freebsd stable - Jul 2012 - sh(1) exiting on SIGWINCH

I've recently updated a box from 8-stable to 9-stable/amd64 (r237995),
compiled with gcc, and now sh(1) exits if I change the window size
(ssh'ing to the target system within an xterm).  I don't recall ever
seeing this sort of behaviour before and am still trying to track down
the relevant code path.

ktrace output looks like:
  1766 sh       GIO   fd 2 wrote 2 bytes
       "# "
  1766 sh       RET   write 2
  1766 sh       CALL  ioctl(0,TIOCGETA,0x801020364)
  1766 sh       RET   ioctl 0
  1766 sh       CALL  ioctl(0,TIOCSETAW,0x801020338)
  1766 sh       RET   ioctl 0
  1766 sh       CALL  read(0,0x7fffffffda8f,0x1)
  1766 sh       RET   read -1 errno 4 Interrupted system call
  1766 sh       PSIG  SIGWINCH caught handler=0x417d10 mask=0x0 code=0x10006
  1766 sh       CALL  sigreturn(0x7fffffffd600)
  1766 sh       RET   sigreturn JUSTRETURN
  1766 sh       CALL  ioctl(0,TIOCSETAW,0x80102030c)
  1766 sh       RET   ioctl 0
  1766 sh       CALL  setpgid(0,0x6e6)
  1766 sh       RET   setpgid -1 errno 1 Operation not permitted
  1766 sh       CALL  ioctl(0xa,TIOCSPGRP,0x7fffffffda74)
  1766 sh       RET   ioctl 0
  1766 sh       CALL  close(0xa)
  1766 sh       RET   close 0
  1766 sh       CALL  exit(0)

Does this ring any bells with anyone?

-- 
Peter Jeremy
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On 2012-Jul-04 20:03:32 +1000, Peter Jeremy <peter@server.rulingia.com>
wrote:
>I've recently updated a box from 8-stable to 9-stable/amd64 (r237995),
>compiled with gcc, and now sh(1) exits if I change the window size
>(ssh'ing to the target system within an xterm).  I don't recall ever
>seeing this sort of behaviour before and am still trying to track down
>the relevant code path.
Someone pointed me at kern/169603 and I can confirm that reverting
r237738 (MFC of r237448) fixes the problem.  Unfortunately, that is a
fairly large patch and so I haven't investigated further.

-- 
Peter Jeremy
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