George Amanakis da60484db5 Fix logging in l2arc_rebuild()
In case the L2ARC rebuild was canceled, do not log to spa history
log as the pool may be in the process of being removed and a panic
may occur:

BUG: kernel NULL pointer dereference, address: 0000000000000018
RIP: 0010:spa_history_log_internal+0xb1/0x120 [zfs]
Call Trace:
 l2arc_rebuild+0x464/0x7c0 [zfs]
 l2arc_dev_rebuild_start+0x2d/0x130 [zfs]
 ? l2arc_rebuild+0x7c0/0x7c0 [zfs]
 thread_generic_wrapper+0x78/0xb0 [spl]
 kthread+0xfb/0x130
 ? IS_ERR+0x10/0x10 [spl]
 ? kthread_park+0x90/0x90
 ret_from_fork+0x35/0x40

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #10659
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite Linux distribution can be found at the ZoL Site.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are 12-STABLE and 13-CURRENT.
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