================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff88811ed1d1c0 of 8 bytes by task 29 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 0xffff88811ed1d1c0 of 8 bytes by task 17683 on cpu 0: __mark_inode_dirty+0xb9/0x7d0 fs/fs-writeback.c:2272 mark_buffer_dirty+0x11e/0x230 fs/buffer.c:1142 __block_commit_write+0xf1/0x160 fs/buffer.c:2085 block_commit_write fs/buffer.c:2477 [inline] block_page_mkwrite+0x181/0x1b0 fs/buffer.c:2526 ext4_page_mkwrite+0x572/0x9e0 fs/ext4/inode.c:5985 do_page_mkwrite mm/memory.c:2526 [inline] wp_page_shared+0x2b9/0x760 mm/memory.c:2854 do_wp_page+0xb70/0xd40 mm/memory.c:2972 handle_pte_fault mm/memory.c:4232 [inline] __handle_mm_fault mm/memory.c:4346 [inline] handle_mm_fault+0x1658/0x18a0 mm/memory.c:4383 do_user_addr_fault+0x393/0x810 arch/x86/mm/fault.c:1295 handle_page_fault arch/x86/mm/fault.c:1365 [inline] exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1418 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 17683 Comm: syz-executor.4 Not tainted 5.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================