[[ cross posted in case it's more than a pmax issue ]]

I just compiled and booted a -current GENERIC kernel with sources about
24 hours old, and all dynamic executables fail immediately.  This is
with a -current userland of about December 8 last year vintage.

Here's the tail end of a ktrace for "grep" that fails with the new kernel:

    18 ktrace   CALL  execve(0x7ffff808,0x7ffffce0,0x7ffffce8)
    18 ktrace   NAMI  "/usr/bin/grep"
    18 ktrace   NAMI  "/usr/libexec/ld.elf_so"
    18 grep     EMUL  "netbsd"
    18 grep     RET   execve JUSTRETURN
    18 grep     PSIG  SIGSEGV SIG_DFL
    18 grep     NAMI  "grep.core"

and for an normal "grep" on my December 8 kernel:

   205 ktrace   CALL  execve(0x7ffff170,0x7ffff640,0x7ffff648)
   205 ktrace   NAMI  "/usr/bin/grep"
   205 ktrace   NAMI  "/usr/libexec/ld.elf_so"
   205 grep     EMUL  "netbsd"
   205 grep     RET   execve JUSTRETURN
   205 grep     CALL  __sysctl(0x7ffff4e4,0x2,0x5ffeb090,0x7ffff4ec,0,0)
   205 grep     RET   __sysctl 0
   205 grep     CALL  mmap(0,0x8000,0x3,0x1004,0xffffffff,0,0,0)
   205 grep     RET   mmap 537030656/0x20027000
	... and so on ...

I'm still getting over holidays and catching up on mail.  Did any signal
stuff change recently (the PSIG in the first ktrace)?  If I get no
leads, I'll look at this further tomorrow...

Simon.