Userland dtrace broken?

Matt Burke mattblists at
Wed Aug 29 13:01:21 UTC 2012

Following on 9.1-RC1, the example
fails to work as demonstrated:

# dtrace -s pid.d -c test
dtrace: script 'pid.d' matched 2 probes
CPU     ID                    FUNCTION:NAME
  1  59284                       main:entry
dtrace: pid 25479 exited with status 1


Also, I get hangs when trying to do pretty much anything with the pid:::entry

# dtrace -n 'pid$target::malloc:entry' -c 'echo x'
dtrace: description 'pid$target::malloc:entry' matched 2 probes
xCPU     ID                    FUNCTION:NAME
  1  59311                     malloc:entry
load: 0.43  cmd: dtrace 63737 [running] 8.93r 1.60u 4.19s 35% 25072k
load: 0.88  cmd: echo 63738 [running] 45.10r 2.27u 18.75s 47% 1452k
load: 1.19  cmd: dtrace 63737 [running] 70.32r 12.14u 33.27s 64% 25072k

# procstat -k 63737 63738
  PID    TID COMM             TDNAME           KSTACK
63737 101505 dtrace           -                mi_switch
sleepq_catch_signals sleepq_timedwait_sig _sleep do_wait
__umtx_op_wait_uint_private amd64_syscall Xfast_syscall
63737 111024 dtrace           -                <running>
63738 101657 echo             -                mi_switch
thread_suspend_switch ptracestop cursig ast doreti_ast

I have previously tried using dtrace on 9.0R, but it was insta-panic. Is
there anything I may have missed here?


kernel config:
include         GENERIC
ident           DTRACE

makeoptions     DEBUG="-g"
makeoptions     WITH_CTF=1
options         KDTRACE_FRAME
options         KDTRACE_HOOKS
options         DDB_CTF
options         DDB

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