Child crashes when scrollback buffer is full and new process started which tries to manipulate screen buffer

[garethhumphriesacc]

I'm not 100% sure where to file this one - could be console or cygwin. Since I can't reproduce it outside of console I'm going to start here.

Issue is this: once my scrollback buffer is full, the next time I run a program like vim or less, which attempts to manipulate the screen buffer (eg by moving the cursor, clearing content etc), the program does a malloc which fails and the process crashes.

1 [main] vim 15304 C:\Cygwin\bin\vim.exe: *** fatal error - cmalloc would have returned NULL

I can reproduce in a cygwin prompt in consolez by generating enough output to fill the buffer, then running vi. I cannot reproduce in a normal (ie cmd) cygwin window with the same process.

My buffer is set to the maximum size of 32766 lines.

Stackdump and diagnostics below. Happy to provide any other info that may useful.

Stack trace:

Frame        Function    Args
00180000000  0018005F64E (0018022DAEE, 0018022E0D9, 000FFFFC5B0, 000FFFFB740)
00180000000  00180048869 (C0C0C000008080, FF000000808080, FFFF000000FF00, 00000EDFC48)
00180000000  001800488A2 (0018022DACB, 000FFFFC4A8, 000FFFFC5B0, 80808000C0C0C0)
00180000000  001800454B3 (00000000000, 00180000000, 7FFD23EFBC0E, 001800004EC)
00180000000  0018006D2F1 (C0C0C000008080, FF000000808080, FFFF000000FF00, FF00FF000000FF)
00180000000  0018006E17E (00000000000, 00000000000, 00000000000, 00000000000)
00180000000  00180070114 (00000000000, 00000000008, 00000000000, 00000000000)
001802FAA90  00180136D51 (00100674560, 00000000008, 00000000000, 00000000000)
001802FAA90  0018011D81B (00100674560, 00000000008, 00000000000, 00000000000)
001802FAA90  001004FE1B4 (0010057EB4A, 00000000000, 001802FAA90, 0010067AF5C)
001802FAA90  0010058CD73 (00100000008, 00000000001, 00000000000, 00000000000)
001802FAA90  0010057FB56 (000050360EC, 00000010000, 00000000008, 0005BA2E9ED)
001802FAA90  001005E78F1 (0018020FA40, 00000000000, 0018011D81B, 0010067D940)
00000000000  001005F514A (00000000020, 30001010000FF00, 00180049DAA, 00180048DF0)
000FFFFCCD0  00180049E16 (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  00180047973 (00000000000, 00000000000, 00000000000, 00000000000)
End of stack trace (more stack frames may be present)

ConsoleZ aero amd64 1.18.3.18120 beta0
Windows 10 (64 bits) [10.0.15063]
is elevated? no
UAC prefix "Administrator: "
Tab (active): Cygwin
  View (active): 1. WKS75481
  is elevated? no
  input code page 850
  output code page 850
  Windows console font
font index: 0
face name: Lucida Console
font familly: 54 MODERN vector true type
font weight: 400
font size: width=6 height=10
max window size: cols=119 rows=101
  ConsoleZ font
GetFontLanguageInfo returns 262144.
The font contains extra glyphs not normally accessible using the code page.

