[Bug tapsets/13501] New: Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[Bug tapsets/13501] New: Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[wcohen at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

             Bug #: 13501
           Summary: Some arguments for 'stap -L "*, *.*, *.*.*" ' probe
                    points not found
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
        AssignedTo: systemtap@sourceware.org
        ReportedBy: wcohen@redhat.com
    Classification: Unclassified


Created attachment 6110
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6110
stderr output listing problems with RHEL6 run of stap -L "*, *.*, *.*.*"

One would like to get an exhaustive list of probe points with:

stap -L "*, *.*, *.*.*"

However, on x86-64 RHEL 6.2 with systemtap 1.6 get a number of warnings about
arguments not being available.  Also get similar warnings on x86-64 Fedora
rawhide.

On RHEL6:
kernel-2.6.32-220.el6.x86_64
systemtap-1.6-4.el6.x86_64

On Fedora rawhide:
kernel-3.2.0-0.rc5.git1.1.fc17.x86_64
systemtap-1.6-1.fc16.x86_64

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[wcohen at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

--- Comment #1 from William Cohen <wcohen at redhat dot com> 2011-12-14 22:00:53 UTC ---
Created attachment 6111
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6111
Fedora rawhide stderr output from stap -L "*, *.*, *.*.*"

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

David Smith <dsmith at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dsmith at redhat dot com
         Depends on|                            |12413

--- Comment #2 from David Smith <dsmith at redhat dot com> 2011-12-15 15:30:52 UTC ---
The first error:

====
semantic error: unable to find member 'tid' for struct task_struct
(alternatives: state stack usage flags ptrace lock_depth prio static_prio
normal_prio rt_priority sched_class se rt preempt_notifiers fpu_counter
btrace_seq policy cpus_allowed sched_info tasks pushable_tasks mm active_mm
exit_state exit_code exit_signal pdeath_signal personality did_exec in_execve
in_iowait sched_reset_on_fork pid tgid stack_canary real_parent parent children
sibling group_leader ptraced ptrace_entry pids thread_group vfork_done
set_child_tid clear_child_tid utime stime utimescaled stimescaled gtime
prev_utime prev_stime nvcsw nivcsw start_time real_start_time min_flt maj_flt
cputime_expires cpu_timers real_cred cred cred_guard_mutex
replacement_session_keyring comm link_count total_link_count sysvsem
last_switch_count thread fs files nsproxy signal sighand blocked real_blocked
saved_sigmask pending sas_ss_sp sas_ss_size notifier notifier_data
notifier_mask audit_context loginuid sessionid seccomp utrace utrace_flags
parent_exec_id self_exec_id alloc_lock irqaction pi_lock pi_waiters
pi_blocked_on journal_info bio_list bio_tail reclaim_state backing_dev_info
io_context ptrace_message last_siginfo ioac acct_rss_mem1 acct_vm_mem1
acct_timexpd mems_allowed cpuset_mem_spread_rotor cpuset_slab_spread_rotor
mems_allowed_change_disable cgroups cg_list robust_list compat_robust_list
pi_state_list pi_state_cache __reserved_perf__ perf_event_mutex perf_event_list
mempolicy il_next fs_excl rcu splice_pipe delays dirties timer_slack_ns
default_timer_slack_ns scm_work_list curr_ret_stack ret_stack ftrace_timestamp
trace_overrun tracing_graph_pause trace trace_recursion rh_reserved
perf_event_ctxp): operator '->' at
/usr/share/systemtap/tapset/kprocess.stp:120:22
        source:     released_tid = $p->tid;
====

is a result of code introduced by bug #12413.

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

Bug 13501 depends on bug 12413, which changed state.

Bug 12413 Summary: kprocess.* support PIDs but not TIDs
http://sourceware.org/bugzilla/show_bug.cgi?id=12413

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |FIXED

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

--- Comment #3 from David Smith <dsmith at redhat dot com> 2011-12-15 16:01:27 UTC ---
The second set of RHEL6 errors comes from the the 'netdev.change_rx_flag' probe
alias:

====
# stap -L 'netdev.change_rx_flag'
semantic error: not accessible at this address (0xffffffff814483dc, dieoffset:
0x3c69de1): identifier '$dev' at
/usr/local/share/systemtap/tapset/networking.stp:159:29
        source:     dev_name = get_netdev_name($dev)
                                               ^
semantic error: not accessible at this address (0xffffffff814483dc, dieoffset:
0x3c69dd8): identifier '$flags' at :160:10
        source:     flags = $flags
                            ^
semantic error: unresolved type : identifier 'flags' at :160:2
        source:     flags = $flags
                    ^
netdev.change_rx_flag dev_name:string
====

