I also can't repro this locally

Is there someone who can help sort out how to locally repro the environment these tests are run in? Or even if I could manually kick off a job on the FYI bot that would be a good start.

base::debug::`anonymous namespace'::InitializeSymbols is failing from within the sandbox on the win10 bot

ModLoad: 00007ffc`f39f0000 00007ffc`f3a22000   C:\WINDOWS\SYSTEM32\fwbase.dll
(12fc.1300): Unknown exception - code c06d007e (first chance)
(12fc.1300): Unknown exception - code c06d007e (!!! second chance !!!)
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for C:\WINDOWS\system32\KERNELBASE.dll - 
KERNELBASE!RaiseException+0x68:
00007ffc`f4f61f08 488b8c24c0000000 mov     rcx,qword ptr [rsp+0C0h] ss:000000cd`c25bf3b0=0000a8f9ec683574
3:015> k
*** WARNING: Unable to verify checksum for content_browsertests.exe
Child-SP          RetAddr           Call Site
000000cd`c25bf2f0 00007ff6`33124c31 KERNELBASE!RaiseException+0x68
000000cd`c25bf3d0 00007ff6`330e7aff content_browsertests!__delayLoadHelper2+0x189 [f:\dd\vctools\delayimp\delayhlp.cpp @ 315]
000000cd`c25bf490 00007ff6`3105a8ee content_browsertests!_tailMerge_dbghelp_dll+0x3f
000000cd`c25bf500 00007ff6`3316f30f content_browsertests!base::debug::`anonymous namespace'::InitializeSymbols+0x4e
000000cd`c25bf5e0 00007ff6`3316d44b content_browsertests!base::TestSuite::Initialize+0xff
000000cd`c25bf790 00007ff6`3316f682 content_browsertests!content::ContentTestSuiteBase::Initialize+0xb
000000cd`c25bf7c0 00007ff6`3314ba19 content_browsertests!base::TestSuite::Run+0x22
000000cd`c25bf840 00007ff6`30e03d2b content_browsertests!content::ContentTestLauncherDelegate::RunTestSuite+0x39
000000cd`c25bf8c0 00007ff6`3314baa9 content_browsertests!content::LaunchTests+0x25b
000000cd`c25bfd60 00007ff6`330eae6c content_browsertests!main+0x59
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for C:\WINDOWS\system32\KERNEL32.DLL - 
000000cd`c25bfda0 00007ffc`f7e28102 content_browsertests!__tmainCRTStartup+0x144 [f:\dd\vctools\crt\crtw32\startup\crt0.c @ 255]
000000cd`c25bfde0 00007ffc`f86ac574 KERNEL32!BaseThreadInitThunk+0x22
000000cd`c25bfe10 00000000`00000000 ntdll!RtlUserThreadStart+0x34

Other tests that run sandboxed childs (e.g. sbox_integration_tests) have a very early if() statement to avoid instantiating the entire test suite e.g.

https://code.google.com/p/chromium/codesearch#chromium/src/sandbox/win/tests/integration_tests/integration_tests.cc&sq=package:chromium&type=cs&l=13

I don't think it's possible to launch an entire test based on base::TestSuite in the sandbox successfully. I'm surprised this works on other OS, perhaps there is something different happening with delay load on this particular win10 bot.

it doesn't make any sense that these tests are failing on the vm17-m1 bot but passing on all other win10 boxes I have.

I have tried the following:
 * Disabling UAC on my test vm to match vm17-m1 - still passes on my vm and fails on vm17-m1.
 * isolating the tests, running from a new dir. still fails on vm17-m1.
 * Setting path on vm17-m1 to same as my test VM, still fails on vm17-m1.
 * copying the tests off vm17-m1 and running on another VM - passes on another VM but still not on vm17-m1.
 * running depends on both the vm and my test machine and they look the same, both loading dbghelp.dll via imagehlp.dll

I don't understand this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b7e5cabccbc6297a67af7960ac4b0d5afe36089d

commit b7e5cabccbc6297a67af7960ac4b0d5afe36089d
Author: rockot <rockot@chromium.org>
Date: Tue Mar 01 16:47:38 2016

Delete content sandbox tests which exercise handle inheritance

Sandboxing content_browsertests seems to break Win10 bots. It's
not clear why, but ultimately these tests are probably not worth
the trouble: the unsandboxed case is just a glorified base::LaunchProcess
test, and the sandboxed case is allready covered by a policy test
in sbox_integration_tests.

BUG= 590490 

Review URL: https://codereview.chromium.org/1750793002

Cr-Commit-Position: refs/heads/master@{#378455}

[delete] https://crrev.com/f3e3dcffa4704e72b4c3e34d2f10d4f49b097375/content/common/sandbox_win_unittest.cc
[modify] https://crrev.com/b7e5cabccbc6297a67af7960ac4b0d5afe36089d/content/content_tests.gypi

Fixed the glitch

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/bling/chromium.git/+/b7e5cabccbc6297a67af7960ac4b0d5afe36089d

commit b7e5cabccbc6297a67af7960ac4b0d5afe36089d
Author: rockot <rockot@chromium.org>
Date: Tue Mar 01 16:47:38 2016