==================================================================
BUG: KCSAN: data-race in ext4_mark_iloc_dirty / find_inode_bit

write to 0xffff88811fcc3714 of 4 bytes by task 8945 on cpu 1:
 ext4_do_update_inode fs/ext4/inode.c:5012 [inline]
 ext4_mark_iloc_dirty+0x71c/0x1630 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x2b9/0x3f0 fs/ext4/inode.c:5818
 ext4_ext_tree_init+0x7e/0x90 fs/ext4/extents.c:834
 __ext4_new_inode+0x292e/0x2f60 fs/ext4/ialloc.c:1184
 ext4_mkdir+0x289/0xc00 fs/ext4/namei.c:2792
 vfs_mkdir+0x288/0x370 fs/namei.c:3641
 do_mkdirat+0x132/0x220 fs/namei.c:3664
 __do_sys_mkdir fs/namei.c:3680 [inline]
 __se_sys_mkdir fs/namei.c:3678 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3678
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88811fcc3714 of 4 bytes by task 12960 on cpu 0:
 recently_deleted fs/ext4/ialloc.c:698 [inline]
 find_inode_bit+0x219/0x380 fs/ext4/ialloc.c:724
 __ext4_new_inode+0xc24/0x2f60 fs/ext4/ialloc.c:927
 ext4_create+0x16b/0x2d0 fs/ext4/namei.c:2616
 lookup_open fs/namei.c:3095 [inline]
 open_last_lookups fs/namei.c:3169 [inline]
 path_openat+0xcad/0x20e0 fs/namei.c:3357
 do_filp_open+0xbd/0x1d0 fs/namei.c:3387
 do_sys_openat2+0x33c/0x4a0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 ksys_open include/linux/syscalls.h:1388 [inline]
 __do_sys_creat fs/open.c:1263 [inline]
 __se_sys_creat fs/open.c:1261 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1261
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12960 Comm: syz-executor.5 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================