Bug 117471

Summary: nvme possible recursive locking detected
Product: Drivers Reporter: crow
Component: OtherAssignee: drivers_other
Status: NEW ---    
Severity: normal CC: kbusch
Priority: P1    
Hardware: x86-64   
OS: Linux   
Kernel Version: 4.6.0-0-rc5-git-fc25.x86_64 Subsystem:
Regression: No Bisected commit-id:
Attachments: backtrace on poweroff or halt

Description crow 2016-05-01 07:44:30 UTC
Created attachment 214821 [details]
backtrace on poweroff or halt

I am using F23 on my Dell XPS 13 9350 (2016) with FHD Display and an i7-6560U CPU.

As there are often GPU Hang problems and crash, i installed rawhide kernel to test with it. But here when i do poweroff, or halt, i get the backtrace/locking detect in Attachment.

It was told me to report it here, if it is an invalid because i use rawhide kernel with stable F23 then please close this Bug.

If you need any other details then the ones in Attachment please let me know.
Comment 1 Keith Busch 2016-05-02 14:57:26 UTC
This is a false positive detection. Though the warning looks alarming, there is no deadlock concern here.

Ming proposed a patch to suppress the warning here:

http://lists.infradead.org/pipermail/linux-nvme/2016-April/004301.html

I don't see this queued up in maintainer's tree yet, so I'll ping the mailing list.
Comment 2 Keith Busch 2016-05-02 16:03:39 UTC
Staged for 4.7. Commit is currently available here:

http://git.kernel.dk/?p=linux-block.git;a=commit;f=drivers/nvme/host/pci.c;h=2e39e0f608c130411f52c9fe5648dbcda5e28528