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AJvYcCUk4XGKIK+D/eWCquagtlRBXzbdZiMMaE1ySLM37TNlDjQXduDWD4QumA890Dvo8iWkPiC2UtMt+fMBe2U=@vger.kernel.org X-Gm-Message-State: AOJu0Yz2rJ63GD4gIOiw+G+Ke4gmgV6IyRXMX8qOPqHtVFPCfzMRpOiX 9BcliG559pdHy+788zm4ZNSpF+6y6jByNudGuGasinV3VUg0D3BVvzDAhrC9DtkM/3TtQsgdrg/ hJK+rSvCE0oPMI2tjOJwAyusRJJY+UwhfFGYOp+Bz X-Gm-Gg: ASbGncte3+G88hToI9AJoE3PDBySyrqgY900fC32mG7CYg6K3vP+jgOT5qK4byxJ3b1 7rWHifK8y1aaaZVDeDmHwjG1QE53SHCSyRd4apD3vUffaK2OAJVAwIro9C6t11pi/nd7/dBWFzs IrxnymDdAZalG4Gfr2egOC0uBJ/XC0fbDiPIENHMxtgv111wtOapGNnWRqT4KsrBrCMdm4fydAa w== X-Google-Smtp-Source: AGHT+IHWfz6ueRsBMvrL8ANKlYfntcz1uoa4QJR1XOifNxP+96m170S+IXM1efDQIk8mUoonHiE6qKHXDmQCeffxrW4= X-Received: by 2002:a17:903:2448:b0:234:c86d:4572 with SMTP id d9443c01a7336-2364d8b7d4cmr29659685ad.30.1749714163932; Thu, 12 Jun 2025 00:42:43 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <6849df90.a70a0220.cc01e.058d.GAE@google.com> In-Reply-To: From: Aleksandr Nogikh Date: Thu, 12 Jun 2025 09:42:32 +0200 X-Gm-Features: AX0GCFtO9O5G9ZnuVX3i1JpfXbgajBNsH_rdffk0L3gbJwN5FPeRccN9TijpSvM Message-ID: Subject: Re: [syzbot] [bcachefs?] [rcu?] BUG: unable to handle kernel NULL pointer dereference in rcu_core (3) To: Boqun Feng Cc: 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 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, Jun 11, 2025 at 10:58=E2=80=AFPM 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=3D129a660c580= 000 > > 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=3D713d218acd3= 3d94 > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D80e5d6f453f14= a53383a 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. > > compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07= 757-1~exp1~20250514183223.118), Debian LLD 20.1.6 > > patch: https://syzkaller.appspot.com/x/patch.diff?x=3D170e460c= 580000 > > > > Note: testing is done by a robot and is best-effort only. > > > --=20 Aleksandr