This looks like a flake in compilation. I think that this belongs to Troopers, but I could be wrong.

Link to actual build: https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Mac/builds/14172

Failed command:

[9024/26659] LINK ./genstring
FAILED: genstring genstring.dSYM genstring.dSYM/Contents/Info.plist genstring.dSYM/Contents/Resources/DWARF/genstring 
TOOL_VERSION=1468933906 ../../build/toolchain/mac/linker_driver.py /b/c/cipd/goma/gomacc ../../third_party/llvm-build/Release+Asserts/bin/clang++  -Wcrl,dsym,.  -stdlib=libc++ -arch x86_64 -Wl,-dead_strip -isysroot /b/c/b/Google_Chrome_Mac/src/build/mac_files/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -mmacosx-version-min=10.7 -Wl,-ObjC -Wl,-pie -Wcrl,strip,-x,-S -o "./genstring" -Wl,-filelist,"./genstring.rsp"  
dsymutil(16579,0x7fff78a7f310) malloc: *** error for object 0x7fa5e05007f0: incorrect checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
Traceback (most recent call last):
  File "../../build/toolchain/mac/linker_driver.py", line 222, in <module>
    Main(sys.argv)
  File "../../build/toolchain/mac/linker_driver.py", line 78, in Main
    linker_driver_outputs += linker_driver_actions[name](args)
  File "../../build/toolchain/mac/linker_driver.py", line 112, in <lambda>
    lambda full_args: action(sub_arg[len(name):], full_args))
  File "../../build/toolchain/mac/linker_driver.py", line 138, in RunDsymUtil
    subprocess.check_call(['xcrun', 'dsymutil', '-o', dsym_out, linker_out])
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 542, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['xcrun', 'dsymutil', '-o', './genstring.dSYM', './genstring']' returned non-zero exit status -6


Did you change our Xcode version recently?

Justin was working on hermetic, which *would* change the toolchain. I think he may have recently pushed a new xcode/SDK pair?

I haven't changed anything today (or this week)

Build is green now...