Reboot didn't resolve the issue. I will have to open a ticket with redhat.
hopefully they can figure this out
Gregory
2017-04-18 23:31 GMT-04:00 Grzegorz Powiedziuk <gpowiedz...@gmail.com>:
> 2017-04-18 16:34 GMT-04:00 Alan Altmark <alan_altm...@us.ibm.com>:
>
>> On Monday, 04/17/2017 at 03:14 GMT, Grzegorz Powiedziuk
>> <gpowiedz...@gmail.com> wrote:
>> > I am having a really weird issue on one of the z redhat systems.
>> Probably
>> > it doesn't have anything to do with Z but we have some great minds here
>> so
>> > perhaps someone will help me
>> >
>> > the "df -h" or "df -P" command doesn't work when run as a normal user.
>> > "df" on it's own works fine.
>> >
>> > Error:
>> > df: cannot read table of mounted file systems: Permission denied
>> >
>> > Now, here is when it gets really strange. Above suggests wrong
>> permissions
>> > on /etc/mtab which are fine:
>> > [root@it069qz5ora lib64]# ls -la /etc/mtab
>> > -rw-r--r-- 1 root root 2024 Apr 17 10:44 /etc/mtab
>> >
>> > But the "df -h" is trying to open that file with WRITE access mode !!!
>> > strace df -h 2>&1 |grep open | grep mtab
>> > ...
>> > open("/etc/mtab", O*_RDWR*|O_CLOEXEC) = -1 EACCES (Permission
>> denied)
>> >
>> > On all other systems"df -h" opens that mtab file in O_RDONLY. Why this
>> one
>> > is different?
>> >
>> > And as I said, regular "df" works fine and it usies O_RDONLY flag.
>> >
>> > So the problem happens only with "df -h" or "df -P" . That doesn't make
>> any
>> > sense to me.
>> >
>> > Has anyone seen anything like that?
>>
>> Weird. The read_file_system_list() routine in mountlist.c (called by
>> df.c) code shows a hard-coded "r" option in the fopen(), and I don't see
>> df calling some other "mount list" function because of -h or -P.
>>
>> Alan Altmark
>>
>
>
> I know .. doesn't make sense. Thanks for looking into source code. I
> wonder if something has change in the code in the
> newer versions of this package. Tomorrow in the evening I will reboot this
> guy. Hopefully this will fix it.
>
> Aha, forgot to say. I've changed permissions of mtab file to 666 for a
> moment just to make sure that this is the problem and of course it worked
> this time.
>
> Gregory
>
>
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