[Bug 241137] Base lldb 9 crashes compared to devel/llvm90

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[Bug 241137] Base lldb 9 crashes compared to devel/llvm90

bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241137

            Bug ID: 241137
           Summary: Base lldb 9 crashes compared to devel/llvm90
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-qa
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: [hidden email]
          Reporter: [hidden email]

Install /projects/clang900-import then

$ lldb $(which true)
(lldb) target create "/usr/bin/true"
Current executable set to '/usr/bin/true' (x86_64).
(lldb) run
Expected<T> must be checked before access or destruction.
Expected<T> value was in success state. (Note: Expected<T> values in success
mode must still be checked prior to being destroyed).
#0 0x0000000003af08fe PrintStackTrace
/usr/src/contrib/llvm/lib/Support/Unix/Signals.inc:533:13
#1 0x0000000003aeeac7 RunSignalHandlers
/usr/src/contrib/llvm/lib/Support/Signals.cpp:69:18
#2 0x0000000003af0fe2 SignalHandler
/usr/src/contrib/llvm/lib/Support/Unix/Signals.inc:0:3
#3 0x0000000804743390 handle_signal /usr/src/lib/libthr/thread/thr_sig.c:0:3
Stack dump:
0.      Program arguments: lldb /usr/bin/true
1.      HandleCommand(command = "run")
Abort trap

Thread 1 received signal SIGABRT, Aborted.
thr_kill () at thr_kill.S:4
4       thr_kill.S: No such file or directory.
(gdb) info threads
  Id   Target Id                                     Frame
* 1    LWP 101271 of process 51644                   thr_kill () at
thr_kill.S:4
  3    LWP 101144 of process 51644 "dbg.evt-handler" _umtx_op_err ()
    at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
(gdb) thread apply all bt full

Thread 3 (LWP 101144 of process 51644):
#0  _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
No locals.
#1  0x000000080473f670 in _thr_umtx_timedwait_uint (mtx=0x805558020,
id=<optimized out>, clockid=<optimized out>, abstime=<optimized out>,
shared=<optimized out>) at /usr/src/lib/libthr/thread/thr_umtx.c:236
        tm_size = <optimized out>
        tm_p = <optimized out>
        timeout = <optimized out>
#2  0x000000080474948b in cond_wait_user (cvp=<optimized out>, mp=<optimized
out>, abstime=0x0, cancel=1) at /usr/src/lib/libthr/thread/thr_cond.c:320
        curthread = 0x805527e00
        deferred = <optimized out>
        recurse = 0
        error = <optimized out>
        sq = <optimized out>
        error2 = <optimized out>
#3  cond_wait_common (cond=<optimized out>, mutex=<optimized out>, abstime=0x0,
cancel=1) at /usr/src/lib/libthr/thread/thr_cond.c:380
        curthread = <optimized out>
        cvp = 0x80559c040
        mp = 0x804d2dc88
        error = <optimized out>
#4  0x00000008047f8002 in std::__1::__libcpp_condvar_wait (__cv=0x805558020,
__m=0xf) at /usr/src/contrib/libc++/include/__threading_support:295
No locals.
#5  std::__1::condition_variable::wait (this=0x805558020, lk=...) at
/usr/src/contrib/libc++/src/condition_variable.cpp:44
        ec = <optimized out>
#6  0x0000000001aba4ab in GetEventInternal () at
/usr/src/contrib/llvm/tools/lldb/source/Utility/Listener.cpp:363
No locals.
e::Timeout<std::__1::ratio<1l, 1000000l> > const&) () at
/usr/src/contrib/llvm/tools/lldb/source/Utility/Listener.cpp:400
No locals.
#8  0x00000000019c6138 in DefaultEventHandler () at
/usr/src/contrib/llvm/tools/lldb/source/Core/Debugger.cpp:1572
No locals.
#9  0x00000000019c6439 in lldb_private::Debugger::EventHandlerThread(void*) ()
at /usr/src/contrib/llvm/tools/lldb/source/Core/Debugger.cpp:1625
No locals.
#10 0x0000000001f1a800 in ThreadCreateTrampoline () at
/usr/src/contrib/llvm/tools/lldb/source/Host/common/HostNativeThreadBase.cpp:69
No locals.
#11 0x000000080473d716 in thread_start (curthread=0x805527e00) at
/usr/src/lib/libthr/thread/thr_create.c:291
        set = <optimized out>
#12 0x0000000000000000 in ?? ()
No symbol table info available.
Backtrace stopped: Cannot access memory at address 0x7fffdf7fd000

