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AJvYcCUHR7FwaVpHYPVn5CNeng9Rz66NBcuaHh6bjeEVuHWasRGANF6oB98z1QkJ3vXq5Yelpwep7t+5WQ==@kvack.org X-Gm-Message-State: AOJu0YzroIoc6TrDFWmLviPmasQgFiQqQ43Ym9G4L5Uq4hwIRpSRCVx5 UKKSri8MHMUCSJAY7Tqh7Lwlg3lsIvz1C+WeTD6cyDT7u1YonN7bgCyaPLv8Xo3mvAnDT107Joh yQb5nZlKWR2NaEjVodc+JmumaSGo= X-Gm-Gg: ASbGncu0H3U3JZea5p9IHnKD0fN4FdogbpQy2N+cvcrt+rd43Bbnia8dkA8okNKamdo VpGoaye55si1k7Ykgl+EYRZwevUosAJrkefWTcuVfFaHt0qRWMww1hWSAqnjBLKn8zgKqFo1p3n +LpPzVuL1QAe+6D1MB2I7fjURm X-Google-Smtp-Source: AGHT+IFmVUdRMPT0jOoO+WnV3SCwL4L2KHCpdirUKfb/Y+CP0Y7a7L4QWgyfiMBN9yXO+A9DvjPj409roZoHIlgYGYI= X-Received: by 2002:a05:6214:410f:b0:6e8:9e9c:d20f with SMTP id 6a1803df08f44-6ed23897d79mr63094496d6.21.1743085372831; Thu, 27 Mar 2025 07:22:52 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Nhat Pham Date: Thu, 27 Mar 2025 10:22:41 -0400 X-Gm-Features: AQ5f1Jpcqo2aPvJKeqa0SWvW6GV0i6-uOAUDw9ucZg5DBq1PSgU1PPwluoGO3Qw Message-ID: Subject: Re: Linux6.14-rc5 BUG: spinlock bad magic in z3fold_zpool_free To: Matthew Wilcox Cc: ffhgfv , "vitaly.wool" , linmiaohe , akpm , linux-mm , linux-kernel Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: E8DC312000C X-Stat-Signature: 4hca4dfqdpjg5y78mt8bn6mudrpnsena X-HE-Tag: 1743085373-234651 X-HE-Meta: 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 4e8O7zfQ 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.071549, 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 4:42=E2=80=AFPM Matthew Wilcox wrote: > > On Wed, Mar 26, 2025 at 03:43:28PM -0400, Nhat Pham wrote: > > On Wed, Mar 26, 2025 at 10:32=E2=80=AFAM Nhat Pham = wrote: > > > On Wed, Mar 26, 2025 at 10:11=E2=80=AFAM ffhgfv = wrote: > > > > > > > > Hello, I found a bug titled " BUG: spinlock bad magic in z3fold_zpo= ol_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/7a2369b74abf76cd3e54c45b30f6ad= db497f831b > > > > 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 unmaintaine= d > filesystems and so on. You're right - I just realized they did it once already for zswap: https://lore.kernel.org/all/tencent_49DA3E780998A9B96ADC9FF658CC84641808@qq= .com/ It was also due to the (soon-to-be-removed) z3fold backend. To save time, I'll stop engaging from now on, unless it's a proper issue.