Subject: kern/21550: kernel: double fault trap, code=0
To: None <>
From: None <>
List: netbsd-bugs
Date: 05/12/2003 16:23:17
>Number:         21550
>Category:       kern
>Synopsis:       kernel: double fault trap, code=0
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 12 14:24:00 UTC 2003
>Originator:     Thomas Klausner
>Release:        NetBSD 1.6R/i386
Architecture: i386
Machine: i386
On a machine that was basically only cftp in a screen session (and
some daemons in the background, will provide details for those
later), no user interaction, I found:
kernel: double fault trap, code=0
Stopped in pid 536.1 (cftp) at  softclock+0x23d: popl %ebx
db> tr/u
softclock(0,d45b6f08,c032f2bc,d45b6f14,0) at softclock+0x23d
softintr_dispatch(0,10,d3fc0030,10,d45b0010) at softintr_dispatch+0xb1
Xsoftclock() at Xsoftclock+0x25
--- interrupt ---
syscall_plain(bfbf001f,bfbf001f,806001f,bfbf001f,bfbff50c) at syscall_plain+0x63

I didn't get the ddb prompt back at this point.
The machine hasn't had this problem before, and I had similar usage patterns
No clue.