"Albert D. Cahalan" wrote: > > The 'D' means that the process is running uninterruptable kernel > code that should never take long to execute. Usually it means > the process is doing disk IO. > > To find where process 613 is stuck, do this: > > ps -p 613 -o comm,stat,f,pcpu,nwchan,wchan 361 pts/1 D 0:00 /bin/ls --color=auto -F -b -T 0 t77@darkstar:~$ ps -p 361 -o comm,stat,f,pcpu,nwchan,wchan COMMAND STAT F %CPU WCHAN WCHAN ls D 000 0.0 107951 down ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no idea... :p since i am a newbie, is there anyway of killing such a process? root@darkstar:~# umount /mnt/cdrom1 umount: /mnt/cdrom1: device is busy root@darkstar:~# umount -f /mnt/cdrom1 umount2: Device or resource busy umount: /mnt/cdrom1: device is busy After playing around with ls ,i found that acutally executing /bin/ls is ok, only because of the default alias of ls is alias ls='/bin/ls $LS_OPTIONS' then ls will crash...and thus make the cdrom useless. When ls /mnt/cdrom , from a virtual terminal there are extended kernel error messages which i don't know howto copy the error message into memory or save it into a file. Where if i 'ls /mnt/cdrom' from a gnome-terminal the error message is just Segmentation fault. from /var/log/syslog after "ls /mnt/cdrom" Nov 19 19:46:47 darkstar kernel: Unable to handle kernel paging request at virtual address dfdfdfc4 Nov 19 19:46:47 darkstar kernel: *pde = 00000000 Unable to handle kernel paging request at virtual address dfdfdfc4 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<c486d5a7>] EFLAGS: 00010202 ............rest went off the screen i've tried "ls >~/tmp/err.out" , it didn't work just a 0byte file. hmmm, ok here it's in dmesg|less Unable to handle kernel paging request at virtual address dfdfdfc4 printing eip: c486d5a7 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<c486d5a7>] EFLAGS: 00010202 eax: dfdfdf00 ebx: c2976960 ecx: c1ddb800 edx: c23f5c00 esi: c1ddb800 edi: c1ddb821 ebp: c233fba0 esp: c15b9eb0 ds: 0018 es: 0018 ss: 0018 Process ls (pid: 229, stackpage=c15b9000) Stack: c2976960 c486a2bf c1ddb800 c2976960 c27f8000 c10a9df0 c1b3d140 c2976960 c1b3d140 00000001 c01e1818 00000022 00000022 00000000 0b976960 00000800 22994000 c486a3dd c2976960 c1b3d140 c27f8000 c27f8400 fffffff4 c1b3d140 Call Trace: [<c486a2bf>] [<c486a3dd>] [<c013502b>] [<c0135788>] [<c0134dc7>] [<c0135d90>] [<c0132a26>] [<c0108daf>] Code: 8b 90 c4 00 00 00 80 b8 b4 00 00 00 00 74 1e 68 00 10 00 00 lines 76-116/116 (END) thank you for reply, - Regards, Vincent <[EMAIL PROTECTED]> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/