-current kernel hang with a 4.0 binary

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hi,
I've got a -current NetBSD/sparc (sun4U system) system hang, reliably,
when building pkgsrc/python24 on a 4.0 userland. Here's what ddb says:
[BREAK]
Stopped in pid 7114.1 (conftest) at     netbsd:cpu_Debugger+0x4:        nop
db> tr
sparc_interrupt(b945a30, cc7d700, cc7d700, 0, ded7fc0, ded1f80) at 
netbsd:sparc_interrupt+0x1f0
sys_sa_enable(cc7d700, d4bbdd0, d4bbe10, 1, 0, 1c14000) at 
netbsd:sys_sa_enable+0xd8
syscall_plain(d4bbed0, cc52d20, 400f4f34, d4bbdd0, 400, 400f4f38) at 
netbsd:syscall_plain+0x318
?(ffe00034, ffffb744, c, 3, ffffb7f7, ffffb7f8) at 0x1008c74
db> 

the stack trace is always the same.

dissasembly:

netbsd:sparc_interrupt+0x1c8:   subcc           %l7, %l2, %g0
netbsd:sparc_interrupt+0x1cc:   bne,pn          netbsd:sparc_interrupt+0x1ac
netbsd:sparc_interrupt+0x1d0:   add             %sp, 0xb0, %o2
netbsd:sparc_interrupt+0x1d4:   ld              [%l2 + 0x18], %l7
netbsd:sparc_interrupt+0x1d8:   membar          0x4l
netbsd:sparc_interrupt+0x1dc:   st              %g0, [%l2 + 0x18]
netbsd:sparc_interrupt+0x1e0:   membar          0x4l
netbsd:sparc_interrupt+0x1e4:   ld              [%l2 + 0x0], %o4
netbsd:sparc_interrupt+0x1e8:   ld              [%l2 + 0x4], %o0
netbsd:sparc_interrupt+0x1ec:   wrpr            %g0, 0xe, %pstate
netbsd:sparc_interrupt+0x1f0:   jmpl            [%o4 + %g0], %o7
netbsd:sparc_interrupt+0x1f4:   movrz           %o0, %o2, %o0
netbsd:sparc_interrupt+0x1f8:   wrpr            %g0, 0xc, %pstate
netbsd:sparc_interrupt+0x1fc:   ld              [%l2 + 0x20], %l1
netbsd:sparc_interrupt+0x200:   membar          0x4l
netbsd:sparc_interrupt+0x204:   brz,pn          %l1, 
netbsd:sparc_interrupt+0x214
netbsd:sparc_interrupt+0x208:   add             %l5, %o0, %l5
netbsd:sparc_interrupt+0x20c:   stx             %g0, [%l1 + %g0]
netbsd:sparc_interrupt+0x210:   membar          0x4l
netbsd:sparc_interrupt+0x214:   subcc           %l7, -0x1, %g0
netbsd:sparc_interrupt+0x218:   bne,pn          netbsd:sparc_interrupt+0x1d0



netbsd:sys_sa_enable+0xac:      ld              [%i0 + 0x10], %g1
netbsd:sys_sa_enable+0xb0:      or              %g0, %l0, %o1
netbsd:sys_sa_enable+0xb4:      subcc           %l0, %g1, %g0
netbsd:sys_sa_enable+0xb8:      bne,pn          netbsd:sys_sa_enable+0xfc
netbsd:sys_sa_enable+0xbc:      or              %g0, %i0, %o0
netbsd:sys_sa_enable+0xc0:      ld              [%i0 + 0x24], %g1
netbsd:sys_sa_enable+0xc4:      ld              [%i0 + 0x10], %o0
netbsd:sys_sa_enable+0xc8:      or              %g1, 0x400, %g1
netbsd:sys_sa_enable+0xcc:      st              %g1, [%i0 + 0x24]
netbsd:sys_sa_enable+0xd0:      call            netbsd:mutex_vector_exit
netbsd:sys_sa_enable+0xd4:      or              %g0, %l2, %i0
netbsd:sys_sa_enable+0xd8:      call            netbsd:mutex_exit
netbsd:sys_sa_enable+0xdc:      ld              [%l1 + 0xc], %o0
netbsd:sys_sa_enable+0xe0:      return          [%i7 + 0x8]
netbsd:sys_sa_enable+0xe4:      nop

any idea ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--