Public bug reported:
Hello.
On Thu Feb 8, Linux kernel for Ubuntu 16.04.3 LTS has been updated to
the 4.4.0-113.136 version (xenial-proposed). However, after reboot,
plymouth freezes during start, and keys on a keyboard were in-active.
After several seconds, the BusyBox screen appeared. It looks this way:
,------
| BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
| Enter 'help' for a list of built-in commands.
|
| (initramfs) _
`------
Unfortunately, the keyboard does not work and does not respond. The only
way to solve this issue is a "hard reset" and in GRUB menu choosing an
earlier kernel, which is linux 4.4.0-112.135. Now, everything works
okay.
Proposed update to the Linux 4.4.0-113.136 contains many new updates
(please see 1.) It's an i386/x86_32 architecture, which does not contain
PTI yet, right? I'm asking, because mentioned -proposed updates contains
a couple of PTI-related patches and bugs in PTI can cause a few
different signatures of crashes etc. For example:
✗ Crashes in early boot, especially around CPU bringup. Bugs in the trampoline
code or mappings cause these.
✗ Userspace segfaults early in boot, sometimes manifesting as mount(8) failing
to mount the rootfs. These have tended to be TLB invalidation issues. Usually
invalidating the wrong PCID, or otherwise missing an invalidation.
NOTE: if it's about PCID, which is mentioned in a second point, there is
one patch in -proposed update: "x86/mm/32: Move
setup_clear_cpu_cap(X86_FEATURE_PCID) earlier". Maybe that's is the
cause of a boot failure? There are no errors in log files, such as
'/var/log/syslog' or '/var/log/kern.log'. Maybe only that one (but I
have no idea if it's important)?
✗ PCI: Using host bridge windows from ACPI; if necessary, use
"pci=nocrs" and report a bug
If I could provide some more informations, please let me know. Here are
some technical informations:
● Release ('/proc/version_signature'): Ubuntu 4.4.0-112.135-generic 4.4.98
● Architecture: i386/x86_32
● PCI ('lspci -vnvn'): 00:0a.0 PCI bridge [0604]: NVIDIA Corporation MCP73 PCI
Express bridge [10de:056d] (rev a1) (prog-if 01 [Subtractive decode])
Capabilities: [b8] Subsystem: Gigabyte Technology Co., Ltd MCP73 PCI Express
bridge [1458:026f]
Thanks, regards.
________________
1. https://lists.ubuntu.com/archives/xenial-
changes/2018-February/020108.html
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: i386 linux meltdown spectre xenial
** Description changed:
Hello.
On Thu Feb 8, Linux kernel for Ubuntu 16.04.3 LTS has been updated to
the 4.4.0-113.136 version (xenial-proposed). However, after reboot,
plymouth freezes during start, and keys on a keyboard were in-active.
After several seconds, the BusyBox screen appeared. It looks this way:
- ✗
✗ BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
✗ Enter 'help' for a list of built-in commands.
✗
✗ (initramfs) _
- ✗
Unfortunately, the keyboard does not work and does not respond. The only
way to solve this issue is a "hard reset" and in GRUB menu choosing an
earlier kernel, which is linux 4.4.0-112.135. Now, everything works
okay.
Proposed update to the Linux 4.4.0-113.136 contains many new updates
(please see 1.) It's an i386/x86_32 architecture, which does not contain
PTI yet, right? I'm asking, because mentioned -proposed updates contains
a couple of PTI-related patches and bugs in PTI can cause a few
different signatures of crashes etc. For example:
- ✓ Crashes in early boot, especially around CPU bringup. Bugs in the
trampoline code or mappings cause these.
- ✓ Userspace segfaults early in boot, sometimes manifesting as mount(8)
failing to mount the rootfs. These have tended to be TLB invalidation issues.
Usually invalidating the wrong PCID, or otherwise missing an invalidation.
+ ● Crashes in early boot, especially around CPU bringup. Bugs in the
trampoline code or mappings cause these.
+ ● Userspace segfaults early in boot, sometimes manifesting as mount(8)
failing to mount the rootfs. These have tended to be TLB invalidation issues.
Usually invalidating the wrong PCID, or otherwise missing an invalidation.
NOTE: if it's about PCID, which is mentioned in a second point, there is
one patch in -proposed update: "x86/mm/32: Move
setup_clear_cpu_cap(X86_FEATURE_PCID) earlier". Maybe that's is the
cause of a boot failure? There are no errors in log files, such as
'/var/log/syslog' or '/var/log/kern.log'. Maybe only that one (but I
have no idea if it's important)?
