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Thu, 12 Jun 2025 00:42:43 -0700 (PDT) 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 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 58604140004 X-Stat-Signature: z8zyt1jhr138zhgr41n6akdqk34hczqa X-Rspam-User: X-HE-Tag: 1749714165-634649 X-HE-Meta: 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 PUU5HUEX 1RvaZxJzpw5NvHgMOxYnQGFpqzlNVrBTHugV6cvbLwawf08si1QEfapDfwfgs4R3L63U/YLJKy+eCZp5AndN/r5VC6Ib1Mdchql5of0UoPjjbVypCqnRBnk5ccg/KNfYD6LjSPx8iDRLHs1tpLpS8ZagvBeu8W3Pm7cw3YExdm2WKajmxqM2TWEVDq+pTh0OyxOKTdHFTet7Y7kiSSf4A/X8N1Mese1r2MlJcxr5WjcyC/rg= 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 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