Hi Wenli
I'm able to reproduce this issue on the latest kernel. Could you
please filing a Jira ticket for it?
thanks
cindy
On Tue, Jul 15, 2025 at 4:39 PM Cindy Lu <l...@redhat.com> wrote:
>
> On Tue, Jul 15, 2025 at 3:17 PM Wenli Quan <wq...@redhat.com> wrote:
> >
> > On Tue, Jul 15, 2025 at 9:35 AM Cindy Lu <l...@redhat.com> wrote:
> > >
> > > Hi Wenli,
> > >
> > > Could you please provide more details regarding the following:
> > >
> > > > \[ 84.703574\] vp-vdpa 0000:01:00.0: Failed to register to vdpa bus
> > > >
> > > > kernel answers: File exists
> > > >
> > > > # vdpa dev del vdpa0
> > >
> > > I suspect the device wasn't created successfully. Could it be that a
> > > vdpa0 already existed before you tried to create one?
> >
> > It existed vdpa0 before being removed. btw, to reproduce it, it's
> > needed to operate twice for creating the vdpa0 device, then to remove
> > it.
> >
> > # vdpa -jp dev config show vdpa0
> > {
> > Error: vdpa: device not found.
> > kernel answers: No such device
> > "config": {}
> > }
> >
> > After first creating the vdpa0.
> > # vdpa dev add name vdpa0 mgmtdev pci/0000:01:00.0 device_features
> > 0x1
> > # vdpa -jp dev config show vdpa0
> > {
> > "config": {
> > "vdpa0": {}
> > }
> > }
> > # vdpa dev add name vdpa0 mgmtdev pci/0000:01:00.0 device_features 0x1
> > [ 188.690040] vp-vdpa 0000:01:00.0: Failed to register to vdpa bus
> > kernel answers: File exists
> > # vdpa dev del vdpa0
> >
> > Then Call Trace happened.
> >
> > Best Regards, wenli
> >
> thanks Wenli. I will check this
> thanks
> cindy
>
> > > Thanks,
> > > Cindy
> > >
> > > On Tue, Jul 15, 2025 at 9:19 AM Jason Wang <jasow...@redhat.com> wrote:
> > > >
> > > > Adding Cindy for help here.
> > > >
> > > > On Mon, Jul 14, 2025 at 9:18 PM Wenli Quan <wq...@redhat.com> wrote:
> > > > >
> > > > > Hello all:
> > > > >
> > > > > I am encountering an issue when creating a vp_vdpa device with
> > > > > feature provisioning enabled.
> > > > >
> > > > > In the vm:
> > > > >
> > > > > # uname -r
> > > > > 6.16.0-rc2+
> > > > >
> > > > > # cd /sys/bus/pci/drivers/virtio-pci/
> > > > >
> > > > > # echo 0000:01:00.0 > unbind
> > > > >
> > > > > # modprobe vp_vdpa
> > > > >
> > > > > # cd ../vp-vdpa/
> > > > >
> > > > > # echo "1af4 1041" > new_id
> > > > >
> > > > > # vdpa dev add name vdpa0 mgmtdev pci/0000:01:00.0 device_features 0x1
> > > > >
> > > > > # vdpa dev add name vdpa0 mgmtdev pci/0000:01:00.0 device_features 0x1
> > > > >
> > > > > [ 84.703574] vp-vdpa 0000:01:00.0: Failed to register to vdpa bus
> > > > >
> > > > > kernel answers: File exists
> > > > >
> > > > > # vdpa dev del vdpa0
> > > > >
> > > > >
> > > > > [ 194.055148] BUG: kernel NULL pointer dereference, address:
> > > > > 00000000000000d0
> > > > >
> > > > > [ 194.055698] #PF: supervisor read access in kernel mode
> > > > >
> > > > > [ 194.056100] #PF: error_code(0x0000) - not-present page
> > > > >
> > > > > [ 194.056497] PGD 7c7e067 P4D 0
> > > > >
> > > > > [ 194.056739] Oops: Oops: 0000 [#1] SMP
> > > > >
> > > > > [ 194.057040] CPU: 0 UID: 0 PID: 13582 Comm: vdpa Not tainted
