rb_erase oops.

[Dave Jones]

Kernel based on v3.15-7257-g963649d735c8

	Dave

Oops: 0000 [#1] PREEMPT SMP 
Modules linked in: dlci 8021q garp snd_seq_dummy bnep llc2 af_key bridge stp fuse tun scsi_transport_iscsi ipt_ULOG nfnetlink rfcomm can_raw hidp can_bcm nfc caif_socket caif af_802154 ieee802154 phonet af_rxrpc can pppoe pppox ppp_generic slhc irda crc_ccitt rds rose x25 atm netrom appletalk ipx p8023 psnap p8022 llc ax25 coretemp cfg80211 hwmon x86_pkg_temp_thermal kvm_intel kvm snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic btusb bluetooth snd_hda_intel xfs snd_hda_controller snd_hda_codec snd_hwdep snd_seq e1000e snd_seq_device crct10dif_pclmul crc32c_intel ghash_clmulni_intel snd_pcm snd_timer snd 6lowpan_iphc usb_debug rfkill libcrc32c ptp pps_core microcode shpchp pcspkr serio_raw soundcore
CPU: 3 PID: 2049 Comm: kworker/3:1 Not tainted 3.15.0+ #231
Workqueue: events free_work
task: ffff880100944260 ti: ffff88009ed9c000 task.ti: ffff88009ed9c000
RIP: 0010:[<ffffffff8a326619>]  [<ffffffff8a326619>] rb_erase+0xb9/0x380
RSP: 0000:ffff88009ed9fcc0  EFLAGS: 00010202
RAX: ffff8802396b0018 RBX: ffff88024176b008 RCX: 0000000000000000
RDX: ffffc90010fe1bf0 RSI: ffffffff8afb3178 RDI: 0000000000000001
RBP: ffff88009ed9fcc0 R08: ffff88023b122e58 R09: ffff88024176ae58
R10: 0000000000000000 R11: ffff880245801dc0 R12: ffff88024176b020
R13: ffff88009ed9fd80 R14: ffff88009ed9fd88 R15: ffff88024e397100
FS:  0000000000000000(0000) GS:ffff88024e380000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000001 CR3: 000000000ac10000 CR4: 00000000001407e0
DR0: 00000000024cc000 DR1: 00000000024c2000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff88009ed9fce0 ffffffff8a195674 ffff88024176ae40 ffffffff8ac64260
 ffff88009ed9fd70 ffffffff8a19631d ffff88009ed9fd88 ffff88009ed9fd80
 ffff88009ed9fd10 ffff880244b93750 0000000000000000 ffff880244b93750
Call Trace:
 [<ffffffff8a195674>] __free_vmap_area+0x54/0xf0
 [<ffffffff8a19631d>] __purge_vmap_area_lazy+0x15d/0x4a0
 [<ffffffff8a1966e1>] free_vmap_area_noflush+0x81/0x90
 [<ffffffff8a197dae>] remove_vm_area+0x5e/0x70
 [<ffffffff8a197dee>] __vunmap+0x2e/0x100
 [<ffffffff8a197eed>] free_work+0x2d/0x40
 [<ffffffff8a08df11>] process_one_work+0x171/0x4d0
 [<ffffffff8a08eeac>] worker_thread+0x12c/0x3d0
 [<ffffffff8a0bc4b2>] ? complete+0x42/0x50
 [<ffffffff8a08ed80>] ? manage_workers.isra.25+0x2d0/0x2d0
 [<ffffffff8a095b3f>] kthread+0xff/0x120
 [<ffffffff8a095a40>] ? kthread_create_on_node+0x1c0/0x1c0
 [<ffffffff8a741eec>] ret_from_fork+0x7c/0xb0
 [<ffffffff8a095a40>] ? kthread_create_on_node+0x1c0/0x1c0
Code: 85 d2 74 0e 48 83 c8 01 48 89 0a 49 89 02 5d c3 66 90 48 8b 3a 48 89 0a 83 e7 01 74 f1 31 c9 eb 40 90 48 8b 7a 08 48 85 ff 74 09 <f6> 07 01 0f 84 a3 01 00 00 48 8b 4a 10 48 85 c9 74 09 f6 01 01 
RIP  [<ffffffff8a326619>] rb_erase+0xb9/0x380
 RSP <ffff88009ed9fcc0>

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