Hello, syzbot found the following issue on: HEAD commit: fe91c4725aee Merge tag 'scsi-misc' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=173a8aeab00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7d0e8aeec50207a6 dashboard link: https://syzkaller.appspot.com/bug?extid=4af2eec0d32a135ba67e compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4af2eec0d32a135ba67e@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 PID: 27453 Comm: syz-executor.3 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 8c 50 RSP: 0018:ffffc90024f0f708 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888078deb000 RCX: ffffc9002783b000 RDX: 0000000000000003 RSI: ffffffff8462b2d5 RDI: 0000000000000018 RBP: ffff88801f33ba80 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81cd631d R11: 0000000000000000 R12: ffffc90024f0f898 R13: 0000000000000000 R14: 0000000000000010 R15: 0000000000000004 FS: 00007f5ce5906700(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5ce84009e8 CR3: 000000006c1f7000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> vfs_poll include/linux/poll.h:90 [inline] do_select+0x8cb/0x16a0 fs/select.c:534 core_sys_select+0x3c2/0x9c0 fs/select.c:677 do_pselect.constprop.0+0x17b/0x1c0 fs/select.c:759 __do_sys_pselect6 fs/select.c:800 [inline] __se_sys_pselect6 fs/select.c:791 [inline] __x64_sys_pselect6+0x1c5/0x2b0 fs/select.c:791 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: 0033:0x7f5ce8390ae9 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:00007f5ce5906188 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: ffffffffffffffda RBX: 00007f5ce84a3f60 RCX: 00007f5ce8390ae9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000040 RBP: 00007f5ce83eaf25 R08: 0000000020000380 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd10da36cf R14: 00007f5ce5906300 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 1158ebbbb6efaa79 ]--- 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 8c 50 RSP: 0018:ffffc90024f0f708 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888078deb000 RCX: ffffc9002783b000 RDX: 0000000000000003 RSI: ffffffff8462b2d5 RDI: 0000000000000018 RBP: ffff88801f33ba80 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81cd631d R11: 0000000000000000 R12: ffffc90024f0f898 R13: 0000000000000000 R14: 0000000000000010 R15: 0000000000000004 FS: 00007f5ce5906700(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5ce84009e8 CR3: 000000006c1f7000 CR4: 0000000000150ef0 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: 8c .byte 0x8c 3f: 50 push %rax --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
