https://uberchromegw.corp.google.com/i/chromeos/builders/gcc-toolchain-group/builds/82

It failed because of running out of loopback devices.

07/26 19:51:49.430 DEBUG|        base_utils:0278| [stdout] [pid:25236] Generating new encryption key.
07/26 19:51:49.431 DEBUG|        base_utils:0278| [stdout] [pid:25236] Creating sparse backing file with size 3130396672.
07/26 19:51:49.432 DEBUG|        base_utils:0278| [stdout] [pid:25236] Loopback attaching /mnt/stateful_partition/.test-enc-stateful-ipMQk8/mnt/stateful_partition/encrypted.block (named encstateful_69ba00906b24a5051).
07/26 19:51:49.434 DEBUG|        base_utils:0278| [stdout] ERROR[pid:25236] loop_locate (../../../cryptohome-0.0.1/platform2/cryptohome/mount-helpers.c, 264): Ran out of loopback devices
07/26 19:51:49.435 DEBUG|        base_utils:0278| [stdout] ERROR[pid:25236] setup_encrypted (../../../cryptohome-0.0.1/platform2/cryptohome/mount-encrypted.c, 838): loop_attach failed
07/26 19:51:49.436 DEBUG|        base_utils:0278| [stdout] [pid:25236] Done.
07/26 19:51:49.438 DEBUG|        base_utils:0185| Running 'mv /dev/tpm0.off /dev/tpm0'
07/26 19:51:49.450 INFO |platform_Encrypted:0020| ok: /mnt/stateful_partition/.test-enc-stateful-ipMQk8/mnt/stateful_partition/encrypted.block exists
07/26 19:51:49.451 ERROR|platform_Encrypted:0023| FAIL: could not satisfy '/mnt/stateful_partition/.test-enc-stateful-ipMQk8/mnt/stateful_partition/encrypted.needs-finalization exists'

Labeling with Build-Toolchain because it blocks gcc-toolchain-group.