================================================================== BUG: KCSAN: data-race in vfs_fsync_range / writeback_single_inode write to 0xffff888106009f80 of 8 bytes by task 4822 on cpu 0: writeback_single_inode+0x10e/0x4a0 fs/fs-writeback.c:1743 sync_inode_metadata+0x56/0x80 fs/fs-writeback.c:2808 __generic_file_fsync+0xf9/0x140 fs/libfs.c:1449 fat_file_fsync+0x4c/0x100 fs/fat/file.c:191 vfs_fsync_range+0x111/0x120 fs/sync.c:188 generic_write_sync include/linux/fs.h:2732 [inline] generic_file_write_iter+0x191/0x1c0 mm/filemap.c:4055 call_write_iter include/linux/fs.h:2085 [inline] iter_file_splice_write+0x5de/0x950 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x167/0x2c0 fs/splice.c:1164 splice_direct_to_actor+0x2fb/0x660 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x3b9/0x960 fs/read_write.c:1295 __do_sys_sendfile64 fs/read_write.c:1362 [inline] __se_sys_sendfile64 fs/read_write.c:1348 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b read to 0xffff888106009f80 of 8 bytes by task 4837 on cpu 1: vfs_fsync_range+0xa2/0x120 fs/sync.c:186 generic_write_sync include/linux/fs.h:2732 [inline] generic_file_write_iter+0x191/0x1c0 mm/filemap.c:4055 call_write_iter include/linux/fs.h:2085 [inline] iter_file_splice_write+0x5de/0x950 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x167/0x2c0 fs/splice.c:1164 splice_direct_to_actor+0x2fb/0x660 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x3b9/0x960 fs/read_write.c:1295 __do_sys_sendfile64 fs/read_write.c:1362 [inline] __se_sys_sendfile64 fs/read_write.c:1348 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b value changed: 0x0000000000000007 -> 0x0000000000000084 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 4837 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00410-gc02197fc9076 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 ==================================================================