> > > > > 6.16.0-rc2+ #6 PREEMPT(voluntary)
> > > > >
> > > > > [ 194.057697] Hardware name: Red Hat KVM/RHEL, BIOS
> > > > > edk2-20241117-2.el9_6.1 11/17/2024
> > > > >
> > > > > [ 194.058299] RIP: 0010:device_del+0x40/0x480
> > > > >
> > > > > [ 194.058623] Code: 00 00 55 48 89 fd 53 48 83 ec 20 4c 8b 7f 40 4c
> > > > > 89 e7 65 48 8b 05 10 bf 73 01 48 89 44 24 18 31 c0 e8 b4 2f 63 00 48
> > > > > 8b 55 48 <0f> b6 82 d0 00 00 00 a8 01 75 09 83 c8 01 88 82 d0 00 00
> > > > > 00 4c 89
> > > > >
> > > > > [ 194.060031] RSP: 0018:ffa00000004dba90 EFLAGS: 00010246
> > > > >
> > > > > [ 194.060436] RAX: 0000000000000000 RBX: ff110000089f1720 RCX:
> > > > > ffffffffa05f2200
> > > > >
> > > > > [ 194.060976] RDX: 0000000000000000 RSI: ff11000018296800 RDI:
> > > > > ff11000018297080
> > > > >
> > > > > [ 194.061510] RBP: ff11000018297000 R08: ff1100000a3ea048 R09:
> > > > > ffa00000004dbc50
> > > > >
> > > > > [ 194.062051] R10: ff11000006abae00 R11: 0000000000000026 R12:
> > > > > ff11000018297080
> > > > >
> > > > > [ 194.062586] R13: ff1100000571c300 R14: ffa00000004dbc50 R15:
> > > > > 0000000000000000
> > > > >
> > > > > [ 194.063132] FS: 00007f03a6a95740(0000) GS:ff110000d8597000(0000)
> > > > > knlGS:0000000000000000
> > > > >
> > > > > [ 194.063748] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > >
> > > > > [ 194.064189] CR2: 00000000000000d0 CR3: 0000000007830004 CR4:
> > > > > 0000000000773ef0
> > > > >
> > > > > [ 194.064722] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> > > > > 0000000000000000
> > > > >
> > > > > [ 194.065258] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7:
> > > > > 0000000000000400
> > > > >
> > > > > [ 194.065813] PKRU: 55555554
> > > > >
> > > > > [ 194.066022] Call Trace:
> > > > >
> > > > > [ 194.066240] <TASK>
> > > > >
> > > > > [ 194.066418] device_unregister+0x12/0x30
> > > > >
> > > > > [ 194.066724] vp_vdpa_dev_del+0x16/0x20 [vp_vdpa]
> > > > >
> > > > > [ 194.067078] vdpa_nl_cmd_dev_del_set_doit+0x67/0xe0 [vdpa]
> > > > >
> > > > > [ 194.067497] genl_family_rcv_msg_doit+0xd2/0x120
> > > > >
> > > > > [ 194.067863] genl_rcv_msg+0x182/0x2b0
> > > > >
> > > > > [ 194.068160] ? vdpa_nl_cmd_dev_get_dumpit+0xa0/0xa0 [vdpa]
> > > > >
> > > > > [ 194.068594] ? genl_family_rcv_msg_dumpit+0xf0/0xf0
> > > > >
> > > > > [ 194.068971] netlink_rcv_skb+0x57/0x100
> > > > >
> > > > > [ 194.069270] genl_rcv+0x28/0x40
> > > > >
> > > > > [ 194.069515] netlink_unicast+0x278/0x3a0
> > > > >
> > > > > [ 194.069828] netlink_sendmsg+0x1e7/0x420
> > > > >
> > > > > [ 194.070134] __sock_sendmsg+0x38/0x60
> > > > >
> > > > > [ 194.070414] ? move_addr_to_kernel.part.0+0x1b/0x60
> > > > >
> > > > > [ 194.070794] __sys_sendto+0x115/0x170
> > > > >
> > > > > [ 194.071086] ? __sys_recvmsg+0x6a/0xc0
> > > > >
> > > > > [ 194.071378] __x64_sys_sendto+0x24/0x30
> > > > >
> > > > > [ 194.071674] do_syscall_64+0x59/0x1f0
> > > > >
> > > > > [ 194.071963] entry_SYSCALL_64_after_hwframe+0x4b/0x53
> > > > >
> > > > > [ 194.072347] RIP: 0033:0x7f03a6ba7dea
> > > > >
> > > > > [ 194.072625] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00
