================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff8880bb6ce280 of 8 bytes by task 21 on cpu 1: inode_sync_complete fs/fs-writeback.c:1197 [inline] writeback_sb_inodes+0xb19/0xe00 fs/fs-writeback.c:1744 wb_writeback+0x2b8/0x730 fs/fs-writeback.c:1892 wb_do_writeback+0x108/0x600 fs/fs-writeback.c:2037 wb_workfn+0xb8/0x430 fs/fs-writeback.c:2078 process_one_work+0x3cb/0x990 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x210/0x220 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 read to 0xffff8880bb6ce280 of 8 bytes by task 621 on cpu 0: __mark_inode_dirty+0xb9/0x7d0 fs/fs-writeback.c:2272 mark_inode_dirty include/linux/fs.h:2192 [inline] generic_write_end+0x174/0x2a0 fs/buffer.c:2203 ext4_da_write_end+0x55e/0x6d0 fs/ext4/inode.c:3092 generic_perform_write+0x233/0x380 mm/filemap.c:3310 ext4_buffered_write_iter+0x2b1/0x390 fs/ext4/file.c:270 ext4_file_write_iter+0x4a3/0xfd0 fs/ext4/file.c:498 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write fs/read_write.c:484 [inline] __vfs_write+0x2d8/0x340 fs/read_write.c:497 vfs_write+0x19b/0x350 fs/read_write.c:559 ksys_write+0xce/0x180 fs/read_write.c:612 __do_sys_write fs/read_write.c:624 [inline] __se_sys_write fs/read_write.c:621 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:621 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 621 Comm: syz-executor.5 Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================