================================================================== BUG: KCSAN: data-race in __writeback_single_inode / ext4_sync_file read-write to 0xffff88800ba2ca90 of 8 bytes by task 19008 on cpu 1: __writeback_single_inode+0x248/0x560 fs/fs-writeback.c:1492 writeback_single_inode+0x126/0x580 fs/fs-writeback.c:1570 sync_inode fs/fs-writeback.c:2606 [inline] sync_inode_metadata+0x52/0x70 fs/fs-writeback.c:2626 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0x335/0x690 fs/ext4/fsync.c:170 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2725 [inline] ext4_buffered_write_iter+0x363/0x3b0 fs/ext4/file.c:276 ext4_file_write_iter+0x480/0x10b0 fs/ext4/file.c:501 call_write_iter include/linux/fs.h:1887 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:721 do_iter_write+0x112/0x4b0 fs/read_write.c:847 vfs_iter_write+0x4c/0x70 fs/read_write.c:888 iter_file_splice_write+0x42a/0x780 fs/splice.c:769 do_splice_from fs/splice.c:865 [inline] direct_splice_actor+0x95/0x150 fs/splice.c:1035 splice_direct_to_actor+0x365/0x660 fs/splice.c:990 do_splice_direct+0xf5/0x170 fs/splice.c:1078 do_sendfile+0x574/0xb70 fs/read_write.c:1238 __do_sys_sendfile64 fs/read_write.c:1293 [inline] __se_sys_sendfile64 fs/read_write.c:1285 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1285 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88800ba2ca90 of 8 bytes by task 19026 on cpu 0: ext4_fsync_nojournal fs/ext4/fsync.c:87 [inline] ext4_sync_file+0x26c/0x690 fs/ext4/fsync.c:170 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2725 [inline] ext4_buffered_write_iter+0x363/0x3b0 fs/ext4/file.c:276 ext4_file_write_iter+0x480/0x10b0 fs/ext4/file.c:501 call_write_iter include/linux/fs.h:1887 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:721 do_iter_write+0x112/0x4b0 fs/read_write.c:847 vfs_iter_write+0x4c/0x70 fs/read_write.c:888 iter_file_splice_write+0x42a/0x780 fs/splice.c:769 do_splice_from fs/splice.c:865 [inline] direct_splice_actor+0x95/0x150 fs/splice.c:1035 splice_direct_to_actor+0x365/0x660 fs/splice.c:990 do_splice_direct+0xf5/0x170 fs/splice.c:1078 do_sendfile+0x574/0xb70 fs/read_write.c:1238 __do_sys_sendfile64 fs/read_write.c:1293 [inline] __se_sys_sendfile64 fs/read_write.c:1285 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1285 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 19026 Comm: syz-executor.2 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================