syzbot

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BUG: KCSAN: data-race in __test_and_clear_bit_le / _find_next_zero_bit

read-write to 0xffff8881049f40f0 of 8 bytes by task 3110 on cpu 1:
 instrument_read_write include/linux/instrumented.h:55 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:84 [inline]
 ___test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:114 [inline]
 __test_and_clear_bit_le+0x31/0x50 include/asm-generic/bitops/le.h:61
 ext4_free_inode+0x3ec/0x810 fs/ext4/ialloc.c:316
 ext4_evict_inode+0xb1e/0xdc0 fs/ext4/inode.c:303
 evict+0x1aa/0x410 fs/inode.c:666
 iput_final fs/inode.c:1777 [inline]
 iput+0x42c/0x5b0 fs/inode.c:1803
 d_delete_notify include/linux/fsnotify.h:262 [inline]
 vfs_rmdir+0x274/0x2f0 fs/namei.c:4202
 do_rmdir+0x194/0x320 fs/namei.c:4248
 __do_sys_unlinkat fs/namei.c:4424 [inline]
 __se_sys_unlinkat fs/namei.c:4418 [inline]
 __x64_sys_unlinkat+0xa4/0xb0 fs/namei.c:4418
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff8881049f40f0 of 8 bytes by task 3106 on cpu 0:
 _find_next_zero_bit+0x94/0xf0 lib/find_bit.c:198
 find_next_zero_bit include/linux/find.h:186 [inline]
 find_next_zero_bit_le include/linux/find.h:485 [inline]
 find_inode_bit+0xae/0x320 fs/ext4/ialloc.c:724
 __ext4_new_inode+0xce0/0x2270 fs/ext4/ialloc.c:1064
 ext4_mkdir+0x27f/0x740 fs/ext4/namei.c:3016
 vfs_mkdir+0x1ef/0x2f0 fs/namei.c:4106
 do_mkdirat+0x12f/0x2a0 fs/namei.c:4129
 __do_sys_mkdirat fs/namei.c:4144 [inline]
 __se_sys_mkdirat fs/namei.c:4142 [inline]
 __x64_sys_mkdirat+0x50/0x60 fs/namei.c:4142
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000c9a607efffff -> 0x0000c9a6077fffff

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3106 Comm: syz-executor.3 Not tainted 6.7.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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