On Tue, 28 Mar 2017, Kirill A. Shutemov wrote: > On Mon, Mar 27, 2017 at 04:16:00PM -0700, Doug Smythies wrote: > > Hi, > > > > Note: I am not sure I have the correct e-mail list for this. > > > > As of kernel 4.11-rc1 I have a very infrequent issue (only four times > > so far, once with -rc1 and three times with -rc2 (I never used -rc3, > > and am now running -rc4)) where ksmd becomes stuck, the load average > > goes way up and one CPU keeps hitting the NMI watchdog. I have not > > been able to figure out a way to recover and end up hitting the reset > > button on the computer. I am running 2 VM guests on this host server at > > the time. > > > > Note: these events have always been preceded by some other event, and > > so something else might be the root issue here. However, the preceding > > event also seems to be ksm related, not sure. > > > > Since the issue is so infrequent, and the event requires a hard reset, > > it would be almost impossible to bi-sect the kernel to isolate it. > > > > I am willing to do the work to isolate the issue, I just don't know > > what to do. While I never had this issue before kernel 4.11-rc1, I also > > do not run VM guests on this test computer all the time. > > > > Doug Smythies > > > > Log segment for one occurrence: > > > > Mar 27 15:17:07 s15 kernel: [92420.587173] BUG: unable to handle kernel paging request at ffff88e680000000 > > Mar 27 15:17:07 s15 kernel: [92420.587203] IP: page_vma_mapped_walk+0xe6/0x5b0 > > Mar 27 15:17:07 s15 kernel: [92420.587217] PGD ac80a067 > > Mar 27 15:17:07 s15 kernel: [92420.587217] PUD 41f5ff067 > > Mar 27 15:17:07 s15 kernel: [92420.587226] PMD 0 > > +Hugh. > > Thanks for report. > > It's likely I've screwed something up with my page_vma_mapped_walk() > transition. I don't see anything yet. And it's 2:30 AM. I'll look more > into it tomorrow. I've known for a while that there's something quite wrong with KSM in v4.11-rc, but haven't taken out the time to investigate yet (and was curious to see whether anyone else noticed - thank you Doug). I've rather supposed that it comes from your walk changes; but that's nothing more than a guess so far, and I haven't looked to see if what I hit is the same thing as Doug reports. I'll look back into it later today, or tomorrow. Hugh > > Meanwhile, could you check where the page_vma_mapped_walk+0xe6 is in your > build: > > ./scripts/faddr2line <your vmlinux> page_vma_mapped_walk+0xe6 > > > Mar 27 15:17:07 s15 kernel: [92420.587235] > > Mar 27 15:17:07 s15 kernel: [92420.587248] Oops: 0000 [#1] SMP > > Mar 27 15:17:07 s15 kernel: [92420.587259] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs > > cpuid vhost_net vhost tap xt_conntrack ipt_REJECT nf_reject_ipv4 ebtable_filter ebtables ip6_tables > > xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 > > nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp iptable_filter ip_tables > > x_tables snd_hda_codec_hdmi snd_hda_codec_realtek intel_rapl eeepc_wmi asus_wmi sparse_keymap > > snd_hda_codec_generic x86_pkg_temp_thermal snd_hda_intel snd_hda_codec intel_powerclamp bridge stp llc > > coretemp snd_hda_core snd_hwdep snd_pcm snd_timer snd soundcore intel_cstate ppdev mei_me mei shpchp > > input_leds intel_rapl_perf kvm_intel kvm irqbypass serio_raw parport_pc lpc_ich parport mac_hid > > tpm_infineon ib_iser rdma_cm iw_cm ib_cm ib_core configfs iscsi_tcp > > Mar 27 15:17:07 s15 kernel: [92420.587467] libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 > > raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 > > multipath linear i915 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i2c_algo_bit pcbc drm_kms_helper > > aesni_intel e1000e syscopyarea aes_x86_64 sysfillrect sysimgblt crypto_simd fb_sys_fops ahci glue_helper > > ptp r8169 cryptd libahci mii pps_core pata_acpi drm wmi fjes video > > Mar 27 15:17:07 s15 kernel: [92420.587587] CPU: 1 PID: 81 Comm: kswapd0 Not tainted 4.11.0-rc2-stock #218 > > Mar 27 15:17:07 s15 kernel: [92420.587607] Hardware name: System manufacturer System Product Name/P8Z68-M PRO, BIOS 4003 05/09/2013 > > Mar 27 15:17:07 s15 kernel: [92420.587632] task: ffff88ea4cab9680 task.stack: ffffb10c01e10000 > > Mar 27 15:17:07 s15 kernel: [92420.587650] RIP: 0010:page_vma_mapped_walk+0xe6/0x5b0 > > Mar 27 15:17:07 s15 kernel: [92420.587665] RSP: 0018:ffffb10c01e13a48 EFLAGS: 00010206 > > Mar 27 15:17:07 s15 kernel: [92420.587681] RAX: ffff88e67ffffff8 RBX: ffffb10c01e13a98 RCX: ffff88e680000000 > > Mar 27 15:17:07 s15 kernel: [92420.587701] RDX: 0017ffffc004005d RSI: 00003ffffffff000 RDI: ffffe4f74fc00080 > > Mar 27 15:17:07 s15 kernel: [92420.587721] RBP: ffffb10c01e13a78 R08: 0000000000000000 R09: 0000000000000000 > > Mar 27 15:17:07 s15 kernel: [92420.587749] R10: 0000000000000000 R11: 0000000000000289 R12: ffffe4f74fc00080 > > Mar 27 15:17:07 s15 kernel: [92420.587770] R13: ffffe4f74fc00080 R14: 00007f2e32400200 R15: ffff88e91e77c840 > > Mar 27 15:17:07 s15 kernel: [92420.587806] FS: 0000000000000000(0000) GS:ffff88ea5f240000(0000) knlGS:0000000000000000 > > Mar 27 15:17:07 s15 kernel: [92420.587829] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > Mar 27 15:17:07 s15 kernel: [92420.587845] CR2: ffff88e680000000 CR3: 00000000ac209000 CR4: 00000000000426e0 > > Mar 27 15:17:07 s15 kernel: [92420.587865] Call Trace: > > Mar 27 15:17:07 s15 kernel: [92420.587876] page_referenced_one+0x91/0x1a0 > > Mar 27 15:17:07 s15 kernel: [92420.587890] rmap_walk_ksm+0x100/0x190 > > Mar 27 15:17:07 s15 kernel: [92420.587902] rmap_walk+0x4f/0x60 > > Mar 27 15:17:07 s15 kernel: [92420.587913] page_referenced+0x149/0x170 > > Mar 27 15:17:07 s15 kernel: [92420.587926] ? invalid_page_referenced_vma+0x80/0x80 > > Mar 27 15:17:07 s15 kernel: [92420.587941] ? page_get_anon_vma+0x90/0x90 > > Mar 27 15:17:07 s15 kernel: [92420.587955] shrink_active_list+0x1c2/0x430 > > Mar 27 15:17:07 s15 kernel: [92420.587969] shrink_node_memcg+0x67a/0x7a0 > > Mar 27 15:17:07 s15 kernel: [92420.587983] shrink_node+0xe1/0x320 > > Mar 27 15:17:07 s15 kernel: [92420.587995] kswapd+0x34b/0x720 > > Mar 27 15:17:07 s15 kernel: [92420.588007] kthread+0x101/0x140 > > Mar 27 15:17:07 s15 kernel: [92420.588018] ? mem_cgroup_shrink_node+0x180/0x180 > > Mar 27 15:17:07 s15 kernel: [92420.588032] ? kthread_create_on_node+0x60/0x60 > > Mar 27 15:17:07 s15 kernel: [92420.588048] ret_from_fork+0x2c/0x40 > > Mar 27 15:17:07 s15 kernel: [92420.588059] Code: 08 00 00 20 00 49 39 c6 0f 83 7a ff ff ff 4c 8b 73 10 41 f7 c6 > > ff ff 1f 00 0f 84 87 02 00 00 48 8b 43 20 48 8d 48 08 48 89 4b 20 <48> f7 40 08 9f ff ff ff 0f 85 92 02 00 00 > > 49 81 c6 00 10 00 00 > > Mar 27 15:17:07 s15 kernel: [92420.588125] RIP: page_vma_mapped_walk+0xe6/0x5b0 RSP: ffffb10c01e13a48 > > Mar 27 15:17:07 s15 kernel: [92420.588144] CR2: ffff88e680000000 > > Mar 27 15:17:07 s15 kernel: [92420.595225] ---[ end trace 6e15d07cde4cc6de ]--- > > Mar 27 15:17:35 s15 kernel: [92448.572972] NMI watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [ksmd:64] > > Mar 27 15:17:35 s15 kernel: [92448.574115] Modules linked in: ... deleted... see above > > Mar 27 15:17:35 s15 kernel: [92448.583245] CPU: 2 PID: 64 Comm: ksmd Tainted: G D 4.11.0-rc2-stock #218 > > Mar 27 15:17:35 s15 kernel: [92448.584616] Hardware name: System manufacturer System Product Name/P8Z68-M PRO, BIOS 4003 05/09/2013 > > Mar 27 15:17:35 s15 kernel: [92448.586014] task: ffff88ea4c822d00 task.stack: ffffb10c01af8000 > > Mar 27 15:17:35 s15 kernel: [92448.587452] RIP: 0010:native_queued_spin_lock_slowpath+0x17c/0x1a0 > > Mar 27 15:17:35 s15 kernel: [92448.588853] RSP: 0018:ffffb10c01afbd70 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 > > Mar 27 15:17:35 s15 kernel: [92448.590300] RAX: 0000000000000101 RBX: ffff88e6757d7e10 RCX: 0000000000000001 > > Mar 27 15:17:35 s15 kernel: [92448.591766] RDX: 0000000000000101 RSI: 0000000000000001 RDI: ffffe4f740d5f5f0 > > Mar 27 15:17:35 s15 kernel: [92448.593215] RBP: ffffb10c01afbd70 R08: 0000000000000101 R09: ffff88e91e5c7b48 > > Mar 27 15:17:35 s15 kernel: [92448.594687] R10: 0000000000000000 R11: 00000000000003bd R12: ffffe4f740d5f5f0 > > Mar 27 15:17:35 s15 kernel: [92448.596111] R13: 0000000000000004 R14: ffff88e91e5c7b48 R15: ffffc00000000fff > > Mar 27 15:17:35 s15 kernel: [92448.597571] FS: 0000000000000000(0000) GS:ffff88ea5f280000(0000) knlGS:0000000000000000 > > Mar 27 15:17:35 s15 kernel: [92448.599026] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > Mar 27 15:17:35 s15 kernel: [92448.600449] CR2: 00007fb04f4a51e4 CR3: 00000000ac209000 CR4: 00000000000426e0 > > Mar 27 15:17:35 s15 kernel: [92448.601893] Call Trace: > > Mar 27 15:17:35 s15 kernel: [92448.603395] _raw_spin_lock+0x20/0x30 > > Mar 27 15:17:35 s15 kernel: [92448.604819] follow_page_pte+0x10c/0x650 > > Mar 27 15:17:35 s15 kernel: [92448.606300] follow_page_mask+0x1ee/0x5b0 > > Mar 27 15:17:35 s15 kernel: [92448.607693] ? find_vma+0x68/0x70 > > Mar 27 15:17:35 s15 kernel: [92448.609078] ksm_scan_thread+0xc08/0x12a0 > > Mar 27 15:17:35 s15 kernel: [92448.610476] ? wake_atomic_t_function+0x60/0x60 > > Mar 27 15:17:35 s15 kernel: [92448.611789] kthread+0x101/0x140 > > Mar 27 15:17:35 s15 kernel: [92448.613086] ? try_to_merge_with_ksm_page+0xa0/0xa0 > > Mar 27 15:17:35 s15 kernel: [92448.614337] ? kthread_create_on_node+0x60/0x60 > > Mar 27 15:17:35 s15 kernel: [92448.615535] ret_from_fork+0x2c/0x40 > > Mar 27 15:17:35 s15 kernel: [92448.616707] Code: c0 74 e6 4d 85 c9 c6 07 01 74 30 41 c7 41 08 01 00 00 00 e9 51 > > ff ff ff 83 fa 01 0f 84 af fe ff ff 8b 07 84 c0 74 08 f3 90 8b 07 <84> c0 75 f8 b8 01 00 00 00 66 89 07 5d c3 > > f3 90 4c 8b 09 4d 85 > > Mar 27 15:18:03 s15 kernel: [92476.574198] NMI watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [ksmd:64] > > Mar 27 15:18:03 s15 kernel: [92476.575563] Modules linked in: ... deleted ... see above > > Mar 27 15:18:03 s15 kernel: [92476.585693] CPU: 2 PID: 64 Comm: ksmd Tainted: G D L 4.11.0-rc2-stock #218 > > Mar 27 15:18:03 s15 kernel: [92476.587255] Hardware name: System manufacturer System Product Name/P8Z68-M PRO, BIOS 4003 05/09/2013 > > Mar 27 15:18:03 s15 kernel: [92476.588763] task: ffff88ea4c822d00 task.stack: ffffb10c01af8000 > > Mar 27 15:18:03 s15 kernel: [92476.590350] RIP: 0010:native_queued_spin_lock_slowpath+0x17c/0x1a0 > > Mar 27 15:18:03 s15 kernel: [92476.591862] RSP: 0018:ffffb10c01afbd70 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 > > Mar 27 15:18:03 s15 kernel: [92476.593367] RAX: 0000000000000101 RBX: ffff88e6757d7e10 RCX: 0000000000000001 > > Mar 27 15:18:03 s15 kernel: [92476.594974] RDX: 0000000000000101 RSI: 0000000000000001 RDI: ffffe4f740d5f5f0 > > Mar 27 15:18:03 s15 kernel: [92476.596494] RBP: ffffb10c01afbd70 R08: 0000000000000101 R09: ffff88e91e5c7b48 > > Mar 27 15:18:03 s15 kernel: [92476.598088] R10: 0000000000000000 R11: 00000000000003bd R12: ffffe4f740d5f5f0 > > Mar 27 15:18:03 s15 kernel: [92476.599686] R13: 0000000000000004 R14: ffff88e91e5c7b48 R15: ffffc00000000fff > > Mar 27 15:18:03 s15 kernel: [92476.601246] FS: 0000000000000000(0000) GS:ffff88ea5f280000(0000) knlGS:0000000000000000 > > Mar 27 15:18:03 s15 kernel: [92476.602880] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > Mar 27 