Hello, syzbot found the following issue on: HEAD commit: 089866061428 Merge tag 'libnvdimm-fixes-5.19-rc5' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15ce44ec080000 kernel config: https://syzkaller.appspot.com/x/.config?x=3a010dbf6a7af480 dashboard link: https://syzkaller.appspot.com/bug?extid=2f09dba03ce3f3b0a2cf compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13650150080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16687b6c080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2f09dba03ce3f3b0a2cf@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 3668 Comm: syz-executor918 Not tainted 5.19.0-rc4-syzkaller-00187-g089866061428 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:virtio_gpu_object_shmem_init drivers/gpu/drm/virtio/virtgpu_object.c:183 [inline] RIP: 0010:virtio_gpu_object_create+0x29b/0xd90 drivers/gpu/drm/virtio/virtgpu_object.c:249 Code: 89 de e8 98 3c ed fc 48 85 db 0f 85 9f 03 00 00 e8 2a 40 ed fc 49 8d 7f 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 82 RSP: 0018:ffffc90002e5fad0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff848c5756 RDI: 0000000000000000 RBP: ffff88802286b800 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90002e5fbd0 R13: ffff88801c4c0010 R14: ffff88801c4c0000 R15: fffffffffffffff4 FS: 0000555556654300(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa12e2a42a4 CR3: 0000000015c4e000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> virtio_gpu_gem_create drivers/gpu/drm/virtio/virtgpu_gem.c:42 [inline] virtio_gpu_mode_dumb_create+0x319/0x5c0 drivers/gpu/drm/virtio/virtgpu_gem.c:90 drm_mode_create_dumb+0x26c/0x2f0 drivers/gpu/drm/drm_dumb_buffers.c:96 drm_ioctl_kernel+0x27d/0x4e0 drivers/gpu/drm/drm_ioctl.c:782 drm_ioctl+0x51e/0x9d0 drivers/gpu/drm/drm_ioctl.c:885 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 RIP: 0033:0x7fa12e24c699 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff25d83428 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fa12e24c699 RDX: 0000000020000000 RSI: 00000000c02064b2 RDI: 0000000000000003 RBP: 00007fff25d83440 R08: 0000000000000002 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:virtio_gpu_object_shmem_init drivers/gpu/drm/virtio/virtgpu_object.c:183 [inline] RIP: 0010:virtio_gpu_object_create+0x29b/0xd90 drivers/gpu/drm/virtio/virtgpu_object.c:249 Code: 89 de e8 98 3c ed fc 48 85 db 0f 85 9f 03 00 00 e8 2a 40 ed fc 49 8d 7f 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 82 RSP: 0018:ffffc90002e5fad0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff848c5756 RDI: 0000000000000000 RBP: ffff88802286b800 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90002e5fbd0 R13: ffff88801c4c0010 R14: ffff88801c4c0000 R15: fffffffffffffff4 FS: 0000555556654300(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa12e2a42a4 CR3: 0000000015c4e000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 de mov %ebx,%esi 2: e8 98 3c ed fc callq 0xfced3c9f 7: 48 85 db test %rbx,%rbx a: 0f 85 9f 03 00 00 jne 0x3af 10: e8 2a 40 ed fc callq 0xfced403f 15: 49 8d 7f 0c lea 0xc(%r15),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 48 89 f8 mov %rdi,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 03 add $0x3,%eax 37: 38 d0 cmp %dl,%al 39: 7c 08 jl 0x43 3b: 84 d2 test %dl,%dl 3d: 0f .byte 0xf 3e: 85 .byte 0x85 3f: 82 .byte 0x82 --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
