[Bugme-new] [Bug 16671] New: DOS - bzr causes kernel wedge when used over nfs4

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Fri Aug 20 22:10:57 PDT 2010


https://bugzilla.kernel.org/show_bug.cgi?id=16671

           Summary: DOS - bzr causes kernel wedge when used over nfs4
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.35.x, 2.6.32 debian/ubuntu
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: NFS
        AssignedTo: trond.myklebust at fys.uio.no
        ReportedBy: matthewgrant5 at gmail.com
                CC: matthewgrant5 at gmail.com
        Regression: No


Created an attachment (id=27551)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=27551)
strace output of bzr

Hi!

This happens from inside KVM, and machine to machine.  It is a Denial of
service that can happen from user space, when bzr is working over an nfs4 file
system.

The kernel wedges, the bzr process is un-killable, and CPU goes to 100%...


MMmmmmmmm..... 

I have attached  an strace of the bzr process,

Here is the output of ver_linux:

$ sh scripts/ver_linux 
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.

Linux shalom 2.6.35-amd64-mag+ #1 SMP PREEMPT Sat Aug 21 15:33:32 NZST 2010
x86_64 GNU/Linux

Gnu C                  4.4.3
Gnu make               3.81
binutils               2.20.1
util-linux             2.17.2
mount                  support
module-init-tools      3.11.1
e2fsprogs              1.41.11
reiserfsprogs          3.6.21
xfsprogs               3.1.0
pcmciautils            014
Linux C Library        2.11.1
Dynamic linker (ldd)   2.11.1
Procps                 3.2.8
Net-tools              1.60
Kbd                    1.15
Sh-utils               7.4
wireless-tools         30
Modules Loaded         ppdev ip6table_filter ip6_tables iptable_filter
ip_tables x_tables kvm_amd kvm rpcsec_gss_krb5 cls_fw sch_cbq sch_gred sch_red
sch_sfq ipv6 autofs4 cx88_dvb cx88_vp3054_i2c mt352 s5h1409 dvb_pll
videobuf_dvb stb6100 or51132 cx24116 nxt200x isl6421 stb6000 fbcon zl10353
stv0900 cx24123 lgdt330x stv0299 stv0288 tileblit font bitblit fbcon_rotate
fbcon_cw fbcon_ud fbcon_ccw softcursor cx22702 snd_hda_codec_atihdmi wm8775
snd_seq_dummy rc_hauppauge_new nfsd snd_hda_codec_realtek exportfs nfs
snd_hda_intel lockd snd_hda_codec fscache nfs_acl snd_hwdep cx88_alsa tuner
auth_rpcgss snd_seq_oss snd_seq_midi tea5767 arc4 ecb tda8290 radeon
snd_pcm_oss snd_rawmidi sunrpc tda827x tuner_xc2028 xc5000 tda9887 tuner_simple
tuner_types ath9k mt20xx it87 ath9k_common snd_mixer_oss ath9k_hw hwmon_vid ttm
tea5761 snd_seq_midi_event snd_pcm ath snd_seq drm_kms_helper dummy drm
ir_sony_decoder cx8802 mac80211 ir_jvc_decoder cx8800 ir_rc6_decoder
ir_rc5_decoder cx88xx ir_nec_decoder saa7164 v4l2_common cfg80211 dvb_core
videodev tda18271 ir_common ir_core v4l1_compat s5h1411 tda10048
v4l2_compat_ioctl32 rtc_cmos lp rtc_core fb btcx_risc parport videobuf_dma_sg
tveeprom videobuf_core fbdev i2c_algo_bit i2c_piix4 rtc_lib snd_timer
cfbcopyarea rfkill snd_seq_device cfbimgblt snd soundcore wmi cfbfillrect
serio_raw joydev led_class snd_page_alloc hid_logitech usbhid ohci1394 ieee1394
sg e1000e sr_mod cdrom r8169 usb_storage

shalom: -grantma- [~/src/linux/linux-2.6.35]

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