make -C tools/testing/selftests TARGETS="drivers/net/hw" TEST_PROGS=loopbaack.sh TEST_GEN_PROGS="" run_tests
make: Entering directory '/home/virtme/testing-22/tools/testing/selftests'
make[1]: Entering directory '/home/virtme/testing-22/tools/testing/selftests/drivers/net/hw'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/virtme/testing-22/tools/testing/selftests/drivers/net/hw'
make[1]: Entering directory '/home/virtme/testing-22/tools/testing/selftests/drivers/net/hw'
TAP version 13
1..1
# overriding timeout to 360
# selftests: drivers/net/hw: loopback.sh
# Error: Unknown device type.
# Failed to create netif
not ok 1 selftests: drivers/net/hw: loopback.sh # exit=1
make[1]: Leaving directory '/home/virtme/testing-22/tools/testing/selftests/drivers/net/hw'
make: Leaving directory '/home/virtme/testing-22/tools/testing/selftests'
xx__-> echo $?
0
xx__-> echo scan > /sys/kernel/debug/kmemleak && cat /sys/kernel/debug/kmemleak
xx__-> echo scan > /sys/kernel/debug/kmemleak && cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff88800a7e4c40 (size 176):
  comm "bash", pid 1259, jiffies 4294814460
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 90bd2855):
    kmem_cache_alloc_noprof+0x2ad/0x350
    prepare_creds+0x29/0x4a0
    prepare_exec_creds+0x11/0x250
    bprm_execve+0x5f/0x540
    do_execveat_common.isra.0+0x3f5/0x550
    __x64_sys_execve+0x8e/0xb0
    do_syscall_64+0xc1/0x1d0
    entry_SYSCALL_64_after_hwframe+0x77/0x7f
xx__->