Lukas Berk [Wed, 17 Aug 2011 20:36:04 +0000 (16:36 -0400)]
Initialize POD members that were previously uninitialized
* coveragedb.h: initialize type in coverage_element
* csclient.h: initialize argc in compile_server_client
* dwflpp.cxx: initialize blacklist_func, blacklist_func_ret,
and blacklist_file in dwflpp
* dwflpp.h: initialize entrypc in func_info
* elaborate.cxx: initialize num_newly_resolved, num_still_unresolved,
assert_resolvability and t in typeresolution_info
* session.cxx: initialize automatic_server_mode in systemtap_session
* staptree.cxx: initialize privileged in probe, tok in component,
and epilogue_style in probe_alias
* staptree.h: initialize num_index and expr_index in component
* tapset-utrace.cxx: initialize has_library in derived_probe
* tapsets.cxx: initialize has_process and has_library in
dwarf_derived_probe, has_library in base_query,
has_relative, relative_val, choose_next_line, and
entrypc_for_next_line in dwarf_query, op in
var_expanding_visitor and probe_type, probe_loc,
probe_scn_offset, probe_scn_addr, arg_count, base,
and semaphore in sdt_query
* translate.cxx: initialize action_counter and
probe_or_function_needs_deref_fault_handler in
c_unparser
Mark Wielaard [Wed, 17 Aug 2011 11:46:48 +0000 (13:46 +0200)]
PR6961 - backtrace from non-pt_regs probe context
When printing a kernel backtrace use the kernel dump_trace if available.
If the kernel is compiled with frame pointers we can guess the stack
pionter pretty reliably, otherwise let dump_stack figure it out and
skip some of the framework stack frames before starting the print the
remaining stack.
Josh Stone [Mon, 8 Aug 2011 20:54:06 +0000 (13:54 -0700)]
PR11209: Add cpu_clock and local_clock
This adds cpu_clock_ns(cpu), local_clock_ns(), and their coarser
variants. These are monotonic wallclock time sources, rather than the
absolute time-since-epoch sort. On kernels too old for these functions,
it falls back to stap's gettimeofday.
A kernel supports this only if it has the functions exported, and if it
is deemed new enough to have the patches that make it NMI-safe. See the
comment in timestamp_monotonic.stp for details.
* buildrun.cxx: Add export checks for cpu_clock and local_clock.
* tapset/timestamp_monotonic.stp: Define the new functions.
* testsuite/buildok/timestamp_monotonic-embedded.stp: Build them.
* doc/SystemTap_Tapset_Reference/tapsets.tmpl: Include the new docs.
'yes': Automatically download debuginfo - no timeout.
Also, if no value is given to the option, it
is the same as this.
'no': Do not automatically download debuginfo. Also
if the option is not specified at all, it
defaults to this.
'ask': Show output from abrt, including file size of
needed debuginfo, and make it wait for user
input before downloading.
'<number>' A positive number, in seconds, to represent
the timeout to use when downloading. If the
download takes longer than this, it will
abort the download.
**NOTE** Due to a few bugs in abrt, both the 'ask' feature
and the 'timeout' feature will not work properly. In terms
of the 'ask feature (BZ726192), it will ask the user, but
abrt then assumes 'yes' right away and continues the
download. When this is fixed in abrt, stap should function
properly. In terms of the timeout feature (BZ730107), stap
does stop if a timeout occurs, but the download process
continues to completion.
Mark Wielaard [Tue, 16 Aug 2011 15:37:27 +0000 (17:37 +0200)]
warn_overflow.exp: Add -DMAXSKIPPED=9999 to prevent false failures.
The syscall.* probe handlers try to overflow the cmd message buffers
which might take some time, so add -DMAXSKIPPED=9999 to not error
out because some probes take too long.
Mark Wielaard [Tue, 16 Aug 2011 12:31:29 +0000 (14:31 +0200)]
Reintroduce timer for transport cmd channel, don't wake_up unconditionally.
Revert parts of commit a85c8a "runtime/io.c: Explicitly signal setting of
_stp_exit_flag" and commit 46ac9e "Remove _stp_ctl_work_timer from module
transport layer". Introduce a new test wake_up.exp that shows a deadlock
when sending cmd messages and waking up the reader immediately.
Renamed _stp_ctl_write to _stp_ctl_send, which can be called from
everywhere. Rename _stp_ctl_send to _stp_ctl_send_notify that can be
called from user context in the transport layer itself (this will
immediately notify any readers). Document all places that use
_stp_ctl_send_notify directly to clarify why that is safe.
See http://sourceware.org/ml/systemtap/2011-q3/msg00163.html
Josh Stone [Tue, 16 Aug 2011 00:30:17 +0000 (17:30 -0700)]
Add a compat #define FIELD_SIZEOF
This was added in kernel 2.6.18. RHEL4 backported this definition, but
it was reported missing in another enterprise distro. It's an easy
one-line definition to add for compatibility though.
Mark Wielaard [Sun, 14 Aug 2011 21:07:46 +0000 (23:07 +0200)]
Implement and use select to wait for cmd channel data.
