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* 2.2.19 hard hang from userspace while accessing /dev/mdXX devices
@ 2000-12-28 23:59 Jeff V. Merkey
  2000-12-28 23:09 ` Alan Cox
  0 siblings, 1 reply; 3+ messages in thread
From: Jeff V. Merkey @ 2000-12-28 23:59 UTC (permalink / raw)
  To: linux-kernel; +Cc: jmerkey


Hard hand in 2.2.19

If you open a non-existant md device (i.e. /dev/md11) from userspace 
with an open() call, then send an ioctl() command, it results in the
following message then hard hangs the entire system if you attempt
to open any /dev/mdXX device with a minor number greater than 10.  
Used to work on 2.2.17.

message is:

md map 11
bap map 11 ll_rw_block
       

offending code that causes the hard hang is:


        register int fd, ccode;
        struct hd_geometry geometry;

        fd = open("/dev/md11", O_RDWR);
        if (fd < 0)
            return 1;

#ifdef HDIO_REQ
       ccode = ioctl(fd, HDIO_REQ, &geometry);
#else
       ccode = ioctl(fd, HDIO_GETGEO, &geometry);
#endif
       if ((ccode == -EINVAL) || (ccode == -ENODEV))
       {
          close(fd);
          return 1;
       }  
       close(fd)
       return 0;


Jeff

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^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2000-12-28 23:44 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2000-12-28 23:59 2.2.19 hard hang from userspace while accessing /dev/mdXX devices Jeff V. Merkey
2000-12-28 23:09 ` Alan Cox
2000-12-29  0:09   ` Jeff V. Merkey

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