[Bug 194607] New: Unable to change passwd upon a hard reboot

bugzilla-daemon
2017-02-16T15:00:35Z

https://bugzilla.kernel.org/show_bug.cgi?id=194607

Bug ID: 194607
Summary: Unable to change passwd upon a hard reboot
Product: File System
Version: 2.5
Kernel Version: 3.18.29
Hardware: ARM
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: fs_ext4@kernel-bugs.osdl.org
Reporter: ramanareddy1892@gmail.com
Regression: No

Hi,

I have an imx6dl based custom board. I compiled OpenWRT Chaos Calmer for this
and generated an image out of u-boot.img, zImage and dtb file in one partition
and rootfs in second partition. First partition is vfat and second(rootfs) is
ext4.

The board can boot from SD card and internal eMMC flash. I tried on both of
them.

Steps to reproduce:

1. Boot the image.
2. Change passwd to a non-empty string
3. Observe there is no passwd+ file in the /etc/ directory
4. Do a hard reboot (Soft reboot doesn't reproduce this)
5. Observe that passwd+ file exists in /etc/ directory. (Happens more than 80%
of the time)
6. Now unless we remove this file, passwd cannot be changed.

root@OpenWRT:~# passwd
Changing password for root
New password:
Bad password: too short
Retype password:
passwd: can't create '/etc/passwd+': File exists
passwd: can't update password file /etc/passwd

This cannot be a busybox issue. The problem comes because passwd+ file recovers
after it got deleted upon reboot!!

I will upload the required logs/docs/info if specified.

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