general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 3 PID: 2154 Comm: syz-executor.2 Not tainted 5.15.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:virtio_gpu_poll+0x7c/0x440 drivers/gpu/drm/virtio/virtgpu_drv.c:169 Code: 48 c1 ea 03 80 3c 02 00 0f 85 2b 03 00 00 4c 8b ab b0 01 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7d 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 19 03 00 00 4d 8b 6d 18 31 ff 4c 89 ee e8 cc 58 RSP: 0018:ffffc900056c78e8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880006b7000 RCX: ffffc90024e89000 RDX: 0000000000000003 RSI: ffffffff8462aa85 RDI: 0000000000000018 RBP: ffff88801bb2e540 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81cd7eed R11: 0000000000000000 R12: ffffc900056c7b30 R13: 0000000000000000 R14: ffff88801bb2e540 R15: dffffc0000000000 FS: 00007f907cb52700(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30c22000 CR3: 000000004c375000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vfs_poll include/linux/poll.h:90 [inline] do_pollfd fs/select.c:869 [inline] do_poll fs/select.c:917 [inline] do_sys_poll+0x60a/0xeb0 fs/select.c:1011 __do_sys_ppoll fs/select.c:1117 [inline] __se_sys_ppoll fs/select.c:1097 [inline] __x64_sys_ppoll+0x210/0x280 fs/select.c:1097 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f907f5dcae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f907cb52188 EFLAGS: 00000246 ORIG_RAX: 000000000000010f RAX: ffffffffffffffda RBX: 00007f907f6eff60 RCX: 00007f907f5dcae9 RDX: 00000000200001c0 RSI: 0000000000000007 RDI: 0000000020000180 RBP: 00007f907f636f25 R08: 0000000000000008 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd403608af R14: 00007f907cb52300 R15: 0000000000022000 Modules linked in: ---[ end trace 2fb46d0953ad6c10 ]--- RIP: 0010:virtio_gpu_poll+0x7c/0x440 drivers/gpu/drm/virtio/virtgpu_drv.c:169 Code: 48 c1 ea 03 80 3c 02 00 0f 85 2b 03 00 00 4c 8b ab b0 01 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7d 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 19 03 00 00 4d 8b 6d 18 31 ff 4c 89 ee e8 cc 58 RSP: 0018:ffffc900056c78e8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880006b7000 RCX: ffffc90024e89000 RDX: 0000000000000003 RSI: ffffffff8462aa85 RDI: 0000000000000018 RBP: ffff88801bb2e540 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81cd7eed R11: 0000000000000000 R12: ffffc900056c7b30 R13: 0000000000000000 R14: ffff88801bb2e540 R15: dffffc0000000000 FS: 00007f907cb52700(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30c22000 CR3: 000000004c375000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 2b 03 00 00 jne 0x339 e: 4c 8b ab b0 01 00 00 mov 0x1b0(%rbx),%r13 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 49 8d 7d 18 lea 0x18(%r13),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 19 03 00 00 jne 0x34d 34: 4d 8b 6d 18 mov 0x18(%r13),%r13 38: 31 ff xor %edi,%edi 3a: 4c 89 ee mov %r13,%rsi 3d: e8 .byte 0xe8 3e: cc int3 3f: 58 pop %rax