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gdb provokes domU crash



I have an amd64 domU on amd64 domO, all current.  The domU may be a bit
behind.  I have not tried this on amd64 non-xen.

On the domU, I run gdb on a program (that I can't share).  This program
isn't really 64-bit clean - that's why I want to run the debugger.  It
has its own malloc version, and I did the equivalent of "break Our_Free"
and then ran it.  On my ssh connection where I was doing this I got:

Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007f7ffd93375a in _lwp_unpark () from /usr/lib/libc.so.12
(gdb) i thr
(gdb) threa
[Current thread is 0 (process 34)]
(gdb) i threads
(gdb) next
Single stepping until exit from function _lwp_unpark, 
which has no line number information.
[and then nothing]


On the console:


NetBSD/amd64 (domU-in-question.ir.bbn.com) (console)

login: panic: kernel diagnostic assertion "sigismember(&sp->sp_set, signo)" 
failed: file "/n0/netbsd-current/src/sys/kern/kern_sig.c", line 510
Begin traceback...
copyright() at netbsd:__kernassert+0x2ab72
fatal protection fault in supervisor mode
trap type 4 code 0 rip ffffffff803714e4 cs e030 rflags 10246 cr2  
ffffa0000f39cd60 cpl 0 rsp ffffa0000f398810
panic: trap
Faulted in mid-traceback; aborting...
dump to dev 142,1 not possible
rebooting...


I will see about updating the domU and trying again and looking a bit
further, but wanted to see if this seemed familiar.

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