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@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== 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. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.