Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 UID: 0 PID: 18216 Comm: syz.0.2949 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__drm_fb_helper_restore_fbdev_mode_unlocked+0x124/0x1c0 drivers/gpu/drm/drm_fb_helper.c:149
Code: 8d b3 e0 00 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 fa 36 97 fc 4d 8b 36 49 83 c6 08 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 dd 36 97 fc 4d 8b 36 4d 85 f6 74
RSP: 0018:ffffc90004bc7c60 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff888026e83800 RCX: 1ffff92000978f74
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: 00000000fffffff0 R08: ffffc90004bc7be7 R09: 1ffff92000978f7c
R10: dffffc0000000000 R11: fffff52000978f7d R12: dffffc0000000000
R13: 1ffff11004dd0753 R14: 0000000000000008 R15: ffff888026e83a98
FS:  000055556d227500(0000) GS:ffff888124dd9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c36982d CR3: 000000002bc80000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 drm_fbdev_client_restore+0x1b/0x30 drivers/gpu/drm/clients/drm_fbdev_client.c:45
 drm_client_dev_restore+0x14c/0x290 drivers/gpu/drm/drm_client_event.c:118
 drm_lastclose drivers/gpu/drm/drm_file.c:408 [inline]
 drm_release+0x32d/0x400 drivers/gpu/drm/drm_file.c:441
 __fput+0x418/0xa50 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc35cb9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc35cf4fba8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fc35cf4fc90 RCX: 00007fc35cb9e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000b4dd0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32420000 R11: 0000000000000246 R12: 00007fc35cf4fcd0
R13: 00007fc35ce25fac R14: 00000000000b5471 R15: 00007fc35ce25fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__drm_fb_helper_restore_fbdev_mode_unlocked+0x124/0x1c0 drivers/gpu/drm/drm_fb_helper.c:149
Code: 8d b3 e0 00 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 fa 36 97 fc 4d 8b 36 49 83 c6 08 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 dd 36 97 fc 4d 8b 36 4d 85 f6 74
RSP: 0018:ffffc90004bc7c60 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff888026e83800 RCX: 1ffff92000978f74
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: 00000000fffffff0 R08: ffffc90004bc7be7 R09: 1ffff92000978f7c
R10: dffffc0000000000 R11: fffff52000978f7d R12: dffffc0000000000
R13: 1ffff11004dd0753 R14: 0000000000000008 R15: ffff888026e83a98
FS:  000055556d227500(0000) GS:ffff888124dd9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f10135ef2f8 CR3: 000000002bc80000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	8d b3 e0 00 00 00    	lea    0xe0(%rbx),%esi
   6:	4c 89 f0             	mov    %r14,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  12:	74 08                	je     0x1c
  14:	4c 89 f7             	mov    %r14,%rdi
  17:	e8 fa 36 97 fc       	call   0xfc973716
  1c:	4d 8b 36             	mov    (%r14),%r14
  1f:	49 83 c6 08          	add    $0x8,%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 dd 36 97 fc       	call   0xfc973716
  39:	4d 8b 36             	mov    (%r14),%r14
  3c:	4d 85 f6             	test   %r14,%r14
  3f:	74                   	.byte 0x74