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[99.254.121.117]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6b08fe54d5dsm16847276d6.34.2024.06.12.11.17.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Jun 2024 11:17:28 -0700 (PDT) Date: Wed, 12 Jun 2024 14:17:26 -0400 From: Peter Xu To: Andrew Morton Cc: syzbot , linux-kernel@vger.kernel.org, linux-mm@kvack.org, pasha.tatashin@soleen.com, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [mm?] WARNING in __page_table_check_ptes_set (2) Message-ID: References: <000000000000b7b11a061ab49122@google.com> <20240612104735.ee6405d2096236bf18c51a41@linux-foundation.org> MIME-Version: 1.0 In-Reply-To: <20240612104735.ee6405d2096236bf18c51a41@linux-foundation.org> X-Mimecast-Spam-Score: 1 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline X-Rspamd-Queue-Id: EA723140014 X-Rspam-User: X-Rspamd-Server: rspam12 X-Stat-Signature: up9u97apwytrr3cc3j4s313dxujsqc6g X-HE-Tag: 1718216252-185609 X-HE-Meta: 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 xn38yc5Y vCAeh8VK1lgSAPvOVofUKl98fXjZjwCj5ST2w7MKOxlZqDXSFBluZ0lZ0xrCenNhI4nU9sFQGig+Qff8Zz3FlJFBGEHaeL1uZRaAQaxwf7mma9cyyWilLdkx9bRrM7eIf5WlIcCBbHk+96rkIqIFYBvKjtEwLqFtG3dUH75gKTHYFN35HKBuxE644JmEpQbrwAkUgGVvC/8ZGQRPbyJWwrs5T6EJee5ch1lehqQaUAPf06bjnM56TnpGcVcYvQm5jlaNHpBgSdiTLmT6VWg2HnWwmyPLDUA4LoybXoKIYDXcJW4fw08lUxRy3BOm+GRyAKPdg8Iqk0xpkY5gLNcU2vvHu9hnqpjjp2JCD2kwdwSR0UUA60gExK3IvUq3LTlRc+UHkE5CG3n9rRgvCa4sRL5ujrwWVKXv/6oNx28MGeQUf1tdIkCHYCdoBu3D0TXkA5GHFJCVoGcZZbuBHY5Ox3prLvn7+YHFfZ1hZk+H2hfk1/41eSwPjLvO4GZxbDoHnX80JWfZSkiWEEeD0wjfTnXoskoEGUCUnXLfVf+fpfunB/hHHS9xJnJcyGUZngrH8dQtRsof7kSQLNygPzg4SrQDouSqTCdGg+atK8wI/Q8bZmM+ue+EAZP/ktyqw7sG97SWWZ0dVzikVW9VDglYvVaaGik6lg1nyOdrZ3Moyevz2IQonkBGqRlb/YHtKYD6I2NSFOsWZ0t9ha+EZjJaljVmDwEyXtSKm598lVE8vlus3aorGPVLCEmUydWiDkK8XyZ97AfAqdKfTj5xLsCvSEXhv12ZDcrlARPjm91vHKjV/cOVWtjPZ2hogWZhoIiDLPzHZpBKPPIHkSvJ33TC6gVVzxfwI559L9MWZug77I1onVh9BAkDwRHj8IXnaAJyXyF9jlwI4vmD62DrdlZczvXRfPg== 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: Hi, Andrew, On Wed, Jun 12, 2024 at 10:47:35AM -0700, Andrew Morton wrote: > On Wed, 12 Jun 2024 10:18:21 -0700 syzbot wrote: > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 8867bbd4a056 mm: arm64: Fix the out-of-bounds issue in con.. > > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > > console output: https://syzkaller.appspot.com/x/log.txt?x=146b3d96980000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3b4350cf56c61c80 > > dashboard link: https://syzkaller.appspot.com/bug?extid=0b56d6ed0d0c0c9a79dc > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > userspace arch: arm64 > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > ... > > > > ------------[ cut here ]------------ > > WARNING: CPU: 1 PID: 1 at mm/page_table_check.c:198 page_table_check_pte_flags mm/page_table_check.c:198 [inline] > > WARNING: CPU: 1 PID: 1 at mm/page_table_check.c:198 __page_table_check_ptes_set+0x324/0x398 mm/page_table_check.c:211 > > if (pte_present(pte) && pte_uffd_wp(pte)) > WARN_ON_ONCE(pte_write(pte)); > > Let me optimistically cc Peter ;) Looks like this is the same issue that the other patch wanted to fix: [PATCH] mm/debug_vm_pgtable: Drop RANDOM_ORVALUE trick https://lore.kernel.org/r/20240523132139.289719-1-peterx@redhat.com I had a look, and indeed that patch hasn't reached arm64/for-kernelci branch. Thanks, -- Peter Xu