------------[ cut here ]------------
[CRTC:37:crtc-0] vblank wait timed out
WARNING: drivers/gpu/drm/drm_atomic_helper.c:1922 at drm_atomic_helper_wait_for_vblanks+0x790/0x900, CPU#0: syz.4.1092/8708
Modules linked in:
CPU: 0 UID: 0 PID: 8708 Comm: syz.4.1092 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:drm_atomic_helper_wait_for_vblanks+0x7c9/0x900
Code: 8d 00 00 00 49 83 c5 20 45 8b 3f 4c 89 e8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8 c1 91 c6 fc 49 8b 55 00 4c 89 f7 44 89 fe <67> 48 0f b9 3a 4d 89 e5 e9 3f ff ff ff 44 89 f1 80 e1 07 80 c1 03
RSP: 0018:ffffc90004adefc0 EFLAGS: 00010246
RAX: 1ffff1102d62aa9d RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffff888160642680 RSI: 0000000000000025 RDI: ffffffff8f961d70
RBP: ffffc90004adf0e8 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f1597f R12: ffff88810ffed328
R13: ffff88816b1554e8 R14: ffffffff8f961d70 R15: 0000000000000025
FS:  00007f8e321f46c0(0000) GS:ffff88818e91f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e3402a4c0 CR3: 000000016a81a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 drm_atomic_helper_commit_tail+0x2c3/0x4f0
 commit_tail+0x29a/0x3a0
 drm_atomic_helper_commit+0xa6e/0xb10
 drm_atomic_commit+0x246/0x2b0
 drm_client_modeset_commit_atomic+0x660/0x7e0
 drm_client_modeset_commit_locked+0xce/0x4d0
 drm_client_modeset_commit+0x4a/0x70
 __drm_fb_helper_restore_fbdev_mode_unlocked+0x9c/0x1c0
 drm_fb_helper_set_par+0xaf/0x100
 fb_set_var+0x847/0xfc0
 fbcon_resize+0xc07/0x1610
 vc_do_resize+0x775/0x1540
 vt_ioctl+0x1e06/0x20c0
 tty_ioctl+0x92e/0xde0
 __se_sys_ioctl+0xff/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e33fdcdd9
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:00007f8e321f4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8e34256180 RCX: 00007f8e33fdcdd9
RDX: 0000200000000040 RSI: 0000000000005609 RDI: 0000000000000006
RBP: 00007f8e34072d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8e34256218 R14: 00007f8e34256180 R15: 00007ffd902c8468
 </TASK>
