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[95.203.1.180]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-553ac1ab650sm52500e87.91.2025.06.12.02.37.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Jun 2025 02:37:16 -0700 (PDT) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Thu, 12 Jun 2025 11:37:13 +0200 To: Aleksandr Nogikh Cc: Boqun Feng , syzbot , akpm@linux-foundation.org, josh@joshtriplett.org, kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, paulmck@kernel.org, rcu@vger.kernel.org, syzkaller-bugs@googlegroups.com, urezki@gmail.com Subject: Re: [syzbot] [bcachefs?] [rcu?] BUG: unable to handle kernel NULL pointer dereference in rcu_core (3) Message-ID: References: <6849df90.a70a0220.cc01e.058d.GAE@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Queue-Id: 3C72540002 X-Rspamd-Server: rspam07 X-Stat-Signature: yb3jeay8i3y3ewzembk8pnep8r55ef1x X-Rspam-User: X-HE-Tag: 1749721038-894905 X-HE-Meta: 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 LcGAjTUW 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 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: On Thu, Jun 12, 2025 at 09:42:32AM +0200, Aleksandr Nogikh wrote: > On Wed, Jun 11, 2025 at 10:58 PM Boqun Feng wrote: > > > > On Wed, Jun 11, 2025 at 12:57:04PM -0700, syzbot wrote: > > > Hello, > > > > > > syzbot has tested the proposed patch and the reproducer did not trigger any issue: > > > > > > Reported-by: syzbot+80e5d6f453f14a53383a@syzkaller.appspotmail.com > > > Tested-by: syzbot+80e5d6f453f14a53383a@syzkaller.appspotmail.com > > > > > > Tested on: > > > > > > commit: 488ef356 KEYS: Invert FINAL_PUT bit > > > git tree: upstream > > > console output: https://syzkaller.appspot.com/x/log.txt?x=129a660c580000 > > > > Is there a way to see the whole console output? If Ulad's patch fixes > > the exact issue, we should be able to see a WARN_ON_ONCE() triggered. > > If WARN_ON_ONCE() were triggered, the associated kernel panic output > would have been at the end of this log. > > > > > Regards, > > Boqun > > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=713d218acd33d94 > > > dashboard link: https://syzkaller.appspot.com/bug?extid=80e5d6f453f14a53383a > > FWIW the last time the bug was observed on syzbot was 100 days ago, so > it has likely been fixed since then or has become much harder to > reproduce. > That is even worse, if it is last for 100 days already. -- Uladzislau Rezki