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BUG: KCSAN: data-race in ext4_mark_iloc_dirty / find_inode_bit

write to 0xffff8880aaae4914 of 4 bytes by task 24496 on cpu 1:
 ext4_do_update_inode fs/ext4/inode.c:5012 [inline]
 ext4_mark_iloc_dirty+0x73b/0x1660 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x448/0x630 fs/ext4/inode.c:5818
 ext4_ext_tree_init+0x7e/0x90 fs/ext4/extents.c:834
 __ext4_new_inode+0x2990/0x2fc0 fs/ext4/ialloc.c:1184
 ext4_symlink+0x354/0x7e0 fs/ext4/namei.c:3303
 vfs_symlink+0x218/0x2f0 fs/namei.c:3953
 do_symlinkat+0xee/0x280 fs/namei.c:3980
 __do_sys_symlink fs/namei.c:3999 [inline]
 __se_sys_symlink fs/namei.c:3997 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:3997
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880aaae4914 of 4 bytes by task 24500 on cpu 0:
 recently_deleted fs/ext4/ialloc.c:698 [inline]
 find_inode_bit+0x227/0x3a0 fs/ext4/ialloc.c:724
 __ext4_new_inode+0xc84/0x2fc0 fs/ext4/ialloc.c:927
 ext4_symlink+0x354/0x7e0 fs/ext4/namei.c:3303
 vfs_symlink+0x218/0x2f0 fs/namei.c:3953
 do_symlinkat+0xee/0x280 fs/namei.c:3980
 __do_sys_symlink fs/namei.c:3999 [inline]
 __se_sys_symlink fs/namei.c:3997 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:3997
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24500 Comm: syz-executor.1 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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