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From "Marshall McMullen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2311) assert in setup_random
Date Mon, 02 Nov 2015 20:37:27 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14985978#comment-14985978
] 

Marshall McMullen commented on ZOOKEEPER-2311:
----------------------------------------------

Another interesting link related to this:

https://bugzilla.kernel.org/show_bug.cgi?id=80981

> assert in setup_random
> ----------------------
>
>                 Key: ZOOKEEPER-2311
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2311
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: c client
>            Reporter: Marshall McMullen
>
> We've started seeing an assert failing inside setup_random at line 537:
>  528 static void setup_random()
>  529 {
>  530 #ifndef _WIN32          // TODO: better seed
>  531     int seed;
>  532     int fd = open("/dev/urandom", O_RDONLY);
>  533     if (fd == -1) {
>  534         seed = getpid();
>  535     } else {
>  536         int rc = read(fd, &seed, sizeof(seed));
>  537         assert(rc == sizeof(seed));
>  538         close(fd);
>  539     }
>  540     srandom(seed);
>  541     srand48(seed);
>  542 #endif
> The core files show:
> Program terminated with signal 6, Aborted.
> #0  0x00007f9ff665a0d5 in raise () from /lib/x86_64-linux-gnu/libc.so.6
> #0  0x00007f9ff665a0d5 in raise () from /lib/x86_64-linux-gnu/libc.so.6
> #1  0x00007f9ff665d83b in abort () from /lib/x86_64-linux-gnu/libc.so.6
> #2  0x00007f9ff6652d9e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
> #3  0x00007f9ff6652e42 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
> #4  0x00007f9ff8e4070a in setup_random () at src/zookeeper.c:476
> #5  0x00007f9ff8e40d76 in resolve_hosts (zh=0x7f9fe14de400, hosts_in=0x7f9fd700f400 "10.26.200.6:2181,10.26.200.7:2181,10.26.200.8:2181",
avec=0x7f9fd87fab60) at src/zookeeper.c:730
> #6  0x00007f9ff8e40e87 in update_addrs (zh=0x7f9fe14de400) at src/zookeeper.c:801
> #7  0x00007f9ff8e44176 in zookeeper_interest (zh=0x7f9fe14de400, fd=0x7f9fd87fac4c, interest=0x7f9fd87fac50,
tv=0x7f9fd87fac80) at src/zookeeper.c:1980
> #8  0x00007f9ff8e553f5 in do_io (v=0x7f9fe14de400) at src/mt_adaptor.c:379
> #9  0x00000000020170ac in solidfire::ThreadBacktraces::LaunchThread (this=0x7f9ff0c8d500,
args=<optimized out>) at shared/ThreadBacktraces.cpp:497
> #10 0x00007f9ff804de9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
> #11 0x00007f9ff671738d in clone () from /lib/x86_64-linux-gnu/libc.so.6
> #12 0x0000000000000000 in ?? ()
> I'm not sure what the underlying cause of this is... But POSIX always allows for a short
read(2), and any program MUST check for short reads... 
> Has anyone else encountered this issue? We are seeing it rather frequently which is concerning.



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