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<20180212164945 DOT GA2361 AT jbsupah> From: Bryan Zimmer Date: Tue, 13 Feb 2018 19:41:43 -0600 Message-ID: Subject: Re: cygwin stopped working To: cygwin AT cygwin DOT com Content-Type: text/plain; charset="UTF-8" X-IsSubscribed: yes I have been following this thread closely as I have a similar problem. It only differs in that mintty, which I use to start bash, fails completely. It tells me that it cannot fork, that the problem could be that I have more than 1 cygwin1.dll, that I should run rebaseall or rebase --help. Unfortunately all cygwin processes have the same problem. Even a fresh, clean re-installation of all of cygwin left me with the same problem. On Mon, Feb 12, 2018 at 10:58 PM, Andreas Schiffler wrote: > Found the workaround (read: not really a solution as it leaves the system > vulnerable, but it unblocks cygwin) > - Go to Windows Defender Security Center - Exploit protection settings > - Disable System Settings - Force randomization for images (Mandatory > ASLR) and Randomize memory allocations (Bottom-up ASLR) from "On by > default" to "Off by default" > > Now setup.exe works and can rebase everything; after that Cygwin Terminal > starts as a working shell without problems. > > @cygwin dev's - It seems one of the windows updates (system is on 1709 > build 16299.214) might have changed my ASLR settings to "system wide > mandatory" (i.e. see https://blogs.technet.microsof > t.com/srd/2017/11/21/clarifying-the-behavior-of-mandatory-aslr/ for info) > so that the cygwin DLLs don't work correctly anymore (i.e. see old thread > about this topic here https://www.cygwin.com/ml/cygw > in/2013-06/msg00092.html). This change might have made it into the system > as part of the security update for Meltdown+Spectre (I am speculating), but > that could explain why my cygwin installation that worked fine before (i.e. > mid-2017) stopped working suddenly (beginning 2018). It would be good to > device a test for the setup.exe that checks the registry (likely > [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session > Manager\kernel]) for this state and alerts the user. > @jostein - rebase as part of setup.exe had failed as well (see above). > @Achim - that didn't work or do anything (see above). > > > On 2/12/2018 8:49 AM, Jostein Berntsen wrote: > >> On 11.02.18,17:16, Andreas Schiffler wrote: >> >>> Thanks for the tip, but that didn't seem to have helped. >>> >>> The registry setting CYGWIN_NOWINPATH=1 did not seem to affect the >>> environment as seen in bash. >>> >>> The variable seems to be set: >>> >>> bash-4.4$ set >>> ...snip... >>> COMSPEC='C:\WINDOWS\system32\cmd.exe' >>> CYGWIN_NOWINPATH=1 >>> ...snip >>> >>> but the path variable contains still all the common system locations: >>> >>> bash-4.4$ echo $PATH >>> /cygdrive/c/ProgramData/Oracle/Java/javapath:/cygdrive/c/Program Files >>> (x86)/iis express/PHP/v5.3:/cygdrive/c/Program Files/Common Files/Mic >>> rosoft Shared/Windows Live:/cygdrive/c/Program Files (x86)/Common >>> Files/Microsoft Shared/Windows Live:/cygdrive/c/Program Files >>> (x86)/Intel/ >>> iCLS Client:/cygdrive/c/Program Files/Intel/iCLS >>> Client:/cygdrive/c/Windows/system32:/cygdrive/c/Windows:...snip... >>> >>> Manually overriding the PATH variable in bash did not help (presumably >>> because the offending DLL is already loaded): >>> >>> bash-4.4$ export PATH=/usr/local/bin:/usr/bin:/bin >>> bash-4.4$ echo $PATH >>> /usr/local/bin:/usr/bin:/bin >>> bash-4.4$ >>> bash-4.4$ >>> bash-4.4$ ls >>> 0 [main] bash (11276) C:\Cygwin\bin\bash.exe: *** fatal error - >>> cygheap base mismatch detected - 0x3C52410/0x36F2410. >>> This problem is probably due to using incompatible versions of the cygwin >>> DLL. >>> Search for cygwin1.dll using the Windows Start->Find/Search facility >>> and delete all but the most recent version. The most recent version >>> *should* >>> reside in x:\cygwin\bin, where 'x' is the drive on which you have >>> installed the cygwin distribution. Rebooting is also suggested if you >>> are unable to find another cygwin DLL. >>> >>> >>> On 2/11/2018 2:42 AM, Doug Henderson wrote: >>> >>>> On 11 February 2018 at 01:18, Andreas Schiffler wrote: >>>> >>>>> Terminal (bash) fails with: >>>>> >>>>> Error: Could not fork child process: Resource temporarily unavailable >>>>> (-1). >>>>> DLL rebasing may be required; see 'rebaseall / rebase --help'. >>>>> >>>>> {snip} >>>> >>>>> bash-4.4$ ls >>>>> 1 [main] bash (6316) C:\Cygwin\bin\bash.exe: *** fatal error - >>>>> cygheap >>>>> base mismatch detected - 0x3922410/0x3962410. >>>>> This problem is probably due to using incompatible versions of the >>>>> cygwin >>>>> DLL. >>>>> >>>> {snip} >>>> >>>>> I do have another version of the cygwin dll file on the system (Plex >>>>> installation) but that never caused any issues in the past. >>>>> >>>> {snip} >>>> >>>> Run setup.exe for Cugwin once again and let it rebase. Then reboot and >> see if that works. >> >> Jostein >> >> >> >> -- >> Problem reports: http://cygwin.com/problems.html >> FAQ: http://cygwin.com/faq/ >> Documentation: http://cygwin.com/docs.html >> Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple >> >> >> > > -- > Problem reports: http://cygwin.com/problems.html > FAQ: http://cygwin.com/faq/ > Documentation: http://cygwin.com/docs.html > Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple > > -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple