================================================================== BUG: KCSAN: data-race in filemap_read / filemap_read write to 0xffff888102bb25b0 of 8 bytes by task 22117 on cpu 1: filemap_read+0xf2c/0x1220 mm/filemap.c:2609 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701 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_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888102bb25b0 of 8 bytes by task 22120 on cpu 0: filemap_read+0xdd4/0x1220 mm/filemap.c:2578 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701 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_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000000cbc00 -> 0x00000000000cce00 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 22120 Comm: syz-executor.1 Tainted: G W 5.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================