System got crashed with error 'RIP [<ffffffffc057dfab>] issue_discard+0x17b/0x200 [dm_thin_pool]'

Issue

• The system crashed with following errors and call traces:

  BUG: unable to handle kernel NULL pointer dereference at           (null)
  IP: [<ffffffffc057dfab>] issue_discard+0x17b/0x200 [dm_thin_pool]
  PGD 355fd067 PUD bb4ee067 PMD 0 
  Oops: 0002 [#1] SMP 
  [...]
  CPU: 1 PID: 14995 Comm: kworker/u16:2 Kdump: loaded Tainted: P           OE  ------------   3.10.0-1160.25.1.el7.x86_64 #1
  Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/28/2020
  Workqueue: dm-thin do_worker [dm_thin_pool]
  task: ffff8f77c20e0000 ti: ffff8f76025d4000 task.ti: ffff8f76025d4000
  RIP: 0010:[<ffffffffc057dfab>]  [<ffffffffc057dfab>] issue_discard+0x17b/0x200 [dm_thin_pool]
  RSP: 0018:ffff8f76025d7b60  EFLAGS: 00010246
  RAX: ffff8f782ee20680 RBX: 0000000000000200 RCX: 0000000000000000
  RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000246
  RBP: ffff8f76025d7bc0 R08: 0000000000000000 R09: 0000000000000000
  R10: 0000000000000004 R11: ffffffffffffffff R12: 0000000000000000
  R13: 0000000000000000 R14: 0000000003dc0380 R15: 0000000000000200
  FS:  0000000000000000(0000) GS:ffff8f783fc40000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000000 CR3: 0000000036486000 CR4: 00000000007607e0
  PKRU: 00000000
  Call Trace:
   [<ffffffffc057fc5a>] process_prepared_discard_passdown_pt1+0x10a/0x1f0 [dm_thin_pool]
   [<ffffffffc057d458>] process_discard_cell_passdown+0x188/0x230 [dm_thin_pool]
   [<ffffffffc057c614>] process_discard_bio+0xe4/0x110 [dm_thin_pool]
   [<ffffffffc0580acb>] do_worker+0x60b/0x9a0 [dm_thin_pool]
   [<ffffffffa56bddcf>] process_one_work+0x17f/0x440
   [<ffffffffa56beee6>] worker_thread+0x126/0x3c0
   [<ffffffffa56bedc0>] ? manage_workers.isra.26+0x2a0/0x2a0
   [<ffffffffa56c5da1>] kthread+0xd1/0xe0
   [<ffffffffa56c5cd0>] ? insert_kthread_work+0x40/0x40
   [<ffffffffa5d95ddd>] ret_from_fork_nospec_begin+0x7/0x21
   [<ffffffffa56c5cd0>] ? insert_kthread_work+0x40/0x40
   [2285721.993412] Code: 00 00 e8 b9 e3 30 e5 4d 85 ed 49 89 c4 74 18 48 89 c6 4c 89 ef e8 56 d4 30 e5 4c 89 ee bf 81 00 00 00 e8 59 78 3d e5 48 8b 45 c8 <4d> 89 34 24 4c 29 fb 49 89 44 24 10 44 89 f8 c1 e0 09 41 89 44 
   [2285721.995255] RIP  [<ffffffffc057dfab>] issue_discard+0x17b/0x200 [dm_thin_pool]
   [2285721.996272]  RSP <ffff8f76025d7b60>
   [2285721.997010] CR2: 0000000000000000