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Subjectgeneral protection fault on 3.19.0-rc1 / amd64 SMP anon_vma_interval_tree_remove (?)

I just hit this rebooting an x86-64 3.19.0-rc1 kernel on a 4 core AMD
cpu when the machine was starting check the filesystems:

[ 22.427652] general protection fault: 0000 [#1] PREEMPT SMP
[ 22.431822] Modules linked in: max6650 fuse parport_pc ppdev lp
parport snd_hda_codec_hdmi ir_mce_kbd_decoder ir_lirc_codec
ir_sharp_decoder ir_jvc_decoder ir_xmp_decoder ir_sanyo_decoder lirc_dev
ir_sony_decoder ir_rc5_decoder ir_rc6_decoder ir_nec_decoder
snd_hda_codec_realtek fc0012 snd_hda_codec_generic dvb_usb_rtl28xxu
rtl2830 rtl2832 snd_hda_intel snd_hda_controller i2c_mux dvb_usb_v2
kvm_amd dvb_core kvm snd_hda_codec rc_core snd_hwdep snd_pcm_oss
snd_mixer_oss snd_pcm snd_timer radeon snd soundcore ttm drm_kms_helper
drm i2c_algo_bit psmouse pcspkr serio_raw evdev k10temp acpi_cpufreq
sp5100_tco processor asus_atk0110 i2c_piix4 button thermal_sys wmi ext4
mbcache crc16 jbd2 sg sr_mod cdrom sd_mod ata_generic uas usb_storage
ohci_pci ahci pata_atiixp libahci libata r8169 mii ehci_pci scsi_mod
[ 22.447067] ohci_hcd ehci_hcd usbcore usb_common
[ 22.452140] CPU: 2 PID: 449 Comm: udevd Not tainted 3.19.0-rc1 #1422
[ 22.457351] Hardware name: System manufacturer System Product
Name/M3A78 PRO, BIOS 1701 01/27/2011
[ 22.462707] task: ffff8800cba60450 ti: ffff88022e21c000 task.ti:
ffff88022e21c000
[ 22.468111] RIP: 0010:[<ffffffff8115ec00>] [<ffffffff8115ec00>]
anon_vma_interval_tree_remove+0x1f0/0x250
[ 22.473677] RSP: 0018:ffff88022e21fd28 EFLAGS: 00010246
[ 22.479257] RAX: ffff88022e1f87a1 RBX: ffff88022e258540 RCX:
0000000000000000
[ 22.484914] RDX: 09be26aa0000000b RSI: ffff8800ca746f88 RDI:
ffff88022e258540
[ 22.490600] RBP: ffff88022e21fd38 R08: 0000000000000001 R09:
0000000000000000
[ 22.496345] R10: 0000000000000000 R11: ffff88022e258560 R12:
ffff8800ca746ef8
[ 22.502153] R13: ffff88022e1c88d0 R14: ffff8800ca746ef8 R15:
ffff88022e1c88c0
[ 22.507950] FS: 00007f465b1ed880(0000) GS:ffff88022d480000(0000)
knlGS:0000000000000000
[ 22.513766] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 22.519600] CR2: 00007f465a5e1148 CR3: 0000000223bf6000 CR4:
00000000000007e0
[ 22.525500] Stack:
[ 22.531390] ffff88022e258540 ffff8800ca746ef8 ffff88022e21fd88
ffffffff81172f99
[ 22.537441] ffff88022e21fd58 ffff88022e1c8858 ffff88022e21fd88
ffff88022e1c8908
[ 22.543499] 000000301b600000 0000000000000000 ffff88022e21fdf8
ffff88022e1c8858
[ 22.549577] Call Trace:
[ 22.555627] [<ffffffff81172f99>] unlink_anon_vmas+0x69/0x1c0
[ 22.561787] [<ffffffff81164750>] free_pgtables+0xa0/0x120
[ 22.567922] [<ffffffff8116f18e>] exit_mmap+0xae/0x170
[ 22.574018] [<ffffffff8104f70d>] mmput+0x4d/0x110
[ 22.580077] [<ffffffff8105530f>] do_exit+0x2af/0xb30
[ 22.586123] [<ffffffff8153f820>] ? retint_swapgs+0x13/0x1b
[ 22.592127] [<ffffffff81055c1f>] do_group_exit+0x4f/0xe0
[ 22.598082] [<ffffffff81055cbf>] SyS_exit_group+0xf/0x10
[ 22.603928] [<ffffffff8153eb69>] system_call_fastpath+0x12/0x17
[ 22.609688] Code: 85 c0 4c 89 c0 74 5c 4d 39 58 10 74 4a 49 89 48 08
48 85 c9 74 52 48 89 11 45 31 c0 48 85 c0 0f 85 43 ff ff ff eb 9e 48 8b
47 20 <48> 89 02 48 83 e0 fc 74 4c 4c 3b 58 10 74 23 48 89 50 08 eb d9
[ 22.616345] RIP [<ffffffff8115ec00>]
anon_vma_interval_tree_remove+0x1f0/0x250
[ 22.622537] RSP <ffff88022e21fd28>
[ 22.628794] ---[ end trace d911d3ebea9cb352 ]---
[ 22.635030] Fixing recursive fault but reboot is needed!

I haven't hit one of these errors for a while and this has only
happened the once with this kernel. If anyone wants more details I'm
happy to supply them.
Arthur.





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