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BUG: KCSAN: data-race in ext4_free_inode / find_next_zero_bit

write to 0xffff88812276c018 of 8 bytes by task 7125 on cpu 0:
 __test_and_clear_bit include/asm-generic/bitops-instrumented.h:213 [inline]
 __test_and_clear_bit_le include/asm-generic/bitops/le.h:95 [inline]
 ext4_free_inode+0x5f1/0xaa0 fs/ext4/ialloc.c:313
 ext4_evict_inode+0x9a9/0xdb0 fs/ext4/inode.c:333
 evict+0x244/0x410 fs/inode.c:571
 iput_final fs/inode.c:1560 [inline]
 iput+0x362/0x4a0 fs/inode.c:1586
 do_unlinkat+0x378/0x530 fs/namei.c:4069
 __do_sys_unlink fs/namei.c:4110 [inline]
 __se_sys_unlink fs/namei.c:4108 [inline]
 __x64_sys_unlink+0x3b/0x50 fs/namei.c:4108
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812276c018 of 8 bytes by task 7828 on cpu 1:
 _find_next_bit lib/find_bit.c:39 [inline]
 find_next_zero_bit+0x4e/0xe0 lib/find_bit.c:79
 find_next_zero_bit_le include/asm-generic/bitops/le.h:15 [inline]
 find_inode_bit.isra.0+0x82/0x300 fs/ext4/ialloc.c:715
 __ext4_new_inode+0xd4b/0x3070 fs/ext4/ialloc.c:914
 ext4_create+0x152/0x370 fs/ext4/namei.c:2587
 lookup_open fs/namei.c:3232 [inline]
 do_last fs/namei.c:3322 [inline]
 path_openat+0x29ea/0x3530 fs/namei.c:3533
 do_filp_open+0x11e/0x1b0 fs/namei.c:3563
 do_sys_open+0x3b3/0x4f0 fs/open.c:1089
 ksys_open include/linux/syscalls.h:1385 [inline]
 __do_sys_creat fs/open.c:1147 [inline]
 __se_sys_creat fs/open.c:1145 [inline]
 __x64_sys_creat+0x45/0x60 fs/open.c:1145
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7828 Comm: syz-executor.1 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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