Hey Pavel, Since I yesterday found that weirdness with networking and using a separate flag for compat mode, I went to check everything else. Outside of all the syzbot reproducers not running in 32-bit mode, the only other error was splice: splice: returned -29, expected 16384 basic splice-copy failed test_splice failed -29 0 Test splice failed with ret 227 Can you take a look? I just edit test/Makefile and src/Makefile and add -m32 to the CFLAGS for testing. -- Jens Axboe