From: [EMAIL PROTECTED]
Operating system: Linux
PHP version: 4.0.6
PHP Bug Type: Scripting Engine problem
Bug description: Consistent Apache crash on 22nd request in Zend Optimiser
The apache module with optimiser enabled, and which up to now hasn't been
crashing, now does so reproducably. A b/t is below although maybe not a lot
to go on I'm afraid, but the events around the crash are *very
significant*. The point of failure is always the same, and after starting a
single apache process with -X, was always crashing on the 22nd request. A
*most significant* thing is that adding effectively a dummy line of code,
e.g. $x = true; changed the period of crashing from being the 22nd time to
always the 16th time. Adding a second line the crashing stopped. Note that
once determined, the crash interval is ALWAYS the same for a given state of
my application.
Clearly this is a serious, although in the general case possibly rare,
problem, and probably one of those bugs that only emmerges for a very
specific set of circumstances. I'll happily arrange access to my machine
for an official developer to help diagnose this now, but I'll take a
snapshot of my DB, code base and shared memory anyway for a chance of
future analysis.
Clearly something to focus on is why the crash would always occur after:
1) a specific number of apache requests, and
2) this number depends on the code structure.
For the trace below, assuming that the zend_file_handle structures being
passed are already initialised, then they're corrupt with bogus fd's and
file file names for example. As an aside, I did a purify run on Solaris
and there are a significant number UMR instances, which whilst not always
indicative of a problem, typically are, and so I suspect some fundamental
memory problems that one typically 'gets away with'. I'll look at this more
next week.
Anyway, the trace is:
(gdb) where
#0 0x80f5b39 in php_if_array_reduce (ht=3, return_value=0x8279dc4,
this_ptr=0x0, return_value_used=1) at array.c:2886
#1 0x40253f84 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#2 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#3 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#4 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#5 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#6 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#7 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#8 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#9 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#10 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#11 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#12 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#13 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#14 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#15 0x40254183 in zend_reverse_table () from
/usr/local/Zend/lib/ZendOptimizer.so
#16 0x4025f01d in zstd__mhm () from /usr/local/Zend/lib/ZendOptimizer.so
#17 0x80dde0b in zend_execute_scripts (type=8, file_count=3) at
zend.c:752
#18 0x806a6fb in php_execute_script (primary_file=0xbffff768) at
main.c:1206
#19 0x80eaa1b in apache_php_module_main (r=0x8246a2c,
display_source_mode=0) at sapi_apache.c:89
#20 0x8067bee in send_php ()
#21 0x8067c36 in send_parsed_php ()
#22 0x8111609 in ap_invoke_handler ()
#23 0x8126a1f in process_request_internal ()
#24 0x8126a92 in ap_process_request ()
#25 0x811d8a6 in child_main ()
#26 0x811da85 in make_child ()
---Type <return> to continue, or q <return> to quit---
#27 0x811dc06 in startup_children ()
#28 0x811e27d in standalone_main ()
#29 0x811eacc in main ()
#30 0x400c4a5e in __libc_start_main () at
../sysdeps/generic/libc-start.c:93
(gdb)
Nick
--
Edit bug report at: http://bugs.php.net/?id=12569&edit=1
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