First failure on Android Cronet Builder here:

https://uberchromegw.corp.google.com/i/chromium.android/builders/Android%20Cronet%20Builder%20Asan/builds/1376

This CL seems to have touched related code. I suspect it caused these failures:
https://codereview.chromium.org/2622013002

C 2243.793s Main  ==29256==ABORTING
C 2243.793s Main  [ CRASHED      ]
C 2243.793s Main  [CRASH] DiskCacheBackendTest.TrimInvalidEntry9:
C 2243.793s Main  [ RUN      ] DiskCacheBackendTest.TrimInvalidEntry9
C 2243.793s Main  [WARNING:backend_impl.cc(1563)] Messed up entry found.
C 2243.793s Main  ASAN:DEADLYSIGNAL
C 2243.793s Main  =================================================================
C 2243.793s Main  ==29133==ERROR: AddressSanitizer: SEGV on unknown address 0x00000000 (pc 0x7f752100 bp 0x10652014 sp 0x832900a0 T1254)
C 2243.793s Main  ==29133==The signal is caused by a READ memory access.
C 2243.793s Main  ==29133==Hint: address points to the zero page.
C 2243.793s Main      #0 0x7f752101  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x5b13101)
C 2243.793s Main      #1 0x7f6094ff  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x59ca4ff)
C 2243.793s Main      #2 0x7adfcf53  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x11bdf53)
C 2243.793s Main      #3 0x7f6e9e63  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x5aaae63)
C 2243.793s Main      #4 0x7f6eaab3  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x5aabab3)
C 2243.793s Main      #5 0x7f6f80c3  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x5ab90c3)
C 2243.793s Main      #6 0x7f6f78a7  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x5ab88a7)
C 2243.793s Main      #7 0x7f75ac3f  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x5b1bc3f)
C 2243.793s Main      #8 0x7f770a79  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x5b31a79)
C 2243.793s Main      #9 0x7ce9a85f  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x325b85f)
C 2243.793s Main      #10 0x7f5e80a5  (/data/app-lib/org.chromium.native_test-2/lib_net_unittests__library.so+0x59a90a5)
C 2243.794s Main      #11 0x4411dbcd  (/system/lib/libdvm.so+0x1dbcd)
C 2243.794s Main      #12 0x4414e123  (/system/lib/libdvm.so+0x4e123)
C 2243.794s Main      #13 0x44126fe1  (/system/lib/libdvm.so+0x26fe1)
C 2243.794s Main      #14 0x4412dfa1  (/system/lib/libdvm.so+0x2dfa1)
C 2243.794s Main      #15 0x4412b639  (/system/lib/libdvm.so+0x2b639)
C 2243.794s Main      #16 0x44160581  (/system/lib/libdvm.so+0x60581)
C 2243.794s Main      #17 0x441605a5  (/system/lib/libdvm.so+0x605a5)
C 2243.794s Main      #18 0x4415528b  (/system/lib/libdvm.so+0x5528b)
C 2243.794s Main      #19 0x405ec171  (/system/lib/libc.so+0xd171)
C 2243.794s Main      #20 0x405ec309  (/system/lib/libc.so+0xd309)
C 2243.794s Main      #21 0x72deee0d  (<unknown module>)