================================================================== BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages read-write to 0xffff888100630570 of 8 bytes by task 4520 on cpu 1: __filemap_add_folio+0x5b9/0x7d0 mm/filemap.c:928 filemap_add_folio+0x98/0x1b0 mm/filemap.c:969 __filemap_get_folio+0x31e/0x650 mm/filemap.c:1979 grow_dev_folio fs/buffer.c:1052 [inline] grow_buffers fs/buffer.c:1118 [inline] __getblk_slow fs/buffer.c:1144 [inline] bdev_getblk+0x188/0x3d0 fs/buffer.c:1466 __bread_gfp+0x51/0x250 fs/buffer.c:1520 sb_bread include/linux/buffer_head.h:348 [inline] fat__get_entry fs/fat/dir.c:100 [inline] fat_get_entry+0x46e/0x5d0 fs/fat/dir.c:128 fat_get_short_entry fs/fat/dir.c:885 [inline] fat_subdirs+0x59/0x190 fs/fat/dir.c:951 fat_read_root+0x316/0x360 fs/fat/inode.c:1345 fat_fill_super+0x15bf/0x1ce0 fs/fat/inode.c:1814 vfat_fill_super+0x24/0x30 fs/fat/namei_vfat.c:1197 get_tree_bdev_flags+0x28e/0x300 fs/super.c:1636 get_tree_bdev+0x1f/0x30 fs/super.c:1659 vfat_get_tree+0x1c/0x30 fs/fat/namei_vfat.c:1202 vfs_get_tree+0x54/0x1d0 fs/super.c:1759 do_new_mount+0x207/0x680 fs/namespace.c:3884 path_mount+0x4a4/0xb20 fs/namespace.c:4211 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4412 __x64_sys_mount+0x67/0x80 fs/namespace.c:4412 x64_sys_call+0xd36/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888100630570 of 8 bytes by task 10 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:3319 worker_thread+0x582/0x770 kernel/workqueue.c:3400 kthread+0x486/0x510 kernel/kthread.c:464 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x0000000000000007 -> 0x0000000000000008 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Workqueue: events_long defense_work_handler ==================================================================