The macOS V2 Sandbox allows access to the com.apple.logd mach service because CFPreferences tries to open a handle to it in its static initializer. Similar to  crbug.com/792217 , this can be resolved only if CFPreferences is stubbed away.

SandboxViolation: Chromium Helper(23193) deny mach-lookup com.apple.logd
Violation:       deny mach-lookup com.apple.logd 
Process:         Chromium Helper [23193]
Path:            /Users/kerrnel/chromium/src/out/Chromium/Chromium.app/Contents/Versions/65.0.3285.0/Chromium Helper.app/Contents/MacOS/Chromium Helper
Load Address:    0x108c22000
Identifier:      org.chromium.Chromium.helper
Version:         3285.0 (65.0.3285.0)
Code Type:       x86_64 (Native)
Parent Process:  Chromium [23185]
Responsible:     /Applications/Utilities/Terminal.app/Contents/MacOS/Terminal [82914]
User ID:         317580

Date/Time:       2017-12-05 14:31:58.324 PST
OS Version:      Mac OS X 10.12.6 (16G1036)
Report Version:  8

Thread 0 (id: 8232257):
0   libsystem_kernel.dylib        	0x00007fffdeaee34a mach_msg_trap + 10
1   libxpc.dylib                  	0x00007fffdec154cf xpc_pipe_routine + 232
2   libxpc.dylib                  	0x00007fffdec15359 _xpc_interface_routine + 164
3   libxpc.dylib                  	0x00007fffdec14f0c bootstrap_look_up3 + 193
4   libxpc.dylib                  	0x00007fffdec14e39 bootstrap_look_up2 + 45
5   libsystem_trace.dylib         	0x00007fffdebfa26e _os_trace_get_logd_port + 70
6   libdispatch.dylib             	0x00007fffde9b80f5 _firehose_task_buffer_init + 135
7   libdispatch.dylib             	0x00007fffde9918fc _dispatch_client_callout + 8
8   libdispatch.dylib             	0x00007fffde9918b9 dispatch_once_f + 38
9   libdispatch.dylib             	0x00007fffde9922f7 voucher_activity_get_metadata_buffer + 100
10  libsystem_trace.dylib         	0x00007fffdebf9ae0 _os_trace_init_slow + 92
11  libdispatch.dylib             	0x00007fffde9918fc _dispatch_client_callout + 8
12  libdispatch.dylib             	0x00007fffde9918b9 dispatch_once_f + 38
13  libsystem_trace.dylib         	0x00007fffdebf88b7 _os_activity_create_addr + 422
14  CoreFoundation                	0x00007fffc8f2c624 __80-[CFPrefsSearchListSource alreadylocked_generationCountFromListOfSources:count:]_block_invoke + 84
15  CoreFoundation                	0x00007fffc8f2c4e2 -[CFPrefsSearchListSource alreadylocked_generationCountFromListOfSources:count:] + 226
16  CoreFoundation                	0x00007fffc8db45c0 -[CFPrefsSearchListSource alreadylocked_copyDictionary] + 336
17  CoreFoundation                	0x00007fffc8db429c -[CFPrefsSearchListSource alreadylocked_copyValueForKey:] + 60
18  CoreFoundation                	0x00007fffc8edf055 -[CFPrefsSource copyValueForKey:] + 53
19  CoreFoundation                	0x00007fffc8f5a2e0 __76-[_CFXPreferences copyAppValueForKey:identifier:container:configurationURL:]_block_invoke + 32
20  CoreFoundation                	0x00007fffc8f2d892 __108-[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:]_block_invoke + 290
21  CoreFoundation                	0x00007fffc8f2d709 -[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:] + 345
22  CoreFoundation                	0x00007fffc8f5a246 -[_CFXPreferences copyAppValueForKey:identifier:container:configurationURL:] + 310
23  CoreFoundation                	0x00007fffc8dad634 _CFPreferencesGetAppBooleanValueWithContainer + 68
24  QuickLook                     	0x00007fffceee02ca _QLAppPreferencesBooleanValueForKey + 50
25  QuickLookUI                   	0x00007fffcec37af9 _GLOBAL__sub_I_InterpolationUtils.mm + 18
26  dyld                          	0x0000000112014a1b ImageLoaderMachO::doModInitFunctions(ImageLoader::LinkContext const&) + 385
27  dyld                          	0x0000000112014c1e ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) + 40
28  dyld                          	0x00000001120104aa ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, char const*, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 338
29  dyld                          	0x0000000112010441 ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, char const*, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 233
30  dyld                          	0x0000000112010441 ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, char const*, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 233
31  dyld                          	0x0000000112010441 ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, char const*, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 233
32  dyld                          	0x0000000112010441 ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, char const*, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 233
33  dyld                          	0x000000011200f524 ImageLoader::processInitializers(ImageLoader::LinkContext const&, unsigned int, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 138
34  dyld                          	0x000000011200f5b9 ImageLoader::runInitializers(ImageLoader::LinkContext const&, ImageLoader::InitializerTimingList&) + 75
35  dyld                          	0x00000001120047cd dyld::runInitializers(ImageLoader*) + 87
36  dyld                          	0x000000011200c3ec dlopen + 556
37  libdyld.dylib                 	0x00007fffde9c4832 dlopen + 59
38  Chromium Helper               	0x0000000108c233f9 main + 1609 (chrome_exe_main_mac.cc:152)
39  libdyld.dylib                 	0x00007fffde9c7235 start + 1
40  Chromium Helper               	0x000000000000000a