Go Back   FlashFXP Forums > > > >

ioFTPD General New releases, comments, questions regarding the latest version of ioFTPD.

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-27-2007, 06:32 AM   #1
Yil
Too much time...
FlashFXP Beta Tester
ioFTPD Administrator
 
Join Date: May 2005
Posts: 1,194
Default 4k bug info

I'm looking for any info on how to reproduce the 4k .ioFTPD bug. I'm running 5.8.4 which should have it.

I've got a directory of 300ish files and two logins each doing a chmod or chown on all the files while a third login randomly deletes a file or two and enters/leaves the directory. No immediate luck.

Hard to fix it (if it even exists in the sourceforge code) if I can't reproduce it... So let me know under what situations/configurations you've seen the problem. In particular has anyone had a directory corrupted using plain ioFTPD, or does it require a zipscript that is adding/creating files outside of ioFTPD. Do you only notice the problem the next time you start ioFTPD? Did it shut down incorrectly right before that?

Thanks.
Yil is offline   Reply With Quote
Old 02-27-2007, 07:26 AM   #2
jeza
Senior Member
ioFTPD Scripter
 
jeza's Avatar
 
Join Date: May 2003
Posts: 530
Default

i think problem was by tuffs zipscript, iosfv is writing race info to .ioftpd files i think

*** edit by tuff: you should know better :P ***

Last edited by tuff; 03-06-2007 at 02:05 PM.
jeza is offline   Reply With Quote
Old 02-28-2007, 04:50 AM   #3
EwarWoo
Senior Member
FlashFXP Registered User
ioFTPD Registered User
 
Join Date: Oct 2002
Posts: 462
Default

Quote:
Originally Posted by jeza View Post
i think problem was by tuffs zipscript, iosfv is writing race info to .ioftpd files i think
Nope, otherwise people would have just avoided his zipscript

Can't say what causes it but it occurs on lotsa different setups.

My usual base setup is ioFTPD, ioA, dzsbot, php_psio, newdir, sitewho, sC, nxIoFileCheck.

nxIoFileCheck definately isn't the cause, it's a work around to get past the issue and I *think* it ocurred before I started using sC.

If any of the people who went with purely nx scripts have the issue that will rule out all of the above.

Not really noticed anything about when it occurs, and it's usually noticed when the site starts random crashing which is eventually narrowed down to occurring when someone enters a particular dir (or at least, that was the case before the nxIoFileCheck script, now it's often picked up before it's noticed).

And from what I remember said of it by D1, I don't think the issue is that io files get over 4k per se, the issue is that he didn't forsee it occurring so the variable that handles io files can't deal with over 4k.

It could even be if you're working on the wrong build it's not there, panic fixed it in 5.8.6 I think, it just then had other issues.

Last edited by EwarWoo; 02-28-2007 at 05:02 AM. Reason: Added more info
EwarWoo is offline   Reply With Quote
Old 02-28-2007, 08:14 AM   #4
Yil
Too much time...
FlashFXP Beta Tester
ioFTPD Administrator
 
Join Date: May 2005
Posts: 1,194
Default Luck?

The code release on sourceforge appears to be 5.8.6+ because it "fixes" (broke differently) the user login account bug. Hopefully that means it also fixes the 4k bug. I thought early on I spotted the problem but I was wrong and going over the code I don't see anything troubling. There are almost no comments in the code so I'm guessing the fact that I see a one liner describing a semaphore used to prevent a race conditions on .ioftpd that the problem was fixed. Since I can't reproduce the bug on demand in older versions I can't prove that though...
Yil is offline   Reply With Quote
Old 02-28-2007, 11:13 AM   #5
razoor
Senior Member
ioFTPD Foundation User
 
Join Date: Oct 2006
Posts: 163
Default

yes it is fixed in 5.8.6 =)
razoor is offline   Reply With Quote
Old 02-28-2007, 01:24 PM   #6
Flow
Senior Member
FlashFXP Beta Tester
ioFTPD Foundation User
 
Flow's Avatar
 
Join Date: Dec 2001
Posts: 306
Default

Hi Yil, can you please take a look at the sharemem thingy?, so sitewho script works for sitebots ? I think sharemem is broken in 5.8.8r
Flow is offline   Reply With Quote
Old 03-06-2007, 02:04 PM   #7
tuff
Senior Member
FlashFXP Registered User
ioFTPD Scripter
 