Monitors 2
+ Flags 1  primary
  DeviceID \\?\DISPLAY#HWP3261#4&1919a1b7&0&UID200195#{e6f07b5f-ee97-4a90-b076-33f57bf4eaa7}
  DeviceKey \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0000
  DeviceName \\.\DISPLAY1\Monitor0
  DeviceString Generic PnP Monitor
  StateFlags 3
  Rect (0,0)x(1920,1080)
  Work (0,0)x(1920,1040)
  DPI (per monitor: yes) X=96 Y=96
+ Flags 0
  DeviceID \\?\DISPLAY#HWP3261#4&1919a1b7&0&UID224795#{e6f07b5f-ee97-4a90-b076-33f57bf4eaa7}
  DeviceKey \Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001
  DeviceName \\.\DISPLAY2\Monitor0
  DeviceString Generic PnP Monitor
  StateFlags 3
  Rect (1920,0)x(3840,1080)
  Work (1920,0)x(3840,1040)
  DPI (per monitor: yes) X=96 Y=96
System dpi 96
System metrics
  SM_CXSMICON        16
  SM_CYSMICON        16
  SM_CXICON          32
  SM_CYICON          32
  SM_CXVIRTUALSCREEN 3840
  SM_CYVIRTUALSCREEN 1080
  SM_CYVIRTUALSCREEN 1080
Settings file C:\Users\HumphrG\AppData\Roaming\Console\console.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<settings lang="auto" icon_size="0">
        <console shell="C:\Cygwin\bin\bash.exe --login -i" init_dir="C:\Cygwin\home\HumphrG" refresh="100" change_refresh="10" rows="73" columns="119" buffer_rows="32766" buffer_columns="0" start_hidden="1" save_size="0">
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[cbucher]

Hi

ConsoleZ aero amd64 1.18.3.18120 beta0
Windows 10 (64 bits) [10.0.15063]

Windows and ConsoleZ versions are old.

Can you provide a crash dump a the child process?

Is vim up to date?

*** fatal error - cmalloc would have returned NULL

This error indicates an error of memory allocation. Perhaps cygwin console layer attempts to allocate a too big memory block.
Verify you have same terminal environment variables with and without ConsoleZ.

[garethhumphriesacc]

Everything was installed within the last few weeks, so if it's not latest it's certainly very recent.
It's not just vim that triggers it, but anything that tries to move the cursor or alter the buffer, so I'm fairly sure version won't make a big difference anyway.

I'm having trouble get a full crash dump, since the exception gets handled by cygwin so it never propagates to the windows handler. I include some gdb info output and backtrace through. Any gdb output that might be of use I can provide easily.

There is no difference in the environments between a consoleZ window and a regular cmd window, other than expected things like ConsoleZBaseDir. Is there anything specific you're interested in?

---

I've experimented more, and found that it's triggered after 26434 lines of scrollback - any less than this and the programs open fine, any more and they error. If I set my scrollback buffer to this size, I can avoid the issue. If I then set it to 26435, I get it again.

This is the case independent of window dimensions - I can open a up a window with narrower/shorter geometry, and still get the issues at the same number of lines. It is also independent of the number of characters in each line.

---

I can't reproduce in a cmd.exe tab running under console, so there is something going on where cygwin expects some memory to be alloc'able which console is preventing from happening. I wish I could tell you more, it's a curly one. :-)

Any more info you want, let me know, happy to help out any way I can.

Backtrace:

#0  0x000000018005ec10 in cygwin_exception::open_stackdumpfile() () from /usr/bin/cygwin1.dll
#1  0x000000018005f2dc in cygwin_exception::dumpstack() () from /usr/bin/cygwin1.dll
#2  0x000000018005f67c in cygwin_stackdump () from /usr/bin/cygwin1.dll
#3  0x0000000180048869 in vapi_fatal () from /usr/bin/cygwin1.dll
#4  0x00000001800488a2 in api_fatal () from /usr/bin/cygwin1.dll
#5  0x00000001800454b3 in cmalloc_abort () from /usr/bin/cygwin1.dll
#6  0x000000018006d2f1 in dev_console::save_restore(void*, char) () from /usr/bin/cygwin1.dll
#7  0x000000018006e17e in fhandler_console::char_command(char) () from /usr/bin/cygwin1.dll
#8  0x0000000180070114 in fhandler_console::write(void const*, unsigned long) () from /usr/bin/cygwin1.dll
#9  0x0000000180136d51 in write () from /usr/bin/cygwin1.dll
#10 0x000000018011d81b in _sigfe () from /usr/bin/cygwin1.dll
#11 0x00000001004fe1b4 in vim!mch_write ()
#12 0x000000010058cd73 in vim!ui_write ()
#13 0x000000010057fb56 in vim!starttermcap ()
#14 0x00000001005e78f1 in vim_main2 ()
#15 0x00000001005f514a in vim!main ()