================================================================== BUG: KCSAN: data-race in shmem_file_read_iter / shmem_setattr write to 0xffff888130610b40 of 8 bytes by task 3336 on cpu 1: i_size_write include/linux/fs.h:871 [inline] shmem_setattr+0x299/0x450 mm/shmem.c:1082 notify_change+0x8a3/0xa80 fs/attr.c:398 do_truncate fs/open.c:64 [inline] do_sys_ftruncate+0x405/0x4c0 fs/open.c:196 __do_sys_ftruncate fs/open.c:207 [inline] __se_sys_ftruncate fs/open.c:205 [inline] __x64_sys_ftruncate+0x2f/0x40 fs/open.c:205 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888130610b40 of 8 bytes by task 3328 on cpu 0: i_size_read include/linux/fs.h:849 [inline] shmem_file_read_iter+0x222/0x5c0 mm/shmem.c:2624 call_read_iter include/linux/fs.h:2108 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 3328 Comm: syz-executor.4 Tainted: G W 5.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================