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Re: kern/37933: very frequent crashes after suspend/resume

Steven M. Bellovin wrote:
The following reply was made to PR kern/37933; it has been noted by GNATS.

From: "Steven M. Bellovin" <>
Subject: Re: kern/37933: very frequent crashes after suspend/resume
Date: Sun, 10 Feb 2008 00:15:15 +0000

 I managed to get a core dump.  I booted single-user, set ddb.onpanic=0,
 zeroed most of main memory via a program that malloced a lot of
 memory with _malloc_options=Z to make the core dump smaller, and did two
 sysctl machdep.sleep_state=3.  On the second resume, it panicked.  The
resulting dump and kernel file (with symbols) are at
The traceback in the dump (and for that matter the panic string printed
 at crash time) are different than in the original PR, but I suspect
 that that's more a helpful clue than a hindrance -- the crash is 100%
 reproducible, which suggests that the different backtraces are symptoms
 of the same underlying issue.
This dump, btw, is from 4.99.53, from sources retrieved today.

Are you using cpuctl to offline all APs before you suspend?

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