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From "Marshall McMullen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ZOOKEEPER-2311) assert in setup_random
Date Mon, 02 Nov 2015 20:25:27 GMT
Marshall McMullen created ZOOKEEPER-2311:
--------------------------------------------

             Summary: 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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