✗ PCI: Using host bridge windows from ACPI; if necessary, use
"pci=nocrs" and report a bug
If I could provide some more informations, please let me know. Here are
some technical informations:
- ● Release ('/proc/version_signature'): Ubuntu 4.4.0-112.135-generic 4.4.98
- ● Architecture: i386/x86_32
- ● PCI ('lspci -vnvn'): 00:0a.0 PCI bridge [0604]: NVIDIA Corporation MCP73
PCI Express bridge [10de:056d] (rev a1) (prog-if 01 [Subtractive decode])
Capabilities: [b8] Subsystem: Gigabyte Technology Co., Ltd MCP73 PCI Express
bridge [1458:026f]
+ ✓ Release ('/proc/version_signature'): Ubuntu 4.4.0-112.135-generic 4.4.98
+ ✓Architecture: i386/x86_32
+ ✓ PCI ('lspci -vnvn'): 00:0a.0 PCI bridge [0604]: NVIDIA Corporation MCP73
PCI Express bridge [10de:056d] (rev a1) (prog-if 01 [Subtractive decode])
Capabilities: [b8] Subsystem: Gigabyte Technology Co., Ltd MCP73 PCI Express
bridge [1458:026f]
Thanks, regards.
________________
1. https://lists.ubuntu.com/archives/xenial-
changes/2018-February/020108.html
** Description changed:
Hello.
On Thu Feb 8, Linux kernel for Ubuntu 16.04.3 LTS has been updated to
the 4.4.0-113.136 version (xenial-proposed). However, after reboot,
plymouth freezes during start, and keys on a keyboard were in-active.
After several seconds, the BusyBox screen appeared. It looks this way:
- ✗ BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
- ✗ Enter 'help' for a list of built-in commands.
- ✗
- ✗ (initramfs) _
+ ,------
+ | BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
+ | Enter 'help' for a list of built-in commands.
+ |
+ | (initramfs) _
+ `------
Unfortunately, the keyboard does not work and does not respond. The only
way to solve this issue is a "hard reset" and in GRUB menu choosing an
earlier kernel, which is linux 4.4.0-112.135. Now, everything works
okay.
Proposed update to the Linux 4.4.0-113.136 contains many new updates
(please see 1.) It's an i386/x86_32 architecture, which does not contain
PTI yet, right? I'm asking, because mentioned -proposed updates contains
a couple of PTI-related patches and bugs in PTI can cause a few
different signatures of crashes etc. For example:
- ● Crashes in early boot, especially around CPU bringup. Bugs in the
trampoline code or mappings cause these.
- ● Userspace segfaults early in boot, sometimes manifesting as mount(8)
failing to mount the rootfs. These have tended to be TLB invalidation issues.
Usually invalidating the wrong PCID, or otherwise missing an invalidation.
+ ✗ Crashes in early boot, especially around CPU bringup. Bugs in the
trampoline code or mappings cause these.
+ ✗ Userspace segfaults early in boot, sometimes manifesting as mount(8)
failing to mount the rootfs. These have tended to be TLB invalidation issues.
Usually invalidating the wrong PCID, or otherwise missing an invalidation.
NOTE: if it's about PCID, which is mentioned in a second point, there is
one patch in -proposed update: "x86/mm/32: Move
setup_clear_cpu_cap(X86_FEATURE_PCID) earlier". Maybe that's is the
cause of a boot failure? There are no errors in log files, such as
'/var/log/syslog' or '/var/log/kern.log'. Maybe only that one (but I
have no idea if it's important)?
✗ PCI: Using host bridge windows from ACPI; if necessary, use
"pci=nocrs" and report a bug
If I could provide some more informations, please let me know. Here are
some technical informations:
- ✓ Release ('/proc/version_signature'): Ubuntu 4.4.0-112.135-generic 4.4.98
- ✓Architecture: i386/x86_32
- ✓ PCI ('lspci -vnvn'): 00:0a.0 PCI bridge [0604]: NVIDIA Corporation MCP73
PCI Express bridge [10de:056d] (rev a1) (prog-if 01 [Subtractive decode])
Capabilities: [b8] Subsystem: Gigabyte Technology Co., Ltd MCP73 PCI Express
bridge [1458:026f]
+ ● Release ('/proc/version_signature'): Ubuntu 4.4.0-112.135-generic 4.4.98
+ ● Architecture: i386/x86_32
+ ● PCI ('lspci -vnvn'): 00:0a.0 PCI bridge [0604]: NVIDIA Corporation MCP73
PCI Express bridge [10de:056d] (rev a1) (prog-if 01 [Subtractive decode])
Capabilities: [b8] Subsystem: Gigabyte Technology Co., Ltd MCP73 PCI Express
bridge [1458:026f]
Thanks, regards.
________________
1. https://lists.ubuntu.com/archives/xenial-
changes/2018-February/020108.html
** Tags added: xenial
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https://bugs.launchpad.net/bugs/1748710
Title:
Linux 4.4.0-113.136 (i386/x86_32): failed to boot and BusyBox v1.22.1
built-in shell.
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