This happens because the underlying kernel function 'dev_change_rx_flags' is
inlined on RHEL6 and systemtap can't find the arguments:

====
# stap -L 'kernel.function("dev_change_rx_flags").*'
kernel.function("dev_change_rx_flags@net/core/dev.c:3818").inline
====

On f15, systemtap can find the arguments to both the real function call and the
inlined version:

====
stap -L 'kernel.function("dev_change_rx_flags").*'
kernel.function("dev_change_rx_flags@net/core/dev.c:4360").call $dev:struct
net_device* $flags:int
kernel.function("dev_change_rx_flags@net/core/dev.c:4360").return $dev:struct
net_device* $flags:int
====

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

--- Comment #4 from David Smith <dsmith at redhat dot com> 2011-12-15 16:13:50 UTC ---
The following set of errors are a bit bogus, but I'm not sure how to quiet
them.

====
# stap -L '__scheduler.ctxswitch.kp'
semantic error: unable to find local 'new' near pc 0xffffffff8150aff7  in 
context_switch kernel/sched.c ( (alternatives: $next $prev $rq): identifier
'$new' at /usr/local/share/systemtap/tapset/scheduler.stp:174:19
        source:         next_priority = $new->prio
                                        ^
semantic error: unable to find local 'new' near pc 0xffffffff8150aff7  in 
context_switch kernel/sched.c ( (alternatives: $next $prev $rq): identifier
'$new' at :175:14
        source:         next_pid = $new->tgid
                                   ^
semantic error: unable to find local 'new' near pc 0xffffffff8150aff7  in 
context_switch kernel/sched.c ( (alternatives: $next $prev $rq): identifier
'$new' at :176:14
        source:         next_tid = $new->pid
                                   ^
semantic error: unable to find local 'new' near pc 0xffffffff8150aff7  in 
context_switch kernel/sched.c ( (alternatives: $next $prev $rq): identifier
'$new' at :177:15
        source:         next_task = $new
                                    ^
semantic error: unable to find local 'new' near pc 0xffffffff8150aff7  in 
context_switch kernel/sched.c ( (alternatives: $next $prev $rq): identifier
'$new' at :178:34
        source:         next_task_name = task_execname($new)
                                                       ^
semantic error: unable to find local 'new' near pc 0xffffffff8150aff7  in 
context_switch kernel/sched.c ( (alternatives: $next $prev $rq): identifier
'$new' at :179:19
        source:         nexttsk_state = $new->state
                                        ^
semantic error: unresolved type : identifier 'next_priority' at :174:3
        source:         next_priority = $new->prio
                        ^
semantic error: unresolved type : identifier 'next_pid' at :175:3
        source:         next_pid = $new->tgid
                        ^
semantic error: unresolved type : identifier 'next_tid' at :176:3
        source:         next_tid = $new->pid
                        ^
semantic error: unresolved type : identifier 'next_task' at :177:3
        source:         next_task = $new
                        ^
semantic error: unresolved type : identifier 'nexttsk_state' at :179:3
        source:         nexttsk_state = $new->state
                        ^
semantic error: unresolved type : identifier 'next_priority' at :158:3
        source:         next_priority = $next->prio
                        ^
semantic error: unresolved type : identifier 'next_pid' at :159:3
        source:         next_pid = $next->tgid
                        ^
semantic error: unresolved type : identifier 'next_tid' at :160:3
        source:         next_tid = $next->pid
                        ^
semantic error: unresolved type : identifier 'next_task' at :161:3
        source:         next_task = $next
                        ^
semantic error: unresolved type : identifier 'nexttsk_state' at :163:3
        source:         nexttsk_state = $next->state
                        ^
__scheduler.ctxswitch.kp prev_priority:long prev_pid:long prev_tid:long
prev_task:long prev_task_name:string prevtsk_state:long next_priority:unknown
next_pid:unknown next_tid:unknown next_task:unknown next_task_name:string
nexttsk_state:unknown $prev:struct task_struct* $rq:struct rq*
====

The above errors occur because on RHEL6 systemtap can't find the 'next'
argument of the inlined kernel function 'context_switch':

====
# stap -L 'kernel.function("context_switch").*'
kernel.function("context_switch@kernel/sched.c:2917").inline $prev:struct
task_struct* $rq:struct rq*
====

But, on RHEL6 the '__scheduler.ctxswitch.kp' probe alias isn't used - the
'scheduler.ctxswitch' prefers the '__scheduler.ctxswitch.tp' (tracepoint) probe
alias over the '__scheduler.ctxswitch.kp' (kprobe) probe alias.

