kern/38954: panic: fp_save ipi didn't

[kardel%pip.acrys.com@localhost]

>Number:         38954
>Category:       kern
>Synopsis:       panic: fp_save ipi didn't
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jun 14 11:50:01 +0000 2008
>Originator:     Frank Kardel
>Release:        NetBSD 4.99.64.20080614
>Organization:
        
>Environment:
        
        
System: NetBSD pip.kardel.name 4.99.64 NetBSD 4.99.64 (PIPADJ) #3: Sat Jun 14 
08:58:36 MEST 2008 
kardel%pip.kardel.name@localhost:/fs/raid1a/src/NetBSD/tc-merge/src/sys/arch/i386/compile/obj.i386/PIPADJ
 i386
Architecture: i386
Machine: i386
>Description:
        System is very unreliable/unstable - panic: fp_save ipi didn't
        amd64 in i386 mode

        Crash in ntpd. ntpd uses fp, is single threaded, uses SIGIO 
(extensively) for network AND tty-io.

        Stacktrace:
        panic: fp_save ipi didn't
        fatal breakpoint trap in supervisor mode
        trap type 1 code 0 eip c058c15c cs 8 eflags 200246 cr2 bb907020 ilevel 0
        Stopped in pid 475.1 (ntpd) at  netbsd:breakpoint+0x4:  popl    %ebp
        db{1}> 
breakpoint(c0ac3c9f,cf26c828,c33af800,c0570010,cf26c934,cf1ea180,cf26c84c,8e8f52,8,0)
 at netbsd:breakpoint+0x4
        
panic(c0aaedcb,8,1,cf1ea180,cf1a288c,17,cf26c86c,126c958,cf26c958,cf1ea180) at 
netbsd:panic+0x1b8
        
npxsave_lwp(cf1ea180,1,cf2bc098,cf26c8a4,cf26cc9c,cf26c8d4,cf26cc4c,c0592def,cf1ea180,cf26c958)
 at netbsd:npxsave_lwp+0
        xa2
        
cpu_getmcontext(cf1ea180,cf26c958,cf26c934,bfbfea44,17,cf26cd48,8094274,3,cf1a288c,cf1ea180)
 at netbsd:cpu_getmcontext+
        0xed
        sendsig(cf26cc70,cf1ea324,cf1ea324,0,0,1000000,cf1ea324,0,0,0) at 
netbsd:sendsig+0x23f
        postsig(17,cf26ccc4,10,402000,0,0,0,4,cf1ea180,c0aebc68) at 
netbsd:postsig+0xe6
        
lwp_userret(cf1ea180,cf26cd00,cf26cd28,126cd40,cf1ea180,cf1ea180,cf26cd3c,bfbfedf4,0,bfbfedf4)
 at netbsd:lwp_userret+0x
        148
        syscall(cf26cd48,b3,ab,1f,bfbf001f,5,0,bfbfee08,bfbfedf4,0) at 
netbsd:syscall+0x157

>How-To-Repeat:
        run -current-4.99.64-20080614. lightly loaded - network - ntpd (with 
tty refclocks) - raid recovery likely
>Fix:

>Unformatted: