30 Dec
2015
30 Dec
'15
8:24 a.m.
On Tue, Dec 29, 2015 at 9:18 PM, Alex Potapenko <opotapenko(a)gmail.com> wrote:
I'm unable to get core dump due to system limitations (it's a router):
I run `ulimit -c unlimited`, yet core dump is never to be found on the
system after crash :(
Looks like your kernel config simply disables core dumps, just check
that CONFIG_ELF_CORE parameter is set to yes.
Using gdb, I got this:
#0 0x4004c05c in _dl_debug_state () from /opt/lib/ld-uClibc.so.1
No symbol table info available.
#1 0x40050394 in _dl_get_ready_to_run () from /opt/lib/ld-uClibc.so.1
No symbol table info available.
#2 0x40050864 in ?? () from /opt/lib/ld-uClibc.so.1
No symbol table info available.
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Just gdb notification, non informative.
I then installed non-stripped uclibc-ng, libffi and
openjdk8
libraries, and got a more informative output (see gdb.log attached).
Yes, it is much better (gdb.log):
...
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x40ac24d0 (LWP 15709)]
0x4010c804 in initLocalIfs () from /opt/lib/openjdk8/arm/libnet.so
(gdb) bt full
#0 0x4010c804 in initLocalIfs () from /opt/lib/openjdk8/arm/libnet.so
No symbol table info available.
#1 0x4010b3f4 in JNI_OnLoad () from /opt/lib/openjdk8/arm/libnet.so
No symbol table info available.
#2 0x40135de0 in Java_java_lang_ClassLoader_00024NativeLibrary_load
() from /opt/lib/jvm/openjdk8/jre/lib/arm/libjava.so
No symbol table info available.
#3 0x401a433c in ffi_call_SYSV () from /opt/lib/libffi.so.6
No symbol table info available.
#4 0x401a5a54 in ffi_call () from /opt/lib/libffi.so.6
No symbol table info available.
#5 0x404c1640 in CppInterpreter::native_entry(Method*, int, Thread*)
() from /opt/lib/jvm/openjdk8/jre/lib/arm/server/libjvm.so
...
but points inside the OpenJDK native code. I'm found initLocalIfs()
function at jdk/src/solaris/native/java/net/net_util_md.c - very
strange for me, since you are running on linux. Probably, it is due
I'm not familiar with OpenJDK internals.
Anyway, are you able to:
1) update OpenJDK to latest jdk8u76-b01 & uClibc-ng to 1.0.10 ?
2) disable use of IPv6 at all, to exclude any chance of read of
"/proc/net/if_inet6" in initLocalIfs() ?
3) compile only libnet.so with -g3 switch to get a much more of debug info ?
P.S. You forgot to select "Reply all" to allow anyone see your mail in
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Leonid