Join Date: Jan 2003
Posts: 277
Default

iosfv has nothing to do with this bug!

iosfv simply uses the .ioftpd file to store its info, and since this is how iosfv works, its how i actually discovered the bug in the first place, d1 has already moved on to the next version rewrite when i had passed along the bug/.ioftpd files for him to look at.

the bug will crash ioftpd on the next run of ioftpd.exe when its attempting to cache .ioftpd files when you first logon, and there are .ioftpd files over 4k
__________________
#iotools #ioftpd (both on efnet)
tuff is offline   Reply With Quote
Old 03-28-2007, 03:51 AM   #8
Zer0Racer
Senior Member
ioFTPD Scripter
 
Join Date: Oct 2002
Posts: 703
Default

What happens if ioftpd has to cache a dir containing thousands and thousands of files/subdirs and with special permissions/ownership for many of them? It gets stored in .ioftpd file? Wouldn't that make the .ioftpd file bigger than 4k?

I think a friend of mine has a file structure like that and .ioftpd files up to 8k in size, but no crashes. At least not on dir listing. Maybe because it's already cached and io not restarted?

/ZR
Zer0Racer is offline   Reply With Quote
Old 03-28-2007, 07:45 AM   #9
tuff
Senior Member
FlashFXP Registered User
ioFTPD Scripter
 
Join Date: Jan 2003
Posts: 277
Default

as soon as io is restarted itll crash, this crash can be easily recreated, if you upload say 90 50meg files, with a decent length filename, your .ioftpd file will soon grow to over 4k and thats without any scripts installed
__________________
#iotools #ioftpd (both on efnet)
tuff is offline   Reply With Quote
Old 03-28-2007, 02:13 PM   #10
Zer0Racer
Senior Member
ioFTPD Scripter
 
Join Date: Oct 2002
Posts: 703
Default

Ah okay. Uhm, for which version? My 585r has .ioftpd files over 4k in a couple of places but I've (to my knowledge) never had a crash because of it, and I restart my comp regularly.

/ZR
Zer0Racer is offline   Reply With Quote
Old 03-29-2007, 10:45 AM   #11
tuff
Senior Member
FlashFXP Registered User
ioFTPD Scripter
 
Join Date: Jan 2003
Posts: 277
Default

585 was the last effected version
__________________
#iotools #ioftpd (both on efnet)
tuff is offline   Reply With Quote
Old 03-29-2007, 12:16 PM   #12
Yil
Too much time...
FlashFXP Beta Tester
ioFTPD Administrator
 
Join Date: May 2005
Posts: 1,194
Default

I think the code base released on sourceforge has the 4k bug fixed and therefore I don't know what it looked like previously so this is pure guesswork...

ioFTPD creates 4k of data for the .ioFTPD file and writes it out, then produces the next 4k, etc. If you don't do anything fast then the non-interlocked update that previously existed (guess) would complete and work fine. Thus a single user or lightly used server where nobody was in the same directory updating stuff at the same time might be able to survive and create larger .ioFTPD files. As with all race conditions it's luck on whether you get a corruption or not as you would need two writes to the .ioFTPD file to be going on at the same time with different data...

I know for a fact that I've created 16k .ioFTPD on 584u and couldn't get it to crash so it's not just size that is the problem so I assume it's the race condition writing.

P.S. I'm down to my last feature before releasing v6.0 My changelog includes 30+ new commands/features and I think you will all be very happy!
Yil is offline   Reply With Quote
Old 03-30-2007, 03:03 AM   #13
Zer0Racer
Senior Member
ioFTPD Scripter
 
Join Date: Oct 2002
Posts: 703
Default

Looking forward to it! Nice to finally see progress that adds up to an actual release. Hopefully working release. I'm still on 585r since the newer builds just created problems for me.

/ZR
Zer0Racer is offline   Reply With Quote
Reply

Tags
directory, files, ioftpd, problem, reproduce

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 05:03 AM.

Parts of this site powered by vBulletin Mods & Addons from DragonByte Technologies Ltd. (Details)