Messed Response Stream

Hello everyone,
I started to use nginx about 3 month ago as a reverse proxy. I met a
serious issue days ago. Some users reported that they went into other
ones’ account pages unexpectly. After series of testing, I’m sure that
this happens in nginx side. Here are some tips of how to reproduce this
bug:

  1. The site must be under very heavy stress. Especially when there are a
    lot of 502 bad gateway happening.
  2. The requests must be from a remote position. we can not reproduce
    this bug in intranet, I guess it’s because of the network speed.
  3. Access a page that is different for different users, the issues would
    happen randomly.
    I’m sure it’s not because of proxy cache, because it only happens under
    heavy stress. And if I expose IIS directly to the users, it doesn’t
    happen anymore.
    I’m not a C/C++ programmer, but it seems to me that the memory that is
    used to store one user’s response stream is reused by another instance,
    but actually the current instance is not finished yet. This way I can
    explain why this doesn’t happen in intranet. Because it’s too fast.

Is there anyone else who encountered the same problem? Or is this bug
reported already?
Almost forget, I’m using nginx/0.7.64 on centos 5.

Regards,
Yaoxing

  1. Access a page that is different for different users, the issues would
    happen randomly.
    (…)
    I’m sure it’s not because of proxy cache

Are you saying that you’re using proxy cache to cache pages that are
different for every user? Can you show your configuration? I’m pretty
sure
that bad configuration is source of your problems.

Best regards,
Piotr S. < [email protected] >

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