http://bugs.winehq.org/show_bug.cgi?id=59472 Bug ID: 59472 Summary: FreeArc hangs on startup in new wow64 mode Product: Wine Version: 11.3 Hardware: x86-64 URL: https://archive.org/details/FreeArc-0.666-win32bin-Sou rces OS: Linux Status: NEW Keywords: download, testcase, wow64 Severity: normal Priority: P2 Component: -unknown Assignee: wine-bugs@list.winehq.org Reporter: arethusa26@gmail.com Distribution: --- Created attachment 80459 --> http://bugs.winehq.org/attachment.cgi?id=80459 Largest memory block loop test case executable When running the FreeArc archiver tool on the command line to add a file to an archive with a new wow64 build of Wine, the tool hangs indefinitely with only a banner output string: $ wine freearc/bin/Arc.exe a test.arc empty_file 0124:fixme:ntdll:NtQuerySystemInformation info_class SYSTEM_PERFORMANCE_INFORMATION FreeArc 0.666 With a old wow64 build of Wine, the tool runs and completes successfully: $ wine freearc/bin/Arc.exe a test.arc empty_file 0024:fixme:ntdll:NtQuerySystemInformation info_class SYSTEM_PERFORMANCE_INFORMATION FreeArc 0.666 0024:err:virtual:map_view anon mmap error Cannot allocate memory, size 0x80010000, unix_prot 0 0024:err:virtual:allocate_virtual_memory out of memory for allocation, base (nil) size 80000000 0024:err:virtual:map_view anon mmap error Cannot allocate memory, size 0x78010000, unix_prot 0 0024:err:virtual:allocate_virtual_memory out of memory for allocation, base (nil) size 78000000 ... creating archive: test.arc Compressing 1 file, 1,024 bytes. Processed 0% 0024:err:virtual:map_view anon mmap error Cannot allocate memory, size 0x80010000, unix_prot 0 0024:err:virtual:allocate_virtual_memory out of memory for allocation, base (nil) size 80000000 0024:err:virtual:map_view anon mmap error Cannot allocate memory, size 0x78010000, unix_prot 0 0024:err:virtual:allocate_virtual_memory out of memory for allocation, base (nil) size 78000000 ... Compressed 1 file, 1,024 => 44 bytes. Ratio 4.2% Compression time: cpu 0.62 secs, real 0.31 secs. Speed 3 kB/s All OK To reproduce the issue with FreeArc, download "FreeArc-portable-0.666-win32.zip" from the URL link and extract the contents of the ZIP file to a directory named "freearc". The Arc.exe binary can be run with the provided command line. When FreeArc is run with new wow64 Wine, there appears to be a thread that is stuck repeatedly calling VirtualAlloc with 0 size: 0124:trace:virtual:NtAllocateVirtualMemory 0xffffffffffffffff (nil) 00000000 2000 00000004 0124:trace:virtual:NtFreeVirtualMemory 0xffffffffffffffff (nil) 00000000 8000 0124:trace:virtual:NtAllocateVirtualMemory 0xffffffffffffffff (nil) 00000000 2000 00000004 0124:trace:virtual:NtFreeVirtualMemory 0xffffffffffffffff (nil) 00000000 8000 The code involved in the hang appears to be the LargestMemoryBlock::LargestMemoryBlock() constructor in Environment.cpp from the FreeArc sources. It's a (buggy) loop that attempts a binary search for the largest size it can successfully pass to VirtualAlloc. I have extracted the logic to create a standalone test case, which is built with: i686-w64-mingw32-gcc -O2 -Wall -Wl,--large-address-aware -o largest_memory_block.exe largest_memory_block.c On Windows 10, the largest_memory_block.exe test case shows the following output: a = 0 b = ffffffff Freeing pointer 00000000 with VirtualFree Allocating 7fffffff bytes with VirtualAlloc VirtualAlloc returned 00000000 VirtualAlloc failed, updating b to 7fffffff a = 0 b = 7fffffff Freeing pointer 00000000 with VirtualFree Allocating 3fffffff bytes with VirtualAlloc VirtualAlloc returned 01970000 VirtualAlloc succeeded, updating a to 3fffffff ... a = 7f98ffff b = 7f990001 Freeing pointer 00000000 with VirtualFree Allocating 7f990000 bytes with VirtualAlloc VirtualAlloc returned 7fff0000 VirtualAlloc succeeded, updating a to 7f990000 On new wow64 Wine, the test case shows the following output: a = 0 b = ffffffff Freeing pointer 00000000 with VirtualFree Allocating 7fffffff bytes with VirtualAlloc VirtualAlloc returned 7fff0000 VirtualAlloc succeeded, updating a to 7fffffff a = 7fffffff b = ffffffff Freeing pointer 7fff0000 with VirtualFree Allocating 3fffffff bytes with VirtualAlloc VirtualAlloc returned 00900000 VirtualAlloc succeeded, updating a to 3fffffff ... a = 1 b = ffffffff Freeing pointer 003f0000 with VirtualFree Allocating 0 bytes with VirtualAlloc VirtualAlloc returned 00000000 VirtualAlloc failed, updating b to 0 a = 1 b = 0 Freeing pointer 00000000 with VirtualFree Allocating 0 bytes with VirtualAlloc VirtualAlloc returned 00000000 VirtualAlloc failed, updating b to 0 ... The midpoint computation "c = (a + b) / 2" in the loop overflows when the initial allocation succeeds on Wine and leads to incorrect execution, whereas the initial allocation doesn't appear to succeed on Windows. -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.