================================================================== BUG: KCSAN: data-race in __add_to_page_cache_locked / nr_blockdev_pages read-write to 0xffff88810c298810 of 8 bytes by task 19725 on cpu 0: __add_to_page_cache_locked+0x39d/0x7b0 mm/filemap.c:888 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:939 pagecache_get_page+0x60f/0x980 mm/filemap.c:1839 grab_cache_page_write_begin+0x3f/0x70 mm/filemap.c:3475 block_write_begin+0x33/0x1b0 fs/buffer.c:2116 blkdev_write_begin+0x37/0x40 fs/block_dev.c:644 generic_perform_write+0x196/0x3a0 mm/filemap.c:3525 __generic_file_write_iter+0x15c/0x330 mm/filemap.c:3654 blkdev_write_iter+0x1f4/0x2a0 fs/block_dev.c:1905 call_write_iter include/linux/fs.h:1887 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x630/0x6b0 fs/read_write.c:586 ksys_write+0xce/0x180 fs/read_write.c:639 __do_sys_write fs/read_write.c:651 [inline] __se_sys_write fs/read_write.c:648 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:648 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810c298810 of 8 bytes by task 16787 on cpu 1: nr_blockdev_pages+0x7c/0xd0 fs/block_dev.c:946 si_meminfo+0x3a/0x60 mm/page_alloc.c:5330 update_defense_level+0x34/0x550 net/netfilter/ipvs/ip_vs_ctl.c:101 defense_work_handler+0x1b/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272 worker_thread+0x635/0xb90 kernel/workqueue.c:2418 kthread+0x1ff/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 16787 Comm: kworker/1:5 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_long defense_work_handler ==================================================================