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Wed, 11 Jun 2025 16:58:42 -0400 (EDT) Date: Wed, 11 Jun 2025 13:58:42 -0700 From: Boqun Feng To: syzbot Cc: 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=us-ascii Content-Disposition: inline In-Reply-To: <6849df90.a70a0220.cc01e.058d.GAE@google.com> X-Stat-Signature: th43yky5x7o8z48us5587i6cthnf6idk X-Rspamd-Queue-Id: 6BD1B40002 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1749675525-273918 X-HE-Meta: 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 lazsCjcU 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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 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. Regards, Boqun > kernel config: https://syzkaller.appspot.com/x/.config?x=713d218acd33d94 > dashboard link: https://syzkaller.appspot.com/bug?extid=80e5d6f453f14a53383a > compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 > patch: https://syzkaller.appspot.com/x/patch.diff?x=170e460c580000 > > Note: testing is done by a robot and is best-effort only. >