================================================================== BUG: KCSAN: data-race in vfs_fsync_range / writeback_single_inode write to 0xffff888107582f60 of 8 bytes by task 11338 on cpu 0: writeback_single_inode+0x10e/0x4a0 fs/fs-writeback.c:1743 sync_inode_metadata+0x56/0x80 fs/fs-writeback.c:2808 generic_buffers_fsync_noflush+0xe4/0x120 fs/buffer.c:613 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] ext4_sync_file+0x206/0x6c0 fs/ext4/fsync.c:151 vfs_fsync_range+0x111/0x120 fs/sync.c:188 generic_write_sync include/linux/fs.h:2653 [inline] ext4_buffered_write_iter+0x334/0x370 fs/ext4/file.c:305 ext4_file_write_iter+0x297/0xe10 do_iter_write+0x4ad/0x770 fs/read_write.c:860 vfs_iter_write+0x56/0x70 fs/read_write.c:901 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736 do_splice_from fs/splice.c:933 [inline] direct_splice_actor+0x8a/0xb0 fs/splice.c:1142 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088 do_splice_direct+0x10d/0x190 fs/splice.c:1194 do_sendfile+0x3c4/0x980 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:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b read to 0xffff888107582f60 of 8 bytes by task 11363 on cpu 1: vfs_fsync_range+0xa2/0x120 fs/sync.c:186 generic_write_sync include/linux/fs.h:2653 [inline] ext4_buffered_write_iter+0x334/0x370 fs/ext4/file.c:305 ext4_file_write_iter+0x297/0xe10 do_iter_write+0x4ad/0x770 fs/read_write.c:860 vfs_iter_write+0x56/0x70 fs/read_write.c:901 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736 do_splice_from fs/splice.c:933 [inline] direct_splice_actor+0x8a/0xb0 fs/splice.c:1142 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088 do_splice_direct+0x10d/0x190 fs/splice.c:1194 do_sendfile+0x3c4/0x980 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:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b value changed: 0x0000000000000007 -> 0x0000000000000004 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 11363 Comm: syz-executor.2 Not tainted 6.7.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 ==================================================================