================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff8880ba40ec90 of 8 bytes by task 21 on cpu 0: writeback_sb_inodes+0x4b7/0xff0 fs/fs-writeback.c:1710 wb_writeback+0x28d/0x6f0 fs/fs-writeback.c:1894 wb_do_writeback+0x101/0x5f0 fs/fs-writeback.c:2039 wb_workfn+0xc8/0x470 fs/fs-writeback.c:2080 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff8880ba40ec90 of 8 bytes by task 28810 on cpu 1: __mark_inode_dirty+0xb9/0x7f0 fs/fs-writeback.c:2274 mark_buffer_dirty+0x14b/0x260 fs/buffer.c:1141 __block_commit_write fs/buffer.c:2084 [inline] block_commit_write fs/buffer.c:2476 [inline] block_page_mkwrite+0x25d/0x2e0 fs/buffer.c:2525 ext4_page_mkwrite+0x572/0xae0 fs/ext4/inode.c:5985 do_page_mkwrite mm/memory.c:2541 [inline] wp_page_shared+0x2d8/0x820 mm/memory.c:2870 do_wp_page+0x6cf/0x730 mm/memory.c:2963 handle_pte_fault mm/memory.c:4229 [inline] __handle_mm_fault mm/memory.c:4346 [inline] handle_mm_fault+0x1899/0x1af0 mm/memory.c:4444 do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1372 handle_page_fault arch/x86/mm/fault.c:1429 [inline] exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1482 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 28810 Comm: syz-executor.1 Not tainted 5.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================