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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 51062] New: httpd child process consumes CPU
Date Thu, 14 Apr 2011 09:23:12 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=51062

           Summary: httpd child process consumes CPU
           Product: Apache httpd-2
           Version: 2.2.15
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: KKostalkowicz@ivmx.pl


Httpd is used as a reverse proxy, load is not significantly high.

Actual behaviour: one of httpd child processes is running (for 14 hours)

Expected behaviour: all child processes should be sleeping (having run at most
several seconds)

Got two traces by attaching to the faulty process via gdb.

 * trace 1

#0  apr_bucket_free (mem=0x8fa9768) at buckets/apr_buckets_alloc.c:187
#1  0x001589c8 in apr_brigade_cleanup (data=0x8f5c3d0)
    at buckets/apr_brigade.c:44
#2  0x001589fd in brigade_cleanup (data=0x8f5c3d0) at buckets/apr_brigade.c:34
#3  0x008870ed in run_cleanups (cref=0x8f5b230) at memory/unix/apr_pools.c:2308
#4  0x00887ee7 in apr_pool_clear (pool=0x8f5b220)
    at memory/unix/apr_pools.c:737
#5  0x080aa186 in child_main (child_num_arg=<value optimized out>)
    at prefork.c:554
#6  0x080aa5f7 in make_child (s=0x8e509a8, slot=16) at prefork.c:758
#7  0x080aaf50 in ap_mpm_run (_pconf=0x8e49600, plog=0x8e856f0, s=0x8e509a8)
    at prefork.c:893
#8  0x08069aa5 in main (argc=149190136, argv=0x8f59218) at main.c:740

 * trace 2

#0  0x001589b6 in apr_brigade_cleanup (data=0x8f5c3d0)
    at buckets/apr_brigade.c:44
#1  0x001589fd in brigade_cleanup (data=0x8f5c3d0) at buckets/apr_brigade.c:34
#2  0x008870ed in run_cleanups (cref=0x8f5b230) at memory/unix/apr_pools.c:2308
#3  0x00887ee7 in apr_pool_clear (pool=0x8f5b220)
    at memory/unix/apr_pools.c:737
#4  0x080aa186 in child_main (child_num_arg=<value optimized out>)
    at prefork.c:554
#5  0x080aa5f7 in make_child (s=0x8e509a8, slot=16) at prefork.c:758
#6  0x080aaf50 in ap_mpm_run (_pconf=0x8e49600, plog=0x8e856f0, s=0x8e509a8)
    at prefork.c:893
#7  0x08069aa5 in main (argc=149190136, argv=0x8f59218) at main.c:740

 * conclusion

Process got stuck in brigade_cleanup(), continually invoking
apr_brigade_cleanup()

Possibly related issues: 46785, 50335, 34288.

I can provide more output from gdb, just give me the input.

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