Thanks for your prompt work on this.

I enabled the proposed repository and have upgraded the zfs packages. As
this fix is in the zfs kernel module, I thought I would need to update
the kernel packages too:

```
$ dpkg-query -S /lib/modules/5.4.0-89-generic/kernel/zfs/zfs.ko
linux-modules-5.4.0-89-generic: /lib/modules/5.4.0-89-generic/kernel/zfs/zfs.ko
```

I upgraded to `linux-image-5.4.0-90-generic`, but the module version
looks to be old:

```
[    4.366482] ZFS: Loaded module v0.8.3-1ubuntu12.12, ZFS pool version 5000, 
ZFS filesystem version 5

$ uname -r
5.4.0-90-generic
```

I would have expected that version to be `0.8.3-1ubuntu12.14`. Any
suggestions?

```
$ dpkg -l | grep zfs
ii  libzfs2linux                         0.8.3-1ubuntu12.14                    
amd64        OpenZFS filesystem library for Linux
ii  zfs-auto-snapshot                    1.2.4-2                               
all          ZFS automatic snapshot service
ii  zfs-initramfs                        0.8.3-1ubuntu12.14                    
amd64        OpenZFS root filesystem capabilities for Linux - initramfs
ii  zfs-zed                              0.8.3-1ubuntu12.14                    
amd64        OpenZFS Event Daemon
ii  zfsutils-linux                       0.8.3-1ubuntu12.14                    
amd64        command-line tools to manage OpenZFS filesystems
```

```
$ dpkg -l | grep linux- | grep -v '^rc'
ii  linux-base                           4.5ubuntu3.6                          
all          Linux image base package
ii  linux-firmware                       1.187.19                              
all          Firmware for Linux kernel drivers
ii  linux-image-5.4.0-88-generic         5.4.0-88.99                           
amd64        Signed kernel image generic
ii  linux-image-5.4.0-89-generic         5.4.0-89.100                          
amd64        Signed kernel image generic
ii  linux-image-5.4.0-90-generic         5.4.0-90.101                          
amd64        Signed kernel image generic
ii  linux-image-generic                  5.4.0.89.93                           
amd64        Generic Linux kernel image
ii  linux-modules-5.4.0-88-generic       5.4.0-88.99                           
amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii  linux-modules-5.4.0-89-generic       5.4.0-89.100                          
amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii  linux-modules-5.4.0-90-generic       5.4.0-90.101                          
amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii  linux-modules-extra-5.4.0-88-generic 5.4.0-88.99                           
amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii  linux-modules-extra-5.4.0-89-generic 5.4.0-89.100                          
amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
```

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https://bugs.launchpad.net/bugs/1946686

Title:
  Fix zfs_get_data access to files with wrong generation causing panics

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