3 of the last 5 failures at https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20(1) have been this test

https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/builds/24311
https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/builds/24309
https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/builds/24307

hunted back a few more cycles and didn't notice anything suspicious

errors like

[ RUN      ] ZeroconfPrinterDetectorTest.ZeroconfPrinterDetectorStartObservers
[16925:16925:1022/180222.208971:2247101837:FATAL:message_loop.h(506)] Check failed: MessageLoop::TYPE_IO == loop->type() (3 vs. 1)
#0 0x000000a75791 (/b/s/w/ir/out/Release/unit_tests+0xa75790)
#1 0x000011d11c2c (/b/s/w/ir/out/Release/unit_tests+0x11d11c2b)
#2 0x000011d68c5f (/b/s/w/ir/out/Release/unit_tests+0x11d68c5e)
#3 0x000007e091b0 (/b/s/w/ir/out/Release/unit_tests+0x7e091af)
etc.