** Tags removed: verification-needed-cosmic
** Tags added: verification-done-cosmic
** Changed in: ubuntu-kernel-tests
Status: In Progress => Fix Released
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This bug was fixed in the package linux - 4.15.0-51.55
---
linux (4.15.0-51.55) bionic; urgency=medium
* linux: 4.15.0-51.55 -proposed tracker (LP: #1829219)
* disable a.out support (LP: #1818552)
- [Config] Disable a.out support
* [UBUNTU] qdio: clear intparm during
This bug was fixed in the package linux - 4.18.0-21.22
---
linux (4.18.0-21.22) cosmic; urgency=medium
* linux: 4.18.0-21.22 -proposed tracker (LP: #1829186)
* disable a.out support (LP: #1818552)
- [Config] Turn off a.out support
* ftrace in ubuntu_kernel_selftests hang
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
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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https://bugs.launchpad.net/bugs/1826385
Title:
ftrace in ubuntu_kernel_selftests hang with Cosmic
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
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Cosmic)
Status: In Progress => Fix Committed
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https://lists.ubuntu.com/archives/kernel-team/2019-May/100573.html
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Description changed:
== Justification ==
Running the ftrace in ubuntu_kernel_selftests repetitively against x86 Cosmic
kernel will cause system hang.
** Description changed:
== Justification ==
Running the ftrace in ubuntu_kernel_selftests repetitively against x86 Cosmic
kernel will cause system hang.
+ When this happens, you won't be able to ssh into this system, and no log
+ can be found in syslog.
+
This hang is caused by one of
** Description changed:
== Justification ==
Running the ftrace in ubuntu_kernel_selftests repetitively against x86 Cosmic
kernel will cause system hang.
This hang is caused by one of the sub-test: kprobe/multiple_kprobes
Upstream discussion could be found here:
This can be triggered on Cosmic with a OEM kernel built with gcc-8:
$ cat /proc/version
Linux version 4.15.0-1036-oem (root@rumford) (gcc version 8.2.0 (Ubuntu
8.2.0-7ubuntu1)) #41 SMP Tue Apr 30 10:57:32 UTC 2019
I will see if I can verify this from this point.
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** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1826385
Title:
ftrace in ubuntu_kernel_selftests hang with Cosmic kernel
To
** Description changed:
+ == Justification ==
+ Running the ftrace in ubuntu_kernel_selftests repetitively against x86 Cosmic
kernel will cause system hang.
+
+ This hang is caused by one of the sub-test: kprobe/multiple_kprobes
+
+ Upstream discussion could be found here:
+
Tried to reproduce this on Bionic with ubuntu-bionic source code and
ubuntu-cosmic source code, but no luck.
I assume this has something to do with the tool chain, as mentioned in
the mail thread this will get triggered after gcc upgraded from 7 to 8.
Bionic comes with GCC-7
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** Changed in: linux (Ubuntu Cosmic)
Status: New => In Progress
** Changed in: linux (Ubuntu Cosmic)
Assignee: (unassigned) => Po-Hsu Lin (cypressyew)
** Changed in: ubuntu-kernel-tests
Assignee: (unassigned) => Po-Hsu Lin (cypressyew)
** Changed in: ubuntu-kernel-tests
More tests on a bare-metal and a KVM node with 4.18.0-18 / -17 / -16 / -11
shows that:
* This issue can be reproduced on these kernels
* Bare metal system tend to pass with the ftrace test on the first run, but it
will hang with the second / third attempt if you run it again
* KVM nodes tend to
I think this patch can get this issue fixed on Cosmic:
https://github.com/torvalds/linux/commit/43a1b0cb4cd6dbfd3cd9c10da663368394d299d8
(found in this thread https://lkml.org/lkml/2018/12/3/1219)
Test kernel:
http://people.canonical.com/~phlin/kernel/lp-1826385-ftrace-hang/
Cosmic KVM and
Checked again on the KVM that I used yesterday for this:
1. ftrace test finished as expected with upstream tree
https://pastebin.ubuntu.com/p/QmQfspFFR5/
2. ubuntu-cosmic master branch with tip at 2e8c30c5 (Ubuntu-4.18.0-18.19)
will hang https://pastebin.ubuntu.com/p/69gHfNpMRF/
3.
I was able to verify that deleting
ftrace/test.d/kprobe/multiple_kprobes.tc allows the remaining ftrace
selftests (from the cosmic kernel tree) to pass. That suggests that the
"Register/unregister many kprobe events" (multiple_kprobes.tc) test is
the test that puts the system into a bad state.
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