syzbot

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BUG: KCSAN: data-race in __test_and_clear_bit_le / _find_next_bit

read-write to 0xffff888237c70090 of 8 bytes by task 1820 on cpu 1:
 instrument_read_write include/linux/instrumented.h:57 [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+0x2f/0x40 include/asm-generic/bitops/le.h:61
 ext4_free_inode+0x3e3/0x810 fs/ext4/ialloc.c:316
 ext4_evict_inode+0xc2b/0xe90 fs/ext4/inode.c:331
 evict+0x1aa/0x410 fs/inode.c:665
 iput_final fs/inode.c:1748 [inline]
 iput+0x3f9/0x580 fs/inode.c:1774
 d_delete_notify include/linux/fsnotify.h:261 [inline]
 vfs_rmdir+0x270/0x2f0 fs/namei.c:4111
 do_rmdir+0x178/0x300 fs/namei.c:4159
 __do_sys_unlinkat fs/namei.c:4339 [inline]
 __se_sys_unlinkat fs/namei.c:4333 [inline]
 __x64_sys_unlinkat+0xa0/0xb0 fs/namei.c:4333
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888237c70090 of 8 bytes by task 1824 on cpu 0:
 _find_next_bit+0xe0/0x190 lib/find_bit.c:60
 find_next_zero_bit include/linux/find.h:102 [inline]
 find_next_zero_bit_le include/linux/find.h:218 [inline]
 find_inode_bit+0xc8/0x330 fs/ext4/ialloc.c:725
 __ext4_new_inode+0xc82/0x2700 fs/ext4/ialloc.c:1066
 ext4_mkdir+0x287/0x760 fs/ext4/namei.c:2979
 vfs_mkdir+0x27a/0x380 fs/namei.c:4013
 do_mkdirat+0x101/0x270 fs/namei.c:4038
 __do_sys_mkdirat fs/namei.c:4053 [inline]
 __se_sys_mkdirat fs/namei.c:4051 [inline]
 __x64_sys_mkdirat+0x4c/0x60 fs/namei.c:4051
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000033019 -> 0x000000000003300b

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1824 Comm: syz-executor.2 Not tainted 6.0.0-rc7-syzkaller-00220-gffb4d94b4314-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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