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HTTPD deadlock

From: Brandon Ehle <azverkan_at_yahoo.com>
Date: 2002-12-09 20:06:52 CET

Runing my performance tests on the latest subversion produced a hard
lock in apache.

RedHat 8.0
Linux gig.pipedreaminteractive.com 2.4.19 #4 SMP Wed Nov 20 11:57:25 EST
2002 i686 i686 i386 GNU/Linux
Dual P3 1GHZ
1GB RAM
EXT3 fs
db4-4.0.14-14.i386.rpm
apache, apr, apr-util from CVS HEAD
neon 0.23.5
subversion from SVN HEAD

jerenkrantz suggested try db4.1 so I am going to attempt that now and
see if I get the same results.

Here is the backtrace from the threads that were running after I
attempted to "killall httpd" and the process never exited. The process
is still running if anyone wants more information from it.

(gdb) thread apply all bt

Thread 3 (Thread 139282 (LWP 23570)):
#0 0x420d3b2e in select () from /lib/i686/libc.so.6
#1 0x4020a510 in __JCR_LIST__ () from /lib/libdb-4.0.so
#2 0x401e82a1 in __os_yield () from /lib/libdb-4.0.so
#3 0x401759bf in __db_tas_mutex_lock () from /lib/libdb-4.0.so
#4 0x401dcf05 in __log_put_int () from /lib/libdb-4.0.so
#5 0x401dc966 in __log_put () from /lib/libdb-4.0.so
#6 0x401f8ee5 in __txn_regop_log () from /lib/libdb-4.0.so
#7 0x401f79cb in __txn_commit () from /lib/libdb-4.0.so
#8 0x403f8880 in commit_trail () from
/root/rpms/build/subversion/subversion/libsvn_fs/.libs/libsvn_fs-1.so.0
#9 0x403f896a in svn_fs__retry_txn () from
/root/rpms/build/subversion/subversion/libsvn_fs/.libs/libsvn_fs-1.so.0
#10 0x403fccad in svn_fs_apply_textdelta () from
/root/rpms/build/subversion/subversion/libsvn_fs/.libs/libsvn_fs-1.so.0
#11 0x403cc3c5 in dav_svn_open_stream () from
/etc/httpd/modules/mod_dav_svn.so
#12 0x4030000e in dav_method_put () from /etc/httpd/modules/mod_dav.so
#13 0x080684d5 in ap_run_handler ()
#14 0x08068aed in ap_invoke_handler ()
#15 0x080636a6 in ap_process_request ()
#16 0x0805ecac in ap_process_http_connection ()
#17 0x08071b65 in ap_run_process_connection ()
#18 0x08064b7c in process_socket ()
#19 0x0806532d in worker_thread ()
#20 0x40241ae6 in dummy_worker () from /usr/lib/libapr-0.so.0
#21 0x402b8941 in pthread_start_thread () from /lib/i686/libpthread.so.0

Thread 2 (Thread 16385 (LWP 23534)):
#0 0x420d224b in poll () from /lib/i686/libc.so.6
#1 0x402b7d9e in __pthread_manager () from /lib/i686/libpthread.so.0

Thread 1 (Thread 8192 (LWP 23525)):
#0 0x42028d69 in sigsuspend () from /lib/i686/libc.so.6
#1 0x402ba108 in __pthread_wait_for_restart_signal () from
/lib/i686/libpthread.so.0
#2 0x402b7911 in pthread_join () from /lib/i686/libpthread.so.0
#3 0x40241c9e in apr_thread_join () from /usr/lib/libapr-0.so.0
#4 0x08065903 in join_workers ()
#5 0x08065c75 in child_main ()
#6 0x08065ea3 in make_child ()
#7 0x08065f09 in startup_children ()
#8 0x0806693a in ap_mpm_run ()
#9 0x0806d6af in main ()
#10 0x420158d4 in __libc_start_main () from /lib/i686/libc.so.6

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Received on Mon Dec 9 20:05:12 2002

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