15:18:03 s15 kernel: [92476.604438] CR2: 00007fb04f4a51e4 CR3: 00000000ac209000 CR4: 00000000000426e0 > > Mar 27 15:18:03 s15 kernel: [92476.606060] Call Trace: > > Mar 27 15:18:03 s15 kernel: [92476.607677] _raw_spin_lock+0x20/0x30 > > Mar 27 15:18:03 s15 kernel: [92476.609306] follow_page_pte+0x10c/0x650 > > Mar 27 15:18:03 s15 kernel: [92476.610918] follow_page_mask+0x1ee/0x5b0 > > Mar 27 15:18:03 s15 kernel: [92476.612464] ? find_vma+0x68/0x70 > > Mar 27 15:18:03 s15 kernel: [92476.614038] ksm_scan_thread+0xc08/0x12a0 > > Mar 27 15:18:03 s15 kernel: [92476.615522] ? wake_atomic_t_function+0x60/0x60 > > Mar 27 15:18:03 s15 kernel: [92476.617007] kthread+0x101/0x140 > > Mar 27 15:18:03 s15 kernel: [92476.618473] ? try_to_merge_with_ksm_page+0xa0/0xa0 > > Mar 27 15:18:03 s15 kernel: [92476.619923] ? kthread_create_on_node+0x60/0x60 > > Mar 27 15:18:03 s15 kernel: [92476.621415] ret_from_fork+0x2c/0x40 > > Mar 27 15:18:03 s15 kernel: [92476.622838] Code: c0 74 e6 4d 85 c9 c6 07 01 74 30 41 c7 41 08 01 00 00 00 e9 51 ff ff ff 83 > > fa 01 0f 84 af fe ff ff 8b 07 84 c0 74 08 f3 90 8b 07 <84> c0 75 f8 b8 01 00 00 00 66 89 07 5d c3 f3 90 4c 8b 09 4d 85 > > Mar 27 15:18:07 s15 kernel: [92480.606373] INFO: rcu_sched self-detected stall on CPU > > Mar 27 15:18:07 s15 kernel: [92480.607801] 2-...: (14977 ticks this GP) idle=851/140000000000001/0 softirq=1548471/1548471 > > fqs=7220 > > Mar 27 15:18:07 s15 kernel: [92480.609207] (t=15001 jiffies g=271179 c=271178 q=2337) > > Mar 27 15:18:07 s15 kernel: [92480.610374] INFO: rcu_sched detected stalls on CPUs/tasks: > > Mar 27 15:18:07 s15 kernel: [92480.610377] 2-...: (14977 ticks this GP) idle=851/140000000000001/0 softirq=1548471/1548471 > > fqs=7220 > > Mar 27 15:18:07 s15 kernel: [92480.610378] (detected by 0, t=15002 jiffies, g=271179, c=271178, q=2337) > > Mar 27 15:18:07 s15 kernel: [92480.610381] Sending NMI from CPU 0 to CPUs 2: > > Mar 27 15:18:07 s15 kernel: [92480.611374] NMI backtrace for cpu 2 > > Mar 27 15:18:07 s15 kernel: [92480.611375] CPU: 2 PID: 64 Comm: ksmd Tainted: G D L 4.11.0-rc2-stock #218 > > Mar 27 15:18:07 s15 kernel: [92480.611375] Hardware name: System manufacturer System Product Name/P8Z68-M PRO, BIOS 4003 05/09/2013 > > Mar 27 15:18:07 s15 kernel: [92480.611376] task: ffff88ea4c822d00 task.stack: ffffb10c01af8000 > > Mar 27 15:18:07 s15 kernel: [92480.611376] RIP: 0010:cfb_imageblit+0x4aa/0x4e0 > > Mar 27 15:18:07 s15 kernel: [92480.611376] RSP: 0018:ffff88ea5f283960 EFLAGS: 00000002 > > Mar 27 15:18:07 s15 kernel: [92480.611376] RAX: 0000000000010101 RBX: 0000000000000000 RCX: 0000000000000002 > > Mar 27 15:18:07 s15 kernel: [92480.611377] RDX: ffffb10c10584cb4 RSI: 0000000000010101 RDI: 0000000000000001 > > Mar 27 15:18:07 s15 kernel: [92480.611377] RBP: ffff88ea5f2839d8 R08: