linux-kernel - Re: modprobe mlx5_core on OCI bare-metal instance causes unrecoverable hang and I/O error

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Message-ID: <CAHTA-uasZ+ZkdzaSzz-QH=brD3PDb+wGfvE-k377SW7BCEi6hg@mail.gmail.com>
Date: Fri, 7 Feb 2025 10:02:46 -0600
From: Mitchell Augustin <mitchell.augustin@...onical.com>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: saeedm@...dia.com, leon@...nel.org, tariqt@...dia.com, 
	andrew+netdev@...n.ch, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	netdev@...r.kernel.org, linux-rdma@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Talat Batheesh <talatb@...dia.com>, 
	Feras Daoud <ferasda@...dia.com>
Subject: Re: modprobe mlx5_core on OCI bare-metal instance causes
 unrecoverable hang and I/O error

> Is it using iscsi/srp/nfs/etc for any filesystems?

Yes, dev sda is using iSCSI:

ubuntu@...t-v4ovk-mitchell-instance-pool-20250205-1119:~$ sudo
iscsiadm -m session -P 3
iSCSI Transport Class version 2.0-870
version 2.1.9
Target: iqn.2015-02.oracle.boot:uefi (non-flash)
Current Portal: 169.254.0.2:3260,1
Persistent Portal: 169.254.0.2:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.2010-04.org.ipxe:080020ff-ffff-ffff-ffff-a8698c179e5c
Iface IPaddress: 10.0.0.254
Iface HWaddress: default
Iface Netdev: default
SID: 1
iSCSI Connection State: LOGGED IN
iSCSI Session State: LOGGED_IN
Internal iscsid Session State: NO CHANGE
*********
Timeouts:
*********
Recovery Timeout: 6000
Target Reset Timeout: 30
LUN Reset Timeout: 30
Abort Timeout: 15
*****
CHAP:
*****
username: <empty>
password: ********
username_in: <empty>
password_in: ********
************************
Negotiated iSCSI params:
************************
HeaderDigest: None
DataDigest: None
MaxRecvDataSegmentLength: 262144
MaxXmitDataSegmentLength: 8192
FirstBurstLength: 65536
MaxBurstLength: 262144
ImmediateData: Yes
InitialR2T: Yes
MaxOutstandingR2T: 1
************************
Attached SCSI devices:
************************
Host Number: 0 State: running
scsi0 Channel 00 Id 0 Lun: 0
scsi0 Channel 00 Id 0 Lun: 1
Attached scsi disk sda State: running



On Fri, Feb 7, 2025 at 9:55 AM Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Wed, Feb 05, 2025 at 05:09:13PM -0600, Mitchell Augustin wrote:
> > Hello,
> >
> > I have identified a bug in the mlx5_core module, or some related component.
> >
> > Doing the following on a freshly provisioned Oracle Cloud bare metal
> > node with this configuration [0] will reliably cause the entire
> > instance to become unresponsive:
> >
> > rmmod mlx5_ib; rmmod mlx5_core; modprobe mlx5_core
> >
> > This also produces the following output:
> >
> > [  331.267175] I/O error, dev sda, sector 35602992 op 0x0:(READ) flags
> > 0x80700 phys_seg 33 prio class 0
>
> Is it using iscsi/srp/nfs/etc for any filesystems?
>
> Jason



-- 
Mitchell Augustin
Software Engineer - Ubuntu Partner Engineering