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Mon, 24 Apr 2023 01:10:43 -0700 (PDT) Date: Mon, 24 Apr 2023 01:10:43 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001db82205fa108b35@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in generic_fillattr / shmem_unlink (3) From: syzbot To: akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: A658420011 X-Rspamd-Server: rspam09 X-Stat-Signature: 1uzoq54u9puwgt5q98nfga8wiqn4w95c X-HE-Tag: 1682323844-994193 X-HE-Meta: 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 4V87aXs7 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 urpg1zwn FgZ+x70rORj19iEM5UCMRjZ9Iade8cTuKftaC/g51FZ8AKU+GWDjg0pXg/rcPtZ6MGkJNQDv9WlIN2C/7ZpObubonUmMoFm8YjOjw+8Kt+5lkgESNsaICNaAwqHFRh1qfeLVdZeJBoixytXsm9jAVz3Pfz/1zL6U9O0gQ2dnCqaExIPdsShF4l0+DRtZ5cQ3uql9/ceuCsubL5LJS+lmqbVQmSTOpHo9rcX0CZULQKHaYi4BbevTw9lMNFX6BatprbrcofJre7Bx3vQiQqQpIVbyiQZuTIlgnwK+6Mofro+c9/fYlTogjg== 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: Hello, syzbot found the following issue on: HEAD commit: cb0856346a60 Merge tag 'mm-hotfixes-stable-2023-04-19-16-3.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10b9e8bfc80000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa4baf7c6b35b5d5 dashboard link: https://syzkaller.appspot.com/bug?extid=f682b67a78ce05867e78 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a02dd7789fb2/disk-cb085634.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a1a1eac454f6/vmlinux-cb085634.xz kernel image: https://storage.googleapis.com/syzbot-assets/bb0447014913/bzImage-cb085634.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f682b67a78ce05867e78@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in generic_fillattr / shmem_unlink read-write to 0xffff888104d167b8 of 8 bytes by task 23887 on cpu 1: shmem_unlink+0x102/0x190 mm/shmem.c:3036 vfs_unlink+0x261/0x3e0 fs/namei.c:4250 do_unlinkat+0x266/0x4f0 fs/namei.c:4316 __do_sys_unlink fs/namei.c:4364 [inline] __se_sys_unlink fs/namei.c:4362 [inline] __x64_sys_unlink+0x30/0x40 fs/namei.c:4362 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888104d167b8 of 8 bytes by task 27823 on cpu 0: i_size_read include/linux/fs.h:866 [inline] generic_fillattr+0x13f/0x1e0 fs/stat.c:58 shmem_getattr+0x32a/0x3b0 mm/shmem.c:1068 vfs_getattr_nosec+0x1e3/0x3c0 fs/stat.c:133 vfs_getattr fs/stat.c:170 [inline] vfs_statx+0x156/0x300 fs/stat.c:242 vfs_fstatat fs/stat.c:276 [inline] __do_sys_newfstatat fs/stat.c:446 [inline] __se_sys_newfstatat+0x8a/0x2a0 fs/stat.c:440 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:440 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x00000000000000c8 -> 0x00000000000000b4 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 27823 Comm: udevd Not tainted 6.3.0-rc7-syzkaller-00089-gcb0856346a60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 ================================================================== --- This report is generated by a bot. 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