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Re: kern/38293: panic: fp_save ipi didn't

The following reply was made to PR port-amd64/38293; it has been noted by GNATS.

From: Simon Burge <>
Subject: Re: kern/38293: panic: fp_save ipi didn't 
Date: Fri, 20 Jun 2008 15:14:58 +1000 wrote:
 > The kernel panics in src/sys/arch/amd64/amd64/fpu.c
 > with "panic: fp_save ipi didn't"
 > In all panics I have got so far, the backtrace is always the same:
 > fpusave_lwp() at netbsd:fpusave_lwp+0x7b
 > cpu_lwp_free() at netbsd:cpu_lwp_free+0x2c
 > exit1() at netbsd:exit1+0x5f1
 > sys_exit() at netbsd:sys_exit+0x67
 > syscall() at netbsd:syscall+0xa9
 I've also just started seeing this too, amd64 with simonb-wapbl branch
 from June 19th.  I've seen three so far while running, and
 they've all been of the form:
    breakpoint() at netbsd:breakpoint+0x5 
    panic() at netbsd:panic+0x260 
    fpusave_lwp() at netbsd:fpusave_lwp+0x92 
    cpu_lwp_fork() at netbsd:cpu_lwp_fork+0x41 
    lwp_create() at netbsd:lwp_create+0x24f 
    fork1() at netbsd:fork1+0x45c 
    sys___vfork14() at netbsd:sys___vfork14+0x35 
    syscall() at netbsd:syscall+0x9a 
 Note that I've got a couple of printfs in some of the ufs filesystem
 functions, so there's quite a lot of console output happening all the
 time.  I've not seen this problem without those printfs.  Does these
 mean something timing related then?

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