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https://issues.apache.org/jira/browse/ZOOKEEPER-591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843870#action_12843870
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Qian Ye commented on ZOOKEEPER-591:
-----------------------------------
The process still hang there, Mahadev.
(gdb) info thread
2 Thread 1094719840 (LWP 31877) 0x000000302b8089aa in
pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/tls/libpthread.so.0
1 Thread 182894113888 (LWP 31875) 0x000000302b806ffb in pthread_join () from
/lib64/tls/libpthread.so.0
(gdb) thread 1
[Switching to thread 1 (Thread 182894113888 (LWP 31875))]#0 0x000000302b806ffb
in pthread_join () from /lib64/tls/libpthread.so.0
(gdb) bt
#0 0x000000302b806ffb in pthread_join () from /lib64/tls/libpthread.so.0
#1 0x000000000040de5b in adaptor_finish (zh=0x515b60) at src/mt_adaptor.c:218
#2 0x00000000004060da in zookeeper_close (zh=0x515b60) at src/zookeeper.c:2109
#3 0x000000000040220b in main ()
(gdb) thread 2
[Switching to thread 2 (Thread 1094719840 (LWP 31877))]#0 0x000000302b8089aa
in pthread_cond_wait@@GLIBC_2.3.2 ()
from /lib64/tls/libpthread.so.0
(gdb) bt
#0 0x000000302b8089aa in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/tls/libpthread.so.0
#1 0x000000000040d8ab in wait_sync_completion (sc=0x5167f0) at
src/mt_adaptor.c:82
#2 0x00000000004082e9 in zoo_wget_children (zh=0x515b60, path=0x40ebe0
"/mytest", watcher=0x401fd8 <default_zoo_watcher>, watcherCtx=Variable
"watcherCtx" is not available.
)
at src/zookeeper.c:2889
#3 0x0000000000402037 in default_zoo_watcher ()
#4 0x000000000040d684 in deliverWatchers (zh=0x515b60, type=4, state=3,
path=0x515100 "/mytest", list=0x2a95700b08) at src/zk_hashtable.c:271
#5 0x0000000000403771 in process_completions (zh=0x515b60) at
src/zookeeper.c:1623
#6 0x000000000040e1d5 in do_completion (v=Variable "v" is not available.
) at src/mt_adaptor.c:332
#7 0x000000302b80610a in start_thread () from /lib64/tls/libpthread.so.0
#8 0x000000302afc6003 in clone () from /lib64/tls/libc.so.6
#9 0x0000000000000000 in ?? ()
I patched the patch to the c client source code version 3.2.2, not the working
copy, I think this won't make any difference, right?
> The C Client cannot exit properly in some situation
> ---------------------------------------------------
>
> Key: ZOOKEEPER-591
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-591
> Project: Zookeeper
> Issue Type: Bug
> Components: c client
> Affects Versions: 3.2.1
> Environment: Linux db-passport-test05.vm 2.6.9_5-4-0-5 #1 SMP Tue Apr
> 14 15:56:24 CST 2009 x86_64 x86_64 x86_64 GNU/Linux
> Reporter: Qian Ye
> Assignee: Mahadev konar
> Priority: Blocker
> Fix For: 3.3.0
>
> Attachments: ZOOKEEPER-591.patch, ZOOKEEPER-591.patch
>
>
> The following code produce a situation, where the C Client can not exit
> properly,
> #include "include/zookeeper.h"
> void default_zoo_watcher(zhandle_t *zzh, int type, int state, const char
> *path, void* context){
> int zrc = 0;
> struct String_vector str_vec = {0, NULL};
> printf("in the default_zoo_watcher\n");
> zrc = zoo_wget_children(zzh, "/mytest", default_zoo_watcher, NULL,
> &str_vec);
> printf("zoo_wget_children, error: %d\n", zrc);
> return;
> }
> int main()
> {
> int zrc = 0;
> int buff_len = 10;
> char buff[10] = "hello";
> char path[512];
> struct Stat stat;
> struct String_vector str_vec = {0, NULL};
> zhandle_t *zh = zookeeper_init("10.81.20.62:2181", NULL, 30000, 0, 0, 0);
> zrc = zoo_create(zh, "/mytest", buff, 10, &ZOO_OPEN_ACL_UNSAFE, 0, path,
> 512);
> printf("zoo_create, error: %d\n", zrc);
> zrc = zoo_wget_children(zh, "/mytest", default_zoo_watcher, NULL,
> &str_vec);
> printf("zoo_wget_children, error: %d\n", zrc);
> zrc = zoo_create(zh, "/mytest/test1", buff, 10, &ZOO_OPEN_ACL_UNSAFE, 0,
> path, 512);
> printf("zoo_create, error: %d\n", zrc);
> zrc = zoo_wget_children(zh, "/mytest", default_zoo_watcher, NULL,
> &str_vec);
> printf("zoo_wget_children, error: %d\n", zrc);
> zrc = zoo_delete(zh, "/mytest/test1", -1);
> printf("zoo_delete, error: %d\n", zrc);
> zookeeper_close(zh);
> return 0;
> }
> running this code can cause the program hang at zookeeper_close(zh);(line
> 38). using gdb to attach the process, I found that the main thread is waiting
> for do_completion thread to finish,
> (gdb) bt
> #0 0x000000302b806ffb in pthread_join () from /lib64/tls/libpthread.so.0
> #1 0x000000000040de3b in adaptor_finish (zh=0x515b60) at src/mt_adaptor.c:219
> #2 0x00000000004060ba in zookeeper_close (zh=0x515b60) at
> src/zookeeper.c:2100
> #3 0x000000000040220b in main ()
> and the thread which handle the zoo_wget_children(in the default_zoo_watcher)
> is waiting for sc->cond.
> (gdb) thread 2
> [Switching to thread 2 (Thread 1094719840 (LWP 25093))]#0 0x000000302b8089aa
> in pthread_cond_wait@@GLIBC_2.3.2 ()
> from /lib64/tls/libpthread.so.0
> (gdb) bt
> #0 0x000000302b8089aa in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/tls/libpthread.so.0
> #1 0x000000000040d88b in wait_sync_completion (sc=0x5167f0) at
> src/mt_adaptor.c:82
> #2 0x00000000004082c9 in zoo_wget_children (zh=0x515b60, path=0x40ebc0
> "/mytest", watcher=0x401fd8 <default_zoo_watcher>, watcherCtx=Variable
> "watcherCtx" is not available.)
> at src/zookeeper.c:2884
> #3 0x0000000000402037 in default_zoo_watcher ()
> #4 0x000000000040d664 in deliverWatchers (zh=0x515b60, type=4, state=3,
> path=0x515100 "/mytest", list=0x5177d8) at src/zk_hashtable.c:274
> #5 0x0000000000403861 in process_completions (zh=0x515b60) at
> src/zookeeper.c:1631
> #6 0x000000000040e1b5 in do_completion (v=Variable "v" is not available.) at
> src/mt_adaptor.c:333
> #7 0x000000302b80610a in start_thread () from /lib64/tls/libpthread.so.0
> #8 0x000000302afc6003 in clone () from /lib64/tls/libc.so.6
> #9 0x0000000000000000 in ?? ()
> here, a deadlock presents.
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