general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 PID: 5343 Comm: syz-executor.1 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 4c 82 RSP: 0018:ffffc90005c7f920 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888024fac000 RCX: ffffc9000e8c5000 RDX: 0000000000000003 RSI: ffffffff84628285 RDI: 0000000000000018 RBP: ffff888024121c80 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81cd80ed R11: 0000000000000000 R12: ffffc90005c7fb68 R13: 0000000000000000 R14: ffff888024121c80 R15: dffffc0000000000 FS: 00007f5655e50700(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fd21000 CR3: 000000006de18000 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_poll fs/select.c:1076 [inline] __se_sys_poll fs/select.c:1064 [inline] __x64_sys_poll+0x18c/0x480 fs/select.c:1064 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: 0033:0x7f56588daae9 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:00007f5655e50188 EFLAGS: 00000246 ORIG_RAX: 0000000000000007 RAX: ffffffffffffffda RBX: 00007f56589edf60 RCX: 00007f56588daae9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020000000 RBP: 00007f5658934f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeafab0caf R14: 00007f5655e50300 R15: 0000000000022000 Modules linked in: ---[ end trace 11d196f1690212c5 ]--- 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 4c 82 RSP: 0018:ffffc90005c7f920 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888024fac000 RCX: ffffc9000e8c5000 RDX: 0000000000000003 RSI: ffffffff84628285 RDI: 0000000000000018 RBP: ffff888024121c80 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81cd80ed R11: 0000000000000000 R12: ffffc90005c7fb68 R13: 0000000000000000 R14: ffff888024121c80 R15: dffffc0000000000 FS: 00007f5655e50700(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fd21000 CR3: 000000006de18000 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: 4c rex.WR 3f: 82 .byte 0x82