From owner-freebsd-hackers@FreeBSD.ORG  Wed Mar 30 00:58:42 2011
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Date: Wed, 30 Mar 2011 00:58:42 +0000
From: Alexander Best <arundel@freebsd.org>
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Subject: dtrace's hotkernel script reports a memory location (0xffffffff80)
	instead of a function name
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hi there,

while running the hotkernel dtrace script from DTraceToolkit-0.99 i noticed the
following:

[...]
kernel`sopoll_generic                                      60   0.1%
kernel`bcopy                                               80   0.2%
kernel`uma_zalloc_arg                                     100   0.2%
kernel`selrecord                                          100   0.2%
kernel`__curthread                                        110   0.2%
kernel`syscallenter                                       120   0.2%
kernel`fget_unlocked                                      130   0.3%
kernel`0xffffffff80                                       140   0.3%
kernel`copyin                                             190   0.4%
kernel`copyout                                            220   0.4%
kernel`inl                                                491   1.0%
kernel`atomic_cmpset_long                                 570   1.1%
kernel`write_rflags                                       652   1.3%
kernel`ia32_pause                                        1211   2.4%
kernel`cpu_mwait                                         1610   3.2%
kernel`sched_idletd                                      1900   3.8%
kernel`acpi_cpu_c1                                      40284  80.3%

i talked to a few people on #bsddev, but nobody could tell me what 0xffffffff80
was refering to.

kgdb(1) reports "Error accessing memory address 0xffffffff80: Bad address" for
that location.

any idea?

-- 
a13x