[R-SIG-Mac] R segfault at startup, causing R crash

[Brandon Hurr]

I have also had this issue since upgrading. Recently it's got so bad that I
just hit escape and continue working while saving my script as often as I
can remember in hopes that it doesn't freeze completely.

I deleted my script history as mentioned and indeed it prevented it from
coming up with the error until I opened about 3 files and then it started
again.

As Kevin suggested I opened it with libd and recorded the following. When
it loaded with libd it caught something and loaded R normally without an
error. I opened the same file and it "crashed" again. I reopened with libd
and it caught another similar error (below).

Brandons-iMac:~ brandonhurr$  /usr/bin/lldb -w -n R
(lldb) process attach --name "R" --waitfor
Process 1439 stopped
* thread #1: tid = 0xf4c6, 0x000000011bb96ef6
dyld`ImageLoaderMachO::libPath(unsigned int) const + 118, queue =
'com.apple.main-thread', stop reason = signal SIGSTOP
    frame #0: 0x000000011bb96ef6 dyld`ImageLoaderMachO::libPath(unsigned
int) const + 118
dyld`ImageLoaderMachO::libPath:
->  0x11bb96ef6 <+118>: movl   0x8(%rdx), %eax
    0x11bb96ef9 <+121>: addq   %rdx, %rax
    0x11bb96efc <+124>: addq   $0x8, %rsp
    0x11bb96f00 <+128>: popq   %rbx

Executable module set to "/Applications/R.app/Contents/MacOS/R".
Architecture set to: x86_64h-apple-macosx.
(lldb) c
Process 1439 resuming

#### second time
Brandons-iMac:~ brandonhurr$  /usr/bin/lldb -w -n R
(lldb) process attach --name "R" --waitfor
Process 1467 stopped
* thread #1: tid = 0xfa9f, 0x00007fff8c32a401
libobjc.A.dylib`objc_opt::objc_clsopt_t::getClassAndHeader(char const*,
void*&, void*&) const + 49, queue = 'com.apple.main-thread', stop reason =
signal SIGSTOP
    frame #0: 0x00007fff8c32a401
libobjc.A.dylib`objc_opt::objc_clsopt_t::getClassAndHeader(char const*,
void*&, void*&) const + 49
libobjc.A.dylib`objc_opt::objc_clsopt_t::getClassAndHeader:
->  0x7fff8c32a401 <+49>: movslq 0x420(%rax,%rcx,8), %rax
    0x7fff8c32a409 <+57>: testb  $0x1, %al
    0x7fff8c32a40b <+59>: jne    0x7fff8c32a43f            ; <+111>
    0x7fff8c32a40d <+61>: leaq   0x420(%rsi,%rdx,4), %rdx

Executable module set to "/Applications/R.app/Contents/MacOS/R".
Architecture set to: x86_64h-apple-macosx.
(lldb) c
Process 1467 resuming

#### third time
Brandons-iMac:~ brandonhurr$  /usr/bin/lldb -w -n R
(lldb) process attach --name "R" --waitfor
Process 1486 stopped
* thread #1: tid = 0xfd29, 0x000000010f4dc429 dyld`strrchr, queue =
'com.apple.main-thread', stop reason = signal SIGSTOP
    frame #0: 0x000000010f4dc429 dyld`strrchr
dyld`strrchr:
->  0x10f4dc429 <+0>: pushq  %rbp
    0x10f4dc42a <+1>: movq   %rsp, %rbp
    0x10f4dc42d <+4>: movsbl %sil, %ecx
    0x10f4dc431 <+8>: xorl   %eax, %eax

Executable module set to "/Applications/R.app/Contents/MacOS/R".
Architecture set to: x86_64h-apple-macosx.
(lldb) c
Process 1486 resuming


I hope that is helpful.

B

P.S. I will upgrade to 3.3.2 shortly so this may be resolved with that.


On Sat, Nov 5, 2016 at 5:08 PM, Kevin Ushey <kevinushey at gmail.com> wrote:

> /usr/bin/lldb -w -n R

	[[alternative HTML version deleted]]