Re: [Bug-apl] Segmentation fault

[Juergen Sauermann]

Hi Blake,

0x86 is the culprit because the first byte of a non-ASCII UTF8 should be 
11xx xxxx in binary.

I have changde the code so that the sequence is truncated after printing
the Bad UTF message and the stack trace and no assertion is thrown, SVN 227.

/// Jürgen


On 04/27/2014 04:28 AM, Blake McBride wrote:
> I hit some bad keys on the keyboard while attempting to get rid of a 
> SI and ended up with a segmentation fault.  Here is what happened:
>
> Note:  WS test was not saved with a SI.  It has a ⎕LX that causes a 
> function named auto to execute.  auto, in turn, attempted to call a 
> function named start that does not exist.  So, the initial error 
> (VALUE ERROR) is expected.  While attempting to pop the SI I hit some 
> other keys accidentally and got the segmentation fault.
>
>
>       )load test
> SAVED 2014-4-27  1:46:48 (GMT-5)
> VALUE ERROR
> auto[11]  start
>           ^
>       asdg��→
> Bad UTF8 string: 0x61 0x73 0x64 0x67 0x86 0x92 0xE2 0x86 0x92 at 
> UCS_string.cc:65
>
> ----------------------------------------
> -- Stack trace at UCS_string.cc:66
> ----------------------------------------
> 0x7f25b214bde5 __libc_start_main
> 0x434f8d  main
> 0x52682d   Workspace::immediate_execution(bool)
> 0x462bbd    Command::process_line()
> 0x475793     Input::get_line()
> 0x50b4d5      UCS_string::UCS_string(UTF8_string const&)
> ========================================
>
> ==============================================================================
> Assertion failed: 0 && "Error in UCS_string::UCS_string()"
> in Function:      UCS_string
> in file:          UCS_string.cc:67
>
> Call stack:
>
> ----------------------------------------
> -- Stack trace at UCS_string.cc:67
> ----------------------------------------
> 0x7f25b214bde5 __libc_start_main
> 0x434f8d  main
> 0x52682d   Workspace::immediate_execution(bool)
> 0x462bbd    Command::process_line()
> 0x475793     Input::get_line()
> 0x50b4ee      UCS_string::UCS_string(UTF8_string const&)
> 0x44345f       do_Assert(char const*, char const*, char const*, int)
> ========================================
>
> SI stack:
>
> Depth:    1
> Exec:     0xc558c8
> Pmode:    ∇ auto[11]
> PC:       58 ENDL
> Stat:     start
> err_code: 0x30001
> thrown:   at Symbol.cc:679
> e_msg_1:  'VALUE ERROR'
> e_msg_2:  'auto[11]  start'
> e_msg_3:  '          ^'
>
> Depth:    0
> Exec:     0xc38d40
> Pmode:    ◊  auto
> PC:       1 ENDL
> Stat:     auto
> err_code: 0x0
> thrown:   at StateIndicator.cc:40
> e_msg_1:  'No Error'
> e_msg_2:  ''
> e_msg_3:  ''
>
>
> ==============================================================================
>
>
> ====================================================
> SEGMENTATION FAULT
>
> ----------------------------------------
> -- Stack trace at main.cc:121
> ----------------------------------------
> 0x7f25b214bde5 __libc_start_main
> 0x434f8d  main
> 0x52682d   Workspace::immediate_execution(bool)
> 0x462bbd    Command::process_line()
> 0x475793     Input::get_line()
> 0x50b4ee      UCS_string::UCS_string(UTF8_string const&)
> 0x443407       do_Assert(char const*, char const*, char const*, int)
> 0x4ff0be        TestFiles::assert_error()
> 0x7f25b39a5bb0
> 0x47973a
> ========================================
> ====================================================
> Segmentation fault