Reload kills apache

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Apache's processes disappear after `apache2ctl graceful` with the following lines in errorlog:

[Sun Apr 04 17:38:25 2010] [error] (4)Interrupted system call: waitpid() failed [Sun Apr 04 17:38:25 2010] [error] (4)Interrupted system call: waitpid() failed [Sun Apr 04 17:38:25 2010] [error] (4)Interrupted system call: waitpid() failed [Sun Apr 04 17:38:25 2010] [error] (4)Interrupted system call: waitpid() failed [Sun Apr 04 17:38:25 2010] [error] (4)Interrupted system call: waitpid() failed [Sun Apr 04 17:38:25 2010] [error] (4)Interrupted system call: waitpid() failed [Sun Apr 04 17:38:25 2010] [error] (4)Interrupted system call: waitpid() failed

I have no experience in debugging so I hope to get some help here :)
What should I do to get more detailed information about the reason of fails?


# apache2 -v
Server version: Apache/2.2.9 (Debian)
Server built:   Nov 15 2009 11:32:50

# apache2 -t -D DUMP_MODULES
Loaded Modules:
core_module (static)
 log_config_module (static)
 logio_module (static)
 mpm_itk_module (static) # <- (!)
 http_module (static)
 so_module (static)
 alias_module (shared)
 auth_basic_module (shared)
 authn_file_module (shared)
 authz_default_module (shared)
 authz_groupfile_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 deflate_module (shared)
 dir_module (shared)
 env_module (shared)
 include_module (shared)
 mime_module (shared)
 negotiation_module (shared)
 php5_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)


There is a one more weird thing with Linux kernel. I use Debian Lenny, but uname shows 2.6.33 kernel.

# uname -a
Linux (hostname here) 2.6.33 #1 SMP Thu Feb 25 21:13:55 MSK 2010 x86_64 GNU/Linux

# dpkg -l | grep linux-image
ii linux-image-2.6-amd64 2.6.26+17+lenny1 Linux 2.6 image on AMD64 ii linux-image-2.6.26-2-amd64 2.6.26-21lenny4 Linux 2.6.26 image on AMD64

I think hosting company rebuilt a kernel and installed their custom one on my server so that could be the reason of waitpid() fails and a dozen of segmentation faults, but this thesis should be proven before blaming them :)

Thanks in advance.

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