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Mon, 24 Apr 2023 00:58:48 -0700 (PDT) Date: Mon, 24 Apr 2023 00:58:48 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000007337c705fa1060e2@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in generic_fillattr / shmem_mknod (2) 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-Server: rspam02 X-Rspamd-Queue-Id: CCF7F4001F X-Stat-Signature: q7be975fkqucb1fpzbptd7w7fc87dks8 X-HE-Tag: 1682323128-324203 X-HE-Meta: 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 /ZxJCwRR 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 9AmALNuQ tWPQDwXFdYANIeVY1HMsDkD/d7YhWdQYM8wj1y1VoNy58B76D4ecMmXmU1EG1zNo+tiSA5sMpstTxuGDZyuGdRh25oH5Ae7WcuhZhqY652nTeC54dQPDJ86+0ekBYTlM+FOQf459TdJunLN6PY7f6nJrFLZw6vOUGUaBEd3QLCl2dTqlV3ixYtrH7J4EU31p8PEeLnfO96Ea73i66xBmDH1VtOVv+E/9/sG0de5ejncL88XY7Ja/M5v0fvVupQD6mBgb3z5q0btdUWZdAn2oVkew8/ICcTycUU0rJebCMvyi430gN9drVg== 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: 457391b03803 Linux 6.3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13226cf0280000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c81c9a3d360ebcf dashboard link: https://syzkaller.appspot.com/bug?extid=702361cf7e3d95758761 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/6438dcb1c42d/disk-457391b0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/20596c249e47/vmlinux-457391b0.xz kernel image: https://storage.googleapis.com/syzbot-assets/cb715366a3e5/bzImage-457391b0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+702361cf7e3d95758761@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in generic_fillattr / shmem_mknod read-write to 0xffff8881049a9408 of 8 bytes by task 3383 on cpu 0: shmem_mknod+0xdd/0x180 mm/shmem.c:2942 shmem_create+0x34/0x40 mm/shmem.c:2994 lookup_open fs/namei.c:3416 [inline] open_last_lookups fs/namei.c:3484 [inline] path_openat+0xd96/0x1d00 fs/namei.c:3712 do_filp_open+0xf6/0x200 fs/namei.c:3742 do_sys_openat2+0xb5/0x2a0 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __x64_sys_openat+0xf3/0x120 fs/open.c:1375 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 0xffff8881049a9408 of 8 bytes by task 4291 on cpu 1: 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: 0x0000000000001644 -> 0x0000000000001658 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 4291 Comm: udevd Not tainted 6.3.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 ================================================================== --- This report is generated by a bot. 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