syzbot

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

write to 0xffff8881247023b0 of 8 bytes by task 9344 on cpu 0:
 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
 dentry_unlink_inode+0x272/0x2e0 fs/dcache.c:374
 d_delete fs/dcache.c:2451 [inline]
 d_delete+0xca/0xe0 fs/dcache.c:2440
 vfs_rmdir fs/namei.c:3702 [inline]
 vfs_rmdir+0x2f1/0x310 fs/namei.c:3667
 do_rmdir+0x2e9/0x320 fs/namei.c:3750
 __do_sys_rmdir fs/namei.c:3768 [inline]
 __se_sys_rmdir fs/namei.c:3766 [inline]
 __x64_sys_rmdir+0x2c/0x40 fs/namei.c:3766
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881247023b0 of 8 bytes by task 8921 on cpu 1:
 _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_mkdir+0x271/0x850 fs/ext4/namei.c:2790
 vfs_mkdir+0x281/0x3b0 fs/namei.c:3625
 do_mkdirat+0x1b5/0x200 fs/namei.c:3648
 __do_sys_mkdir fs/namei.c:3664 [inline]
 __se_sys_mkdir fs/namei.c:3662 [inline]
 __x64_sys_mkdir+0x3d/0x50 fs/namei.c:3662
 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: 1 PID: 8921 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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