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Hi, I have some quite large and long build scripts running on cygwin, on some occasions (really rare), the build script just stops progressing. Looking at the processes with "process explorer", I always notice that one sh.exe is stuck, taking 100% of a core. The stack for that hang process is: cygwin1.dll!setprogname+0x10b3 cygwin1.dll!__rcmd_errstr+0x788c0 cygwin1.dll!setprogname+0x10b3 cygwin1.dll!__main+0x141a cygwin1.dll!dll_entry@12+0x2d9 ntdll.dll!RtlDestroyQueryDebugBuffer+0xff ntdll.dll!LdrFindResourceDirectory_U+0x9cc ntdll.dll!RtlGetNtVersionNumbers+0x103 ntdll.dll!LdrInitShimEngineDynamic+0x13f ntdll.dll!LdrInitializeThunk+0x10 (I can't attach gdb to it so this is the stack provided by process explorer). If I attach the windbg debugger, I can get the assembly portion the loop that executes forever: 61002900 8b03 mov eax,dword ptr [ebx] ds:002b:6127b1ec=00000000 61002902 85c0 test eax,eax 61002904 741a je cygwin1!setprogname+0x10b0 (61002920) 61002906 833b1f cmp dword ptr [ebx],1Fh 61002909 7715 ja cygwin1!setprogname+0x10b0 (61002920) 6100290b 8b4308 mov eax,dword ptr [ebx+8] 6100290e 8d5308 lea edx,[ebx+8] 61002911 83f809 cmp eax,9 61002914 7e0a jle cygwin1!setprogname+0x10b0 (61002920) 61002916 83f863 cmp eax,63h 61002919 7f15 jg cygwin1!setprogname+0x10c0 (61002930) 6100291b 83c064 add eax,64h 6100291e 8902 mov dword ptr [edx],eax 61002920 8b5b04 mov ebx,dword ptr [ebx+4] 61002923 85db test ebx,ebx 61002925 75d9 jne cygwin1!setprogname+0x1090 (61002900) 61002927 83c418 add esp,18h 6100292a 5b pop ebx 6100292b c20400 ret 4 -- Julien
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