug?extid=9f78d5c664a8c33f4cce - https://syzkaller.appspot.com/bug?extid=69904c3b4a09e8fa2e1b - https://syzkaller.appspot.com/bug?extid=51cd74c5dfeafd65e488 - https://syzkaller.appspot.com/bug?extid=5b4f4f81240931b16844 - https://syzkaller.appspot.com/bug?extid=4507914ec56d21bb39ed - https://syzkaller.appspot.com/bug?extid=0635dc2e2c3c21a6aa04 In the reports similar to this one, all the attached reproducers configure taprio with very small timer intervals. I haven't gone through all the comments and proposed patches in those other reports yet, but I'm looking into them now. > How many hours were spent? > > And my 2cents suggestion sounds like sit back with netflix on. I would gladly do that, but it really bothers me that there's a single issue generating a flood of different bug reports on syzbot. As you rightly pointed out - how many hours have already been spent investigating them, and how many more will be wasted? >From what I can tell so far, this remains unfixed simply because no one has fixed it yet, correct? Please correct me if I'm wrong and missed other discussions on this topic. If that's the case, I'll try to propose some solutions for this issue. Best regards, Nikolay Ivchenko