Bug#215836: apache uses lot's of CPU and Memory
On Wed, Oct 15, 2003 at 07:45:42PM +0100, Daniel Pocock wrote:
> I still have the problem with mod_jk disabled completely and all JkMount
> directives removed.
>
> Is there some way I can debug the process that is playing up? I
> attached to it with gdb /usr/sbin/apache 18038 and each time I stop it I
> get:
>
> 0x40205ce4 in _IO_file_underflow () from /lib/libc.so.6
> (gdb) cont
> Continuing.
>
> Program received signal SIGINT, Interrupt.
> [Switching to Thread 16384 (LWP 18038)]
> 0x40205ce4 in _IO_file_underflow () from /lib/libc.so.6
> (gdb)
>
> When I continue the process, the problem is back within 15 seconds or
> so. Is there a symbol table I can use for debugging this binary, or
> will I need to recompile?
>
> (gdb) bt
> #0 0x40205ce4 in _IO_file_underflow () from /lib/libc.so.6
> #1 0x40205f65 in _IO_file_underflow () from /lib/libc.so.6
> #2 0x40207aad in _IO_default_uflow () from /lib/libc.so.6
> #3 0x402078ee in __uflow () from /lib/libc.so.6
> #4 0x401fc328 in _IO_getline_info () from /lib/libc.so.6
> #5 0x401fc223 in _IO_getline () from /lib/libc.so.6
> #6 0x40204b4b in fgets_unlocked () from /lib/libc.so.6
> #7 0x486bd008 in ?? ()
> #8 0x0fbb8fff in ?? ()
> #9 0x0000000a in ?? ()
> #10 0x00000001 in ?? ()
> (gdb)
>
>
> My httpd.conf has about 20 virtualhosts and almost everything else is
> the defaults.
>
> There is nothing unusual about any of the virtualhost definitions. All
> my sites use php. I also have squirrelmail, but the problem still
> occurs even when no one has been using squirrelmail. Eg, I just killed
> all the processes now, restarted, and the problem was back within 15
> minutes.
It's possible that it's a UML bug, an underlying library like glibc, or a
bug in Apache which is only exposed by UML (it sometimes uncovers race
conditions which are unlikely in other situations). You'll need to
experiment with it to narrow the list of possible causes and determine which
is at fault.
--
- mdz
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