================================================================== BUG: KCSAN: data-race in generic_file_read_iter / simple_write_end write to 0xffff8881257ae3a8 of 8 bytes by task 32177 on cpu 0: i_size_write include/linux/fs.h:888 [inline] simple_write_end+0x1d0/0x370 fs/libfs.c:517 generic_perform_write+0x1d3/0x320 mm/filemap.c:3320 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3438 generic_file_write_iter+0x28c/0x38c mm/filemap.c:3470 call_write_iter include/linux/fs.h:1902 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x530/0x840 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881257ae3a8 of 8 bytes by task 32193 on cpu 1: generic_file_buffered_read mm/filemap.c:2106 [inline] generic_file_read_iter+0x860/0x1440 mm/filemap.c:2324 call_read_iter include/linux/fs.h:1896 [inline] generic_file_splice_read+0x35c/0x500 fs/splice.c:313 do_splice_to+0xf2/0x130 fs/splice.c:892 splice_direct_to_actor+0x1b6/0x540 fs/splice.c:971 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 32193 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================