** Changed in: ubuntu-kernel-tests
Status: New => Fix Released
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Title:
[Potential Regression] System crashes when running ftrace test in
This bug was fixed in the package linux - 5.0.0-27.28
---
linux (5.0.0-27.28) disco; urgency=medium
* disco/linux: 5.0.0-27.28 -proposed tracker (LP: #1840816)
* [Potential Regression] System crashes when running ftrace test in
ubuntu_kernel_selftests (LP: #1840750)
- x86
ubuntu_kernel_selftests.ftrace completed successfully with kernel
5.0.0-27.28.
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
/autopkgtest-disco/disco/amd64/l/linux/20190821_124751_453e6@/log.gz
** Tags removed: verification-needed-disco
** Tags added: v
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-
disco' to 'verification-done-disco'. If the problem still exists, change
the tag 'verificati
** Changed in: linux (Ubuntu Disco)
Status: In Progress => Fix Committed
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Title:
[Potential Regression] System crashes when running ftrace
Eoan already has the fixing commit, so the development series shouldn't
be affected.
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/184
** Description changed:
- This issue is 100% reproducible. It looks like this has something to do
- with the Disco kernel in proposed (5.0.0-1014.14).
+ [Impact]
+ ftrace test in ubuntu_kernel_selftests causes a system crash + reboot when
testing "Register/unregister many kprobe events".
+
+ [Fi
Running tests with the mainline builds the conclusion is that the bug
was introduced with stable v5.0.20. From the thread on comment #4, we
are missing the following fix:
7298e24f9042 x86/kprobes: Set instruction page as executable
I'm building a test kernel to verify it.
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Upstream discussion
https://lkml.org/lkml/2019/6/9/781
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https://bugs.launchpad.net/bugs/1840750
Title:
[Potential Regression] System crashes when running ftrace test in
ubuntu_kernel_
I was able to get some kernel messages from a qemu console:
[ 208.672687] kernel tried to execute NX-protected page - exploit attempt?
(uid: 0)
[ 208.673786] BUG: unable to handle kernel paging request at c054f694
[ 208.674779] #PF error: [PROT] [INSTR]
[ 208.675571] PGD 45a12067 P4D
** Tags added: sru-20190812 ubuntu-kernel-selftests
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Title:
[Potential Regression] System crashes when running ftrace test in
ubuntu_kernel_sel
** Also affects: ubuntu-kernel-tests
Importance: Undecided
Status: New
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Title:
[Potential Regression] System crashes when running ftrac
** Description changed:
This issue is 100% reproducible. It looks like this has something to do
- with the kernel in proposed
+ with the Disco kernel in proposed (5.0.0-1014.14).
- Combinations:
+ Test combinations:
kernel in updates + source code master branch = OK
kernel in proposed + s
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