Re: Regression: Cygwin 3.5.1 freezes when launching several mingw processes in parallel

[jojelino <jojelino@gmail.com>]

$ (echo symbol cygwin1.dll;grep -Po 
'(?<=cygwin1!)[a-z_0-9]*?\+0x[a-f0-9]*'|sed -E 's/^/i line *(/;s/$/)/')|gdb
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Whether backtraces should continue past the entry point of a program is off.
(gdb) Reading symbols from cygwin1.dll...
Reading symbols from /usr/lib/debug/usr/bin/cygwin1.dll.dbg...
(gdb) 00000007`ffffc8c0 00007ffe`7dc57f74     : 00000008`00039b40 
00000008`00039b40 00000000`00010002 0000000a`00000298 : 
cygwin1!dirname+0x198e
00000007`ffffc980 00007ffe`7dc56a78     : 00000000`00f2f2f2 
00000000`00000000 00000007`ffffcd30 00007ffe`e44773ae : 
cygwin1!cuserid+0x16e16
00000007`ffffc9c0 00007ffe`7dc581d3     : 00ff783b`00767676 
00000000`005b0720 00000000`00000002 00000008`00004870 : 
cygwin1!cuserid+0x1591a
00000007`ffffca40 00007ffe`7dbb954d     : 00020000`00000050 
00000000`000a3dd0 00000000`000ab7b0 00000000`00000000 : 
cygwin1!cuserid+0x17075
00000007`ffffca70 00007ffe`7dbb99c2     : 00000007`ffffcc8a 
00007ffe`7dba7d37 00000007`ffffcd30 00000007`00000c90 : 
cygwin1!dlfork+0x2695
00000007`ffffcb70 00007ffe`7dba7187     : 315c615c`305c625c 
2f00735c`2e5c625c 5f5c6c5c`665c615c 745c735c`6e5c695c : 
cygwin1!dlfork+0x2b0a
00000007`ffffcbf0 00007ffe`7dba5e08     : 00000000`00000000 
00000000`00000000 00000000`00000000 00000000`00000000 : 
cygwin1!cygwin_dll_init+0x381
00000007`ffffcd80 00007ffe`7dba5e86     : 00000000`00000000 
00000000`00000000 00000000`00000000 00000000`00000000 : 
cygwin1!_assert+0x23f0
00000007`ffffcdd0 00000000`00000000     : 00007ffe`7dd0604f 
00000008`0003a210 00000000`00000000 00000008`00039400 : 
cygwin1!_assert+0x246e
Line 74 of 
"/usr/src/debug/cygwin-3.5.1-1/winsup/cygwin/local_includes/tty.h"
    starts at address 0x1800995ad <_pinfo::set_ctty(fhandler_termios*, 
int)+1275> and ends at 0x1800995bb <_pinfo::set_ctty(fhandler_termios*, 
int)+1289>.
(gdb) Line 1853 of 
"/usr/src/debug/cygwin-3.5.1-1/winsup/cygwin/fhandler/console.cc"
    starts at address 0x1800f7f74 <fhandler_console::open_setup(int)+52>
    and ends at 0x1800f7f78 <fhandler_console::open_setup(int)+56>.
(gdb) Line 474 of 
"/usr/src/debug/cygwin-3.5.1-1/winsup/cygwin/fhandler/base.cc"
    starts at address 0x1800f6a78 <fhandler_base::open_with_arch(int, 
unsigned int)+312>
    and ends at 0x1800f6a7c <fhandler_base::open_with_arch(int, unsigned 
int)+316>.
(gdb) Line 4132 of 
"/usr/src/debug/cygwin-3.5.1-1/winsup/cygwin/fhandler/console.cc"
    starts at address 0x1800f81d3 <fhandler_console::init(void*, 
unsigned int, unsigned int)+73>
    and ends at 0x1800f81de <fhandler_console::init(void*, unsigned int, 
unsigned int)+84>.
(gdb) Line 407 of "/usr/src/debug/cygwin-3.5.1-1/winsup/cygwin/dtable.cc"
    starts at address 0x18005954d 
<dtable::init_std_file_from_handle(int, void*)+1011>
    and ends at 0x180059555 <dtable::init_std_file_from_handle(int, 
void*)+1019>.
(gdb) Line 186 of "/usr/src/debug/cygwin-3.5.1-1/winsup/cygwin/dtable.cc"
    starts at address 0x1800599b0 <dtable::stdio_init()+148>
    and ends at 0x1800599c3 <dtable::stdio_init()+167>.
(gdb) Line 928 of "/usr/src/debug/cygwin-3.5.1-1/winsup/cygwin/dcrt0.cc"
    starts at address 0x180047187 <dll_crt0_1(void*)+463>
    and ends at 0x180047191 <dll_crt0_1(void*)+473>.
(gdb) No symbol "_assert" in current context.
(gdb) No symbol "_assert" in current context.
(gdb)
quit