ffff88ea4485b15b R09: 0000000000cdcdcd > > Mar 27 15:18:07 s15 kernel: [92480.611377] R10: ffffffff83a84580 R11: 0000000000000001 R12: ffffb10c10584cb8 > > Mar 27 15:18:07 s15 kernel: [92480.611377] R13: ffffb10c10584d40 R14: ffff88ea4485b150 R15: ffffb10c10584b40 > > Mar 27 15:18:07 s15 kernel: [92480.611378] FS: 0000000000000000(0000) GS:ffff88ea5f280000(0000) knlGS:0000000000000000 > > Mar 27 15:18:07 s15 kernel: [92480.611378] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > Mar 27 15:18:07 s15 kernel: [92480.611378] CR2: 00007fb04f4a51e4 CR3: 00000000ac209000 CR4: 00000000000426e0 > > Mar 27 15:18:07 s15 kernel: [92480.611378] Call Trace: > > Mar 27 15:18:07 s15 kernel: [92480.611378] <IRQ> > > Mar 27 15:18:07 s15 kernel: [92480.611379] drm_fb_helper_cfb_imageblit+0x17/0x40 [drm_kms_helper] > > Mar 27 15:18:07 s15 kernel: [92480.611379] bit_putcs+0x2f2/0x560 > > Mar 27 15:18:07 s15 kernel: [92480.611379] ? soft_cursor+0x1ad/0x230 > > Mar 27 15:18:07 s15 kernel: [92480.611379] ? bit_cursor+0x646/0x680 > > Mar 27 15:18:07 s15 kernel: [92480.611379] ? bit_clear+0x110/0x110 > > Mar 27 15:18:07 s15 kernel: [92480.611380] fbcon_putcs+0xfd/0x130 > > Mar 27 15:18:07 s15 kernel: [92480.611380] fbcon_redraw.isra.23+0xe2/0x1d0 > > Mar 27 15:18:07 s15 kernel: [92480.611380] fbcon_scroll+0x10f/0xd60 > > Mar 27 15:18:07 s15 kernel: [92480.611380] con_scroll+0x16a/0x180 > > Mar 27 15:18:07 s15 kernel: [92480.611380] lf+0xa1/0xb0 > > Mar 27 15:18:07 s15 kernel: [92480.611381] vt_console_print+0x2b9/0x3e0 > > Mar 27 15:18:07 s15 kernel: [92480.611381] console_unlock+0x3f3/0x4d0 > > Mar 27 15:18:07 s15 kernel: [92480.611381] vprintk_emit+0x2d4/0x380 > > Mar 27 15:18:07 s15 kernel: [92480.611381] vprintk_default+0x29/0x50 > > Mar 27 15:18:07 s15 kernel: [92480.611381] vprintk_func+0x20/0x50 > > Mar 27 15:18:07 s15 kernel: [92480.611381] printk+0x52/0x6e > > Mar 27 15:18:07 s15 kernel: [92480.611382] rcu_check_callbacks+0x74f/0x8b0 > > Mar 27 15:18:07 s15 kernel: [92480.611382] ? account_system_index_time+0x63/0x70 > > Mar 27 15:18:07 s15 kernel: [92480.611382] ? tick_sched_handle.isra.15+0x60/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.611382] update_process_times+0x2f/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.611383] tick_sched_handle.isra.15+0x25/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.611383] tick_sched_timer+0x3d/0x70 > > Mar 27 15:18:07 s15 kernel: [92480.611383] __hrtimer_run_queues+0xe5/0x250 > > Mar 27 15:18:07 s15 kernel: [92480.611383] hrtimer_interrupt+0xb1/0x200 > > Mar 27 15:18:07 s15 kernel: [92480.611383] local_apic_timer_interrupt+0x38/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.611384] smp_apic_timer_interrupt+0x38/0x50 > > Mar 27 15:18:07 s15 kernel: [92480.611384] apic_timer_interrupt+0x89/0x90 > > Mar 27 