Patch available in Focal, mark this as fix-released.
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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Title:
32-bit x86
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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Title:
32-bit x86 kernel 4.15.0-50 crash in vmalloc_sync_all
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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
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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Title:
32-bit x86 kernel 4.15.0-50 crash in
I was not able to trigger the crash on linux-
image-4.15.0-55-generic=4.15.0-55.60 from -proposed. Looks like it's
fixed.
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Title:
32-bit x86
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: Confirmed => Fix Committed
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Title:
32-bit x86 kernel 4.15.0-50 crash in vmalloc_sync_all
To
** Description changed:
+ [Impact]
+
+ Commit d653420532d580156c8486686899ea6a9eeb7bf0 in bionic enabled kernel
+ page table isolation for x86_32, but also introduced a kernel bug (the
+ BUG_ON() condition in vmalloc_sync_one()) that seems to happen when
+ vmalloc_sync_all() is called multiple
This module in attach (similar to the one posted by @mjeanson) has been
used as an effective reproducer for this bug. It looks like we need to
reboot the system a couple of times and load this module to immediately
trigger the bug.
** Attachment added: "vmalloc_sync_all() stress test"
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Confirmed
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
--
I built a minimal module that will trigger this bug when loaded/unloaded
in a loop, usually happens in less than 30 seconds.
You can grab it here : https://github.com/mjeanson/boom
Build it with make and run the boom.sh script.
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** Attachment added: "uname-a.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830433/+attachment/5266354/+files/uname-a.log
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Title:
** Attachment added: "lspci-vvnn.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830433/+attachment/5266356/+files/lspci-vvnn.log
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** Attachment added: "version.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830433/+attachment/5266353/+files/version.log
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Title:
** Attachment added: "dmesg.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830433/+attachment/5266355/+files/dmesg.log
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