================================================================== BUG: KCSAN: data-race in filemap_read / truncate_setsize write to 0xffff888124024888 of 8 bytes by task 2933 on cpu 0: i_size_write include/linux/fs.h:871 [inline] truncate_setsize+0x2a/0xc0 mm/truncate.c:775 simple_setattr+0x87/0xb0 fs/libfs.c:535 notify_change+0x8e6/0xa00 fs/attr.c:410 do_truncate+0xf7/0x140 fs/open.c:65 handle_truncate fs/namei.c:3176 [inline] do_open fs/namei.c:3524 [inline] path_openat+0x1834/0x1b30 fs/namei.c:3653 do_filp_open+0x105/0x220 fs/namei.c:3680 do_sys_openat2+0xb5/0x2a0 fs/open.c:1278 do_sys_open fs/open.c:1294 [inline] __do_sys_creat fs/open.c:1370 [inline] __se_sys_creat fs/open.c:1364 [inline] __x64_sys_creat+0x62/0x80 fs/open.c:1364 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 read to 0xffff888124024888 of 8 bytes by task 2930 on cpu 1: i_size_read include/linux/fs.h:849 [inline] filemap_read+0xde9/0x1400 mm/filemap.c:2691 generic_file_read_iter+0x72/0x320 mm/filemap.c:2825 call_read_iter include/linux/fs.h:2052 [inline] generic_file_splice_read+0x1de/0x2c0 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2ac/0x660 fs/splice.c:870 do_splice_direct+0xfb/0x180 fs/splice.c:979 do_sendfile+0x3ad/0x900 fs/read_write.c:1262 __do_sys_sendfile64 fs/read_write.c:1327 [inline] __se_sys_sendfile64 fs/read_write.c:1313 [inline] __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1313 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 value changed: 0x0000000000282601 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2930 Comm: syz-executor.2 Not tainted 5.19.0-rc1-syzkaller-00023-g34f4335c16a5-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================