Thread 1 (LWP 101271 of process 51644):
#0  thr_kill () at thr_kill.S:4
No locals.
#1  0x0000000804a62e64 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52
        id = 101271
#2  0x00000008049d6de9 in abort () at /usr/src/lib/libc/stdlib/abort.c:67
        act = <optimized out>
#3  0x00000000019c7dc2 in fatalUncheckedExpected () at
/usr/src/contrib/llvm/include/llvm/Support/Error.h:664
No locals.
#4  0x0000000001e16569 in assertIsChecked () at
/usr/src/contrib/llvm/include/llvm/Support/Error.h:671
No locals.
#5  operator-> () at /usr/src/contrib/llvm/include/llvm/Support/Error.h:561
No locals.
#6  StartLaunchOpThread () at
/usr/src/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp:792
No locals.
#7  0x0000000001e16262 in ProcessMonitor () at
/usr/src/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp:721
No locals.
#8  0x0000000001e11477 in DoLaunch () at
/usr/src/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.cpp:400
No locals.
#9  0x00000000019edb9f in Launch () at
/usr/src/contrib/llvm/tools/lldb/source/Target/Process.cpp:2579
No locals.
#10 0x0000000001a29a2c in Launch () at
/usr/src/contrib/llvm/tools/lldb/source/Target/Target.cpp:2905
No locals.
#11 0x0000000001b43f70 in DoExecute () at
/usr/src/contrib/llvm/tools/lldb/source/Commands/CommandObjectProcess.cpp:221
No locals.
#12 0x0000000001a7eb01 in Execute () at
/usr/src/contrib/llvm/tools/lldb/source/Interpreter/CommandObject.cpp:972
No locals.
#13 0x0000000001a73e03 in HandleCommand () at
/usr/src/contrib/llvm/tools/lldb/source/Interpreter/CommandInterpreter.cpp:1779
No locals.
#14 0x0000000001a77553 in IOHandlerInputComplete () at
/usr/src/contrib/llvm/tools/lldb/source/Interpreter/CommandInterpreter.cpp:2828
No locals.
#15 0x0000000001a8d3dc in Run () at
/usr/src/contrib/llvm/tools/lldb/source/Core/IOHandler.cpp:577
No locals.
#16 0x00000000019c3f5a in ExecuteIOHandlers () at
/usr/src/contrib/llvm/tools/lldb/source/Core/Debugger.cpp:995
No locals.
source/Interpreter/CommandInterpreter.cpp:3039
No locals.
#18 0x0000000001da631d in RunCommandInterpreter () at
/usr/src/contrib/llvm/tools/lldb/source/API/SBDebugger.cpp:1103
No locals.
#19 0x0000000001925b16 in MainLoop () at
/usr/src/contrib/llvm/tools/lldb/tools/driver/Driver.cpp:682
No locals.
#20 0x0000000001926a29 in main () at
/usr/src/contrib/llvm/tools/lldb/tools/driver/Driver.cpp:889
No locals.
(gdb) frame 6
#6  StartLaunchOpThread ()
    at
/usr/src/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp:792
792       if (m_operation_thread->IsJoinable())
(gdb) list
787
788     // Thread setup and tear down.
789     void ProcessMonitor::StartLaunchOpThread(LaunchArgs *args, Status
&error) {
790       static const char *g_thread_name = "freebsd.op";
791
792       if (m_operation_thread->IsJoinable())
793         return;
794
795       m_operation_thread =
796           ThreadLauncher::LaunchThread(g_thread_name, LaunchOpThread,
args);
(gdb) print m_operation_thread
No symbol "m_operation_thread" in current context.

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[Bug 241137] Base lldb 9 crashes compared to devel/llvm90

bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241137

--- Comment #1 from [hidden email] ---
A commit references this bug:

Author: dim
Date: Wed Oct  9 19:51:42 UTC 2019
New revision: 353363
URL: https://svnweb.freebsd.org/changeset/base/353363

Log:
  Put in a band-aid fix for lldb 9 exiting with "Expected<T> must be
  checked before access or destruction" when launching executables, while
  we sort this out with upstream.

  Reported by:  jbeich
  PR:           241137
  MFC after:    1 month
  X-MFC-With:   r353358

Changes:
 
head/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
  head/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.h

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[Bug 241137] Base lldb 9 crashes compared to devel/llvm90

bugzilla-noreply
In reply to this post by bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241137

--- Comment #2 from [hidden email] ---
A commit references this bug:

Author: dim
Date: Thu Oct 10 20:30:55 UTC 2019
New revision: 353415
URL: https://svnweb.freebsd.org/changeset/base/353415

Log:
  Revert r353363 in preparation for applying upstream fix:

  Put in a band-aid fix for lldb 9 exiting with "Expected<T> must be
  checked before access or destruction" when launching executables, while
  we sort this out with upstream.

  PR:           241137
  MFC after:    1 month
  X-MFC-With:   r353358

Changes:
 
head/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
  head/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.h

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[Bug 241137] Base lldb 9 crashes compared to devel/llvm90

bugzilla-noreply
In reply to this post by bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241137

--- Comment #3 from [hidden email] ---
A commit references this bug:

Author: dim
Date: Thu Oct 10 20:33:56 UTC 2019
New revision: 353416
URL: https://svnweb.freebsd.org/changeset/base/353416

Log:
  Pull in r374444 from upstream lldb trunk (by me):

    Fix process launch failure on FreeBSD after r365761

    Summary:
    After rLLDB365761, and with `LLVM_ENABLE_ABI_BREAKING_CHECKS`
    enabled, launching any process on FreeBSD crashes lldb with:

    ```
    Expected<T> must be checked before access or destruction.
    Expected<T> value was in success state. (Note: Expected<T> values in
    success mode must still be checked prior to being destroyed).
    ```

    This is because `m_operation_thread` and `m_monitor_thread` were
    wrapped in `llvm::Expected<>`, but this requires the objects to be
    correctly initialized before accessing them.

    To fix the crashes, use `llvm::Optional<>` for the members (as
    indicated by labath), and use local variables to store the return
    values of `LaunchThread` and `StartMonitoringChildProcess`.  Then,
    only assign to the member variables after checking if the return
    values indicated success.

    Reviewers: devnexen, emaste, MaskRay, mgorny

    Reviewed By: devnexen

    Subscribers: jfb, labath, krytarowski, lldb-commits

    Differential Revision: https://reviews.llvm.org/D68723

  PR:           241137
  MFC after:    1 month
  X-MFC-With:   r353358

Changes:
 
head/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
  head/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.h

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