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faux_driver vkms: [drm] vblank wait timed out on crtc 0
WARNING: drivers/gpu/drm/drm_vblank.c:1320 at drm_crtc_wait_one_vblank+0x357/0x500 drivers/gpu/drm/drm_vblank.c:1320, CPU#1: syz.3.3946/18910
Modules linked in:
CPU: 1 UID: 0 PID: 18910 Comm: syz.3.3946 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:drm_crtc_wait_one_vblank+0x4b6/0x500 drivers/gpu/drm/drm_vblank.c:1320
Code: e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ef e8 8a 94 d1 fc 4d 8b 7d 00 48 89 df 4c 89 e6 4c 89 fa 44 89 f1 <67> 48 0f b9 3a 48 8b 3c 24 44 89 f6 e8 e9 f4 ff ff b8 92 ff ff ff
RSP: 0018:ffffc9000dee7ae0 EFLAGS: 00010246
RAX: 1ffff11004bcf000 RBX: ffffffff8f96ab20 RCX: 0000000000000000
RDX: ffffffff8bc02b40 RSI: ffffffff8bc1f1e0 RDI: ffffffff8f96ab20
RBP: ffffc9000dee7bc8 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f1753f R12: ffffffff8bc1f1e0
R13: ffff888025e78000 R14: 0000000000000000 R15: ffffffff8bc02b40
FS:  00007febcf1556c0(0000) GS:ffff888126204000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d423ffc CR3: 0000000057548000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 drm_client_modeset_wait_for_vblank+0xc5/0xf0 drivers/gpu/drm/drm_client_modeset.c:1331
 drm_fb_helper_ioctl+0x6f/0xb0 drivers/gpu/drm/drm_fb_helper.c:920
 do_fb_ioctl+0x4cc/0x800 drivers/video/fbdev/core/fb_chrdev.c:155
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7febd0f1c819
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:00007febcf155028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007febd1196090 RCX: 00007febd0f1c819
RDX: 0000000000000000 RSI: 0000000040044620 RDI: 000000000000000b
RBP: 00007febd0fb2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007febd1196128 R14: 00007febd1196090 R15: 00007ffff9197a78
 </TASK>
----------------
Code disassembly (best guess):
   0:	e8 03 48 b9 00       	call   0xb94808
   5:	00 00                	add    %al,(%rax)
   7:	00 00                	add    %al,(%rax)
   9:	fc                   	cld
   a:	ff                   	lcall  (bad)
   b:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
  11:	08 4c 89 ef          	or     %cl,-0x11(%rcx,%rcx,4)
  15:	e8 8a 94 d1 fc       	call   0xfcd194a4
  1a:	4d 8b 7d 00          	mov    0x0(%r13),%r15
  1e:	48 89 df             	mov    %rbx,%rdi
  21:	4c 89 e6             	mov    %r12,%rsi
  24:	4c 89 fa             	mov    %r15,%rdx
  27:	44 89 f1             	mov    %r14d,%ecx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 8b 3c 24          	mov    (%rsp),%rdi
  33:	44 89 f6             	mov    %r14d,%esi
  36:	e8 e9 f4 ff ff       	call   0xfffff524
  3b:	b8 92 ff ff ff       	mov    $0xffffff92,%eax