Public bug reported:
[Impact]
Reading speed and duplex sysfs on igc device when it's runtime suspended
will make it stops working. Even kernel panic sometimes.
[Fix]
If igc device is runtime suspended, it means link isn't up, so we can
just report speed as -1 and duplex as unknown.
[Test]
$ cat /sys/class/net/*/speed
Then we'll see:
[ 123.449883] igc 0000:03:00.0 enp3s0: PCIe link lost, device now detached
[ 123.450052] BUG: kernel NULL pointer dereference, address: 0000000000000008
With the fix applied,
$ cat /sys/class/net/*/speed
-1
[Where problems could occur]
Not at all. Reading register when device is runtime suspended is just
wrong. The fix prevents it from happening.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu Focal)
Importance: Medium
Status: Confirmed
** Affects: linux (Ubuntu Groovy)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.10 (Ubuntu Groovy)
Importance: Undecided
Status: Won't Fix
** Affects: linux-oem-5.6 (Ubuntu Groovy)
Importance: Undecided
Status: Won't Fix
** Tags: oem-priority originate-from-1904532 somerville
** Also affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.6 (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.6 (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.10 (Ubuntu Groovy)
Importance: Undecided
Status: New
** Changed in: linux-oem-5.10 (Ubuntu Groovy)
Status: New => Won't Fix
** Changed in: linux-oem-5.6 (Ubuntu Groovy)
Status: New => Won't Fix
** Changed in: linux-oem-5.10 (Ubuntu)
Status: New => Invalid
** Changed in: linux-oem-5.6 (Ubuntu)
Status: New => Invalid
** Changed in: linux (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Groovy)
Status: New => Confirmed
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Groovy)
Importance: Undecided => Medium
** Tags added: oem-priority originate-from-1904532 somerville
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https://bugs.launchpad.net/bugs/1906851
Title:
Fix reading speed and duplex sysfs on igc device
Status in HWE Next:
New
Status in linux package in Ubuntu:
New
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Confirmed
Status in linux-oem-5.10 source package in Focal:
Confirmed
Status in linux-oem-5.6 source package in Focal:
Confirmed
Status in linux source package in Groovy:
Confirmed
Status in linux-oem-5.10 source package in Groovy:
Won't Fix
Status in linux-oem-5.6 source package in Groovy:
Won't Fix
Bug description:
[Impact]
Reading speed and duplex sysfs on igc device when it's runtime suspended
will make it stops working. Even kernel panic sometimes.
[Fix]
If igc device is runtime suspended, it means link isn't up, so we can
just report speed as -1 and duplex as unknown.
[Test]
$ cat /sys/class/net/*/speed
Then we'll see:
[ 123.449883] igc 0000:03:00.0 enp3s0: PCIe link lost, device now detached
[ 123.450052] BUG: kernel NULL pointer dereference, address: 0000000000000008
With the fix applied,
$ cat /sys/class/net/*/speed
-1
[Where problems could occur]
Not at all. Reading register when device is runtime suspended is just
wrong. The fix prevents it from happening.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1906851/+subscriptions
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