================================================================== BUG: KCSAN: data-race in __delete_from_page_cache / ext4_writepages write to 0xffff8880b000bcf8 of 8 bytes by task 1768 on cpu 0: page_cache_delete mm/filemap.c:153 [inline] __delete_from_page_cache+0x1d8/0x4a0 mm/filemap.c:238 __remove_mapping+0x2db/0x530 mm/vmscan.c:939 shrink_page_list+0xf57/0x2710 mm/vmscan.c:1439 shrink_inactive_list+0x3d1/0x920 mm/vmscan.c:1959 shrink_list mm/vmscan.c:2178 [inline] shrink_lruvec+0x4c8/0xd20 mm/vmscan.c:2496 shrink_node_memcgs mm/vmscan.c:2685 [inline] shrink_node+0x2fe/0xfe0 mm/vmscan.c:2791 kswapd_shrink_node mm/vmscan.c:3539 [inline] balance_pgdat+0x68d/0xda0 mm/vmscan.c:3697 kswapd+0x35b/0x800 mm/vmscan.c:3948 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffff8880b000bcf8 of 8 bytes by task 14434 on cpu 1: ext4_writepages+0x188/0x2500 fs/ext4/inode.c:2638 do_writepages+0x6b/0x170 mm/page-writeback.c:2344 __writeback_single_inode+0xaf/0x8e0 fs/fs-writeback.c:1452 writeback_sb_inodes+0x4ba/0xa50 fs/fs-writeback.c:1716 __writeback_inodes_wb+0xe8/0x1b0 fs/fs-writeback.c:1785 wb_writeback+0x557/0x6a0 fs/fs-writeback.c:1894 wb_check_start_all fs/fs-writeback.c:2018 [inline] wb_do_writeback fs/fs-writeback.c:2044 [inline] wb_workfn+0x748/0x970 fs/fs-writeback.c:2078 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264 worker_thread+0xa0/0x800 kernel/workqueue.c:2410 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 14434 Comm: kworker/u4:1 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ==================================================================