================================================================== BUG: KCSAN: data-race in filemap_read / filemap_read write to 0xffff8881343bab90 of 8 bytes by task 26861 on cpu 1: filemap_read+0x44c/0x670 mm/filemap.c:2713 generic_file_read_iter+0x78/0x340 mm/filemap.c:2837 ext4_file_read_iter+0x1d8/0x2a0 call_read_iter include/linux/fs.h:1865 [inline] copy_splice_read+0x26b/0x4b0 fs/splice.c:367 vfs_splice_read fs/splice.c:993 [inline] splice_direct_to_actor+0x2aa/0x690 fs/splice.c:1070 do_splice_direct+0x10d/0x190 fs/splice.c:1195 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff8881343bab90 of 8 bytes by task 26866 on cpu 0: filemap_read+0x28b/0x670 mm/filemap.c:2685 generic_file_read_iter+0x78/0x340 mm/filemap.c:2837 ext4_file_read_iter+0x1d8/0x2a0 call_read_iter include/linux/fs.h:1865 [inline] copy_splice_read+0x26b/0x4b0 fs/splice.c:367 vfs_splice_read fs/splice.c:993 [inline] splice_direct_to_actor+0x2aa/0x690 fs/splice.c:1070 do_splice_direct+0x10d/0x190 fs/splice.c:1195 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x00000000000c6000 -> 0x00000000001e0004 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 26866 Comm: syz-executor.0 Not tainted 6.5.0-rc1-syzkaller-00033-geb26cbb1a754 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 ==================================================================