[Bug 196223] jdb2 journal - hung after suspend-resume test

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https://bugzilla.kernel.org/show_bug.cgi?id=196223

--- Comment #18 from Tomi Sarvela (tomi.p.sarvela@intel.com) ---
I managed to reproduce the bug on next-20170626 and earlier by running
igt@gem_exec_suspend@basic-s3 test back-to-back, takes ~5 runs. Later
next-kernels reproduce this issue on 1-2 runs.

./scripts/run-tests.sh -vt igt@gem_exec_suspend@basic-s3 -x devices

Issue is seen when igt test returns 'pass', but doesn't drop back to command
line. Repeated Ctrl-C gets to the command prompt. Cached commands work, but
anything that needs disk access doesn't.

linus-v4.12 handled ~10 runs without a problem, then same issue.

Dmesg shows in usual case something like:

[  137.351829] nvme nvme0: I/O 197 QID 0 timeout, disable controller
[  137.464115] nvme nvme0: failed to set APST feature (-4)
[  137.861403] EXT4-fs warning (device nvme0n1p2): ext4_end_bio:322: I/O error
10 writing to inode 1453376 (offset 0 size 4096 starting block 5949696)
[  137.861406] Buffer I/O error on device nvme0n1p2, logical block 5818368

I'm concerned about the 'disable controller' part.

Setup on this testing: KBL-7700K on MSI Z170 mb. Ubuntu base, Intel 600p M.2,
one DP connected to monitor.

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