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[103.168.172.200]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6fb35b303a7sm12345696d6.36.2025.06.12.10.20.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Jun 2025 10:20:35 -0700 (PDT) Received: from phl-compute-01.internal (phl-compute-01.phl.internal [10.202.2.41]) by mailfauth.phl.internal (Postfix) with ESMTP id D943B1200068; Thu, 12 Jun 2025 13:20:34 -0400 (EDT) Received: from phl-imap-16 ([10.202.2.88]) by phl-compute-01.internal (MEProxy); Thu, 12 Jun 2025 13:20:34 -0400 X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtddugdduheeihecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpggftfghnshhusghstghrihgsvgdp uffrtefokffrpgfnqfghnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivg hnthhsucdlqddutddtmdenucfjughrpefoggffhffvvefkjghfufgtgfesthhqredtredt jeenucfhrhhomhepfdeuohhquhhnucfhvghnghdfuceosghoqhhunhdrfhgvnhhgsehgmh grihhlrdgtohhmqeenucggtffrrghtthgvrhhnpeektddukeevudehkeelvdeugfdtteeh fefgkeeltedvveefheejheegieevffehjeenucffohhmrghinhepshihiihkrghllhgvrh drrghpphhsphhothdrtghomhenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhep mhgrihhlfhhrohhmpegsohhquhhnodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhith ihqdeiledvgeehtdeigedqudejjeekheehhedvqdgsohhquhhnrdhfvghngheppehgmhgr ihhlrdgtohhmsehfihigmhgvrdhnrghmvgdpnhgspghrtghpthhtohepuddvpdhmohguvg epshhmthhpohhuthdprhgtphhtthhopehurhgviihkihesghhmrghilhdrtghomhdprhgt phhtthhopehnohhgihhkhhesghhoohhglhgvrdgtohhmpdhrtghpthhtohepshihiihkrg hllhgvrhdqsghughhssehgohhoghhlvghgrhhouhhpshdrtghomhdprhgtphhtthhopehj ohhshhesjhhoshhhthhrihhplhgvthhtrdhorhhgpdhrtghpthhtohepphgruhhlmhgtkh eskhgvrhhnvghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqmhhmsehkvhgrtghkrdho rhhgpdhrtghpthhtoheprghkphhmsehlihhnuhigqdhfohhunhgurghtihhonhdrohhrgh dprhgtphhtthhopehkvghnthdrohhvvghrshhtrhgvvghtsehlihhnuhigrdguvghvpdhr tghpthhtohepshihiigsohhtodektdgvheguiehfgeehfehfudegrgehfeefkeefrgessh ihiihkrghllhgvrhdrrghpphhsphhothhmrghilhdrtghomh X-ME-Proxy: Feedback-ID: iad51458e:Fastmail Received: by mailuser.phl.internal (Postfix, from userid 501) id AE9032CC0081; Thu, 12 Jun 2025 13:20:34 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: T151d60db33cdf832 Date: Thu, 12 Jun 2025 10:20:09 -0700 From: "Boqun Feng" To: "Uladzislau Rezki (Sony)" , "Aleksandr Nogikh" Cc: syzbot , "Andrew Morton" , "Josh Triplett" , kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Paul E. McKenney" , rcu@vger.kernel.org, syzkaller-bugs@googlegroups.com Message-Id: <112773d5-4056-4c9c-8a13-95056ed48c98@app.fastmail.com> In-Reply-To: References: <6849df90.a70a0220.cc01e.058d.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] [rcu?] BUG: unable to handle kernel NULL pointer dereference in rcu_core (3) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Thu, Jun 12, 2025, at 2:37 AM, Uladzislau Rezki wrote: > On Thu, Jun 12, 2025 at 09:42:32AM +0200, Aleksandr Nogikh wrote: >> 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 t= rigger 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=3D129a6= 60c580000 >> > >> > Is there a way to see the whole console output? If Ulad's patch fix= es >> > the exact issue, we should be able to see a WARN_ON_ONCE() triggere= d. >>=20 >> If WARN_ON_ONCE() were triggered, the associated kernel panic output >> would have been at the end of this log. >>=20 >> > >> > Regards, >> > Boqun >> > >> > > kernel config: https://syzkaller.appspot.com/x/.config?x=3D713d2= 18acd33d94 >> > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D80e5d6f= 453f14a53383a >>=20 >> 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. >>=20 > That is even worse, if it is last for 100 days already. > My understanding is that the evidence shows that the issue that directly caused null-ptr-derek the has been fixed 100 days ago. Regards, Boqun > -- > Uladzislau Rezki