================================================================== BUG: KCSAN: data-race in generic_file_read_iter / generic_file_read_iter read to 0xffff888120e343b0 of 8 bytes by task 12549 on cpu 0: generic_file_buffered_read mm/filemap.c:2029 [inline] generic_file_read_iter+0x360/0x1440 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:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff888120e343b0 of 8 bytes by task 12555 on cpu 1: generic_file_buffered_read mm/filemap.c:2255 [inline] generic_file_read_iter+0xaf8/0x1440 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:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x12a/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: 12555 Comm: syz-executor.0 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================