15:18:07 s15 kernel: [92480.611384] RIP: 0010:native_queued_spin_lock_slowpath+0x17a/0x1a0 > > Mar 27 15:18:07 s15 kernel: [92480.611384] RSP: 0018:ffffb10c01afbd70 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 > > Mar 27 15:18:07 s15 kernel: [92480.611385] RAX: 0000000000000101 RBX: ffff88e6757d7e10 RCX: 0000000000000001 > > Mar 27 15:18:07 s15 kernel: [92480.611385] RDX: 0000000000000101 RSI: 0000000000000001 RDI: ffffe4f740d5f5f0 > > Mar 27 15:18:07 s15 kernel: [92480.611385] RBP: ffffb10c01afbd70 R08: 0000000000000101 R09: ffff88e91e5c7b48 > > Mar 27 15:18:07 s15 kernel: [92480.611385] R10: 0000000000000000 R11: 00000000000003bd R12: ffffe4f740d5f5f0 > > Mar 27 15:18:07 s15 kernel: [92480.611386] R13: 0000000000000004 R14: ffff88e91e5c7b48 R15: ffffc00000000fff > > Mar 27 15:18:07 s15 kernel: [92480.611386] </IRQ> > > Mar 27 15:18:07 s15 kernel: [92480.611386] _raw_spin_lock+0x20/0x30 > > Mar 27 15:18:07 s15 kernel: [92480.611386] follow_page_pte+0x10c/0x650 > > Mar 27 15:18:07 s15 kernel: [92480.611386] follow_page_mask+0x1ee/0x5b0 > > Mar 27 15:18:07 s15 kernel: [92480.611387] ? find_vma+0x68/0x70 > > Mar 27 15:18:07 s15 kernel: [92480.611387] ksm_scan_thread+0xc08/0x12a0 > > Mar 27 15:18:07 s15 kernel: [92480.611387] ? wake_atomic_t_function+0x60/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.611387] kthread+0x101/0x140 > > Mar 27 15:18:07 s15 kernel: [92480.611387] ? try_to_merge_with_ksm_page+0xa0/0xa0 > > Mar 27 15:18:07 s15 kernel: [92480.611388] ? kthread_create_on_node+0x60/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.611388] ret_from_fork+0x2c/0x40 > > Mar 27 15:18:07 s15 kernel: [92480.611388] Code: 4d 89 f0 b9 08 00 00 00 89 5d d0 4d 8d 2c 07 eb 2c 41 0f be 00 29 f9 4c 8d > > 62 04 d3 f8 44 21 d8 41 8b 1c 82 44 21 cb 89 d8 31 f0 <89> 02 85 c9 75 09 49 83 c0 01 b9 08 00 00 00 4c 89 e2 49 39 d5 > > Mar 27 15:18:07 s15 kernel: [92480.682314] NMI backtrace for cpu 2 > > Mar 27 15:18:07 s15 kernel: [92480.683111] CPU: 2 PID: 64 Comm: ksmd Tainted: G D L 4.11.0-rc2-stock #218 > > Mar 27 15:18:07 s15 kernel: [92480.683894] Hardware name: System manufacturer System Product Name/P8Z68-M PRO, BIOS 4003 05/09/2013 > > Mar 27 15:18:07 s15 kernel: [92480.684685] Call Trace: > > Mar 27 15:18:07 s15 kernel: [92480.685523] <IRQ> > > Mar 27 15:18:07 s15 kernel: [92480.686304] dump_stack+0x63/0x90 > > Mar 27 15:18:07 s15 kernel: [92480.687092] nmi_cpu_backtrace+0x95/0xa0 > > Mar 27 15:18:07 s15 kernel: [92480.687849] ? irq_force_complete_move+0x140/0x140 > > Mar 27 15:18:07 s15 kernel: [92480.688609] nmi_trigger_cpumask_backtrace+0xe7/0x120 > > Mar 27 15:18:07 s15 kernel: [92480.689418] arch_trigger_cpumask_backtrace+0x19/0x20 > > Mar 27 15:18:07 s15 kernel: [92480.690179] rcu_dump_cpu_stacks+0x9d/0xda > > Mar 27 15:18:07 s15 kernel: [92480.690955] rcu_check_callbacks+0x75f/0x8b0 > > Mar 27 15:18:07 s15 kernel: [92480.691704] ? account_system_index_time+0x63/0x70 > > Mar 27 15:18:07 s15 kernel: [92480.692449] ? tick_sched_handle.isra.15+0x60/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.693283] update_process_times+0x2f/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.694016] tick_sched_handle.isra.15+0x25/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.694771] tick_sched_timer+0x3d/0x70 > > Mar 27 15:18:07 s15 kernel: [92480.695500] __hrtimer_run_queues+0xe5/0x250 > > Mar 27 15:18:07 s15 kernel: [92480.696224] hrtimer_interrupt+0xb1/0x200 > > Mar 27 15:18:07 s15 kernel: [92480.696998] local_apic_timer_interrupt+0x38/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.697743] smp_apic_timer_interrupt+0x38/0x50 > > Mar 27 15:18:07 s15 kernel: [92480.698502] apic_timer_interrupt+0x89/0x90 > > Mar 27 15:18:07 s15 kernel: [92480.699240] RIP: 0010:native_queued_spin_lock_slowpath+0x17a/0x1a0 > > Mar 27 15:18:07 s15 kernel: [92480.699990] RSP: 0018:ffffb10c01afbd70 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 > > Mar 27 15:18:07 s15 kernel: [92480.700820] RAX: 0000000000000101 RBX: ffff88e6757d7e10 RCX: 0000000000000001 > > Mar 27 15:18:07 s15 kernel: [92480.701592] RDX: 0000000000000101 RSI: 0000000000000001 RDI: ffffe4f740d5f5f0 > > Mar 27 15:18:07 s15 kernel: [92480.702379] RBP: ffffb10c01afbd70 R08: 0000000000000101 R09: ffff88e91e5c7b48 > > Mar 27 15:18:07 s15 kernel: [92480.703184] R10: 0000000000000000 R11: 00000000000003bd R12: ffffe4f740d5f5f0 > > Mar 27 15:18:07 s15 kernel: [92480.703970] R13: 0000000000000004 R14: ffff88e91e5c7b48 R15: ffffc00000000fff > > Mar 27 15:18:07 s15 kernel: [92480.704811] </IRQ> > > Mar 27 15:18:07 s15 kernel: [92480.705605] _raw_spin_lock+0x20/0x30 > > Mar 27 15:18:07 s15 kernel: [92480.706431] follow_page_pte+0x10c/0x650 > > Mar 27 15:18:07 s15 kernel: [92480.707233] follow_page_mask+0x1ee/0x5b0 > > Mar 27 15:18:07 s15 kernel: [92480.708092] ? find_vma+0x68/0x70 > > Mar 27 15:18:07 s15 kernel: [92480.708918] ksm_scan_thread+0xc08/0x12a0 > > Mar 27 15:18:07 s15 kernel: [92480.709720] ? wake_atomic_t_function+0x60/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.710557] kthread+0x101/0x140 > > Mar 27 15:18:07 s15 kernel: [92480.711364] ? try_to_merge_with_ksm_page+0xa0/0xa0 > > Mar 27 15:18:07 s15 kernel: [92480.712221] ? kthread_create_on_node+0x60/0x60 > > Mar 27 15:18:07 s15 kernel: [92480.713038] ret_from_fork+0x2c/0x40 > > > > > > -- > > To unsubscribe, send a message with 'unsubscribe linux-mm' in > > the body to majordomo@xxxxxxxxx. For more info on Linux MM, > > see: http://www.linux-mm.org/ . > > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> > > -- > Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
