[mod_cluster-issues] [JBoss JIRA] (MODCLUSTER-622) segfault in process_info
Hisanobu Okuda created MODCLUSTER-622:
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Summary: segfault in process_info
Key: MODCLUSTER-622
URL: https://issues.jboss.org/browse/MODCLUSTER-622
Project: mod_cluster
Issue Type: Bug
Components: Native (httpd modules)
Affects Versions: 1.2.13.Final
Environment: see the private comment
Reporter: Hisanobu Okuda
Assignee: Jean-Frederic Clere
Segfault occured at process_info.
{code}
(gdb) bt
#0 process_info (r=0x7f01039b7088, errtype=<value optimized out>) at
mod_manager.c:1150
#1 0x00007f00fd15b44a in manager_handler (r=0x7f01039b7088) at mod_manager.c:2705
#2 0x00007f0102927640 in ap_run_handler (r=0x7f01039b7088) at
/usr/src/debug/httpd-2.2.15/server/config.c:158
#3 0x00007f010292aefe in ap_invoke_handler (r=0x7f01039b7088) at
/usr/src/debug/httpd-2.2.15/server/config.c:376
#4 0x00007f0102936300 in ap_process_request (r=0x7f01039b7088) at
/usr/src/debug/httpd-2.2.15/modules/http/http_request.c:282
#5 0x00007f0102933178 in ap_process_http_connection (c=0x7f00f00ebba0) at
/usr/src/debug/httpd-2.2.15/modules/http/http_core.c:190
#6 0x00007f010292f148 in ap_run_process_connection (c=0x7f00f00ebba0) at
/usr/src/debug/httpd-2.2.15/server/connection.c:43
#7 0x00007f010293c052 in process_socket (thd=0x7f010393a1b0, dummy=<value optimized
out>) at /usr/src/debug/httpd-2.2.15/server/mpm/worker/worker.c:544
#8 worker_thread (thd=0x7f010393a1b0, dummy=<value optimized out>) at
/usr/src/debug/httpd-2.2.15/server/mpm/worker/worker.c:894
#9 0x00007f01011d19d1 in ?? ()
#10 0x00007f00d8dda700 in ?? ()
#11 0x0000000000000000 in ?? ()
{code}
{code}
(gdb) disassemble
...
0x00007f00fd1558f4 <+452>: mov 0x58(%rsp),%rax
0x00007f00fd1558f9 <+457>: lea 0x82f0(%rip),%rsi # 0x7f00fd15dbf0
0x00007f00fd155900 <+464>: mov %r13,%rdi
0x00007f00fd155903 <+467>: add 0x138(%rax),%rax
=> 0x00007f00fd15590a <+474>: mov 0xc0(%rax),%r9
{code}
{code}
(gdb) x/gx $rsp+0x58
0x7f00d8dd9b98: 0x00007f01028d4e60
(gdb) x/gx 0x00007f01028d4e60+0x138
0x7f01028d4f98: 0x0000000000000140
(gdb) print/x 0x00007f01028d4e60+0x140
$1 = 0x7f01028d4fa0
(gdb) # therefore, rax should be 0x7f01028d4fa0, but in fact:
(gdb) info registers rax
rax 0xfe01a299c750 279282976409424
(gdb)
{code}
It looks occurring under race condition.
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