second call to mmap() results in error

[Marco Atzeri]

On 29/01/2014 19:12, Corinna Vinschen wrote:
> On Jan 29 09:00, Steven Bardwell wrote:
>> My application needs several areas of shared memory, and I am getting an
>> error ("No such device") on the second call to mmap(). The first call works
>> fine.
>>

>>
>> The problem does not seem to depend on the size of the requested memory. The
>> program
>> always returns with "Couldn't map memory for /block2 (No such device)"
>
> Try stracing it.  I tried it on the latest Cygwin from CVS as well
> as on Cygwin 1.7.27 (32 bit versions) and it works fine for me.

just as info also on my
Windows 7 Professional Ver 6.1 Build 7601 Service Pack 1

CYGWIN_NT-6.1-WOW64  1.7.28s(0.271/5/3) 20140128 10:55:59 i686 Cygwin
the program fails (No such device)

and it segfaults on 64 bit
CYGWIN_NT-6.1 1.7.28s(0.271/5/3) 20140128 10:55:59 x86_64 Cygwin
attached the stackdump

>
> Your testcase is missing an ftruncate or two., btw.  I guess you're
> aware of that and just dropped them to get a the simple testcase.
>
>
> Corinna


Marco
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Exception: STATUS_ACCESS_VIOLATION at rip=00180043471
rax=000000097FE5A410 rbx=00000001802A60C0 rcx=00000001801CD300
rdx=00000000FFF70000 rsi=000006FFFFF70000 rdi=0000000000000001
r8 =000000000022A8A8 r9 =0000000000000000 r10=0000000000000000
r11=0000000000000206 r12=0000000000090000 r13=FFFFFFFFFFF70000
r14=00000001802A60E0 r15=000006FFFFF70000
rbp=0000000000000000 rsp=000000000022A880
program=E:\cygwin64\tmp\mmaptest64.exe, pid 1124, thread main
cs=0033 ds=002B es=002B fs=0053 gs=002B ss=002B
Stack trace:
Frame        Function    Args
00000000000  00180043471 (00000040202, 0000022AA20, 00000000030, 00000004022)
00000000000  001800C6338 (00180161BCA, 00000000000, 0018006A22E, 000FFFFFFFF)
0000022AAF0  001801114BB (00000000000, 0018006A22E, 000FFFFFFFF, 00000000000)
0000022AAF0  04949435341 (0018006A22E, 000FFFFFFFF, 00000000000, 001802E19D8)
0000022AAF0  00180161BCA (001800473E0, 00000000000, 00000000000, 001802E10C8)
0000022AB80  001800481FA (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  0018004611B (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  0018004627E (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  001004012B1 (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  00100401010 (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  00076B2652D (00000000000, 00000000000, 00000000000, 00076BA9300)
00000000000  00076EAC541 (00000000000, 00000000000, 00000000000, 00076BA9300)
End of stack trace
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