Bug 200459

Summary:	[nvme] Ioctl for passthrough can hang if called during nvme reset.
Product:	Base System	Reporter:	oren.berman
Component:	misc	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	New ---
Severity:	Affects Only Me	CC:	jimm.grogan, otis
Priority:	---
Version:	10.1-RELEASE
Hardware:	Any
OS:	Any

Description oren.berman 2015-05-26 09:20:39 UTC

The ioctl for PASSTHROUGH in the nvme driver should return an ERROR if the controller is in reset state,for example checking the ctrlr->is_resetting bit, Otherwise the ioctl might hang.

BR
Oren

Comment 1 Juraj Lutter freebsd_committer

2020-11-13 22:00:30 UTC

I'm seeing something similar, a box with 22x nvme and 2x SSD, running either 12-STABLE or 13-CURRENT (as of today). After certain amount of time (and workload), ioctls are hanging, rendering the box almost unresponsive to some operations.

ddb showed that there are two suspects:
mrsas_ocr_thread()
nvme_ctrlr_passthrough_cmd()

the rest of processes and threads are in sched_switch()

OCR is Online Controller Reset.