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Received: from willy by casper.infradead.org with local (Exim 4.98.1 #2 (Red Hat Linux)) id 1txXZj-00000008D3Z-2VOJ; Wed, 26 Mar 2025 20:42:11 +0000 Date: Wed, 26 Mar 2025 20:42:11 +0000 From: Matthew Wilcox To: Nhat Pham Cc: ffhgfv , "vitaly.wool" , linmiaohe , akpm , linux-mm , linux-kernel Subject: Re: Linux6.14-rc5 BUG: spinlock bad magic in z3fold_zpool_free Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Queue-Id: 54FC114000B X-Stat-Signature: g6jb7mhftxbmsjkpjb7j7nw8xy1pzxb8 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1743021738-334050 X-HE-Meta: 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 +O+hBdrX qQCunfgwx+2bmFc+C4m04viqPq1GYyn80EekX+Ue6+VL1cSL9YZ7JY23YWd6lG3XXK+toPYPTfrKiOEKXSM+EG4wR1kwKdCm7CbFrWDT9KDi884eBFqTnEDCmGs313e5s/cYFv1mei/Bf18IFUnFVnJLKAfH10rApRphBMbXtTC0TJ7H9NKb2yNIC7iwxBdj8weINzkuOWfIH4C2KINaQOXzlktEa8T7AeKu1lbTdZnbPlFinvtE0YYFDLMymH1XipwtDZqa5/GN54hKQzuWH9Ons9ba5EdgSF0epzj0UkAj/+Fep0Q2KVJLWuhU++2IhZoaZUw+wT351hpCq10gIDnlOccZft0XelDuiWJfUd26ZcecUmo+FSNMwr1EFPVRAfIzWjxnGTTLuXoRNXV3ffL6Pc8/mGCXTxy5Vc57pZaCbF9Cabtau+2TA76CitOgbAD8MKki0ENWuecg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.001849, 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, Mar 26, 2025 at 03:43:28PM -0400, Nhat Pham wrote: > On Wed, Mar 26, 2025 at 10:32 AM Nhat Pham wrote: > > On Wed, Mar 26, 2025 at 10:11 AM ffhgfv wrote: > > > > > > Hello, I found a bug titled " BUG: spinlock bad magic in z3fold_zpool_free " with modified syzkaller in the Linux6.14-rc5. > > > If you fix this issue, please add the following tag to the commit: Reported-by: Jianzhou Zhao , xingwei lee , Zhizhuo Tang > > > > Please stop using z3fold :) We already removed it upstream. > > To clarify a little bit - we've found that z3fold is buggy (for a very > long time), and does not outperform zsmalloc in many of the workloads > we test on (both microbenchmark and real production workloads). We've > deprecated it since 6.12: > > https://github.com/torvalds/linux/commit/7a2369b74abf76cd3e54c45b30f6addb497f831b > > and will remove it altogether: > > https://lore.kernel.org/all/20250129180633.3501650-1-yosry.ahmed@linux.dev/ > > Perhaps Vitaly can fix the issue for stability's sake (or in case > there is a reason why you MUST use z3fold)? But I strongly recommend > you experiment with zsmalloc :) This group are syzkaller kiddies. They have no understanding of what they're testing; they're just running their fuzzer and sending emails. They don't care what's useful, so there's a lot of noise from unmaintained filesystems and so on.