Re: A 2.4.[57] kernel crypto problem
On Mon, Jan 07, 2002 at 07:59:35AM -0500, Anthony DeRobertis wrote:
>
> On Sunday, January 6, 2002, at 04:00 , Pavel Minev Penev wrote:
>
> >There are about 3304 proceses with sequential PIDs and names of
> >"[loop7 <defunct>]", and are all zombies.
>
> Are you calling fork in your code? Are you calling waitpid or friends?
No fork/clone/waitpid/pthread*/exec/etc. I don't need these. As I have
shown on the scheme I simply generate a password, configure a loop
device, read the ext2/ext3 super-block from it and test it for the
ext2/ext3 magic ID. The functions used are: open (), close (), ioctl (),
read (), malloc (), free (), printf (), fprintf ().
> Who's children are those? (try ps fxa)
`lo_bruteforce` under X, canceled before a hang-up:
$ ps fxa
[snip]
3427 ? S 0:03 konsole %i %m
3428 pts/6 S 0:00 \_ /bin/bash
3443 pts/6 S 0:00 \_ -su
13060 pts/6 R 0:01 \_ ./lo_bruteforce testdev /dev/loop7 /var/tmp/lo_bruteforce.sess
13061 ? Z< 0:00 \_ [loop7 <defunct>]
13062 ? Z< 0:00 \_ [loop7 <defunct>]
13063 ? Z< 0:00 \_ [loop7 <defunct>]
13064 ? Z< 0:00 \_ [loop7 <defunct>]
13065 ? Z< 0:00 \_ [loop7 <defunct>]
13066 ? Z< 0:00 \_ [loop7 <defunct>]
13067 ? Z< 0:00 \_ [loop7 <defunct>]
13068 ? Z< 0:00 \_ [loop7 <defunct>]
13069 ? Z< 0:00 \_ [loop7 <defunct>]
13070 ? Z< 0:00 \_ [loop7 <defunct>]
13071 ? Z< 0:00 \_ [loop7 <defunct>]
13072 ? Z< 0:00 \_ [loop7 <defunct>]
13073 ? Z< 0:00 \_ [loop7 <defunct>]
13074 ? Z< 0:00 \_ [loop7 <defunct>]
13075 ? Z< 0:00 \_ [loop7 <defunct>]
13076 ? Z< 0:00 \_ [loop7 <defunct>]
13077 ? Z< 0:00 \_ [loop7 <defunct>]
13078 ? Z< 0:00 \_ [loop7 <defunct>]
13079 ? Z< 0:00 \_ [loop7 <defunct>]
13080 ? Z< 0:00 \_ [loop7 <defunct>]
13081 ? Z< 0:00 \_ [loop7 <defunct>]
13082 ? Z< 0:00 \_ [loop7 <defunct>]
13083 ? Z< 0:00 \_ [loop7 <defunct>]
13084 ? Z< 0:00 \_ [loop7 <defunct>]
13085 ? Z< 0:00 \_ [loop7 <defunct>]
13086 ? Z< 0:00 \_ [loop7 <defunct>]
13087 ? Z< 0:00 \_ [loop7 <defunct>]
13088 ? Z< 0:00 \_ [loop7 <defunct>]
13089 ? Z< 0:00 \_ [loop7 <defunct>]
13090 ? Z< 0:00 \_ [loop7 <defunct>]
13091 ? Z< 0:00 \_ [loop7 <defunct>]
13092 ? Z< 0:00 \_ [loop7 <defunct>]
13093 ? Z< 0:00 \_ [loop7 <defunct>]
13094 ? Z< 0:00 \_ [loop7 <defunct>]
13095 ? Z< 0:00 \_ [loop7 <defunct>]
13096 ? Z< 0:00 \_ [loop7 <defunct>]
13097 ? Z< 0:00 \_ [loop7 <defunct>]
13098 ? Z< 0:00 \_ [loop7 <defunct>]
13099 ? Z< 0:00 \_ [loop7 <defunct>]
13100 ? Z< 0:00 \_ [loop7 <defunct>]
