Looks like this failure is occurring intermittently starting on this build:
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Linux%20CFI/builds/5390

Stack trace:
[ RUN      ] GLContextGLXTest.DoNotDestroyOnFailedMakeCurrent
[14381:14397:0123/033233.756849:28412666065:ERROR:kill_posix.cc(84)] Unable to terminate process group 14739: No such process (3)
[14733:14733:0123/033233.730734:28412639948:ERROR:gl_surface_glx.cc(423)] glxQueryVersion failed
[14733:14733:0123/033233.730756:28412639965:ERROR:gl_initializer_x11.cc(157)] GLSurfaceGLX::InitializeOneOff failed.
Received signal 11 SEGV_MAPERR 000000000968
#0 0x0000006a706c base::debug::StackTrace::StackTrace()
#1 0x0000006a6d94 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7f6471d1e330 <unknown>
#3 0x7f64717f4db9 XGetWindowAttributes
#4 0x00000052f93b gl::NativeViewGLSurfaceGLX::Initialize()
#5 0x00000050ea39 gl::InitializeGLSurfaceWithFormat()
#6 0x00000050eaf6 gl::InitializeGLSurface()
#7 0x000000443729 gl::GLContextGLXTest_DoNotDestroyOnFailedMakeCurrent_Test::TestBody()
#8 0x0000004ad5b4 testing::Test::Run()
#9 0x0000004adc6e testing::TestInfo::Run()
#10 0x0000004ae4b2 testing::TestCase::Run()
#11 0x0000004b3773 testing::internal::UnitTestImpl::RunAllTests()
#12 0x0000004b340d testing::UnitTest::Run()
#13 0x0000007a549d base::TestSuite::Run()
#14 0x0000004445e1 _ZN4base8internal7InvokerINS0_9BindStateIMNS_9TestSuiteEFivEJNS0_17UnretainedWrapperIN12_GLOBAL__N_111GlTestSuiteEEEEEEFivEE7RunImplIRKS5_RKNSt3__15tupleIJS9_EEEJLm0EEEEiOT_OT0_NSG_16integer_sequenceImJXspT1_EEEE
#15 0x0000007bc0d0 base::(anonymous namespace)::LaunchUnitTestsInternal()
#16 0x0000007bbf99 base::LaunchUnitTests()
#17 0x000000444287 main
#18 0x7f646d7a6f45 __libc_start_main
#19 0x0000003f802a _start
  r8: 0000000000000000  r9: 00007ffeed6ff988 r10: ffffffffffffff10 r11: 00007f646d90b390
 r12: 00007ffeed6ffd58 r13: 00001dc4c5d03ab0 r14: 000000000052f900 r15: 00007ffeed6fff58
  di: 0000000000000000  si: 0000000003400001  bp: 00007ffeed6ffcd0  bx: 0000000000000000
  dx: 00007ffeed6ffa48  ax: 07d260462666a600  cx: 0000000000000005  sp: 00007ffeed6ffa10
  ip: 00007f64717f4db9 efl: 0000000000010202 cgf: 0000000000000033 erf: 0000000000000004
 trp: 000000000000000e msk: 0000000000000000 cr2: 0000000000000968
[end of stack trace]
Calling _exit(1). Core file will not be generated.
[59/59] GLContextGLXTest.DoNotDestroyOnFailedMakeCurrent (CRASHED)

Possible culprit:
https://chromium.googlesource.com/chromium/src/+/f6031ae8d9b1bebcc3735c51a7384c94265db2bc