The userspace regression is fixed in latest available kernels for all series:
Xenial (Trusty-HWE): 4.4.0-143
Bionic (Xenial-HWE): 4.15.0-46
Cosmic (Bionic-HWE): 4.18.0-16
Disco (development series): 5.0.0-7.8
Cheers,
Guilherme
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This bug was fixed in the package linux - 4.19.0-12.13
---
linux (4.19.0-12.13) disco; urgency=medium
* linux: 4.19.0-12.13 -proposed tracker (LP: #1813664)
* kernel oops in bcache module (LP: #1793901)
- SAUCE: bcache: never writeback a discard operation
* Disco update:
This bug was fixed in the package linux - 4.18.0-14.15
---
linux (4.18.0-14.15) cosmic; urgency=medium
* linux: 4.18.0-14.15 -proposed tracker (LP: #1811406)
* CPU hard lockup with rigorous writes to NVMe drive (LP: #1810998)
- blk-wbt: Avoid lock contention and thundering
This bug was fixed in the package linux - 4.4.0-142.168
---
linux (4.4.0-142.168) xenial; urgency=medium
* linux: 4.4.0-142.168 -proposed tracker (LP: #1811846)
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
* iptables connlimit allows more
This bug was fixed in the package linux - 4.4.0-142.168
---
linux (4.4.0-142.168) xenial; urgency=medium
* linux: 4.4.0-142.168 -proposed tracker (LP: #1811846)
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
* iptables connlimit allows more
There was an userspace regression reported after the inclusion of these
backports;
it's being handled in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813873.
The fix patch was released upstream and the SRU request was sent to kernel-team
ML (thanks smb!):
This bug was fixed in the package linux - 4.15.0-44.47
---
linux (4.15.0-44.47) bionic; urgency=medium
* linux: 4.15.0-44.47 -proposed tracker (LP: #1811419)
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
* CPU hard lockup with rigorous writes to
I was able to verify/test in both Bionic and Cosmic proposed kernels,
respectively: 4.15.0-44.47 and 4.18.0-14.15.
I don't have a reproducer, but to exercise the paths modified by the
patches, the following approach was taken:
(a) Open ssh connection to the host/test machine, and run the
We're still pending the Xenial verification; I'm waiting for the trusty-
HWE kernel to be released in -proposed, since we have a user capable of
reproducing the crash in that version, so I'm planning to ask them to
try in the trusty-HWE package.
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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
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
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-
cosmic' to 'verification-done-cosmic'. If the problem still exists,
change the tag
** Changed in: linux (Ubuntu Xenial)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1791758
Title:
ldisc crash on reopened tty
Status in linux
** Changed in: linux (Ubuntu Bionic)
Status: Confirmed => Fix Committed
** Changed in: linux (Ubuntu Cosmic)
Status: Confirmed => Fix Committed
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** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1791758
Title:
ldisc crash on reopened tty
Status in linux
SRU request was submitted to kernel team.
* For Xenial and trusty-HWE (kernel 4.4):
https://lists.ubuntu.com/archives/kernel-team/2019-January/097556.html
* For Bionic (kernel 4.15) and Cosmic (kernel 4.18):
https://lists.ubuntu.com/archives/kernel-team/2019-January/097562.html
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** Description changed:
[Impact]
* Line discipline code is racy when we have buffer being flush while the
tty is being initialized or reinitialized. For the first problem, we
have an upstream patch since January 2018: b027e2298bd5 ("tty: fix data
race between tty_init_dev and flush
** Description changed:
[Impact]
- The following Oops was discovered by user:
+ * Line discipline code is racy when we have buffer being flush while the
+ tty is being initialized or reinitialized. For the first problem, we
+ have an upstream patch since January 2018: b027e2298bd5 ("tty: fix
** Tags removed: xenial
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https://bugs.launchpad.net/bugs/1791758
Title:
ldisc crash on reopened tty
Status in linux package in Ubuntu:
In Progress
Status in linux
** Changed in: linux (Ubuntu Xenial)
Importance: High => Critical
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https://bugs.launchpad.net/bugs/1791758
Title:
ldisc crash on reopened tty
Status in linux package
** Changed in: linux (Ubuntu Trusty)
Status: Confirmed => Won't Fix
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => High
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => High
** Changed in: linux (Ubuntu Cosmic)
Importance: Undecided => High
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** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1791758
Title:
ldisc crash on reopened tty
Status in
** Changed in: linux (Ubuntu Cosmic)
Status: New => Confirmed
** Changed in: linux (Ubuntu Cosmic)
Assignee: (unassigned) => Guilherme G. Piccoli (gpiccoli)
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There's news - a V6 patchset was proposed recently, that address this issue
and there are good chances to get merged:
https://marc.info/?l=linux-kernel=154103190111795
("[PATCHv6 0/7] tty: Hold write ldisc sem in tty_reopen()").
Will update here with SRU request when it gets merged.
Cheers,
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
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Kernel core dump analysis:
crash> set
PID: 23697
COMMAND: "kworker/u82:0"
TASK: 88370bcfaa80 [THREAD_INFO: 883708104000]
CPU: 33
STATE: TASK_RUNNING (PANIC)
crash> bt
PID: 23697 TASK: 88370bcfaa80 CPU: 33 COMMAND: "kworker/u82:0"
[...]
#3 [883708107b78] __bad_area_nosemaphore at
** Description changed:
[Impact]
The following Oops was discovered by user:
[684766.39] BUG: unable to handle kernel paging request at
2268
[684766.667642] IP: [] n_tty_receive_buf_common+0x6a/0xae0
[684766.668487] PGD 8019574fe067 PUD 19574ff067 PMD 0
Quick summary about this issue upstream:
The first thread I found about this dates back to 2016, an user report
followed by some approaches from Peter:
https://lkml.org/lkml/2016/5/16/452
After that, seems the thread died, even with a functional patch, it
wasn't "upstreamed". After about an
** Changed in: linux (Ubuntu)
Milestone: trusty-updates => None
** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Description changed:
+ [Impact]
+
The following Oops was discovered by user:
[684766.39] BUG: unable to handle kernel paging
** Tags added: sts
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https://bugs.launchpad.net/bugs/1791758
Title:
ldisc crash on reopened tty
Status in linux package in Ubuntu:
Confirmed
Bug description:
The
** Attachment added: "Call Trace from dmesg"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1791758/+attachment/5187255/+files/DMESG_CALL_TRACE.log
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** Attachment added: ""bt" and "bt -l" from Kernel crashdump"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1791758/+attachment/5187256/+files/CRASH_BT.log
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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