@Colin, sorry for the delay, I just checked and
/sys/module/spl/parameters/spl_taskq_thread_dynamic defaults to 0

That said, the issue happens only occasionally. Since I first reported
it, there was only one other event during which it occurred several
times in a row (between 2018-03-14 and 2018-03-15). I rebooted the VM
and have yet to see it happen again. I still have the logs from those if
that could be of any use to you.

Thanks for taking such good care of ZoL for Ubuntu!

** Changed in: zfs-linux (Ubuntu)
       Status: Incomplete => Confirmed

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   general protection fault in zfs module

Status in Native ZFS for Linux:
Status in zfs-linux package in Ubuntu:

Bug description:
  Got this call trace during a rsync backup of a machine using ZFS:

  general protection fault: 0000 [#1] SMP 
  Modules linked in: ip6table_filter ip6_tables xt_tcpudp xt_conntrack 
iptable_filter ip_tables x_tables zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) 
spl(O) zavl(PO) input_leds sch_fq_codel nf_conntrack_ipv6 nf_defrag_ipv6 
nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack virtio_scsi
  CPU: 0 PID: 4238 Comm: rsync Tainted: P           O    4.4.0-112-generic 
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
Ubuntu-1.8.2-1ubuntu1 04/01/2014
  task: ffff880078a4f2c0 ti: ffff880047c28000 task.ti: ffff880047c28000
  RIP: 0010:[<ffffffffc03135b3>]  [<ffffffffc03135b3>] avl_insert+0x33/0xe0 
  RSP: 0018:ffff880047c2bc20  EFLAGS: 00010246
  RAX: 0000000000000001 RBX: ffff880043b46200 RCX: 0000000000000001
  RDX: 0000000000000000 RSI: 001f880043b46208 RDI: ffff88005aa0c9a8
  RBP: ffff880047c2bc20 R08: 0000000000000000 R09: ffff88007d001700
  R10: ffff880043b46200 R11: 0000000000000246 R12: ffff88005aa0c9a8
  R13: ffff880043b46200 R14: 0000000000000000 R15: ffff88005aa0c9a8
  FS:  00007f04124ec700(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007ffd25c1cb8c CR3: 0000000047cb0000 CR4: 0000000000000670
   ffff880047c2bc68 ffffffffc0313721 0000000000000000 0020000000000008
   ffff880043b46200 ffff88005aa0c8c8 0000000000006b34 0000000000000000
   ffff88005aa0c9a8 ffff880047c2bcc8 ffffffffc04609ee 0000000000000000
  Call Trace:
   [<ffffffffc0313721>] avl_add+0x71/0xa0 [zavl]
   [<ffffffffc04609ee>] zfs_range_lock+0x3ee/0x5e0 [zfs]
   [<ffffffffc0416e4c>] ? rrw_enter_read_impl+0xbc/0x160 [zfs]
   [<ffffffffc0465c90>] zfs_read+0xd0/0x3c0 [zfs]
   [<ffffffff9b39922d>] ? profile_path_perm.part.7+0x7d/0xa0
   [<ffffffffc04818f0>] zpl_read_common_iovec+0x80/0xd0 [zfs]
   [<ffffffffc0482430>] zpl_iter_read+0xa0/0xd0 [zfs]
   [<ffffffff9b211134>] new_sync_read+0x94/0xd0
   [<ffffffff9b211196>] __vfs_read+0x26/0x40
   [<ffffffff9b211756>] vfs_read+0x86/0x130
   [<ffffffff9b2124a5>] SyS_read+0x55/0xc0
   [<ffffffff9b8456c7>] ? entry_SYSCALL_64_after_swapgs+0xd1/0x18c
   [<ffffffff9b8457ad>] entry_SYSCALL_64_fastpath+0x2b/0xe7
  Code: 83 e2 01 48 03 77 10 49 83 e0 fe 8d 04 95 00 00 00 00 55 4c 89 c1 48 83 
47 18 01 83 e0 04 48 83 c9 01 48 89 e5 48 09 c8 4d 85 c0 <48> c7 06 00 00 00 00 
48 c7 46 08 00 00 00 00 48 89 46 10 0f 84 
  RIP  [<ffffffffc03135b3>] avl_insert+0x33/0xe0 [zavl]
   RSP <ffff880047c2bc20>
  ---[ end trace c4ba4478b6002697 ]---

  This is the first time it happens but I'll report any future occurrence in 

  Additional info:

  $ lsb_release -rd
  Description:  Ubuntu 16.04.3 LTS
  Release:      16.04

  $ apt-cache policy linux-image-4.4.0-112-generic zfsutils-linux
    Installed: 4.4.0-112.135
    Candidate: 4.4.0-112.135
    Version table:
   *** 4.4.0-112.135 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 
          500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
          100 /var/lib/dpkg/status
    Version table:
   *** 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 
          100 /var/lib/dpkg/status 500
          500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-112-generic 4.4.0-112.135
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Uname: Linux 4.4.0-112-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
   total 0
   crw-rw---- 1 root audio 116,  1 Feb 14 16:19 seq
   crw-rw---- 1 root audio 116, 33 Feb 14 16:19 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: [Errno 2] No such file or directory: 'fuser'
  CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read 
kernel buffer failed: Operation not permitted
  Date: Thu Feb 15 08:45:07 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lspci: Error: [Errno 2] No such file or directory: 'lspci'
  Lsusb: Error: [Errno 2] No such file or directory: 'lsusb'
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
   PATH=(custom, no user)
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-112-generic 
root=UUID=db4864d4-cc2e-40c7-bc2b-a14bc0f09c9f ro console=ttyS0 net.ifnames=0 
kaslr nmi_watchdog=0 possible_cpus=1 vsyscall=none pti=on
   linux-restricted-modules-4.4.0-112-generic N/A
   linux-backports-modules-4.4.0-112-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-2.5
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-2.5
  dmi.sys.vendor: QEMU

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