====
# stap -L '__scheduler.ctxswitch.tp'
__scheduler.ctxswitch.tp __tracepoint_arg_prev:long __tracepoint_arg_next:long
next_pid:long next_tid:long next_task:long next_task_name:string
nexttsk_state:long next_priority:long prev_priority:long prev_pid:long
prev_tid:long prev_task:long prev_task_name:string prevtsk_state:long
$rq:struct rq* $prev:struct task_struct* $next:struct task_struct*


# stap -L 'scheduler.ctxswitch'
scheduler.ctxswitch __tracepoint_arg_prev:long __tracepoint_arg_next:long
next_pid:long next_tid:long next_task:long next_task_name:string
nexttsk_state:long next_priority:long prev_priority:long prev_pid:long
prev_tid:long prev_task:long prev_task_name:string prevtsk_state:long
name:string $rq:struct rq* $prev:struct task_struct* $next:struct task_struct*
====

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

--- Comment #5 from David Smith <dsmith at redhat dot com> 2011-12-15 18:34:16 UTC ---
The next set of errors can be seen by the following:

====
# stap -L 'sunrpc.clnt.create_client'
semantic error: unresolved type : identifier 'args' at
/usr/local/share/systemtap/tapset/rpc.stp:175:3
        source:         args = __rpc_create_args[tid()]
====

When we can't find the 'args' parameter of    
kernel.function("rpc_new_client").inline, we used a cached copy that is in the
__rpc_create_args global.  This error means we can't figure out what type
__rpc_create_args is.

I'm unsure of how to fix this one.

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

--- Comment #6 from David Smith <dsmith at redhat dot com> 2011-12-15 19:14:10 UTC ---
(In reply to comment #5)
> The next set of errors can be seen by the following:
> 
> ====
> # stap -L 'sunrpc.clnt.create_client'
> semantic error: unresolved type : identifier 'args' at
> /usr/local/share/systemtap/tapset/rpc.stp:175:3
>         source:         args = __rpc_create_args[tid()]
> ====
> 
> When we can't find the 'args' parameter of    
> kernel.function("rpc_new_client").inline, we used a cached copy that is in the
> __rpc_create_args global.  This error means we can't figure out what type
> __rpc_create_args is.
> 
> I'm unsure of how to fix this one.

Josh Stone helped develop a workaround for this one by initializing the 'args'
local variable even in the branch that doesn't use 'args'. See commit d7699f7.

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

--- Comment #7 from David Smith <dsmith at redhat dot com> 2011-12-16 15:36:16 UTC ---
(In reply to comment #4)
> The following set of errors are a bit bogus, but I'm not sure how to quiet
> them.
> 
> ====
> # stap -L '__scheduler.ctxswitch.kp'

Fixed in commit 5d9e97d by merging the scheduler.ctxswitch .kp and .tp probes.

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

--- Comment #8 from David Smith <dsmith at redhat dot com> 2011-12-16 17:41:53 UTC ---
This one happens because one branch doesn't define '__tsk':

# stap -L '__scheduler.process_exit.kp' > /dev/null
semantic error: unresolved type : identifier '__tsk' at
/usr/local/share/systemtap/tapset/scheduler.stp:388:3
        source:         __tsk = task_current()
                        ^
Fixed in commit df15ab5.

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

--- Comment #9 from David Smith <dsmith at redhat dot com> 2011-12-16 20:44:41 UTC ---
For RHEL6 (2.6.32-131.12.1.el6.x86_64.debug) I now see the following output:

====
# stap -L '**' > /dev/null
semantic error: not accessible at this address (0xffffffff814483dc, dieoffset:
0x3c69de1): identifier '$dev' at
/usr/local/share/systemtap/tapset/networking.stp:159:29
        source:     dev_name = get_netdev_name($dev)
                                               ^
semantic error: not accessible at this address (0xffffffff814483dc, dieoffset:
0x3c69dd8): identifier '$flags' at :160:10
        source:     flags = $flags
                            ^
semantic error: unresolved type : identifier 'flags' at :160:2
        source:     flags = $flags
====

The above set of errors is describe more fully in comment #3 and is caused by
systemtap being unable to find inlined function arguments.

