Comment 9 for bug 1829963

Clean boot, I can run this test 50+ times without it failing, so I'm thinking it's potentially an earlier test that also contributes to this broken state, for example:

Jul 3 01:32:31 wright-kernel kernel: [ 4069.650382] EXT4-fs (zram0): mounted filesystem with ordered data mode. Opts: (null)
Jul 3 01:35:15 wright-kernel kernel: [ 4233.613182] INFO: task sync:19483 blocked for more than 120 seconds.
Jul 3 01:35:15 wright-kernel kernel: [ 4233.619632] Tainted: P W OE 4.18.0-25-generic #26~18.04.1-Ubuntu
Jul 3 01:35:15 wright-kernel kernel: [ 4233.627312] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635254] sync D 0 19483 19256 0x00000000
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635262] Call trace:
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635274] __switch_to+0x94/0xd8
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635287] __schedule+0x2fc/0x8d8
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635296] schedule+0x2c/0x88
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635302] wb_wait_for_completion+0x8c/0xb8
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635305] sync_inodes_sb+0xb0/0x248
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635310] sync_inodes_one_sb+0x28/0x38
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635315] iterate_supers+0x9c/0x130
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635319] ksys_sync+0x50/0xc0
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635322] sys_sync+0x14/0x20
Jul 3 01:35:15 wright-kernel kernel: [ 4233.635325] el0_svc_naked+0x30/0x34
Jul 3 01:35:59 wright-kernel kernel: [ 4278.202106] zram0: detected capacity change from 43612372992 to 0
Jul 3 01:36:05 wright-kernel kernel: [ 4283.621628] zram0: detected capacity change from 0 to 43613421568