Add a poll implementation to runtime/transport/control.c
(_stp_ctl_poll_cmd) based on the _stp_ctl_ready_q wait queue.
Check whether select is supported in runtime/staprun/mainloop.c
(stp_main_loop) and use pselect with a sigmask that includes
SIGURG to get EINTR notifications whenever an interruptable
event occurred.
Mark Wielaard [Fri, 12 Aug 2011 17:34:20 +0000 (19:34 +0200)]
Remove _stp_ctl_work_timer from module transport layer.
The _stp_ctl_work_timer would trigger every 20ms to check whether
there were cmd messages queued, but not announced yet and to
check the _stp_exit_flag was set.
This commit makes all control messages announce themselves and
check the _stp_exit_flag in the _stp_ctl_read_cmd loop (delivery
is still possibly delayed since the messages are just pushed on
a wait queue).
Josh Stone [Thu, 11 Aug 2011 21:30:05 +0000 (14:30 -0700)]
Fix the uprobes.ko path when used with remotes
When uprobes.ko is sent through stapsh, it will go in a temp path that
only stapsh knows. However, we were sending -u/path/to/uprobes.ko with
a client side path, which would only work for --remote localhost. :/
Now the path is sanitized to ./ for the stapsh working directory.
* buildrun.cxx (make_run_command): Take a remotedir instead of a module
name. When set, use it to normalize both the uprobes and module path.
Also check versions that a uprobes path is even supported (>=1.4).
* remote.cxx (stapsh::start): The remotedir is simply "." for stapsh.
(ssh_legacy_remote:start): The remotedir is the known from the prior
mktemp -d. Also start sending the module signature across, add a note
why we unfortunately can't send uprobes in legacy mode, and specify
the staprun command without any path in case the remote is different.
Mark Wielaard [Thu, 11 Aug 2011 16:53:01 +0000 (18:53 +0200)]
Be more explicit about when the session needs symbol data. pragma:symbols.
Introduce /* pragma:symbols */ which is added to those tapset functions
that use print_addr or print_stack with symbol resolving. Now we no longer
have to output the symbol tables at translate time if unnecessary.
Although we could do even less work (see the new comment in translate.cxx).
Mark Wielaard [Thu, 11 Aug 2011 10:34:01 +0000 (12:34 +0200)]
Only collect and emit unwind data in translator if the session needs it.
When we hit the translator the session already knows whether or not it
will possibly need the unwind data. Only collect and emit it, if the
session does. This can save writing out tens of MB to stap-symbols.h
for simple scripts that never call any backtrace() function.
Chris Meek [Thu, 4 Aug 2011 14:11:38 +0000 (10:11 -0400)]
PR12773: Use abrt to download and install debuginfo
dwflpp.cxx
In setup_user(), pass the session to setup_dwfl_user().
setupdwfl.cxx
Added internal_find_debuginfo() and
execute_abrt_action_install_debuginfo_to_abrt_cache() to call
abrt to automatically download and install the needed debuginfo.
setupdwfl.h
Added function declarations.
util.h
Added hex_dump() to convert a binary string to a hex string.
Mark Wielaard [Mon, 8 Aug 2011 09:08:42 +0000 (11:08 +0200)]
sdt*exp: When the compiler doesn't recognize flag, mark test as UNTESTED.
Older gcc compilers don't recognize all the -std=[c|gnu]++0x flags we
throw at them. Instead of marking these compilations as FAIL, mark them
as UNTESTED now, so we only see real FAILures in the result (there are
still a couple left against -pedantic).
Mark Wielaard [Sun, 7 Aug 2011 13:44:58 +0000 (15:44 +0200)]
Add NULL context when creating perf event counter, remove nmi from handler.
More fallout of kernel commit 4dc0da "perf: Add context field to perf_event"
and commit a8b0ca "perf: Remove the nmi parameter from the swevent and
verflow interface". And new autoconf checks for both.
Mark Wielaard [Fri, 5 Aug 2011 12:13:21 +0000 (14:13 +0200)]
Check for hw_breakpoint context argument.
Kernel commit 4dc0da8 "perf: Add context field to perf_event" added
a new void *context field to the register_*_hw_breakpoint() functions.
Detect with a new runtime/autoconf-hw_breakpoint_context.c plus
STAPCONF_HW_BREAKPOINT_CONTEXT conditional.
Mark Wielaard [Thu, 4 Aug 2011 10:24:35 +0000 (12:24 +0200)]
Use $dfd not $mode in testsuite/transok/tval-opt.stp.
Kernel commit 47c805 "switch do_filp_open() to struct open_flags"
changed the arguments of do_filp_open. Use another int argument
that hasn't changed in testcase.
Mark Wielaard [Wed, 3 Aug 2011 22:26:49 +0000 (00:26 +0200)]
Check whether syscalls2.stp sigprocmask argument is set or nset.
kernel commit b013c3 "signal: cleanup sys_sigprocmask()" renamed the set
parameter to nset. commit bb7efe "signal: cleanup sys_rt_sigprocmask()"
did the same. Check with @defined($set) to see if we want the old or
new definition.
