Hi David,
Commit 93a7e7e837 ("net: Remove the now unused vrf_ptr") is causing a panic
whenever
I unplug a network device:
[ 5657.008034] kernel BUG at net/core/dev.c:5219!
[ 5657.008034] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
[ 5657.008034] Modules linked in:
[ 5657.008034] CPU: 4 PID: 25688 Comm: trinity-c134 Not tainted
4.3.0-rc3-next-20151001-sasha-00077-g0b55
fd2-dirty #2587
[ 5657.008034] task: ffff8800506e0000 ti: ffff880009340000 task.ti:
ffff880009340000
[ 5657.008034] RIP: __netdev_adjacent_dev_remove (net/core/dev.c:5219)
[ 5657.008034] RSP: 0018:ffff8800093474f0 EFLAGS: 00010282
[ 5657.008034] RAX: 0000000000000027 RBX: ffff8800a60330b8 RCX: 0000000000000000
[ 5657.008034] RDX: 0000000000000000 RSI: ffffffffaa54dc14 RDI: ffffed0001268e94
[ 5657.008034] RBP: ffff880009347520 R08: 0000000000000001 R09: 0000000000000000
[ 5657.008034] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8800a60330d0
[ 5657.008034] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8800a6033000
[ 5657.008034] FS: 00007ff2875b3700(0000) GS:ffff8801d0600000(0000)
knlGS:0000000000000000
[ 5657.008034] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 5657.008034] CR2: 0000000000639518 CR3: 00000000093da000 CR4: 00000000000006a0
[ 5657.008034] Stack:
[ 5657.008034] ffff8800506e0000 0000000000000000 ffff8800a6033000
0000000000000000
[ 5657.008034] ffff8800a6033000 ffff8800a6033000 ffff880009347540
ffffffffa9457c3e
[ 5657.008034] 0000000000000000 ffff8800a6033000 ffff880009347560
ffffffffa9457c77
[ 5657.008034] Call Trace:
[ 5657.008034] __netdev_adjacent_dev_unlink (net/core/dev.c:5286)
[ 5657.008034] __netdev_adjacent_dev_unlink_neighbour (net/core/dev.c:5316)
[ 5657.008034] netdev_upper_dev_unlink (net/core/dev.c:5496)
[ 5657.008034] do_vrf_del_slave (drivers/net/vrf.c:465)
[ 5657.008034] vrf_device_event (drivers/net/vrf.c:683)
[ 5657.008034] notifier_call_chain (kernel/notifier.c:93)
[ 5657.008034] raw_notifier_call_chain (kernel/notifier.c:402)
[ 5657.008034] call_netdevice_notifiers_info (net/core/dev.c:1615)
[ 5657.008034] rollback_registered_many (net/core/dev.c:6211)
[ 5657.008034] rollback_registered (net/core/dev.c:6251)
[ 5657.008034] unregister_netdevice_queue (include/linux/list.h:77
net/core/dev.c:6155 net/core/dev.c:7140)
[ 5657.008034] unregister_netdev (net/core/dev.c:7180)
[ 5657.008034] virtnet_remove (drivers/net/virtio_net.c:1941)
[ 5657.008034] virtio_dev_remove (drivers/virtio/virtio.c:265)
[ 5657.008034] __device_release_driver (drivers/base/dd.c:691)
[ 5657.008034] device_release_driver (include/linux/device.h:959
drivers/base/dd.c:722)
[ 5657.008034] bus_remove_device (drivers/base/bus.c:602)
[ 5657.008034] device_del (drivers/base/core.c:1267)
[ 5657.008034] device_unregister (drivers/base/core.c:1214
drivers/base/core.c:1300)
[ 5657.008034] unregister_virtio_device (drivers/virtio/virtio.c:338)
[ 5657.008034] virtio_pci_remove (drivers/virtio/virtio_pci_common.c:551)
[ 5657.008034] pci_device_remove (include/linux/compiler.h:206
./arch/x86/include/asm/atomic.h:27 ./arch/x86/include/asm/atomic.h:212
include/linux/atomic.h:349 include/linux/pm_runtime.h:71
drivers/pci/pci-driver.c:428)
[ 5657.008034] __device_release_driver (drivers/base/dd.c:691)
[ 5657.008034] device_release_driver (include/linux/device.h:959
drivers/base/dd.c:722)
[ 5657.059545] pci_stop_bus_device (drivers/pci/remove.c:26
drivers/pci/remove.c:79)
[ 5657.059545] pci_stop_and_remove_bus_device_locked (drivers/pci/remove.c:114
drivers/pci/remove.c:121)
[ 5657.059545] remove_store (drivers/pci/pci-sysfs.c:366)
[ 5657.059545] dev_attr_store (drivers/base/core.c:137)
[ 5657.059545] sysfs_kf_write (fs/sysfs/file.c:131)
[ 5657.059545] kernfs_fop_write (fs/kernfs/file.c:312)
[ 5657.059545] __vfs_write (fs/read_write.c:489)
[ 5657.059545] vfs_write (fs/read_write.c:539)
[ 5657.059545] SyS_pwrite64 (include/linux/file.h:38 fs/read_write.c:628
fs/read_write.c:614)
[ 5657.059545] tracesys_phase2 (arch/x86/entry/entry_64.S:270)
[ 5657.059545] Code: 48 8b 55 d0 4c 8b 63 18 49 8d 5c 24 e8 4c 39 e2 75 ac eb
05 48 85 db 75 14 4c 89 f2 4c 89 fe 48 c7 c7 20 79 2f ac e8 b2 ed 1d f8 <0f> 0b
4c 8d 63 0a 48 b8 00 00 00 00 00 fc ff df 4c 89 e1 48 c1
All code
========
0: 48 8b 55 d0 mov -0x30(%rbp),%rdx
4: 4c 8b 63 18 mov 0x18(%rbx),%r12
8: 49 8d 5c 24 e8 lea -0x18(%r12),%rbx
d: 4c 39 e2 cmp %r12,%rdx
10: 75 ac jne 0xffffffffffffffbe
12: eb 05 jmp 0x19
14: 48 85 db test %rbx,%rbx
17: 75 14 jne 0x2d
19: 4c 89 f2 mov %r14,%rdx
1c: 4c 89 fe mov %r15,%rsi
1f: 48 c7 c7 20 79 2f ac mov $0xffffffffac2f7920,%rdi
26: e8 b2 ed 1d f8 callq 0xfffffffff81deddd
2b:* 0f 0b ud2 <-- trapping instruction
2d: 4c 8d 63 0a lea 0xa(%rbx),%r12
31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
38: fc ff df
3b: 4c 89 e1 mov %r12,%rcx
3e: 48 rex.W
3f: c1 .byte 0xc1
...
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: 4c 8d 63 0a lea 0xa(%rbx),%r12
6: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
d: fc ff df
10: 4c 89 e1 mov %r12,%rcx
13: 48 rex.W
14: c1 .byte 0xc1
...
[ 5657.059545] RIP __netdev_adjacent_dev_remove (net/core/dev.c:5219)
[ 5657.059545] RSP <ffff8800093474f0>
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