With commit aa56a292ce623734ddd30f52d73f527d1f3529b5 (even on 5.3.0-rc8) I can 
get a system freeze during chromium compilation (likely due to jumbo / high 
memory usage). Sysrq still works and CPU/fan is low, so it seems like a 
deadlock? and there's no disk reading. I can't read the dump gotten via kdump 
for some reason, else I would've shown a stacktrace by causing kernel to crash 
via sysrq+c.

I can easily reproduce this freeze in a matter of seconds:

please see https://bugzilla.kernel.org/show_bug.cgi?id=203317#c4

Thanks.
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