================================================================== BUG: KCSAN: data-race in __writeback_single_inode / xas_set_mark write to 0xffff8880bb45a76c of 4 bytes by task 22955 on cpu 0: xa_mark_set lib/xarray.c:69 [inline] xas_set_mark lib/xarray.c:886 [inline] xas_set_mark+0x140/0x150 lib/xarray.c:870 __xa_set_mark+0xdd/0x110 lib/xarray.c:1708 __set_page_dirty+0x151/0x270 fs/buffer.c:618 mark_buffer_dirty+0x26e/0x2b0 fs/buffer.c:1146 __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+0x2d96/0x2da0 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 read to 0xffff8880bb45a76c of 4 bytes by task 15542 on cpu 1: mapping_tagged include/linux/fs.h:521 [inline] __writeback_single_inode+0x376/0x910 fs/fs-writeback.c:1502 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 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 15542 Comm: kworker/u4:3 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ==================================================================