Arch Linux

yourself

Member

Registered: 2008-10-23

Posts: 120

3.18.2 (and 3.18.3) panic upon usb storage disconnect

Hello,

I'm running a fully up-to-date arch linux on a Thinkpad T420i. When I upgraded to 3.18.2 (even tried 3.18.3 from testing) I can reproduce the following behaviour everytime:

1. Plug an NTFS-formatted usb 1TB WD Passport disk.
2. Unplug it (without ever mounting it)
3. Kernel panic!

Note: other disks or usb sticks do not reproduce this issue. I can't think of why.

This happens even when X is not running and nothing gets automounted. Whatsmore, the kernel's call stack is quite large and easily fills the entire screen (with KMS and native resolution which gives about 56 lines of text) and scrolls away, leaving just the last lines of the call stack and removing the initial problem as reported by the kernel. What can I do to diagnose this issue?

Thanks

jasonwryan

Anarchist

From: .nz

Registered: 2009-05-09

Posts: 30,426

Website

Re: 3.18.2 (and 3.18.3) panic upon usb storage disconnect

What is in the journal immediately prior to the panic?

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yourself

Member

Registered: 2008-10-23

Posts: 120

Re: 3.18.2 (and 3.18.3) panic upon usb storage disconnect

[Edit] The last time I did it, the journal also cought a NULL pointer dereference, as can be seen in the (updated) attached photo.

The last journal line is:

kernel: usb 2-1.2: USB disconnect, device number 3

After that, the system is completely frozen.

The full log (as a bad photo) can be seen here: https://dl.dropboxusercontent.com/u/63420/journal.jpg

Last edited by yourself (2015-01-24 08:40:15)

malcolmsparks

Member

From: London

Registered: 2012-11-04

Posts: 4

Website

Re: 3.18.2 (and 3.18.3) panic upon usb storage disconnect

For what it's worth, I have a T420 and have experienced several kernel panics recently on 3.18.2 and 3.18.3 too.

It is frequently (but not always) crashing on system boot. It's not with USB storage but does seem to panic around the time it usually mounts NFS disks, so I wonder if there's a problem in mounting file-systems.

I've commented out my NFS mounts in /etc/fstab to see if that helps.

I'm not experienced at debugging at this level, are there any good Arch resources someone can point me to?