EPTP Violations while subverting KSM

[WedanEmmanuel]

Type of this issue (please specify)

• [x ] This is a bug in the upstream tree as-is unmodified.
• [ ] This is a support matter (i.e. your own modified tree)
• [ ] This is a technical question

System information

1. CPU: i7-4770
2. Kernel: Linux
3. Kernel version: 4.9

I have been trying to deploy KSM on my desktop using Linux kernel 4.9. I actually manage to load the module but while subverting it, i get a lot of troubles. -Sometimes it works (rarely) -When it crushes, I have an exit with (see exit.c):

• Exit reason 10,
• exit reason 48
• Triple fault

• kernel panic 128.232471] ksm: CPU 7: ksm_open: open() from a.out [ 128.237388] ksm: CPU 7: ksm_ioctl: ioctl from a.out: cmd(0x00004B02) [ 129.194462] ksm: CPU 0: ksm_init_cpu: swapper/0: Started: 1 [ 129.200279] ksm: CPU 0: vcpu_handle_exit: exit 48 prev=0 [ 129.414808] ksm: CPU 0: vcpu_handle_exit: exit 48 prev=48 [ 129.420264] ksm: CPU 0: vcpu_handle_exit: exit 48 prev=48 [ 130.012442] ksm: CPU 0: vcpu_handle_exit: exit 48 prev=48 [ 130.017919] ksm: CPU 0: vcpu_handle_exit: exit 48 prev=48 [ 130.023348] ksm: CPU 0: vcpu_handle_exit: exit 48 prev=48 [ 130.152079] ksm: CPU 1: ksm_init_cpu: swapper/1: Started: 1 [ 130.157905] ksm: CPU 1: vcpu_handle_exit: exit 48 prev=0 [ 130.163337] ksm: CPU 1: vcpu_handle_exit: exit 2 prev=48 [ 130.168676] Kernel panic - not syncing: bugcheck 00000000CCDDFF11 0000000033DDE83A 0x0000000000000002 0x0000000000000030 [ 130.168676] [ 130.181083] CPU: 1 PID: 316 Comm: systemd-journal Tainted: G OE 4.9.260+ #1 [ 130.189125] Hardware name: Dell Inc. Precision T1700/073MMW, BIOS A08 04/25/2014 [ 130.196558] ffff9b1457a0de68 ffffffff8949496b ffff9b1457a0c000 ffffffffc04c7020 [ 130.204032] ffff9b1457a0dee8 ffffffff89492e82 00007ffd00000028 ffff9b1457a0def8 [ 130.211507] ffff9b1457a0de90 ffffffff88ce2559 00000000ccddff11 0000000033dde83a [ 130.218980] Call Trace: [ 130.221457] ksm: CPU 0: vcpu_handle_exit: exit 10 prev=48 [ 131.165855] ksm: CPU 2: __ksm_init_cpu: swapper/2: Started: 1 [ 131.171642] ------------[ cut here ]------------ [ 131.176283] WARNING: CPU: 2 PID: 0 at arch/x86/kernel/smp.c:128 native_smp_send_reschedule+0x40/0x50 [ 131.185462] Modules linked in: ksmlinux(OE) nls_iso8859_1 nouveau snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp i915 snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec crct10dif_pclmul ghash_clmulni_intel snd_hda_core snd_hwdep aesni_intel snd_pcm aes_x86_64 lrw glue_helper ablk_helper mxm_wmi dcdbas cryptd wmi dell_smm_hwmon snd_seq_midi intel_cstate input_leds ttm snd_seq_midi_event snd_rawmidi snd_seq drm_kms_helper intel_rapl_perf serio_raw snd_seq_device snd_timer i2c_algo_bit snd mei_me fb_sys_fops mei syscopyarea sysfillrect sysimgblt soundcore video mac_hid sch_fq_codel[ 131.241858] Shutting down cpus with NMI [ 131.241869] Kernel Offset: 0x7c00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 131.241871] ksm: CPU 2: vcpu_handle_exit: exit 10 prev=0 [ 131.322523] ---[ end Kernel panic - not syncing: bugcheck 00000000CCDDFF11 0000000033DDE83A 0x0000000000000002 0x0000000000000030 [ 131.322523]

KSM path: https://github.com/asamy/ksm