[Bug 1939665] Re: "apt-get update" fails if another instance is running

[Avi Kivity]

In practice the two processes that run apt-get update are unaware of
each other. When I'm updating of course I wouldn't intentionally run two
instances in parallel. Indeed the other process is likely apt-
daily.service.

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Title:
  "apt-get update" fails if another instance is running

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[Bug 1939665] [NEW] "apt-get update" fails if another instance is running

[Avi Kivity]

Public bug reported:

This snippet:

 sudo apt-get update & sudo apt-get update & wait; wait

will result in one apt-get run succeeding and the other failing on the
lock:

[1] 3006473
[2] 3006474
Hit:1 http://ports.ubuntu.com/ubuntu-ports groovy InRelease
Hit:2 http://ports.ubuntu.com/ubuntu-ports groovy-backports InRelease
Hit:3 http://ports.ubuntu.com/ubuntu-ports groovy-security InRelease
Hit:4 http://ports.ubuntu.com/ubuntu-ports groovy-updates InRelease
Reading package lists... Done
E: Could not get lock /var/lib/apt/lists/lock. It is held by process 3006476 
(apt-get)
N: Be aware that removing the lock file is not a solution and may break your 
system.
E: Unable to lock directory /var/lib/apt/lists/
Reading package lists... Done
[1]-  Donesudo apt-get update
[2]+  Exit 100sudo apt-get update


Note that apt-get upgrade will correctly wait.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: apt 2.1.10ubuntu0.3
ProcVersionSignature: Ubuntu 5.8.0-48.54-generic 5.8.18
Uname: Linux 5.8.0-48-generic aarch64
ApportVersion: 2.20.11-0ubuntu50.7
Architecture: arm64
CasperMD5CheckResult: skip
Date: Thu Aug 12 07:50:16 2021
ProcEnviron:
 LC_TIME=C.UTF-8
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: apt
UpgradeStatus: Upgraded to groovy on 2021-03-25 (139 days ago)

** Affects: apt (Ubuntu)
 Importance: Undecided
 Status: New


** Tags: apport-bug arm64 groovy uec-images

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Title:
  "apt-get update" fails if another instance is running

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[Bug 1577126] [NEW] Missing C++ support library

[Avi Kivity]

Public bug reported:

antlr3 has the C support library, but is missing the C++ support
library.

This prevents scylladb (https://github.com/scylladb/scylla) from
building out of the box.

** Affects: antlr3 (Ubuntu)
 Importance: Undecided
 Status: New

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Title:
  Missing C++ support library

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[Bug 1576101] [NEW] Missing libthrift.so

[Avi Kivity]

Public bug reported:

Ubuntu provides the thrift compiler, bit not the run-time support
library, so C++ applications using thrift cannot be built.

This impacts ScyllaDB (http://github.com/scylladb/scylla) and the C++
driver for Apache Cassandra (https://github.com/datastax/cpp-driver).

Seen in 14.04 and 16.04.

** Affects: thrift-compiler (Ubuntu)
 Importance: Undecided
 Status: New

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Title:
  Missing libthrift.so

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[Bug 1500954] Re: xfs DIO data corruption

[Avi Kivity]

** Package changed: linux-lts-vivid (Ubuntu) => linux-lts-trusty
(Ubuntu)

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Title:
  xfs DIO data corruption

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[Bug 1500954] Re: xfs DIO data corruption

[Avi Kivity]

Any progress on this issue?  This is DATA CORRUPTION!

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Title:
  xfs DIO data corruption

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[Bug 1500954] [NEW] xfs DIO data corruption

[Avi Kivity]

Public bug reported:

An appending DIO write will corrupt files on XFS.

The following patch needs to be backported:

commit b9d59846f73713d77f0f3fb784c7f84249fc2b93
Author: Dave Chinner 
Date:   Thu Apr 16 22:03:07 2015 +1000
 
xfs: DIO write completion size updates race
   
xfs_end_io_direct_write() can race with other IO completions when
updating the in-core inode size. The IO completion processing is not
serialised for direct IO - they are done either under the
IOLOCK_SHARED for non-AIO DIO, and without any IOLOCK held at all
during AIO DIO completion. Hence the non-atomic test-and-set update
of the in-core inode size is racy and can result in the in-core
inode size going backwards if the race if hit just right.
   
If the inode size goes backwards, this can trigger the EOF zeroing
code to run incorrectly on the next IO, which then will zero data
that has successfully been written to disk by a previous DIO.
   
To fix this bug, we need to serialise the test/set updates of the
in-core inode size. This first patch introduces locking around the
relevant updates and checks in the DIO path. Because we now have an
ioend in xfs_end_io_direct_write(), we know exactly then we are
doing an IO that requires an in-core EOF update, and we know that
they are not running in interrupt context. As such, we do not need to
use irqsave() spinlock variants to protect against interrupts while
the lock is held.
   
Hence we can use an existing spinlock in the inode to do this
serialisation and so not need to grow the struct xfs_inode just to
work around this problem.
   
This patch does not address the test/set EOF update in
generic_file_write_direct() for various reasons - that will be done
as a followup with separate explanation.
   
Signed-off-by: Dave Chinner 
Reviewed-by: Brian Foster 
Signed-off-by: Dave Chinner 

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.19.0-25-generic 3.19.0-25.26~14.04.1 [modified: 
boot/vmlinuz-3.19.0-25-generic]
ProcVersionSignature: Ubuntu 3.19.0-25.26~14.04.1-generic 3.19.8-ckt2
Uname: Linux 3.19.0-25-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Sep 29 19:29:28 2015
InstallationDate: Installed on 2015-09-29 (0 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: linux-lts-vivid
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux-lts-vivid (Ubuntu)
 Importance: Undecided
 Status: New


** Tags: amd64 apport-bug trusty

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Title:
  xfs DIO data corruption

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