DTrace in 7.1-p2

alp · #1 January 28th, 2009, 17:41

Hello.
I've updated to FreeBSD-7.1-p2 and I'm going to look at DTrace. But I have the following error after compiling new kernel according the instructions in Handbook:

Code:

# ./hotkernel
Sampling... Hit Ctrl-C to end.
dtrace: invalid probe specifier 
	#pragma D option quiet
	profile:::profile-1001hz
	/arg0/
	{
		@pc[arg0] = count();
	}
	dtrace:::END
	{
		printa("%a %@d\n", @pc);
	}
: "/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"

I have compiled kernel with the following options:

Code:

options         KDTRACE_FRAME   # Ensure frames are compiled in - need it on amd64
options         KDTRACE_HOOKS           # Kernel DTrace hooks
options         DDB_CTF # DTrace CTF.

and made make WITH_CTF=1 kernel KERNCONF=MyConf

ctfdump on /boot/kernel/kernel gives a long listing, begining with:

Code:

- CTF Header -----------------------------------------------------------------

  cth_magic    = 0xcff1
  cth_version  = 2
  cth_flags    = 0x01
  cth_parlabel = (anon)
  cth_parname  = (anon)
  cth_lbloff   = 0
  cth_objtoff  = 8
  cth_funcoff  = 19910
  cth_typeoff  = 41348
  cth_stroff   = 41348
  cth_strlen   = 37

- Label Table ----------------------------------------------------------------

      0 FreeBSD 7.1-RELEASE-p2 amd64 701000

- Data Objects ---------------------------------------------------------------

  [0] 0        __set_sysctl_set_sym_sysctl___kern_cam (3)

Maledictus · #2 January 28th, 2009, 22:43

Hmm, I had the same error but I forgot WITH_CTF=1 at that time. The first thing I tried was renaming psinfo.d which kinda helped too. Maybe just try that too?

alp · #3 January 29th, 2009, 07:23

It shouldn't help, cause as I understand this will make the psinfo struct unknown to DTrace. It seems, DTrace doesn't understand uid_t type...

**nox@** · #4 January 31st, 2009, 11:50

Quote:

Originally Posted by alp

Hello.
I've updated to FreeBSD-7.1-p2 and I'm going to look at DTrace. But I have the following error after compiling new kernel according the instructions in Handbook:
# ./hotkernel
Sampling... Hit Ctrl-C to end.
[...]
: "/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"

I have compiled kernel with the following options:
[...]

I don't see a problem with your kernel options, the same script 'works' here (works in quotes because using too many fbt probes like this does can cause panics which is a known problem mentioned in an early DTrace for FreeBSD - sources available via cvsup announcement) - maybe you forgot to # kldload dtraceall or something went wrong with the way you did the installkernel?

f-andrey · #5 January 31st, 2009, 19:01

My sistem dtrace not working to

Code:

test# uname -a
FreeBSD test.local 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Sat Jan 31 18:35:34 MSK 2009     andrey@test.local:/usr/obj/usr/src/sys/MY_USB2  amd64
test# kldstat 
Id Refs Address            Size     Name
...
 8    1 0xffffffff80cff000 1588     dtraceall.ko
 9    4 0xffffffff80d01000 51e8     cyclic.ko
10    9 0xffffffff80d07000 3678     opensolaris.ko
11    7 0xffffffff80d0b000 14fab0   dtrace.ko
12    2 0xffffffff80e5b000 1e40     dtmalloc.ko
13    2 0xffffffff80e5d000 4b30     fbt.ko
...
test# dtrace -l
   ID   PROVIDER  MODULE         FUNCTION NAME
    1     dtrace                 BEGIN
    2     dtrace                 END
    3     dtrace                 ERROR
    4    syscall                 syscall entry
...
test# dtrace -l | wc -l
   30546
test# dtrace -n "syscall::::"
dtrace: invalid probe specifier syscall::::: "/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"

test# grep KDTRACE /usr/src/sys/amd64/conf/MY_USB2
options         KDTRACE_FRAME           # Ensure frames are compiled in
options         KDTRACE_HOOKS           # Kernel DTrace hooks
test# grep CTF /usr/src/sys/amd64/conf/MY_USB2 /etc/make.conf
/usr/src/sys/amd64/conf/MY_USB2:options         DDB_CTF
/etc/make.conf:WITH_CTF=1

Mayby this is because of amd64?

**trasz@** · #6 July 20th, 2010, 21:51

The '/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"' error means you have to recompile your kernel and world with "WITH_CTF=1" in /etc/src.conf.

mjb · #7 December 7th, 2010, 13:07

I know it's an old thread, but this is one of the top google results for psinfo.d so may help someone else with the same problem

Quote:

Originally Posted by trasz@

The '/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"' error means you have to recompile your kernel and world with "WITH_CTF=1" in /etc/src.conf.

This may have been the case previously or for 7.x, but the wiki page says:

Quote:

Note: WITH_CTF=1 in the kernel config file works only on 9-CURRENT (or later) but not for stable/8. For stable/8 specify WITH_CTF on the make command line. In either case WITH_CTF=1 will not be picked up from make.conf or src.conf for the kernel build.

After failing to RTFM properly the first time around, I can confirm you do need it on the 'make kernel' command line (at least on 8.2-PRERELEASE), not just in src.conf

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