================================================================== BUG: KCSAN: data-race in filemap_read / filemap_read write to 0xffff88813369f390 of 8 bytes by task 29405 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:1871 [inline] copy_splice_read+0x26b/0x4b0 fs/splice.c:367 vfs_splice_read fs/splice.c:995 [inline] splice_direct_to_actor+0x2aa/0x690 fs/splice.c:1072 do_splice_direct+0x10d/0x190 fs/splice.c:1197 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 write to 0xffff88813369f390 of 8 bytes by task 29408 on cpu 0: 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:1871 [inline] copy_splice_read+0x26b/0x4b0 fs/splice.c:367 vfs_splice_read fs/splice.c:995 [inline] splice_direct_to_actor+0x2aa/0x690 fs/splice.c:1072 do_splice_direct+0x10d/0x190 fs/splice.c:1197 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: 0x0000000003a19000 -> 0x000000000275f000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 29408 Comm: syz-executor.4 Not tainted 6.5.0-rc7-syzkaller-00104-g4f9e7fabf864 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 ==================================================================