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Bug #1265

closed

SSL + file upload = lots of memory

Added by mlcreech over 17 years ago. Updated over 8 years ago.

Status:
Fixed
Priority:
Normal
Category:
core
Target version:
1.4.40
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Description

I'm using lighttpd (1.4.15) in an embedded device, and attempting to upload a file (~6MB). Without SSL enabled, lighttpd doesn't use much more than 6-7MB (lighttpd process grows by <1MB, ~6MB are written to /tmp). With SSL enabled, lighttpd's memory usage quickly jumps to over 26MB (lighttpd process grows to 20+MB, ~6MB are written to /tmp), exhausting all available memory and bringing the device to a grinding halt.

I also noticed that the <1MB of extra size on a non-SSL upload goes away once the upload is complete; in contrast, if I upload a smaller file (900kB) via SSL, the process size grows by ~7MB and stays that large, even after the connection is closed. However, uploading a similarly-sized file again does not cause it to grow any larger, i.e. the memory doesn't seem to be permanently leaked.

I found this ticket:

http://trac.lighttpd.net/trac/ticket/881

which sounds somewhat similar, but no additional information was ever posted about a potential cause. Any ideas? Thanks!

Files

04-limit-ssl-mem.patch (1.14 KB) 04-limit-ssl-mem.patch File which fixes this on my system (though it's probably not a "proper" fix) mlcreech, 2007-07-25 17:43

Related issues 2 (0 open — 2 closed)

Related to Bug #881: memory usage when ssl.engine used and large data uploaded through CGIFixedActions
Related to Bug #949: fastcgi, cgi, flush, php5 problem.FixedActions
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 #1

Updated by Anonymous almost 17 years ago

Someone should remove the Propaganda: najdyh-najd-al7oob43.gif

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 #2

Updated by Anonymous over 16 years ago

I have exactly the same problem.
Though, I'm not entirely sure that it's really a bug - if it is, is there going to be a fix for this?

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 #3

Updated by stbuehler over 16 years ago

  • Status changed from New to Fixed
  • Resolution set to wontfix

I don't think we want this patch upstream (i don't think it will perform well), but you may use it for embedded systems of course to safe a little bit memory.

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 #4

Updated by stbuehler about 16 years ago

  • Status changed from Fixed to Wontfix
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 #5

Updated by gstrauss over 8 years ago

  • Related to Bug #881: memory usage when ssl.engine used and large data uploaded through CGI added
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 #6

Updated by gstrauss over 8 years ago

  • Related to Bug #949: fastcgi, cgi, flush, php5 problem. added
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 #7

Updated by gstrauss over 8 years ago

  • Description updated (diff)
  • Status changed from Wontfix to Patch Pending
  • Target version changed from 1.5.0 to 1.4.40

New: asynchronous, bidirectional streaming support for request and response
Submitted pull request: https://github.com/lighttpd/lighttpd1.4/pull/66

included in the pull request are flags to openssl (SSL_MODE_RELEASE_BUFFERS) to release memory buffers when finished with them, instead of holding onto the buffers.

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 #8

Updated by gstrauss over 8 years ago

  • Status changed from Patch Pending to Fixed
  • % Done changed from 0 to 100
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