Disabling verity on Pixel 2 running android-11.0.0_r1 causes boot crash

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Emil Westergren

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Sep 23, 2020, 10:58:15 AM9/23/20

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I have built the android-11.0.0_r1 branch for a Pixel 2 device and can successfully flash the system build to the device. Since I want to remount the vendor partition to get write access I do the following:

adb root

adb disable-verity

adb reboot

During reboot however, I get the following crash:

09-23 10:05:55.521 1809 1809 F DEBUG   : Build fingerprint: 'Android/aosp_walleye/walleye:11/RP1A.200720.009/eng.eweste.20200909.110018:userdebug/test-keys'
09-23 10:05:55.521 1809 1809 F DEBUG   : Revision: 'MP1'
09-23 10:05:55.521 1809 1809 F DEBUG   : ABI: 'arm64'
09-23 10:05:55.521 1809 1809 F DEBUG   : Timestamp: 2020-09-23 10:05:55+0200
09-23 10:05:55.521 1809 1809 F DEBUG   : pid: 1801, tid: 1801, name: surfaceflinger >>> /system/bin/surfaceflinger <<<
09-23 10:05:55.521 1809 1809 F DEBUG   : uid: 1000
09-23 10:05:55.521 1809 1809 F DEBUG   : signal 6 (SIGABRT), code -1 (SI_QUEUE), fault addr --------
09-23 10:05:55.521 1809 1809 F DEBUG   : Abort message: 'eglQueryStringImplementationANDROID(EGL_VERSION) failed'
09-23 10:05:55.521 1809 1809 F DEBUG   :     x0 0000000000000000 x1 0000000000000709 x2 0000000000000006 x3 0000007fd98b0aa0
09-23 10:05:55.521 1809 1809 F DEBUG   :     x4 fefefefefefefeff x5 fefefefefefefeff x6 fefefefefefefeff x7 7f7f7f7f7f7f7f7f
09-23 10:05:55.521 1809 1809 F DEBUG   :     x8 00000000000000f0 x9 00000075de4667f8 x10 ffffff80ffffffdf x11 0000000000000001
09-23 10:05:55.521 1809 1809 F DEBUG   :     x12 0000007fd98b0a70 x13 0000000000000038 x14 0000007fd98b0c40 x15 001e3838963d3b74
09-23 10:05:55.521 1809 1809 F DEBUG   :     x16 00000075de4ffc80 x17 00000075de4e0f20 x18 00000075df930000 x19 00000000000000ac
09-23 10:05:55.521 1809 1809 F DEBUG   :     x20 0000000000000709 x21 00000000000000b2 x22 0000000000000709 x23 00000000ffffffff
09-23 10:05:55.521 1809 1809 F DEBUG   :     x24 0000000000000002 x25 0000000000000001 x26 0000000000000000 x27 0000000000000000
09-23 10:05:55.521 1809 1809 F DEBUG   :     x28 0000000000000000 x29 0000007fd98b0b20
09-23 10:05:55.521 1809 1809 F DEBUG   :     lr 00000075de4940c4 sp 0000007fd98b0a80 pc 00000075de4940f4 pst 0000000000000000
09-23 10:05:55.534 1809 1809 F DEBUG   : backtrace:
09-23 10:05:55.535 1809 1809 F DEBUG   :       #00 pc 000000000004e0f4 /apex/com.android.runtime/lib64/bionic/libc.so (abort+180) (BuildId: c78cdff5b820a550771130d6bde95081)
09-23 10:05:55.535 1809 1809 F DEBUG   :       #01 pc 0000000000006334 /system/lib64/liblog.so (__android_log_default_aborter+12) (BuildId: c92329feece7a2d7fa4d9fb6acc815f9)
09-23 10:05:55.535 1809 1809 F DEBUG   :       #02 pc 0000000000006ec8 /system/lib64/liblog.so (__android_log_assert+336) (BuildId: c92329feece7a2d7fa4d9fb6acc815f9)
09-23 10:05:55.535 1809 1809 F DEBUG   :       #03 pc 000000000018b900 /system/lib64/libsurfaceflinger.so (android::renderengine::gl::GLESRenderEngine::create(android::renderengine::RenderEngineCreationArgs const&)+4000) (BuildId: ec25c5bad8ba139118d5f31ae1ba154c)
09-23 10:05:55.535 1809 1809 F DEBUG   :       #04 pc 000000000018a808 /system/lib64/libsurfaceflinger.so (android::renderengine::RenderEngine::create(android::renderengine::RenderEngineCreationArgs const&)+168) (BuildId: ec25c5bad8ba139118d5f31ae1ba154c)
09-23 10:05:55.535 1809 1809 F DEBUG   :       #05 pc 000000000010a280 /system/lib64/libsurfaceflinger.so (android::SurfaceFlinger::init()+184) (BuildId: ec25c5bad8ba139118d5f31ae1ba154c)
09-23 10:05:55.535 1809 1809 F DEBUG   :       #06 pc 00000000000021a8 /system/bin/surfaceflinger (main+352) (BuildId: 90f19aac502ae7e05183738dd9ef97d1)
09-23 10:05:55.535 1809 1809 F DEBUG   :       #07 pc 00000000000495b4 /apex/com.android.runtime/lib64/bionic/libc.so (__libc_init+108) (BuildId: c78cdff5b820a550771130d6bde95081)

If I enable verity again and reboot, the problem goes away. For some reason the device is unable to boot when verity is disabled.