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Running stress-test test_2 in mtd-utils on ubi device, sometimes we can
get following oops message:

  BUG: unable to handle page fault for address: ffffffff00000140
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 280a067 P4D 280a067 PUD 0
  Oops: 0000 [#1] SMP
  CPU: 0 PID: 60 Comm: kworker/u16:1 Kdump: loaded Not tainted 5.2.0 #13
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0
  -0-ga698c8995f-prebuilt.qemu.org 04/01/2014
  Workqueue: writeback wb_workfn (flush-ubifs_0_0)
  RIP: 0010:rb_next_postorder+0x2e/0xb0
  Code: 80 db 03 01 48 85 ff 0f 84 97 00 00 00 48 8b 17 48 83 05 bc 80 db
  03 01 48 83 e2 fc 0f 84 82 00 00 00 48 83 05 b2 80 db 03 01 <48> 3b 7a
  10 48 89 d0 74 02 f3 c3 48 8b 52 08 48 83 05 a3 80 db 03
  RSP: 0018:ffffc90000887758 EFLAGS: 00010202
  RAX: ffff888129ae4700 RBX: ffff888138b08400 RCX: 0000000080800001
  RDX: ffffffff00000130 RSI: 0000000080800024 RDI:...