[rucksack-devel] SBCL fake_foreign_call falling through

[Cyrus Harmon]

I'm seeing a fair number of these kind of errors, which are not  
pleasant:

fatal error encountered in SBCL pid 29896:
fake_foreign_call fell through
LDB monitor
ldb> backtrace
Backtrace:
    0: Foreign function ldb_monitor, fp = 0x2206948, ra = 0x70d7
    1: Foreign function lose, fp = 0x2206978, ra = 0x586e
    2: Foreign function arch_install_interrupt_handlers, fp =  
0x22069b8, ra = 0xd7e0
    3: Foreign function _sigtramp, fp = 0x22069d8, ra = 0x9011110c
    4: Foreign fp = 0x2206d2c, ra = 0xffffffff
    5: (SB-C::TL-XEP SB-IMPL::FD-SOUT)

(this is with ~1M objects in the rucksack). I think we're putting too  
many objects in the cache when we scan the b-trees to find nodes,  
but, still that should cause SBCL to blow up so horribly.

Cyrus