This is probably as good as we can get for this kernel.

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13501

--- Comment #10 from David Smith <dsmith at redhat dot com> 2011-12-19 20:57:30 UTC ---
Here is my analysis of the results of 'stap -L "**" > /dev/null' on F16.  All
the failures have the same problem - systemtap can't find inlined function
arguments.

====
semantic error: unable to find local 'task' near pc 0x336e3  in  nfs_read_done
fs/nfs/proc.c ( (alternatives: $data): identifier '$task' at
/usr/local/share/systemtap/tapset/nfs_proc.stp:798:11
        source:     status = $task->tk_status
====

nfs.proc2.read_done - inline version missing $task

# stap -L 'module("nfs").function("nfs_read_done").*'
module("nfs").function("nfs_read_done@fs/nfs/proc.c:632").call $task:struct
rpc_task* $data:struct nfs_read_data*
module("nfs").function("nfs_read_done@fs/nfs/proc.c:632").inline $data:struct
nfs_read_data*
module("nfs").function("nfs_read_done@fs/nfs/proc.c:632").return $return:int
$task:struct rpc_task* $data:struct nfs_read_data*


====
semantic error: unable to find local 'task' near pc 0x33645  in  nfs_write_done
fs/nfs/proc.c ( (alternatives: $data): identifier '$task' at :1035:11
        source:     status = $task->tk_status
                             ^
====

nfs.proc2.write_done - inline version missing $task:

# stap -L 'module("nfs").function("nfs_write_done").*'
module("nfs").function("nfs_write_done@fs/nfs/proc.c:654").call $task:struct
rpc_task* $data:struct nfs_write_data*
module("nfs").function("nfs_write_done@fs/nfs/proc.c:654").inline $data:struct
nfs_write_data*
module("nfs").function("nfs_write_done@fs/nfs/proc.c:654").return $return:int
$task:struct rpc_task* $data:struct nfs_write_data*


====
semantic error: unable to find local 'task' near pc 0x3b0e3  in 
nfs3_write_done fs/nfs/nfs3proc.c ( (alternatives: $data): identifier '$task'
at :1066:11
        source:     status = $task->tk_status
====                             ^

nfs.proc3.write_done - inline version missing $task:

# stap -L 'module("nfs").function("nfs3_write_done").*'
module("nfs").function("nfs3_write_done@fs/nfs/nfs3proc.c:817").call
$task:struct rpc_task* $data:struct nfs_write_data*
module("nfs").function("nfs3_write_done@fs/nfs/nfs3proc.c:817").inline
$data:struct nfs_write_data*
module("nfs").function("nfs3_write_done@fs/nfs/nfs3proc.c:817").return
$return:int $task:struct rpc_task* $data:struct nfs_write_data*


====
semantic error: unable to find local 'rqstp' near pc 0x25e49  in  nfsd_open
fs/nfsd/vfs.c ( (alternatives: $filp $access $fhp): identifier '$rqstp' at
/usr/local/share/systemtap/tapset/nfsd.stp:996:33
        source:     client_ip = addr_from_rqst_str($rqstp)
                                                   ^
semantic error: unable to find local 'type' near pc 0x25e49  in  nfsd_open
fs/nfsd/vfs.c ( (alternatives: $filp $access $fhp): identifier '$type' at
:1000:9
        source:     type = $type
====

nfsd.open - inline version missing $rqstp, $type

# stap -L
'module("nfsd").function("nfsd_open").*'module("nfsd").function("nfsd_open@fs/nfsd/vfs.c:715").call
$rqstp:struct svc_rqst* $fhp:struct svc_fh* $type:int $access:int $filp:struct
file** $flags:int $host_err:int
module("nfsd").function("nfsd_open@fs/nfsd/vfs.c:715").exported $rqstp:struct
svc_rqst* $fhp:struct svc_fh* $type:int $access:int $filp:struct file**
$flags:int $host_err:int
module("nfsd").function("nfsd_open@fs/nfsd/vfs.c:715").inline $filp:struct
file** $access:int $fhp:struct svc_fh*
module("nfsd").function("nfsd_open@fs/nfsd/vfs.c:715").return $return:__be32
$rqstp:struct svc_rqst* $fhp:struct svc_fh* $type:int $access:int $filp:struct
file** $flags:int $host_err:int


