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

write to 0xffff888123f433f8 of 8 bytes by task 9093 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+0x610/0xaa0 fs/ext4/ialloc.c:310
 ext4_evict_inode+0x869/0xa30 fs/ext4/inode.c:314
 evict+0x238/0x3f0 fs/inode.c:576
 iput_final fs/inode.c:1572 [inline]
 iput+0x36a/0x4d0 fs/inode.c:1598
 do_unlinkat+0x388/0x550 fs/namei.c:3879
 __do_sys_unlink fs/namei.c:3920 [inline]
 __se_sys_unlink fs/namei.c:3918 [inline]
 __x64_sys_unlink+0x38/0x50 fs/namei.c:3918
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888123f433f8 of 8 bytes by task 13921 on cpu 0:
 _find_next_bit.constprop.0+0x61/0x160 lib/find_bit.c:39
 find_next_zero_bit+0x35/0x50 lib/find_bit.c:87
 find_next_zero_bit_le include/asm-generic/bitops/le.h:15 [inline]
 find_inode_bit.isra.0+0xa1/0x330 fs/ext4/ialloc.c:718
 __ext4_new_inode+0xd7b/0x3020 fs/ext4/ialloc.c:927
 ext4_create+0x240/0x300 fs/ext4/namei.c:2614
 lookup_open fs/namei.c:3081 [inline]
 open_last_lookups fs/namei.c:3155 [inline]
 path_openat+0x1f95/0x23d0 fs/namei.c:3343
 do_filp_open+0x11e/0x1b0 fs/namei.c:3373
 do_sys_openat2+0x52e/0x680 fs/open.c:1148
 do_sys_open+0xa2/0x110 fs/open.c:1164
 ksys_open include/linux/syscalls.h:1386 [inline]
 __do_sys_creat fs/open.c:1232 [inline]
 __se_sys_creat fs/open.c:1230 [inline]
 __x64_sys_creat+0x42/0x60 fs/open.c:1230
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13921 Comm: syz-executor.0 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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