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BUG: KCSAN: data-race in _find_next_bit.constprop.0 / ext4_free_inode

write to 0xffff8881218bc010 of 8 bytes by task 13421 on cpu 1:
 instrument_write include/linux/instrumented.h:42 [inline]
 __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:85 [inline]
 __test_and_clear_bit_le include/asm-generic/bitops/le.h:95 [inline]
 ext4_free_inode+0x5e5/0xa50 fs/ext4/ialloc.c:311
 ext4_evict_inode+0x871/0xa40 fs/ext4/inode.c:315
 evict+0x244/0x410 fs/inode.c:575
 iput_final fs/inode.c:1571 [inline]
 iput+0x371/0x4e0 fs/inode.c:1597
 dentry_unlink_inode+0x281/0x2f0 fs/dcache.c:374
 d_delete fs/dcache.c:2451 [inline]
 d_delete+0xdb/0xe0 fs/dcache.c:2440
 vfs_rmdir fs/namei.c:3966 [inline]
 vfs_rmdir+0x2e2/0x300 fs/namei.c:3931
 do_rmdir+0x2cb/0x300 fs/namei.c:4014
 __do_sys_rmdir fs/namei.c:4032 [inline]
 __se_sys_rmdir fs/namei.c:4030 [inline]
 __x64_sys_rmdir+0x2f/0x40 fs/namei.c:4030
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881218bc010 of 8 bytes by task 20127 on cpu 0:
 _find_next_bit.constprop.0+0x64/0x160 lib/find_bit.c:39
 find_next_zero_bit+0x38/0x50 lib/find_bit.c:87
 find_next_zero_bit_le include/asm-generic/bitops/le.h:15 [inline]
 find_inode_bit.isra.0+0x82/0x300 fs/ext4/ialloc.c:713
 __ext4_new_inode+0xd45/0x2f30 fs/ext4/ialloc.c:912
 ext4_symlink+0x31c/0x9b0 fs/ext4/namei.c:3287
 vfs_symlink fs/namei.c:4201 [inline]
 vfs_symlink+0x218/0x310 fs/namei.c:4187
 do_symlinkat+0x1a5/0x1e0 fs/namei.c:4228
 __do_sys_symlink fs/namei.c:4247 [inline]
 __se_sys_symlink fs/namei.c:4245 [inline]
 __x64_sys_symlink+0x3f/0x50 fs/namei.c:4245
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20127 Comm: syz-executor.2 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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