beam crashes on inet_gethost port

Daniel Goertzen <>
Mon Jun 5 17:10:19 CEST 2006


I am still trying to get a cross compiled system going (x86_64 to i486, 
linux, R11B0), but am having troubles.  When I run my i486 erlang I get:

bash-3.00# erl
Segmentation Fault
bash-3.00#

After much tracing with strace, it is revealed that beam crashes after 
using inet_gethost as a port.  Beam appears to conduct a successful 
transaction with inet_gethost, then starts to close the port.  
inet_gethost shuts down properly, but beam segfaults immediately after 
receiving SIGCHLD.

Any ideas where to look next?

Thanks,
Dan.


Here is a fragment of a trace:

hints:
pid 3931 = beam
pid 3937 = inet_gethost
pid 3938 = inet_gethost child worker process
comments in double braces, ie {{comment}}


bash-3.00# strace -f erl
.
(snip)
.
[pid  3931] close(7)                    = 0         {{this is beam's 
write pipe to inet_gethost}}
[pid  3931] fcntl64(10, F_GETFL)        = 0x801 (flags O_WRONLY|O_NONBLOCK)
[pid  3931] fcntl64(10, F_SETFL, O_WRONLY) = 0
[pid  3931] close(10 <unfinished ...>
[pid  3937] <... select resumed> )      = 1 (in [0])
[pid  3931] <... close resumed> )       = 0
[pid  3937] read(0,  <unfinished ...>
[pid  3931] times( <unfinished ...>
[pid  3937] <... read resumed> "", 4)   = 0
[pid  3931] <... times resumed> {tms_utime=9, tms_stime=0, tms_cutime=0, 
tms_cstime=0}) = 1923210188
[pid  3937] kill(3938, SIGUSR1 <unfinished ...>    {{inet_gethost cleans 
up its child}}
[pid  3931] gettimeofday( <unfinished ...>
[pid  3937] <... kill resumed> )        = 0
[pid  3931] <... gettimeofday resumed> {1149519332, 422564}, NULL) = 0
[pid  3937] exit_group(0)               = ?
Process 3937 detached  {{inet_gethost}
[pid  3931] times({tms_utime=9, tms_stime=0, tms_cutime=0, 
tms_cstime=0}) = 1923210188
[pid  3931] --- SIGCHLD (Child exited) @ 0 (0) ---     {{ beam sees 
inet_gethost exiting }}
[pid  3931] --- SIGSEGV (Segmentation fault) @ 0 (0) ---  {{beam goes 
tits up :( }}
[pid  3938] <... read resumed> "", 4)   = 0
[pid  3938] --- SIGUSR1 (User defined signal 1) @ 0 (0) ---
Process 3938 detached
[pid  3935] <... poll resumed> [{fd=5, events=POLLIN}], 1, 2000) = -1 
EINTR (Interrupted system call)
[pid  3936] +++ killed by SIGKILL +++
[pid  3931] +++ killed by SIGSEGV +++
+++ killed by SIGKILL +++
bash-3.00#




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