This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag
** Tags added: cscc
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https://bugs.launchpad.net/bugs/1825942
Title:
kernel crash : net_sched race condition in tcindex_destroy()
Status in linux package in Ubuntu:
This bug was fixed in the package linux - 4.15.0-55.60
---
linux (4.15.0-55.60) bionic; urgency=medium
* linux: 4.15.0-55.60 -proposed tracker (LP: #1834954)
* Request backport of ceph commits into bionic (LP: #1834235)
- ceph: use atomic_t for ceph_inode_info::i_shared_gen
I have now tested the updated Linux kernel from bionic proposed. The
new kernel seems to solve the problem and the fix appears OK for :
linux-image-generic 4.15.0.55.57 amd64 Generic Linux kernel image
Linux 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64
x86_64 x86_64
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag
Hi Viktor,
These patches were not applied for the SRU cycle "03-Jun through
30-Jun", they are committed now for the cycle starting next week
("01-Jul through 21-Jul"). Please check https://kernel.ubuntu.com/ for
the current schedules.
Thank you.
** Changed in: linux (Ubuntu Bionic)
As I understood it, the fix was unfortunately some days to late for the
he previous Kernel SRU cycle. I then expected the fix to be applied for
the current SRU cycle, that is, 03-Jun through 30-Jun. I still assume
that is the case?
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** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Confirmed
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => High
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) =>
I did expect a change in status to "Fix Committed", indicating that the
fix had been applied?
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Title:
kernel crash : net_sched
Thanks a lot. That's great.
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https://bugs.launchpad.net/bugs/1825942
Title:
kernel crash : net_sched race condition in tcindex_destroy()
Status in linux package in
Fix against bionic submitted to the kernel ML:
https://lists.ubuntu.com/archives/kernel-team/2019-May/100741.html
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Title:
kernel
** Description changed:
+ [Impact]
+
+ It is possible to trigger a NULL pointer dereference in tcindex_delete()
+ with a simple reproducer script, this is because in tcindex_set_parms()
+ when old_r doesn't exist we set the new exts to cr.exts that can be
+ uninitialized, triggering the NULL
** Tags added: bionic cosmic
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Title:
kernel crash : net_sched race condition in tcindex_destroy()
Status in linux package in
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Andrea Righi (arighi)
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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This crash is currently critical when using traffic control (tc) in one
of the Ubuntu LTS releases, bionic and xenial linux-hwe.
I referred to a simple script in the debian bug tracking system that
triggers the kernel crash. In my case a normal shutdown/reboot triggers
the crash, when the kernel
I could have been more explicit. The thread linked to in the initial bug
description also contains a simplified script by Ben Hutchings
that triggers the kernel crash (included below for the
reference):
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=921542#10
The script triggers the kernel
Log files should not be required, as this issue is already confirmed and
also fixed in the Linux kernel.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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I should have added that there were a couple of other commits related to
this issue (memory leaks in cls_tcindex) that were also merged in.
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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