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Subjectvma corruption in today's -git
Running a kernel that I built from a git pull from this afternoon,
I ran a barrage of stress tests, including some of the new syscall fuzzing
work that I've been working on. Everything seemed just fine, except that
after I had stopped running everything, loadavg was still at 6, with
top showing kworker processes running at high % of cpu.

I ran perf top, and got this ..

BUG: unable to handle kernel paging request at fffffffffffffff3
IP: [<ffffffff8118d3e9>] vma_stop.clone.3+0x18/0x33
PGD 1a05067 PUD 1a06067 PMD 0
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0/energy_full
CPU 0
Modules linked in: ipx p8022 psnap llc p8023 sctp libcrc32c tun vfat fat usb_storage uas nfs fscache fuse nfsd lockd nfs_acl auth_rpcgss sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipv6 uinput arc4 iwlagn btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_idt mac80211 snd_hda_intel snd_usb_audio snd_hda_codec dell_wmi snd_seq sparse_keymap uvcvideo snd_pcm dell_laptop snd_hwdep dcdbas snd_usbmidi_lib microcode videodev zaurus cfg80211 snd_rawmidi snd_seq_device cdc_ether v4l2_compat_ioctl32 usbnet snd_timer iTCO_wdt pcspkr joydev cdc_acm i2c_i801 cdc_wdm tg3 snd mii iTCO_vendor_support rfkill soundcore snd_page_alloc wmi i915 drm_kms_helper drm i2c_algo_bit i2c_core video [last unloaded: scsi_wait_scan]
Pid: 324, comm: perf Tainted: G W 2.6.38+ #5 Dell Inc. Adamo 13 /0N70T0
RIP: 0010:[<ffffffff8118d3e9>] [<ffffffff8118d3e9>] vma_stop.clone.3+0x18/0x33
RSP: 0018:ffff880114de1e48 EFLAGS: 00010286
RAX: 00000000fffffff3 RBX: ffff880007f44bc8 RCX: ffff8800b7216806
RDX: ffffffff81618f50 RSI: fffffffffffffff3 RDI: ffff880007f44bd8
RBP: ffff880114de1e58 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff81a26870 R11: 0000000000000246 R12: ffff88000fe3d880
R13: ffff8800b72168f8 R14: fffffffffffffff3 R15: 0000000000000000
FS: 00007f59e738c720(0000) GS:ffff88013fa00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff3 CR3: 0000000136566000 CR4: 00000000000406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process perf (pid: 324, threadinfo ffff880114de0000, task ffff8800b43c23b0)
Stack:
0000000000000000 ffff880007f44bc8 ffff880114de1e78 ffffffff8118d46a
0000000000000000 0000000000000400 ffff880114de1ef8 ffffffff81159a99
0000000000000004 ffff8801fffffff3 0000000000000004 ffff8800b7216930
Call Trace:
[<ffffffff8118d46a>] m_stop+0x1e/0x30
[<ffffffff81159a99>] seq_read+0x240/0x36e
[<ffffffff8113dc28>] vfs_read+0xac/0xff
[<ffffffff8113f0f8>] ? fget_light+0x3a/0xa1
[<ffffffff8113dcc8>] sys_read+0x4d/0x74
[<ffffffff814d6b42>] system_call_fastpath+0x16/0x1b
Code: 8b 54 24 08 48 89 53 30 41 5d 5b 41 5c 31 c0 41 5d c9 c3 55 48 89 e5 53 48 83 ec 08 0f 1f 44 00 00 48 85 f6 74 1c 48 3b 37 74 17
8b 1e 48 8d bb a8 00 00 00 e8 d9 e6 ee ff 48 89 df e8 9a ab
RIP [<ffffffff8118d3e9>] vma_stop.clone.3+0x18/0x33
RSP <ffff880114de1e48>
CR2: fffffffffffffff3
---[ end trace ea1a722d5e92836a ]---

it smells like something got corrupted, but I'm not sure where
to start. I've got a bunch of debug options turned on, but nothing
else triggered, so I've got nothing other than this oops to go on.

Any thoughts ?

Dave



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