06-11-2007
There are few possible reasons.... Make sure the root partition isn't running out of space, make sure the file is not "world-writable" i.e. rw-rw-rw /etc/utmp. I've heard of solutions when you "zero" the files, reboot and hope to work, although I haven't done it myself.
What actions have been done prior to system reboot ? Hardware maintanence, abnormal interruption of "shutdown -r" || reboot ?
Did you try grepping for erros at the log files, and also, what is the OS ?
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LOGIN(3) Linux Programmer's Manual LOGIN(3)
NAME
login, logout - write utmp and wtmp entries
SYNOPSIS
#include <utmp.h>
void login(const struct utmp *ut);
int logout(const char *ut_line);
Link with -lutil.
DESCRIPTION
The utmp file records who is currently using the system. The wtmp file records all logins and logouts. See utmp(5).
The function login() takes the supplied struct utmp, ut, and writes it to both the utmp and the wtmp file.
The function logout() clears the entry in the utmp file again.
GNU Details
More precisely, login() takes the argument ut struct, fills the field ut->ut_type (if there is such a field) with the value USER_PROCESS,
and fills the field ut->ut_pid (if there is such a field) with the process ID of the calling process. Then it tries to fill the field
ut->ut_line. It takes the first of stdin, stdout, stderr that is a tty, and stores the corresponding pathname minus a possible leading
/dev/ into this field, and then writes the struct to the utmp file. On the other hand, if no tty name was found, this field is filled with
"???" and the struct is not written to the utmp file. After this, the struct is written to the wtmp file.
The logout() function searches the utmp file for an entry matching the ut_line argument. If a record is found, it is updated by zeroing
out the ut_name and ut_host fields, updating the ut_tv timestamp field and setting ut_type (if there is such a field) to DEAD_PROCESS.
RETURN VALUE
The logout() function returns 1 if the entry was successfully written to the database, or 0 if an error occurred.
FILES
/var/run/utmp
user accounting database, configured through _PATH_UTMP in <paths.h>
/var/log/wtmp
user accounting log file, configured through _PATH_WTMP in <paths.h>
CONFORMING TO
Not in POSIX.1-2001. Present on the BSDs.
NOTES
Note that the member ut_user of struct utmp is called ut_name in BSD. Therefore, ut_name is defined as an alias for ut_user in <utmp.h>.
SEE ALSO
getutent(3), utmp(5)
COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
2004-05-06 LOGIN(3)