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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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: 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