Mark Wielaard [Wed, 3 Aug 2011 17:30:37 +0000 (19:30 +0200)]
testsuite warn_overflow be more precise and a bit more lenient.
log exactly once for syscall probe hit and counter i == 256.
But do allow more than 3 overflow warning messages to occur
in case stap miraculously recovers and overflows immediately
afterwards.
Mark Wielaard [Wed, 3 Aug 2011 09:17:00 +0000 (11:17 +0200)]
common_probe_context.h: Put Individual Probe State (ips) into a union.
Various probe handlers have dedicated fields in the common probe context
struct. Since the handlers cannot be active at the same time (on the same
cpu) these can just be put into a union to save space. In runtime code
when there might be ambiguity about which probe handler is running, the
CONTEXT->probe_type field can be used to check which field has actual
life data.
Mark Wielaard [Tue, 2 Aug 2011 14:42:38 +0000 (16:42 +0200)]
Add probe_type to common probe context.
This exposes the type of probe handler for use in runtime functions,
so they can better anticipate which common probe context is valid at
runtime. Also introduces a new context tapset function probe_type()
that exposes a (informational) probe handler string to scripts. Mainly
useful for debugging, when the user wants to find out which kind of
low level probe handler a high-level probe translates to for a particular
kernel/systemtap version.
Josh Stone [Mon, 1 Aug 2011 18:58:36 +0000 (11:58 -0700)]
PR12135: Prefer subclass members if they mask the superclass
* dwflpp.cxx (dwflpp::find_struct_member): Use a breadth-first search
through inheritance trees, so masked members will be pulled from the
subclass rather than the superclass.
* testsuite/systemtap.base/inherit.*: New test for inheritance games.
Mark Wielaard [Mon, 1 Aug 2011 14:00:05 +0000 (16:00 +0200)]
Probe context data field is only used for procfs. Rename to procfs_data.
itrace and mark probes would also scribble (useless) data into this
context field, without ever using it, for no apparent reason, except
that they had "data" around. Renamed the field to procfs_data to make
clear it has a specific purpose.
Also add documentation for remaining undocumented common_probe_context fields.
Mark Wielaard [Mon, 1 Aug 2011 10:39:36 +0000 (12:39 +0200)]
Only add probe_name to the common probe context when really needed.
Guard probe_name with STP_NEED_PROBE_NAME. It is only needed when we include
the pn() tapset function. All this needed was moving the STP_NEED_PROBE_NAME
define from the tapset function to a top-level embedded C block (which are
included early, unlike the tapset functions themselves).
Also document common_probe_context.h busy, probe_point and probe_name fields.
Mark Wielaard [Fri, 29 Jul 2011 11:35:06 +0000 (13:35 +0200)]
Put common probe and session context state definitions in their own files.
translate.cxx contained code to produce the common probe and session
context state as C code snippets. Large parts were not dependent on the
session state at all, so they really were just static blobs of C code
wrapped in c++ io stream operators. These have been put in their own
C runtime header files (common_session_state.h, common_probe_context.h
and runtime_defines.h) to make it easier to edit and document.
Mark Wielaard [Thu, 28 Jul 2011 16:10:20 +0000 (18:10 +0200)]
Guard regparm in probe context with STAP_NEED_REGPARM.
regparm is only used on i386 (and x86_64 when probing 32bit) for
signaling what the parameter packing is for the probed function
as set in register.stp. So only include it in the probe context
struct when actually used in a stap script.
Also updated docs and fixed signature on other arches.
Mark Wielaard [Thu, 28 Jul 2011 12:02:09 +0000 (14:02 +0200)]
PR13037 Make lock blacklist more specific.
The dwflpp::build_blacklist() would also match things like _nolock,
block or clock. Be more specific that we want to only match things
like _lock, _unlock, _trylock or seq[un]lock.
David Smith [Wed, 27 Jul 2011 17:32:50 +0000 (12:32 -0500)]
Two task_finder cleanups.
* runtime/task_finder.c: Two cleanup fixes. Merged 2 different state
variables into 1. Reversed utrace compatibility fix. Instead of
making new utrace look like old utrace, made old utrace look like new
utrace (i.e. use 'utrace_engine' instead of 'utrace_attached_engine').
* runtime/utrace_compatibility.h: Reversed utrace compatibility fix (use
'utrace_engine' instead of 'utrace_attached_engine').
Mark Wielaard [Tue, 26 Jul 2011 21:31:01 +0000 (23:31 +0200)]
Allow gcc to optimize away uprobe_get_pc() calls in some situations.
If a call is made to the stack-x86.c __stp_stack_print() it might
try to call uprobe_get_pc(). If this is just a kernel backtrace
then uprobes might not be loaded. Add a hint by explicitly clearing
the struct uretprobe_instance *ri variable in that cass in the
calling function _stp_stack_print() in stack.c, so that gcc
optimizes away the uprobe_get_pc() call, so that the symbol isn't
in the module anymore.
Would cause issues like:
WARNING: "uprobe_get_pc" [stap_d46895_3786.ko] undefined!
Error inserting module 'stap_d46895_3786.ko': Unknown symbol in module