================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode write to 0xffff88811d8c7b00 of 8 bytes by task 28 on cpu 1: __writeback_single_inode+0x338/0x910 fs/fs-writeback.c:1486 writeback_sb_inodes+0x4c8/0xa10 fs/fs-writeback.c:1716 wb_writeback+0x1f9/0x6a0 fs/fs-writeback.c:1892 wb_do_writeback fs/fs-writeback.c:2037 [inline] wb_workfn+0x215/0x970 fs/fs-writeback.c:2078 process_one_work+0x424/0x930 kernel/workqueue.c:2268 worker_thread+0x9a/0x7e0 kernel/workqueue.c:2414 kthread+0x203/0x230 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffff88811d8c7b00 of 8 bytes by task 25877 on cpu 0: __mark_inode_dirty+0xb6/0x940 fs/fs-writeback.c:2272 mark_buffer_dirty+0x28b/0x2b0 fs/buffer.c:1150 __block_commit_write.isra.0+0x11d/0x170 fs/buffer.c:2075 block_commit_write fs/buffer.c:2467 [inline] block_page_mkwrite+0x21d/0x230 fs/buffer.c:2516 ext4_page_mkwrite+0x4e8/0x820 fs/ext4/inode.c:5958 do_page_mkwrite+0xfa/0x210 mm/memory.c:2529 wp_page_shared mm/memory.c:2856 [inline] do_wp_page+0xa07/0xca0 mm/memory.c:2973 handle_pte_fault mm/memory.c:4231 [inline] __handle_mm_fault+0x2a65/0x2ec0 mm/memory.c:4345 handle_mm_fault+0x21c/0x540 mm/memory.c:4382 do_user_addr_fault arch/x86/mm/fault.c:1464 [inline] do_page_fault+0x48a/0xa96 arch/x86/mm/fault.c:1535 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 25877 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================