FTP Client API Hangs - Attached Scenario.
-----------------------------------------
Key: NET-160
URL: https://issues.apache.org/jira/browse/NET-160
Project: Commons Net
Issue Type: Bug
Affects Versions: 1.4
Environment: Suse Enterprise Linux 9.0, Intel
Reporter: Lvenkataraman
FTP client hangs with the following error. Here is the truss output. The
client hangs indefinitely and no work is being done other than this error when
you truss the process. I use Java 1.5 to run this. We wrote a long-running
ftp daemon and this happens after 20-23 hours of continuous running.
Here is the code to pull files from the ftp server. This one lists files that
are received after this particular "incal" time (currently it lists but the
intention is to implement an incremental download). We initially thought doing
periodic noop would keep the client alive by sending dummy commands to the
server. But we found this probelm still occurs.
public void ListIncrementalFiles (String directory, Calendar incal)
{
try
{
FTPFile[] files = listFiles(directory);
int total_files = 0;
System.out.println("FileName\tFileSize\t\tDate Time
Stamp");
for (int i = 0; i < files.length; i++)
{
FTPFile file = files[i];
if ((i % 1000) == 0)
{
System.out.println("noop
occurred at this instance---> " + i + "\n");
noop();
}
if (file.isFile())
{
Calendar c =
file.getTimestamp();
if (c.after(incal) ||
c.equals(incal))
{
System.out.println(file.getName() + "\t" + file.getSize() + "\t\t" +
c.getTime());
total_files++;
}
}
}
System.out.println("Total Files in the listing ----> "
+ total_files);
}
catch (Exception e)
{
System.out.println("FTP Getfiles exception occured");
e.printStackTrace();
}
}
---------------------------------------------------------------------------------------------------------------------------------Truss
output begins--------------------------------------------------------
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/6: lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/9: lwp_park(0x00000000, 0) (sleeping...)
/3: lwp_cond_wait(0x000B77C0, 0x000B77A8, 0x00000000, 0) (sleeping...)
/8: lwp_cond_wait(0x0014A908, 0x0014A8F0, 0x00000000, 0) (sleeping...)
/10: lwp_cond_wait(0x000366E8, 0x000366D0, 0x00000000, 0) (sleeping...)
/1: pollsys(0x00000000, 0, 0xFFBFEB60, 0x00000000) (sleeping...)
/11: lwp_cond_wait(0x00036778, 0x00036760, 0x00000000, 0) (sleeping...)
/4: lwp_cond_wait(0x000B77C0, 0x000B77A8, 0x00000000, 0) (sleeping...)
/12: lwp_cond_wait(0x00036778, 0x00036760, 0x00000000, 0) (sleeping...)
/2: lwp_cond_wait(0x000B77C0, 0x000B77A8, 0x00000000, 0) (sleeping...)
/7: lwp_cond_wait(0x00149F98, 0x00149F80, 0x00000000, 0) (sleeping...)
/5: lwp_cond_wait(0x000B77C0, 0x000B77A8, 0x00000000, 0) (sleeping...)
/13: lwp_cond_wait(0x00034958, 0x00034940, 0x00000000, 0) (sleeping...)
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/6: lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/6: lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/6: lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/6: lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/6: lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/6: lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
/14: pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000) = 0
------------------------------------------------------------------------------------------Truss
output
ends-------------------------------------------------------------------------------------------
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