This is on a nexus 5x running Nougat. It does not happen on any other phone in our lab. Also tried loading older versions of our app (from several months ago) and those versions are also now causing this error, so I know it's not something that we added to the app recently.

Somebody on Stack Overflow seems to have the same problem.
http://stackoverflow.com/questions/40096361/native-crash-of-renderthread-with-signal-6-sigabrt?newreg=8af8e2270c9b4fab8bce30f7f43149ff

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First we get this:
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10-18 10:42:15.415 32304-32433/com.gogobot.gogodroid.mdev E/OpenGLRenderer: Texture is using 0.00B, count = 1
OffscreenBuffer is using 0.00B, count = 0
Layer is using 0.00B, count = 1
10-18 10:42:15.416 32304-32433/com.gogobot.gogodroid.mdev A/OpenGLRenderer: Leaked 2 GPU objects!
10-18 10:42:15.424 866-18913/? I/ActivityManager: Start proc 704:com.google.process.gapps/u0a13 for content provider com.google.android.gsf/.settings.GoogleSettingsProvider
10-18 10:42:15.425 32304-32433/com.gogobot.gogodroid.mdev A/libc: Fatal signal 6 (SIGABRT), code -6 in tid 32433 (RenderThread)

[ 10-18 10:42:15.429 364: 364 W/ ]
debuggerd: handling request: pid=32304 uid=10120 gid=10120 tid=32433

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Then we get this:
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10-18 10:42:15.806 715-715/? A/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
10-18 10:42:15.806 715-715/? A/DEBUG: Build fingerprint: 'google/bullhead/bullhead:7.0/NBD90W/3239497:user/release-keys'
10-18 10:42:15.806 715-715/? A/DEBUG: Revision: 'rev_1.0'
10-18 10:42:15.806 715-715/? A/DEBUG: ABI: 'arm64'
10-18 10:42:15.806 715-715/? A/DEBUG: pid: 32304, tid: 32433, name: RenderThread >>> com.gogobot.gogodroid.mdev <<<
10-18 10:42:15.806 715-715/? A/DEBUG: signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
10-18 10:42:15.825 715-715/? A/DEBUG: Abort message: 'SANDBOX: Adjust is running in Sandbox mode. Use this setting for testing. Don't forget to set the environment to `production` before publishing!'
10-18 10:42:15.825 715-715/? A/DEBUG: x0 0000000000000000 x1 0000000000007eb1 x2 0000000000000006 x3 0000000000000008
10-18 10:42:15.825 715-715/? A/DEBUG: x4 00006e6174736e69 x5 0000000000000000 x6 0000007610dbb000 x7 0000000000000000
10-18 10:42:15.825 715-715/? A/DEBUG: x8 0000000000000083 x9 ffffffffffffffdf x10 0000000000000000 x11 0000000000000001
10-18 10:42:15.825 715-715/? A/DEBUG: x12 0000000000000018 x13 0000000000000000 x14 0000000000000000 x15 0018ce134ebca82c
10-18 10:42:15.825 715-715/? A/DEBUG: x16 000000760e80fed0 x17 000000760e7b9a2c x18 0000000000000400 x19 00000075ebce64f8
10-18 10:42:15.826 715-715/? A/DEBUG: x20 0000000000000006 x21 00000075ebce6450 x22 000000000000000b x23 0000007610197040
10-18 10:42:15.826 715-715/? A/DEBUG: x24 00000000ffffffff x25 00000075d0393280 x26 7fffffffffffffff x27 00000075ee2896b0
10-18 10:42:15.826 715-715/? A/DEBUG: x28 000000760d148878 x29 00000075ebce5ae0 x30 000000760e7b6e58
10-18 10:42:15.826 715-715/? A/DEBUG: sp 00000075ebce5ac0 pc 000000760e7b9a34 pstate 0000000060000000
10-18 10:42:15.849 715-715/? A/DEBUG: backtrace:
10-18 10:42:15.849 715-715/? A/DEBUG: #00 pc 000000000006ba34 /system/lib64/libc.so (tgkill+8)
10-18 10:42:15.849 715-715/? A/DEBUG: #01 pc 0000000000068e54 /system/lib64/libc.so (pthread_kill+64)
10-18 10:42:15.849 715-715/? A/DEBUG: #02 pc 0000000000023ed8 /system/lib64/libc.so (raise+24)
10-18 10:42:15.849 715-715/? A/DEBUG: #03 pc 000000000001c790 /system/lib64/libc.so (abort+52)
10-18 10:42:15.849 715-715/? A/DEBUG: #04 pc 00000000000107f4 /system/lib64/libcutils.so (__android_log_assert+224)
10-18 10:42:15.850 715-715/? A/DEBUG: #05 pc 0000000000054cc0 /system/lib64/libhwui.so
10-18 10:42:15.850 715-715/? A/DEBUG: #06 pc 00000000000350f8 /system/lib64/libhwui.so
10-18 10:42:15.850 715-715/? A/DEBUG: #07 pc 00000000000328c8 /system/lib64/libhwui.so
10-18 10:42:15.850 715-715/? A/DEBUG: #08 pc 0000000000037348 /system/lib64/libhwui.so
10-18 10:42:15.850 715-715/? A/DEBUG: #09 pc 0000000000038434 /system/lib64/libhwui.so
10-18 10:42:15.850 715-715/? A/DEBUG: #10 pc 0000000000039890 /system/lib64/libhwui.so (_ZN7android10uirenderer12renderthread12RenderThread10threadLoopEv+152)
10-18 10:42:15.850 715-715/? A/DEBUG: #11 pc 0000000000012460 /system/lib64/libutils.so (_ZN7android6Thread11_threadLoopEPv+272)
10-18 10:42:15.850 715-715/? A/DEBUG: #12 pc 000000000009bc4c /system/lib64/libandroid_runtime.so (_ZN7android14AndroidRuntime15javaThreadShellEPv+116)
10-18 10:42:15.850 715-715/? A/DEBUG: #13 pc 000000000006863c /system/lib64/libc.so (_ZL15__pthread_startPv+208)
10-18 10:42:15.850 715-715/? A/DEBUG: #14 pc 000000000001d9fc /system/lib64/libc.so (__start_thread+16)