On 3/1/2024 6:34 AM, Kevin Schnitzius via Cygwin wrote:
> On Thursday, February 29, 2024 at 01:21:01 PM EST, Kate Deplaix via Cygwin <cygwin@cygwin.com> wrote:
>> At some point of the make process, one job will infinit loop (taking 100% of one core), while the rest of the mingw jobs will idle and never finish. After some time Cygwin Terminal isn't
>> responsive anymore, and I'm not able to open another one or to spawn any other processes that are relying on the cygwin dll. I was able to observe this behaviour every time i tried
>> consistently.
> 
> I have repro'd this problem with the exception that there was no 100% cpu usage.  Looks like an exception handling loop:
> 
> (2c20.4df8): Access violation - code c0000005 (first chance)
> First chance exceptions are reported before any exception handling.
> This exception may be expected and handled.
> cygwin1!dirname+0x198e:
> 00007ffe`7dbf95ad 458b5c2408      mov     r11d,dword ptr [r12+8] ds:00000001`a0030008=????????
> 0:000> g
> (2c20.4df8): Access violation - code c0000005 (first chance)
> First chance exceptions are reported before any exception handling.
> This exception may be expected and handled.
> cygwin1!dirname+0x198e:
> 00007ffe`7dbf95ad 458b5c2408      mov     r11d,dword ptr [r12+8] ds:00000001`a0030008=????????
> 0:000> g
> (2c20.4df8): Access violation - code c0000005 (first chance)
> First chance exceptions are reported before any exception handling.
> This exception may be expected and handled.
> cygwin1!dirname+0x198e:
> 00007ffe`7dbf95ad 458b5c2408      mov     r11d,dword ptr [r12+8] ds:00000001`a0030008=????????
> 0:000> g
> (2c20.4df8): Access violation - code c0000005 (first chance)
> First chance exceptions are reported before any exception handling.
> This exception may be expected and handled.
> cygwin1!dirname+0x198e:
> 00007ffe`7dbf95ad 458b5c2408      mov     r11d,dword ptr [r12+8] ds:00000001`a0030008=????????
> 
> 
> STACK_TEXT:
> 00000007`ffffc8c0 00007ffe`7dc57f74     : 00000008`00039b40 00000008`00039b40 00000000`00010002 0000000a`00000298 : cygwin1!dirname+0x198e
> 00000007`ffffc980 00007ffe`7dc56a78     : 00000000`00f2f2f2 00000000`00000000 00000007`ffffcd30 00007ffe`e44773ae : cygwin1!cuserid+0x16e16
> 00000007`ffffc9c0 00007ffe`7dc581d3     : 00ff783b`00767676 00000000`005b0720 00000000`00000002 00000008`00004870 : cygwin1!cuserid+0x1591a
> 00000007`ffffca40 00007ffe`7dbb954d     : 00020000`00000050 00000000`000a3dd0 00000000`000ab7b0 00000000`00000000 : cygwin1!cuserid+0x17075
> 00000007`ffffca70 00007ffe`7dbb99c2     : 00000007`ffffcc8a 00007ffe`7dba7d37 00000007`ffffcd30 00000007`00000c90 : cygwin1!dlfork+0x2695
> 00000007`ffffcb70 00007ffe`7dba7187     : 315c615c`305c625c 2f00735c`2e5c625c 5f5c6c5c`665c615c 745c735c`6e5c695c : cygwin1!dlfork+0x2b0a
> 00000007`ffffcbf0 00007ffe`7dba5e08     : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : cygwin1!cygwin_dll_init+0x381
> 00000007`ffffcd80 00007ffe`7dba5e86     : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : cygwin1!_assert+0x23f0
> 00000007`ffffcdd0 00000000`00000000     : 00007ffe`7dd0604f 00000008`0003a210 00000000`00000000 00000008`00039400 : cygwin1!_assert+0x246e
> 
> 
> gdb does not connect...
> 
> Other interesting thing, the "bad" gcc has cons0 tty attached:
> 
> 18907       1   18907      11296  cons0   1610619958 16:19:23 /usr/bin/x86_64-w64-mingw32-gcc
> 
> Kevin
> 
> 
>