Kernel panic's at qxl_release_list_add() during DB backup and restore

Issue

• The system is getting panic with below call traces.

[83270.522961] XFS (cvblk300): Ending clean mount
[83625.933563] XFS (cvblk0): Unmounting Filesystem
[83733.716834] 17044: ERROR: cvblk_bstore_open_temp(): Couldn't open /opt/commvault/iDataAgent64/jobResults/PseudoMount/Transient/PseudoDevices/MountableDevices/GFL_1619512840_9/Private/tmp/temp1969: rc=-28
[83733.717423] XFS (cvblk200): writeback error on sector 32532304
[83733.718470] BUG: unable to handle kernel NULL pointer dereference at 00000000000000fd
[83733.718618] IP: [<ffffffffc029801d>] qxl_release_list_add+0x2d/0xc0 [qxl]
[83733.718799] PGD 0 
[83733.718907] Oops: 0000 [#1] SMP 
..
[83733.720441] Hardware name: Red Hat RHEV Hypervisor, BIOS 1.11.0-2.el7 04/01/2014
[83733.720659] Workqueue: events drm_fb_helper_dirty_work [drm_kms_helper]
[83733.720794] task: ffff9fd58a3c3150 ti: ffff9fd0160cc000 task.ti: ffff9fd0160cc000
[83733.720926] RIP: 0010:[<ffffffffc029801d>]  [<ffffffffc029801d>] qxl_release_list_add+0x2d/0xc0 [qxl]
..
[83733.722158] Call Trace:
[83733.722314]  [<ffffffffc0294f18>] qxl_alloc_bo_reserved+0x58/0xb0 [qxl]
[83733.722454]  [<ffffffffc0295b69>] qxl_image_alloc_objects+0x69/0x140 [qxl]
[83733.722591]  [<ffffffffc029613e>] qxl_draw_opaque_fb+0xce/0x3d0 [qxl]
[83733.722725]  [<ffffffffc02935ac>] qxlfb_framebuffer_dirty+0xdc/0x170 [qxl]
[83733.722868]  [<ffffffffc02d5913>] drm_fb_helper_dirty_work+0x143/0x170 [drm_kms_helper]
[83733.723053]  [<ffffffffaa6be21f>] process_one_work+0x17f/0x440
[83733.723192]  [<ffffffffaa6bf336>] worker_thread+0x126/0x3c0
[83733.723318]  [<ffffffffaa6bf210>] ? manage_workers.isra.26+0x2a0/0x2a0
[83733.723456]  [<ffffffffaa6c61f1>] kthread+0xd1/0xe0
[83733.723577]  [<ffffffffaa6c6120>] ? insert_kthread_work+0x40/0x40
[83733.723738]  [<ffffffffaad8dd37>] ret_from_fork_nospec_begin+0x21/0x21
[83733.723870]  [<ffffffffaa6c6120>] ? insert_kthread_work+0x40/0x40
[83733.724002] Code: 66 66 90 55 48 89 e5 41 56 41 55 49 89 f5 41 54 49 89 fc 53 48 8b 87 90 00 00 00 48 8d 9f 90 00 00 00 48 39 d8 74 1d 48 8d 56 58 <48> 39 50 10 75 0b eb 6b 0f 1f 00 48 39 50 10 74 62 48 8b 00 48 
[83733.724638] RIP  [<ffffffffc029801d>] qxl_release_list_add+0x2d/0xc0 [qxl]
[83733.726799]  RSP <ffff9fd0160cfbc0>
[83733.728295] CR2: 00000000000000fd