Crashes during content_shell startup. Also when running run-webkit-tests.

DevTools listening on ws://127.0.0.1:42149/devtools/browser/e8fe17d7-77db-46a0-a85e-fd297d63f8a0
[3821:3843:1130/122248.137450:ERROR:nss_util.cc(724)] After loading Root Certs, loaded==false: NSS error code: -8018
[3821:3843:1130/122248.143713:ERROR:instance.cc(49)] Unable to locate service manifest for metrics
[3821:3843:1130/122248.143774:ERROR:service_manager.cc(890)] Failed to resolve service name: metrics
[3847:3847:1130/122257.447789:ERROR:gpu_info.cc(103)] No active GPU found, returning primary GPU.
[3847:3847:1130/122257.450422:FATAL:sandbox_linux.cc(203)] Check failed: sandbox::Credentials::MoveToNewUserNS(). 
#0 0x7f79ca5da0fd base::debug::StackTrace::StackTrace()
#1 0x7f79ca5da04c base::debug::StackTrace::StackTrace()
#2 0x7f79ca6822da logging::LogMessage::~LogMessage()
#3 0x7f79c5526fb3 service_manager::SandboxLinux::EngageNamespaceSandbox()
#4 0x7f79cba85a4c content::GpuProcessPreSandboxHook()
#5 0x7f79cba8506f _ZN4base8internal13FunctorTraitsIPFbPN15service_manager13BPFBasePolicyENS2_12SandboxLinux7OptionsEEvE6InvokeIJS4_S6_EEEbS8_DpOT_
#6 0x7f79cba85000 _ZN4base8internal12InvokeHelperILb0EbE8MakeItSoIPFbPN15service_manager13BPFBasePolicyENS4_12SandboxLinux7OptionsEEJS6_S8_EEEbOT_DpOT0_
#7 0x7f79cba84fb1 _ZN4base8internal7InvokerINS0_9BindStateIPFbPN15service_manager13BPFBasePolicyENS3_12SandboxLinux7OptionsEEJEEES8_E7RunImplIS9_NSt3__15tupleIJEEEJEEEbOT_OT0_NSD_16integer_sequenceImJXspT1_EEEEOS5_OS7_
#8 0x7f79cba84f19 _ZN4base8internal7InvokerINS0_9BindStateIPFbPN15service_manager13BPFBasePolicyENS3_12SandboxLinux7OptionsEEJEEES8_E7RunOnceEPNS0_13BindStateBaseES5_OS7_
#9 0x7f79c552adae _ZNO4base12OnceCallbackIFbPN15service_manager13BPFBasePolicyENS1_12SandboxLinux7OptionsEEE3RunES3_S5_
#10 0x7f79c552806b service_manager::SandboxLinux::StartSeccompBPF()
#11 0x7f79c55296f6 service_manager::SandboxLinux::InitializeSandbox()
#12 0x7f79cba834f1 content::(anonymous namespace)::StartSandboxLinux()
#13 0x7f79cba83339 content::(anonymous namespace)::ContentSandboxHelper::EnsureSandboxInitialized()
#14 0x7f79c89d694e gpu::GpuInit::InitializeAndStartSandbox()
#15 0x7f79cba81814 content::GpuMain()
#16 0x7f79ce78f638 content::RunNamedProcessTypeMain()
#17 0x7f79ce79222a content::ContentMainRunnerImpl::Run()
#18 0x7f79ce7886ed content::ContentServiceManagerMainDelegate::RunEmbedderProcess()
#19 0x7f79c50fc89d service_manager::Main()
#20 0x7f79ce78e47f content::ContentMain()
#21 0x00000055f161 main
#22 0x7f79bb10d2b1 __libc_start_main
#23 0x00000055f02a _start

Introduced by https://chromium-review.googlesource.com/c/chromium/src/+/776001

This happens on a computer that I've been using for Chromium development for years. I have no problems on my other computers. This is Debian Stretch with NVIDIA Corporation GK104 [GeForce GTX 760].