================================================================== BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages read-write to 0xffff8881005f3130 of 8 bytes by task 12276 on cpu 1: __filemap_add_folio+0x5b9/0x7d0 mm/filemap.c:928 filemap_add_folio+0x98/0x1b0 mm/filemap.c:969 page_cache_ra_unbounded+0x1f3/0x380 mm/readahead.c:275 do_page_cache_ra mm/readahead.c:327 [inline] page_cache_ra_order mm/readahead.c:532 [inline] page_cache_async_ra+0x438/0x440 mm/readahead.c:687 filemap_readahead mm/filemap.c:2571 [inline] filemap_get_pages+0x510/0x1150 mm/filemap.c:2616 filemap_splice_read+0x333/0x6b0 mm/filemap.c:2990 do_splice_read fs/splice.c:979 [inline] splice_direct_to_actor+0x26f/0x680 fs/splice.c:1083 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0xda/0x150 fs/splice.c:1227 do_sendfile+0x380/0x650 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1417 x64_sys_call+0xb39/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff8881005f3130 of 8 bytes by task 3557 on cpu 0: nr_blockdev_pages+0x7e/0xd0 block/bdev.c:523 si_meminfo+0x87/0xd0 mm/show_mem.c:80 update_defense_level+0x47/0x5c0 net/netfilter/ipvs/ip_vs_ctl.c:102 defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3321 worker_thread+0x582/0x770 kernel/workqueue.c:3402 kthread+0x489/0x510 kernel/kthread.c:464 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x00000000000000ff -> 0x0000000000000100 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3557 Comm: kworker/0:6 Tainted: G W 6.16.0-rc4-syzkaller-00308-ga79a588fc176 #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_long defense_work_handler ==================================================================