------------[ cut here ]------------ [CRTC:39:crtc-0] vblank wait timed out WARNING: drivers/gpu/drm/drm_atomic_helper.c:1921 at drm_atomic_helper_wait_for_vblanks.part.0+0x738/0x8a0 drivers/gpu/drm/drm_atomic_helper.c:1921, CPU#2: syz.7.2609/15359 Modules linked in: CPU: 2 UID: 0 PID: 15359 Comm: syz.7.2609 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:drm_atomic_helper_wait_for_vblanks.part.0+0x73e/0x8a0 drivers/gpu/drm/drm_atomic_helper.c:1921 Code: 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 0f b6 04 01 84 c0 74 08 3c 03 0f 8e 44 01 00 00 48 8d 3d 98 61 61 0b 8b b3 d0 00 00 00 <67> 48 0f b9 3a e9 e1 fc ff ff e8 c3 67 3d fc e9 7c fe ff ff e8 a9 RSP: 0018:ffffc900042277b8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888101a80040 RCX: 1ffff11020350022 RDX: ffff888027680d80 RSI: 0000000000000027 RDI: ffffffff912dca60 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88806280a900 FS: 00007f2da2c026c0(0000) GS:ffff8880d5fee000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc4e394f58 CR3: 000000002d676000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000001800 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: drm_atomic_helper_wait_for_vblanks drivers/gpu/drm/drm_atomic_helper.c:1895 [inline] drm_atomic_helper_commit_tail+0xff/0x130 drivers/gpu/drm/drm_atomic_helper.c:1997 commit_tail+0x338/0x430 drivers/gpu/drm/drm_atomic_helper.c:2074 drm_atomic_helper_commit+0x303/0x380 drivers/gpu/drm/drm_atomic_helper.c:2312 drm_atomic_commit+0x230/0x300 drivers/gpu/drm/drm_atomic.c:1789 drm_atomic_helper_dirtyfb+0x603/0x790 drivers/gpu/drm/drm_damage_helper.c:183 drm_mode_dirtyfb_ioctl+0x31d/0x460 drivers/gpu/drm/drm_framebuffer.c:765 drm_ioctl_kernel+0x1f3/0x3e0 drivers/gpu/drm/drm_ioctl.c:805 drm_ioctl+0x5e6/0xc60 drivers/gpu/drm/drm_ioctl.c:902 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2da1d9de59 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:00007f2da2c02028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2da2025fa0 RCX: 00007f2da1d9de59 RDX: 0000200000000080 RSI: 00000000c01864b1 RDI: 000000000000000c RBP: 00007f2da1e33e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2da2026038 R14: 00007f2da2025fa0 R15: 00007ffc4e395bb8 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 fc add %bh,%ah 4: ff lcall (bad) 5: df 48 89 fisttps -0x77(%rax) 8: f9 stc 9: 48 c1 e9 03 shr $0x3,%rcx d: 0f b6 04 01 movzbl (%rcx,%rax,1),%eax 11: 84 c0 test %al,%al 13: 74 08 je 0x1d 15: 3c 03 cmp $0x3,%al 17: 0f 8e 44 01 00 00 jle 0x161 1d: 48 8d 3d 98 61 61 0b lea 0xb616198(%rip),%rdi # 0xb6161bc 24: 8b b3 d0 00 00 00 mov 0xd0(%rbx),%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 e1 fc ff ff jmp 0xfffffd15 34: e8 c3 67 3d fc call 0xfc3d67fc 39: e9 7c fe ff ff jmp 0xfffffeba 3e: e8 .byte 0xe8 3f: a9 .byte 0xa9