Hello, I am getting a NULL dereference on v4.1.x while enabling VF on a ixgbe ( Intel Corporation 82599ES 10-Gigabit) card during boot. It seems to be related to a race since I don't have the issue if I test it a few seconds after boot. I had the same issue while testing on v4.5.x What can I do to help debug the issue?
ip link set dev eth0 up echo 32 > /sys/class/net/eth0/device/sriov_numvfs part of the dmesg: ixgbe 0000:82:00.1: removed PHC on eth1 ixgbe 0000:82:00.1: Multiqueue Enabled: Rx Queue count = 2, Tx Queue count = 2 ixgbe 0000:82:00.1: registered PHC device on eth1 ixgbe 0000:82:00.1 eth1: detected SFP+: 4 ixgbe 0000:82:00.1 eth1: NIC Link is Up 10 Gbps, Flow Control: RX/TX ixgbevf: Could not enable Tx Queue 0 ixgbevf: Could not enable Tx Queue 1 8021q: adding VLAN 0 to HW filter on device eth2 ixgbe 0000:82:00.0 eth0: VF Reset msg received from vf 0 ixgbe 0000:82:00.0: VF 0 has no MAC address assigned, you may have to assign one manually BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 ixgbevf: Could not enable Tx Queue 0 ixgbevf: Could not enable Tx Queue 1 IP: [<ffffffff813d3873>] ixgbevf_alloc_rx_buffers+0x53/0x170 PGD 0 Oops: 0000 [#1] PREEMPT SMP Modules linked in: CPU: 8 PID: 1034 Comm: kworker/8:1 Tainted: G W 4.1.23 #1 Workqueue: events ixgbevf_service_task task: ffff882021558000 ti: ffff882021554000 task.ti: ffff882021554000 RIP: 0010:[<ffffffff813d3873>] [<ffffffff813d3873>] ixgbevf_alloc_rx_buffers+0x53/0x170 RSP: 0018:ffff882021557c58 EFLAGS: 00010246 RAX: 0000000000000200 RBX: ffff88201ccc09c0 RCX: 0000000000000000 RDX: ffffc9000e860000 RSI: 00000000000001ff RDI: ffff88201ccc09c0 RBP: ffff882021557c98 R08: 0000000000000001 R09: 0000000000000001 R10: ffff882021558000 R11: 000000000000017e R12: 0000000000000000 R13: 00000000fffffe00 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88207fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000001a08000 CR4: 00000000001406e0 Stack: ffff88201d630940 01ff00000000000a ffff882021557c78 ffff88201d630c28 ffff88201d630940 0000000000000009 ffff88201ccc09c0 0000000000000000 ffff882021557d18 ffffffff813d54b8 0000102800001028 0000000000000000 Call Trace: [<ffffffff813d54b8>] ixgbevf_configure+0x50d/0x54e [<ffffffff813d6a11>] ? ixgbevf_down+0x2ba/0x2cb [<ffffffff813d6687>] ixgbevf_up+0x13/0x1f [<ffffffff813d6a85>] ixgbevf_reinit_locked+0x63/0x6c [<ffffffff813d76c9>] ixgbevf_service_task+0xe5/0x2dc [<ffffffff810743b7>] process_one_work+0x275/0x4f2 [<ffffffff81074ae1>] worker_thread+0x1f5/0x2a9 [<ffffffff810748ec>] ? rescuer_thread+0x289/0x289 [<ffffffff810748ec>] ? rescuer_thread+0x289/0x289 [<ffffffff81079775>] kthread+0xc5/0xcd [<ffffffff81577e9f>] ? _raw_spin_unlock_irq+0x2d/0x4c [<ffffffff810796b0>] ? __kthread_parkme+0x87/0x87 [<ffffffff81578a82>] ret_from_fork+0x42/0x70 [<ffffffff810796b0>] ? __kthread_parkme+0x87/0x87 Code: 0f 84 33 01 00 00 44 0f b7 67 2e 48 89 fb 0f b7 47 2c 4d 89 e5 4d 89 e6 4d 6b e4 18 49 c1 e6 04 4c 03 77 18 41 29 c5 4c 03 67 38 <49> 83 7c 24 08 00 0f 85 9e 00 00 00 65 8b 05 2a dc c3 7e 48 98 RIP [<ffffffff813d3873>] ixgbevf_alloc_rx_buffers+0x53/0x170 RSP <ffff882021557c58> CR2: 0000000000000008 ---[ end trace 6e4d9e7fa97d4fca ]--- BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:21 in_atomic(): 0, irqs_disabled(): 1, pid: 1034, name: kworker/8:1 INFO: lockdep is turned off. irq event stamp: 43238 hardirqs last enabled at (43237): [<ffffffff81577efd>] _raw_spin_unlock_irqrestore+0x3f/0x60 hardirqs last disabled at (43238): [ 41.225859] 8021q: adding VLAN 0 to HW filter on device eth3 [<ffffffff8157a4b3>] error_sti+0x5/0x6 Thanks, -- William
