When I updated Julia today on my Mac (10.9.2), I got the following error:

/bin/sh: line 1: 23089 Segmentation fault: 11
/Users/danluu/dev/julia/usr/bin/julia --build
/Users/danluu/dev/julia/usr/lib/julia/sys
-J/Users/danluu/dev/julia/usr/lib/julia/$([ -e
/Users/danluu/dev/julia/usr/lib/julia/sys.ji ] && echo sys.ji || echo
sys0.ji) -f sysimg.jl
* This error is usually fixed by running 'make clean'. If the error
persists, try 'make cleanall'. *
make[1]: * [/Users/danluu/dev/julia/usr/lib/julia/sys.o] Error 1
make: * [release] Error 2

I've tried doing make cleanall, and even wiping out my repository and
re-cloning in case it's a problem with deps, and I still get the same
error.

On Linux (64-bit, 3.2.0-65-generic), the build doesn't error out, but
Julia segfaults on startup. The gdb backtrace for that is:
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6e2328c in jl_deserialize_gv (v=0x7bb138, s=0x7fffffffdcc0)
at dump.c:145
145             *sysimg_gvars[gvname_index] = v;
(gdb) bt
#0  0x00007ffff6e2328c in jl_deserialize_gv (v=0x7bb138,
s=0x7fffffffdcc0) at dump.c:145
#1  jl_deserialize_value_internal (s=0x7fffffffdcc0) at dump.c:854
#2  0x00007ffff6e233e5 in jl_deserialize_value (s=0x7fffffffdcc0) at dump.c:950
#3  jl_deserialize_value_internal (s=0x7fffffffdcc0) at dump.c:937
#4  0x00007ffff6e2350d in jl_deserialize_value (s=0x7fffffffdcc0) at dump.c:950
#5  jl_deserialize_datatype (pos=403560, s=0x7fffffffdcc0) at dump.c:646
#6  jl_deserialize_value_internal (s=0x7fffffffdcc0) at dump.c:886
#7  0x00007ffff6e22818 in jl_deserialize_value (s=0x7fffffffdcc0) at dump.c:950
#8  jl_deserialize_value_internal (s=0x7fffffffdcc0) at dump.c:715
...
#134 jl_deserialize_value_internal (s=0x7fffffffdcc0) at dump.c:715
#135 0x00007ffff6e233e5 in jl_deserialize_value (s=0x7fffffffdcc0) at dump.c:950
#136 jl_deserialize_value_internal (s=0x7fffffffdcc0) at dump.c:937
#137 0x00007ffff6e233e5 in jl_deserialize_value (s=0x7fffffffdcc0) at dump.c:950
#138 jl_deserialize_value_internal (s=0x7fffffffdcc0) at dump.c:937
#139 0x00007ffff6e23881 in jl_deserialize_value (s=0x7fffffffdcc0) at dump.c:950
#140 jl_restore_system_image (fname=<optimized out>) at dump.c:1060
#141 0x00007ffff6e1f33b in julia_init (
    imageFile=0x608e60
"/home/dluu/dev/julia/usr/bin/../lib/julia/sys.ji") at init.c:826
#142 0x000000000040140a in main (argc=0, argv=0x7fffffffe1c0) at repl.c:378