linux-hwe-5.4 ADT test failure with linux-hwe-5.4 (kernel panic/deadlocked/testbed auxverb failed 255)

[Kelsey Steele]

This is a scripted bug report about ADT failures while running linux-hwe-5.4 tests for linux-hwe-5.4/5.4.0-75.84~18.04.1 on bionic. Whether this is caused by the dep8 tests of the tested source or the kernel has yet to be determined.

B/hwe-5.4 linux-hwe-5.4 i386 often fails with a kernel panic / deadlocked on memory. This is not a regression as it's occurred on previous versions. Appears to be intermittent, though several retries this cycle has ended in this failure.

Testing failed on:
    i386: https://autopkgtest.ubuntu.com/results/autopkgtest-bionic/bionic/i386/l/linux-hwe-5.4/20210618_093016_490db@/log.gz

[ 7814.634369] ? auditd_reset+0x90/0x90
[ 7814.635331] ? kthread_park+0xa0/0xa0
[ 7814.636307] ret_from_fork+0x1c/0x38
[ 7814.637824] Kernel Offset: 0x9000000 from 0xc1000000 (relocation range: 0xc0000000-0xdf5fdfff)
[ 7814.639916] ---[ end Kernel panic - not syncing: System is deadlocked on memory ]---

....

Creating nova instance adt-bionic-i386-linux-hwe-5.4-20210618-021224 from image adt/ubuntu-bionic-i386-server-20210617.img (UUID 6daab94d-cebf-443d-bf0a-1466d4bd9f83)...
Creating nova instance adt-bionic-i386-linux-hwe-5.4-20210618-021224 from image adt/ubuntu-bionic-i386-server-20210617.img (UUID 6daab94d-cebf-443d-bf0a-1466d4bd9f83)...
autopkgtest [09:30:12]: ERROR: testbed failure: testbed auxverb failed with exit code 255