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Posted to bugs@httpd.apache.org by bu...@apache.org on 2013/05/18 00:03:48 UTC
[Bug 54989] New: Apache Segfaults on OS X at random - how can I
diagnose?
https://issues.apache.org/bugzilla/show_bug.cgi?id=54989
Bug ID: 54989
Summary: Apache Segfaults on OS X at random - how can I
diagnose?
Product: Apache httpd-2
Version: 2.2.22
Hardware: Macintosh
Status: NEW
Severity: normal
Priority: P2
Component: mpm_prefork
Assignee: bugs@httpd.apache.org
Reporter: ryan@rbftpnetworks.com
Classification: Unclassified
We have been having intermittent Apache crashes on OS X 10.7.5 (Lion Server).
These crashes seem to happen at random and we've tried everything to find the
cause.
We started noticing them more when we changed was MaxRequestsPerChild to 10 to
stop memleaks on some scripts we are running. We noticed that the crashes seem
to happen when the children are coming to the end of their life and have served
their 10 requests.
We also notice the segfaults come in waves. For example, we won't notice any
for three hours and the all of a sudden they happen every minute for 10 faults
and then go quiet again (possible somebody running a vulnerability scanner).
The problem may be with PHP or Apache itself. We have also noticed the same
crashes with XCache/APC disabled.
The crashes seem to always be on "Thread 1" which is kernel/OS side of things
most of the time - e.g.:
Thread 1 Crashed:
0 libsystem_kernel.dylib 0x00007fff910eb192
__workq_kernreturn + 10
1 libsystem_c.dylib 0x00007fff8fe96594
_pthread_wqthread + 758
2 libsystem_c.dylib 0x00007fff8fe97b85
start_wqthread + 13
Any help, suggestions, tips or bug fixed are very greatly appreciated.
Although, please do not suggest upgrading PHP/Apache or OS X - we need a fix
for the system in its current state; we're not in a position to
upgrade/recompile anything on such a live server so feel free to let us know of
patches or fixes (band-aids!) either on the OS side or Apache side.
We would love help in finding the cause or what page request creates the crash
(however we can't use mod_whatkilledus because we haven't compiled with
exception hooks.
Any suggested Apache modules and debugging tools are greatly appreciated.
Our crash report:
<pre>
Process: httpd [52830]
Path: /usr/sbin/httpd
Identifier: httpd
Version: ??? (???)
Code Type: X86-64 (Native)
Parent Process: httpd [86996]
Date/Time: 2013-05-15 09:39:36.067 +0100
OS Version: Mac OS X Server 10.7.5 (11G63)
Report Version: 9
Crashed Thread: 1 Dispatch queue: com.apple.libdispatch-manager
Exception Type: EXC_CRASH (SIGSEGV)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
objc[86996]: garbage collection is OFF
Thread 0:: Dispatch queue: com.apple.main-thread
0 libphp5.so 0x0000000103dbd7e2
_zend_hash_add_or_update + 75
1 libphp5.so 0x0000000103d6f5ad
zend_symtable_update + 208
2 libphp5.so 0x0000000103d7047b
php_register_variable_ex + 1584
3 libphp5.so 0x0000000103b5311d php_sapi_filter
+ 964
4 libphp5.so 0x0000000103d6a462 sapi_getenv + 99
5 libphp5.so 0x0000000103d74a7d php_security_log
+ 193
6 libphp5.so 0x0000000103dcccd2
_zend_mm_free_canary_int + 110
7 libphp5.so 0x0000000103d9786e _efree + 52
8 libphp5.so 0x0000000103db07b8 _zval_dtor_func
+ 56
9 libphp5.so 0x0000000103daa6ce destroy_op_array
+ 181
10 libphp5.so 0x0000000103dbc712
zend_hash_destroy + 53
11 libphp5.so 0x0000000103daa849
destroy_zend_class + 100
12 libphp5.so 0x0000000103dbc464
zend_hash_apply_deleter + 189
13 libphp5.so 0x0000000103dbc50f
zend_hash_reverse_apply + 102
14 libphp5.so 0x0000000103da8dd2
shutdown_executor + 650
15 libphp5.so 0x0000000103db1963 zend_deactivate
+ 99
16 libphp5.so 0x0000000103d61a4d
php_request_shutdown + 583
17 libphp5.so 0x0000000103e2a5d4 php_handler +
1186
18 httpd 0x0000000103755031 ap_run_handler +
97
19 httpd 0x0000000103755bd6
ap_invoke_handler + 422
20 httpd 0x0000000103791616
ap_internal_redirect + 118
21 mod_rewrite.so 0x0000000103a5dc70 handler_redirect
+ 256
22 httpd 0x0000000103755031 ap_run_handler +
97
23 httpd 0x0000000103755bd6
ap_invoke_handler + 422
24 httpd 0x00000001037909cd
ap_process_request + 125
25 httpd 0x000000010378c5c3
ap_process_http_connection + 131
26 httpd 0x000000010376c651
ap_run_process_connection + 97
27 httpd 0x000000010376cc31
ap_process_connection + 113
28 httpd 0x0000000103799c73 child_main +
1699
29 httpd 0x0000000103799eb3 make_child + 435
30 httpd 0x000000010379a23f
perform_idle_server_maintenance + 703
31 httpd 0x000000010379a96c ap_mpm_run +
1740
32 httpd 0x0000000103760077 main + 4055
33 httpd 0x0000000103754374 start + 52
Thread 1 Crashed:: Dispatch queue: com.apple.libdispatch-manager
0 libsystem_kernel.dylib 0x00007fff8e2557e6 kevent + 10
1 libdispatch.dylib 0x00007fff89870786
_dispatch_mgr_invoke + 923
2 libdispatch.dylib 0x00007fff8986f316
_dispatch_mgr_thread + 54
Thread 1 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000004 rbx: 0x00007fff763a31a0 rcx: 0x00000001432cb528
rdx: 0x0000000000000000
rdi: 0x000000000000001b rsi: 0x0000000000000000 rbp: 0x00000001432cb6a0
rsp: 0x00000001432cb528
r8: 0x0000000000000001 r9: 0x0000000000000000 r10: 0x00000001432cb538
r11: 0xffffff80002dad60
r12: 0x00007fff763a2540 r13: 0x0000000000000000 r14: 0x00007fff763a3230
r15: 0x0000000000000000
rip: 0x00007fff8e2557e6 rfl: 0x0000000000000247 cr2: 0x00007fff763a4310
Logical CPU: 0
External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 4267
thread_create: 0
thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=143.3M resident=54.1M(38%)
swapped_out_or_unallocated=89.2M(62%)
Writable regions: Total=96.9M written=30.2M(31%) resident=36.1M(37%)
swapped_out=0K(0%) unallocated=60.9M(63%)
REGION TYPE VIRTUAL
=========== =======
MALLOC 86.3M
MALLOC guard page 48K
STACK GUARD 56.0M
Stack 8712K
VM_ALLOCATE 688K
__CI_BITMAP 80K
__DATA 10.9M
__LINKEDIT 51.0M
__TEXT 92.3M
__UNICODE 544K
mapped file 1.0G
shared memory 12K
=========== =======
TOTAL 1.3G
</pre>
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[Bug 54989] Apache Segfaults on OS X at random - how can I diagnose?
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=54989
Ryan Barclay <ry...@rbftpnetworks.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
OS| |Mac OS X 10.6
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[Bug 54989] Apache Segfaults on OS X at random - how can I diagnose?
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=54989
Ryan Barclay <ry...@rbftpnetworks.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|mpm_prefork |Core
OS| |All
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