Date: Mon, 2 Oct 2000 16:41:39 -0700 From: Jason Evans <jasone@canonware.com> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: freebsd-smp@freebsd.org Subject: Re: witness code status? Message-ID: <20001002164139.I58256@canonware.com> In-Reply-To: <200010022332.e92NWan00373@troutmask.apl.washington.edu>; from sgk@troutmask.apl.washington.edu on Mon, Oct 02, 2000 at 04:32:36PM -0700 References: <200010022332.e92NWan00373@troutmask.apl.washington.edu>
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On Mon, Oct 02, 2000 at 04:32:36PM -0700, Steve Kargl wrote: > What's the current status of the integration of BSDi's > witness code? If I include "options WITNESS" in my kernel > config file, I get an immediate panic at boot. My sources > are from today (01 Oct 00), and the system is currently > running a MP kernel (built without the witness code). > > PS: Yes, I know there will be periods of instability, but > you (the SMP developers) can't possibly have all combinations > of MP hardware. I (and others) have been running kernels with the witness code enabled for over a month. The witness code's purpose is to detect lock cycles that could cause deadlock, among other incorrect mutex uses. The stack trace and panic message in your email seem indicate a programming error. In other words, the witness code is doing its job. Jason > panic: mutex_enter: MTX_DEF on MTX_SPIN mutex random harvest\ > @/usr/src/sys/modules/randomdev/../../dev/randomdev/yarrow.c:515 > cpuid = 1; lapic.id = 00000000 > Debugger("panic') > > CPU1 stopping CPUs: 0x00000001 stopped > Stopped at Debugger+0x38: movb $0,in_Debugger.684 > > db>trace > Debugger(c0277da1) > panic > witness_enter > _mtx_enter > random_harvest_internal > write_random > random_write > ufs_vnoperatespec > vn_write > dofilewrite > write > syscall2 > Xint0x80_syscall To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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