> > > > > f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00
> > > > > 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec
> > > > > 30 44 89
> > > > >
> > > > > [ 194.074021] RSP: 002b:00007ffceb0ebeb8 EFLAGS: 00000246 ORIG_RAX:
> > > > > 000000000000002c
> > > > >
> > > > > [ 194.074610] RAX: ffffffffffffffda RBX: 00005646e0680350 RCX:
> > > > > 00007f03a6ba7dea
> > > > >
> > > > > [ 194.075154] RDX: 0000000000000020 RSI: 00005646e0680350 RDI:
> > > > > 0000000000000003
> > > > >
> > > > > [ 194.075699] RBP: 00005646e06802a0 R08: 00007f03a6cae200 R09:
> > > > > 000000000000000c
> > > > >
> > > > > [ 194.076455] R10: 0000000000000000 R11: 0000000000000246 R12:
> > > > > 0000000000000000
> > > > >
> > > > > [ 194.077197] R13: 0000000000000000 R14: 00007ffceb0ec75d R15:
> > > > > 0000000000000064
> > > > >
> > > > > [ 194.077944] </TASK>
> > > > >
> > > > > [ 194.078321] Modules linked in: vp_vdpa vdpa kvm_intel kvm
> > > > > irqbypass fuse configfs xfs virtio_net net_failover failover
> > > > > virtio_pci virtio_pci_legacy_dev virtio_pci_modern_dev be2iscsi
> > > > > cxgb3i cxgb3 mdio libcxgbi libcxgb iscsi_tcp libiscsi_tcp libiscsi
> > > > > scsi_transport_iscsi autofs4
> > > > >
> > > > > [ 194.080556] CR2: 00000000000000d0
> > > > >
> > > > > [ 194.081040] ---[ end trace 0000000000000000 ]---
> > > > >
> > > > > [ 194.660537] RIP: 0010:device_del+0x40/0x480
> > > > >
> > > > > [ 194.662514] Code: 00 00 55 48 89 fd 53 48 83 ec 20 4c 8b 7f 40 4c
> > > > > 89 e7 65 48 8b 05 10 bf 73 01 48 89 44 24 18 31 c0 e8 b4 2f 63 00 48
> > > > > 8b 55 48 <0f> b6 82 d0 00 00 00 a8 01 75 09 83 c8 01 88 82 d0 00 00
> > > > > 00 4c 89
> > > > >
> > > > > [ 194.664367] RSP: 0018:ffa00000004dba90 EFLAGS: 00010246
> > > > >
> > > > > [ 194.664996] RAX: 0000000000000000 RBX: ff110000089f1720 RCX:
> > > > > ffffffffa05f2200
> > > > >
> > > > > [ 194.665760] RDX: 0000000000000000 RSI: ff11000018296800 RDI:
> > > > > ff11000018297080
> > > > >
> > > > > [ 194.666527] RBP: ff11000018297000 R08: ff1100000a3ea048 R09:
> > > > > ffa00000004dbc50
> > > > >
> > > > > [ 194.667300] R10: ff11000006abae00 R11: 0000000000000026 R12:
> > > > > ff11000018297080
> > > > >
> > > > > [ 194.668066] R13: ff1100000571c300 R14: ffa00000004dbc50 R15:
> > > > > 0000000000000000
> > > > >
> > > > > [ 194.668823] FS: 00007f03a6a95740(0000) GS:ff110000d8597000(0000)
> > > > > knlGS:0000000000000000
> > > > >
> > > > > [ 194.669653] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > >
> > > > > [ 194.670322] CR2: 00000000000000d0 CR3: 0000000007830004 CR4:
> > > > > 0000000000773ef0
> > > > >
> > > > > [ 194.671083] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> > > > > 0000000000000000
> > > > >
> > > > > [ 194.671845] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7:
> > > > > 0000000000000400
> > > > >
> > > > > [ 194.672607] PKRU: 55555554
> > > > >
> > > > > [ 194.673042] note: vdpa[13582] exited with irqs disabled
> > > > >
> > > > > Killed
> > > > >
> > > > >
> > > > > Best Regards,
> > > > >
> > > > >
> > > > > wenli
> > > >
> > > > Thanks
> > > >
> > >
> >