13101 ? Z< 0:00 \_ [loop7 <defunct>]
13102 ? Z< 0:00 \_ [loop7 <defunct>]
13103 ? Z< 0:00 \_ [loop7 <defunct>]
13104 ? Z< 0:00 \_ [loop7 <defunct>]
13105 ? Z< 0:00 \_ [loop7 <defunct>]
13106 ? Z< 0:00 \_ [loop7 <defunct>]
13107 ? Z< 0:00 \_ [loop7 <defunct>]
13108 ? Z< 0:00 \_ [loop7 <defunct>]
13109 ? Z< 0:00 \_ [loop7 <defunct>]
13110 ? Z< 0:00 \_ [loop7 <defunct>]
13111 ? Z< 0:00 \_ [loop7 <defunct>]
13112 ? Z< 0:00 \_ [loop7 <defunct>]
13113 ? Z< 0:00 \_ [loop7 <defunct>]
13114 ? Z< 0:00 \_ [loop7 <defunct>]
13115 ? Z< 0:00 \_ [loop7 <defunct>]
13116 ? Z< 0:00 \_ [loop7 <defunct>]
13117 ? Z< 0:00 \_ [loop7 <defunct>]
13118 ? Z< 0:00 \_ [loop7 <defunct>]
13119 ? Z< 0:00 \_ [loop7 <defunct>]
13120 ? Z< 0:00 \_ [loop7 <defunct>]
13121 ? Z< 0:00 \_ [loop7 <defunct>]
13122 ? Z< 0:00 \_ [loop7 <defunct>]
13123 ? Z< 0:00 \_ [loop7 <defunct>]
13124 ? Z< 0:00 \_ [loop7 <defunct>]
13125 ? Z< 0:00 \_ [loop7 <defunct>]
13126 ? Z< 0:00 \_ [loop7 <defunct>]
13127 ? Z< 0:00 \_ [loop7 <defunct>]
13128 ? Z< 0:00 \_ [loop7 <defunct>]
13129 ? Z< 0:00 \_ [loop7 <defunct>]
13130 ? Z< 0:00 \_ [loop7 <defunct>]
13131 ? Z< 0:00 \_ [loop7 <defunct>]
13132 ? Z< 0:00 \_ [loop7 <defunct>]
13133 ? Z< 0:00 \_ [loop7 <defunct>]
13134 ? Z< 0:00 \_ [loop7 <defunct>]
13135 ? Z< 0:00 \_ [loop7 <defunct>]
13136 ? Z< 0:00 \_ [loop7 <defunct>]
13137 ? Z< 0:00 \_ [loop7 <defunct>]
13138 ? Z< 0:00 \_ [loop7 <defunct>]
13139 ? Z< 0:00 \_ [loop7 <defunct>]
13140 ? Z< 0:00 \_ [loop7 <defunct>]
13141 ? Z< 0:00 \_ [loop7 <defunct>]
13142 ? Z< 0:00 \_ [loop7 <defunct>]
13144 ? Z< 0:00 \_ [loop7 <defunct>]
13145 ? Z< 0:00 \_ [loop7 <defunct>]
13146 ? Z< 0:00 \_ [loop7 <defunct>]
13147 ? Z< 0:00 \_ [loop7 <defunct>]
13148 pts/6 R 0:00 \_ ./lo_bruteforce testdev /dev/loop7 /var/tmp/lo_bruteforce.sess
[snip]
I don't know why process 13148 looks like the initial 13060. I guess the
hang-up is due to the kernel's inability to terminate all those
zombies, since it lacks the resources. When it hangs up the above
`ps fxa` picture appears, with only the last child
(`./lo_bruteforce testdev /dev/loop7 /var/tmp/lo_bruteforce.sess`)
missing. In addition my free RAM is 5396kB. I forgot mention before that
syslog has nothing on this issue. Also under X it seems that the
brute-forcer needs more time before it hangs up.
"/proc/sys/kernel/threads-max" contains "6655".
Thanks for the help,
--
Pav
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