Re: [Xen-devel] [BUG] kernel bug encountered at drivers/net/xen-netback/netback.c:430!

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

I finally have a reliable repro and and it's trivial...

Just try to copy a large file out of a Windows VM to an SMB share (using PV 
drivers in the VM). Dom0 goes bang pretty much immediately. I get another BUG 
too on another CPU...

[ 1062.422497] ------------[ cut here ]------------
[ 1062.422510] kernel BUG at drivers/net/xen-netback/netback.c:1225!
[ 1062.422518] invalid opcode: 0000 [#2] SMP
[ 1062.422522] Modules linked in: xt_physdev br_netfilter iptable_filter tun 
nfsv3 nfs_acl rpcsec_gss_krbl
[ 1062.422618]  ahci libahci ehci_pci libata ehci_hcd tg3 megaraid_sas ptp 
usbcore pps_core scsi_mod libpy
[ 1062.422636] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G      D W       
4.14.0-rc5+ #13
[ 1062.422642] Hardware name: Dell Inc. PowerEdge R730/0H21J3, BIOS 1.5.4 
10/002/2015
[ 1062.422649] task: ffffffff81c10480 task.stack: ffffffff81c00000
[ 1062.422659] RIP: 10000e030:xenvif_zerocopy_callback+0x7e/0xc0 [xen_netback]
[ 1062.422666] RSP: e02b:ffff88200e403d28 EFLAGS: 00010012
[ 1062.422672] RAX: 0000000000000240 RBX: ffffc90048a5a260 RCX: 0000000000000100
[ 1062.422678] RDX: 0000000000000540 RSI: ffffc90048a58420 RDI: 0000000000000039
[ 1062.422684] RBP: ffff88200e403d48 R08: 0000000000000000 R09: 0000000000000000
[ 1062.422691] R10: 0000000000000040 R11: ffff881feea1b268 R12: ffffc90048a63810
[ 1062.422697] R13: 0000000000000001 R14: ffffc90048a578e0 R15: ffff882002da4900
[ 1062.422714] FS:  0000000000000000(0000) GS:ffff88200e400000(0000) 
knlGS:0000000000000000
[ 1062.422721] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1062.422726] CR2: 00005615b0a0e000 CR3: 0000001fc96c4000 CR4: 0000000000042660
[ 1062.422734] Call Trace:
[ 1062.422738]  <IRQ>
[ 1062.422746]  skb_release_data+0xe4/0x110
[ 1062.422753]  skb_release_all+0x24/0x30
[ 1062.422758]  consume_skb+0x2c/0x90
[ 1062.422765]  __dev_kfree_skb_any+0x2f/0x40
[ 1062.422776]  tg3_poll_work+0x265/0xf20 [tg3]
[ 1062.422783]  ? xenvif_tx_action+0x758/0x8e0 [xen_netback]
[ 1062.422791]  ? __enqueue_entity+0x5c/0x60
[ 1062.422797]  ? enqueue_entity+0x113/0x7b0
[ 1062.422806]  ? tg3_msi_1shot+0x52/0x60 [tg3]
[ 1062.422814]  tg3_poll+0x7e/0x420 [tg3]
[ 1062.422821]  net_rx_action+0x268/0x3e0
[ 1062.422829]  __do_softirq+0x104/0x28f
[ 1062.422837]  irq_exit+0xb6/0xc0
[ 1062.422843]  xen_evtchn_do_upcall+0x30/0x40
[ 1062.422850]  xen_do_hypervisor_callback+0x29/0x40
[ 1062.422855]  </IRQ>

So, I can now start to investigate.

Cheers,

  Paul
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