Mail Archives: cygwin/2017/12/09/13:30:02
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| Reply-To: | Brian DOT Inglis AT SystematicSw DOT ab DOT ca
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| Subject: | Re: fork fails after nmap with hint address in an unmapped memory region
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| To: | cygwin AT cygwin DOT com
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| References: | <b431898c-30f5-2847-c922-0f25a525ef76 AT yahoo DOT fr> <15510444518 DOT 20171209184819 AT yandex DOT ru> <42c71a45-e61b-6917-b634-e912fb51d2d5 AT yahoo DOT fr>
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| From: | Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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| Message-ID: | <56047a39-4e1e-fa50-0e8b-c123c5b5ed3c@SystematicSw.ab.ca>
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| Date: | Sat, 9 Dec 2017 11:29:45 -0700
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On 2017-12-09 08:53, Stéphane Mbape via cygwin wrote:
> Le 09/12/2017 à 16:48, Andrey Repin a écrit :
>>> While embeding luajit in a c program, I found myself unable to fork
>>> processes.
>>> Investigations prove that it was related to nmap.
>>> To be accurate, calling nmap with hint address in a unmapped memory
>>> region will cause all forks to fail with
>>> "fixup_mmaps_after_fork: ReadProcessMemory failed for MAP_PRIVATE
>>> address 0x6FFFFFE0000, Win32 error 299"
>>> There is a sample code below.
>> You forgot to mention Cygwin version you're using, and please provide the
>> sample as an attach to save people the copy-pasting issues.
> Cygwin version: 2.9.0
> OS: Windows 10
> Arch: 64bit
> The sample was also attached.
Confirmed reproducible; addr2line does not give anything useful from the
stackdump, but included raw stackdump below, in case it gives hints.
Complete output after renaming doscript.c to mmap_fork_stc.c, also with addr +
4096 as well as addr + 1:
$ gcc -g -O0 -o mmap_fork_stc{,.c}
$ ./mmap_fork_stc
I am master 5464
nmap() = 0x6fffffe0000, hint_addr = 0x0
nmap() = 0x6fffffe0000, hint_addr = 0x6fffffe1000
1 [main] mmap_fork_stc 11408 fixup_mmaps_after_fork: ReadProcessMemory
failed for MAP_PRIVATE address 0x6FFFFFE0000, Win32 error 299
286 [main] mmap_fork_stc 11408 ...\mmap_fork_stc.exe: *** fatal error in
forked process - recreate_mmaps_after_fork_failed
1298 [main] mmap_fork_stc 11408 cygwin_exception::open_stackdumpfile: Dumping
stack trace to mmap_fork_stc.exe.stackdump
0 [main] mmap_fork_stc 5464 fork: child -1 - forked process 11408 died
unexpectedly, retry 0, exit code 0x100, errno 11
fork failed: Resource temporarily unavailable
master exiting
$ more mmap_fork_stc.exe.stackdump
Stack trace:
Frame Function Args
000005FF3A0 0018005CD8E (0018021AE80, 0018021AC46, 00000008000, 000005FB010)
000005FF3A0 001800465F9 (000005FDDE0, 000005FF3A0, 001800B2D10, 00000000000)
000005FF3A0 00180046632 (00000000000, 000005FBE28, 00000008000, 00100402068)
000005FF3A0 00180046B84 (0007FFE0385, 000005FDDE0, 001800B2D10, 00000000000)
000005FF3A0 00180048040 (00000000000, 00000000000, 00000000000, 00000000000)
000005FF3A0 001800B2EDB (00000000000, 00000000000, 00000000000, 00000000000)
000005FF620 7FFF7777485F (00180040000, 00000000001, 00000240022, 000006D20C8)
000005FF620 7FFF7779D762 (7FFF77797900, 000006D2701, 7FFF774A27BA, 000006D2F10)
000005FF620 7FFF7779D5AB (000006D2720, 000005FF5D0, 00000000003, 0000032E000)
000005FF620 7FFF7779D5D1 (00000000003, 000005FF629, 00000000003, 00000000000)
00000000000 7FFF777E1D31 (00000000000, 00000000000, 00000000001, 00000000000)
00000000000 7FFF7781A1FC (00000000000, 00000000000, 0000032E000, 00000000000)
00000000000 7FFF777C9B1B (00000000000, 00000000000, 00000000000, 00000000000)
00000000000 7FFF777C9ACE (00000000000, 00000000000, 00000000000, 00000000000)
End of stack trace
$ cygcheck ./mmap_fork_stc
C:\Users\bwi\src\cygwin\mmap_fork_stc.exe
C:\usr\local\cygwin64\bin\cygwin1.dll
C:\WINDOWS\system32\KERNEL32.dll
C:\WINDOWS\system32\ntdll.dll
C:\WINDOWS\system32\KERNELBASE.dll
C:\Program Files\TortoiseGit\bin\api-ms-win-core-handle-l1-1-0.dll
C:\WINDOWS\system32\api-ms-win-core-synch-l1-2-0.dll
C:\WINDOWS\system32\api-ms-win-core-timezone-l1-1-0.dll
C:\Program Files\TortoiseGit\bin\api-ms-win-core-string-l1-1-0.dll
C:\Program Files\TortoiseGit\bin\api-ms-win-core-util-l1-1-0.dll
C:\Program Files\TortoiseGit\bin\api-ms-win-core-profile-l1-1-0.dll
C:\WINDOWS\system32\api-ms-win-core-xstate-l2-1-0.dll
C:\Program Files\TortoiseGit\bin\api-ms-win-core-console-l1-1-0.dll
$ cmd /c ver
Microsoft Windows [Version 10.0.15063]
$ uname -srvmo
CYGWIN_NT-10.0 2.9.0(0.318/5/3) 2017-09-12 10:18 x86_64 Cygwin
--
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
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