[Lldb-commits] [lldb] r202086 - Fixed the command line LLDB so that "CTRL+C" will interrupt a running process again.

[Ed Maste]

On 24 February 2014 17:50, Greg Clayton <gclayton at apple.com> wrote:
>
> Author: gclayton
> Date: Mon Feb 24 16:50:57 2014
> New Revision: 202086
>
> URL: http://llvm.org/viewvc/llvm-project?rev=202086&view=rev
> Log:
> Fixed the command line LLDB so that "CTRL+C" will interrupt a running process again.

Hi Greg,

After this change LLDB dies on an assertion in the thread library for
me when I hit ^C:

joule% bin/lldb /bin/sleep 60
Current executable set to '/bin/sleep' (x86_64).
(lldb) run
Process 2607 launching
Process 2607 stopped
(lldb) Process 2607 launched: '/bin/sleep' (x86_64)
<Ctrl+C>
Fatal error 'thread was already on queue.' at line 223 in file
/tank/emaste/src/freebsd/lib/libthr/thread/thr_cond.c (errno = 0)
zsh: abort (core dumped)  bin/lldb /bin/sleep 60

This seems to be the same issue originally discussed in
http://lists.cs.uiuc.edu/pipermail/lldb-dev/2013-June/001895.html .
The backtrace looks like this:

    frame #1: 0x000000080715fff9 libc.so.7`abort + 73 at abort.c:65
    frame #2: 0x0000000805d20fda
libthr.so.3`_thread_exit(fname=<unavailable>, lineno=<unavailable>,
msg=<unavailable>) + 58 at thr_exit.c:182
    frame #3: 0x0000000805d1fdc8 libthr.so.3`cond_wait_common
[inlined] cond_wait_user(mp=<unavailable>, abstime=<unavailable>,
cancel=<unavailable>) + 936 at thr_cond.c:223
    frame #4: 0x0000000805d1fd5b
libthr.so.3`cond_wait_common(cond=<unavailable>, mutex=<unavailable>,
abstime=<unavailable>, cancel=<unavailable>) + 827 at thr_cond.c:311
    frame #5: 0x00000008013450b5
liblldb.so.3.5`lldb_private::Condition::Wait(lldb_private::Mutex&,
lldb_private::TimeValue const*, bool*) + 117
    frame #6: 0x00000008013411e8
liblldb.so.3.5`lldb_private::Predicate<bool>::WaitForValueEqualTo(bool,
lldb_private::TimeValue const*, bool*) + 200
    frame #7: 0x00000008013eb34c
liblldb.so.3.5`lldb_private::Listener::WaitForEventsInternal(lldb_private::TimeValue
const*, lldb_private::Broadcaster*, lldb_private::ConstString const*,
unsigned int, unsigned int,
std::__1::shared_ptr<lldb_private::Event>&) + 876
    frame #8: 0x00000008013eb751
liblldb.so.3.5`lldb_private::Listener::WaitForEvent(lldb_private::TimeValue
const*, std::__1::shared_ptr<lldb_private::Event>&) + 81
    frame #9: 0x00000008017c5bcf
liblldb.so.3.5`lldb_private::Process::Halt(bool) + 783
    frame #10: 0x00000008017def3a
liblldb.so.3.5`IOHandlerProcessSTDIO::Interrupt() + 74
    frame #11: 0x00000008013823d3
liblldb.so.3.5`lldb_private::Debugger::DispatchInputInterrupt() + 115
    frame #12: 0x00000008011d69c5
liblldb.so.3.5`lldb::SBDebugger::DispatchInputInterrupt() + 69
    frame #13: 0x000000000040b254 lldb`sigint_handler(int) + 68
    frame #14: 0x0000000805d1b3da
libthr.so.3`handle_signal(actp=<unavailable>, sig=<unavailable>,
info=<unavailable>, ucp=<unavailable>) + 234 at thr_sig.c:240
    frame #15: 0x0000000805d1afc2
libthr.so.3`thr_sighandler(sig=<unavailable>, info=<unavailable>,
_ucp=<unavailable>) + 306 at thr_sig.c:183
    frame #16: 0x00007ffffffff003
    frame #17: 0x0000000805d1fc7e libthr.so.3`cond_wait_common
[inlined] cond_wait_user(mp=<unavailable>, abstime=<unavailable>,
cancel=1) + 239 at thr_cond.c:255
    frame #18: 0x0000000805d1fb8f
libthr.so.3`cond_wait_common(cond=<unavailable>, mutex=<unavailable>,
abstime=0x0000000000000000, cancel=1) + 367 at thr_cond.c:311
    frame #19: 0x00000008013450d2
liblldb.so.3.5`lldb_private::Condition::Wait(lldb_private::Mutex&,
lldb_private::TimeValue const*, bool*) + 146
    frame #20: 0x00000008013411e8
liblldb.so.3.5`lldb_private::Predicate<bool>::WaitForValueEqualTo(bool,
lldb_private::TimeValue const*, bool*) + 200
    frame #21: 0x00000008013eb34c
liblldb.so.3.5`lldb_private::Listener::WaitForEventsInternal(lldb_private::TimeValue
const*, lldb_private::Broadcaster*, lldb_private::ConstString const*,
unsigned int, unsigned int,
std::__1::shared_ptr<lldb_private::Event>&) + 876
    frame #22: 0x00000008013eb751
liblldb.so.3.5`lldb_private::Listener::WaitForEvent(lldb_private::TimeValue
const*, std::__1::shared_ptr<lldb_private::Event>&) + 81
    frame #23: 0x00000008017b8acc
liblldb.so.3.5`lldb_private::Process::WaitForEventsPrivate(lldb_private::TimeValue
const*, std::__1::shared_ptr<lldb_private::Event>&, bool) + 188
    frame #24: 0x00000008017c71e3
liblldb.so.3.5`lldb_private::Process::RunPrivateStateThread() + 227
    frame #25: 0x00000008017c6abd
liblldb.so.3.5`lldb_private::Process::PrivateStateThread(void*) + 29
    frame #26: 0x000000080133a25a
liblldb.so.3.5`ThreadCreateTrampoline(void*) + 394
    frame #27: 0x0000000805d16455
libthr.so.3`thread_start(curthread=0x00000008086d5000) + 277 at
thr_create.c:284