====
semantic error: unable to find local 'signr' near pc 0xffffffff81013168  in 
handle_signal arch/x86/kernel/signal.c ( (alternatives: $regs $ka $info $sig):
identifier '$signr' at /usr/local/share/systemtap/tapset/signal.stp:606:15
        source:         sig = $signr
                              ^
semantic error: unable to find local 'signr' near pc 0xffffffff81013168  in 
handle_signal arch/x86/kernel/signal.c ( (alternatives: $regs $ka $info $sig):
identifier '$signr' at :607:33
        source:         sig_name = _signal_name($signr)
                                                ^
semantic error: not accessible at this address (0xffffffff81013168, dieoffset:
0x127bfc): identifier '$info' at :609:13
        source:     sinfo = $info
                            ^
semantic error: not accessible at this address (0xffffffff81013168, dieoffset:
0x127bfc): identifier '$info' at :610:16
        source:     sig_code = $info->si_code
                               ^
semantic error: not accessible at this address (0xffffffff81013168, dieoffset:
0x127bf3): identifier '$ka' at :611:15
        source:     ka_addr = $ka
                              ^
semantic error: unable to find local 'set' near pc 0xffffffff81013168  in 
handle_signal arch/x86/kernel/signal.c ( (alternatives: $regs $ka $info $sig):
identifier '$set' at :612:50
        source:     oldset_addr = (@defined($oldset) ? $oldset : $set)
                                                                 ^
semantic error: not accessible at this address (0xffffffff81013168, dieoffset:
0x127bea): identifier '$regs' at :613:12
        source:     regs = $regs
====

signal.handle - inlined function missing all args

# stap -L 'kernel.function("handle_*signal*").*'
kernel.function("handle_signal@arch/x86/kernel/signal.c:682").inline


====
semantic error: failed to retrieve location attribute for local 'clnt'
(dieoffset: 0x17132): identifier '$clnt' at
/usr/local/share/systemtap/tapset/rpc.stp:437:29
        source:     servername = kernel_string($clnt->cl_server)
                                               ^
semantic error: failed to retrieve location attribute for local 'clnt'
(dieoffset: 0x17132): identifier '$clnt' at :438:27
        source:     progname = kernel_string($clnt->cl_protname)
                                             ^
semantic error: failed to retrieve location attribute for local 'clnt'
(dieoffset: 0x17132): identifier '$clnt' at :439:24
        source:     prog = prog_from_clnt($clnt)
                                          ^
semantic error: failed to retrieve location attribute for local 'clnt'
(dieoffset: 0x17132): identifier '$clnt' at :440:24
        source:     vers = vers_from_clnt($clnt)
                                          ^
semantic error: failed to retrieve location attribute for local 'clnt'
(dieoffset: 0x17132): identifier '$clnt' at :441:24
        source:     prot = prot_from_clnt($clnt)
                                          ^
semantic error: failed to retrieve location attribute for local 'clnt'
(dieoffset: 0x17132): identifier '$clnt' at :442:24
        source:     port = port_from_clnt($clnt)
                                          ^
semantic error: failed to retrieve location attribute for local 'clnt'
(dieoffset: 0x17132): identifier '$clnt' at :443:23
        source:     xid  = xid_from_clnt($clnt)
                                         ^
semantic error: failed to retrieve location attribute for local 'clnt'
(dieoffset: 0x17132): identifier '$clnt' at :447:22
        source:            : (atomic_read(&$clnt->cl_count) == 0)))
                                           ^
semantic error: failed to retrieve location attribute for local 'msg'
(dieoffset: 0x1712c): identifier '$msg' at :449:23
        source:     proc = proc_from_msg($msg)
                                         ^
semantic error: failed to retrieve location attribute for local 'flags'
(dieoffset: 0x17126): identifier '$flags' at :454:10
        source:     flags = $flags
====

sunrpc.clnt.call_sync - inlined function missing all args

# stap -L 'module("sunrpc").function("rpc_call_sync").*'
module("sunrpc").function("rpc_call_sync@net/sunrpc/clnt.c:667").call
module("sunrpc").function("rpc_call_sync@net/sunrpc/clnt.c:667").exported
module("sunrpc").function("rpc_call_sync@net/sunrpc/clnt.c:667").return
$return:int

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[Bug tapsets/13501] Some arguments for 'stap -L "*, *.*, *.*.*" ' probe points not found

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13501

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |fche at redhat dot com
         Resolution|---                         |WORKSFORME

--- Comment #11 from Frank Ch. Eigler <fche at redhat dot com> ---
debuginfo quality gradually increases, but no stap bug/limitation evident here

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