_lwp_park issue?

[Rui-Xiang Guo <rxg%lavabit.com@localhost>]

Hi, all.
When testing chromium 11, I get such error on both NetBSD-5.1 amd64/i386.
It looks like the pthread issue. Here is the gdb output -
[...]
Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007f7ff6934d4a in _lwp_park () from /usr/lib/libc.so.12
(gdb) bt
#0  0x00007f7ff6934d4a in _lwp_park () from /usr/lib/libc.so.12
#1  0x00007f7ff6c0840a in pthread_mutex_trylock ()
   from /usr/lib/libpthread.so.0
#2  0x0000000000d31aed in base::internal::LockImpl::Lock ()
#3  0x0000000001664b72 in BrowserThread::PostTaskHelper ()
#4  0x0000000001664d71 in BrowserThread::PostTask ()
#5  0x0000000000595a04 in SafeBrowsingService::GetDatabase ()
#6  0x0000000000d0737e in MessageLoop::RunTask ()
#7  0x0000000000d075d8 in MessageLoop::DeferOrRunPendingTask ()
#8  0x0000000000d0781d in MessageLoop::DoWork ()
#9  0x0000000000d0b85b in base::MessagePumpDefault::Run ()
#10 0x0000000000d07bc2 in MessageLoop::RunInternal ()
#11 0x0000000000d07d54 in MessageLoop::Run ()
#12 0x0000000000d3822e in base::Thread::ThreadMain ()
#13 0x0000000000d35902 in base::(anonymous namespace)::ThreadFunc ()
#14 0x00007f7ff6c0bd92 in pthread_setcancelstate ()
   from /usr/lib/libpthread.so.0
#15 0x00007f7ff69545b0 in swapcontext () from /usr/lib/libc.so.12
#16 0x00007f7ff3200000 in ?? ()
#17 0x0000000111110001 in ?? ()
#18 0x0000000033330003 in ?? ()
#19 0x0000000000000000 in ?? ()

Any idea to resolve it?

-rxg