Comment 16 for bug 1837810

Revision history for this message
norman shen (jshen28) wrote :

Interestingly, I hit this warning log without enabling ksm

```console
# cat /sys/kernel/mm/ksm/run
0
# uname -a
Linux compute12 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic
```

log is

[Sat May 15 11:28:32 2021] WARNING: CPU: 31 PID: 3196546 at /build/linux-E6MDAa/linux-4.15.0/include/linux/mm.h:857 follow_page_pte+0x663/0x6d0
[Sat May 15 11:28:32 2021] Modules linked in: nls_iso8859_1 act_police cls_u32 sch_ingress cls_fw sch_sfq sch_htb ip6table_raw xt_CT xt_mac vhost_net vhost tap ebtable_filter ebtables ip6table_filter devlink vxlan ip6_udp_tunnel udp_tunnel ip_gre gre xt_multiport xt_set iptable_raw iptable_mangle ip_set_hash_net ip_set_hash_ip ip_set ipip tunnel4 ip_tunnel veth xt_statistic xt_physdev xt_nat xt_recent ipt_REJECT nf_reject_ipv4 xt_tcpudp xt_addrtype ip_vs_sh ip_vs_wrr ip_vs_rr ip_vs ip6table_nat ip6_tables xt_comment xt_mark iptable_filter xt_conntrack nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat aufs rbd libceph overlay openvswitch nsh nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat bonding dm_service_time dm_multipath
[Sat May 15 11:28:32 2021] scsi_dh_rdac scsi_dh_emc scsi_dh_alua intel_rapl skx_edac x86_pkg_temp_thermal coretemp kvm_intel kvm irqbypass intel_cstate intel_rapl_perf ipmi_ssif ioatdma joydev input_leds acpi_power_meter mei_me mei shpchp mac_hid ipmi_si ipmi_devintf ipmi_msghandler lpc_ich sch_fq_codel nf_conntrack ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi br_netfilter bridge stp llc ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ses enclosure scsi_transport_sas hid_generic crct10dif_pclmul crc32_pclmul usbhid ghash_clmulni_intel hid pcbc lpfc aesni_intel aes_x86_64 nvmet_fc crypto_simd ast glue_helper nvmet cryptd nvme_fc ttm nvme_fabrics
[Sat May 15 11:28:32 2021] igb nvme_core drm_kms_helper dca scsi_transport_fc syscopyarea i2c_algo_bit sysfillrect sysimgblt i40e aacraid fb_sys_fops drm ptp pps_core ahci libahci wmi
[Sat May 15 11:28:32 2021] CPU: 31 PID: 3196546 Comm: CPU 2/KVM Not tainted 4.15.0-72-generic #81-Ubuntu
[Sat May 15 11:28:32 2021] Hardware name: Inspur NF5280M5/YZMB-00882-104, BIOS 4.0.8 10/17/2018
[Sat May 15 11:28:32 2021] RIP: 0010:follow_page_pte+0x663/0x6d0
[Sat May 15 11:28:32 2021] RSP: 0018:ffffb1eff4e5b8f8 EFLAGS: 00010286
[Sat May 15 11:28:32 2021] RAX: ffffe041b58cba40 RBX: ffffe043fed90cf0 RCX: 0000000080000000
[Sat May 15 11:28:32 2021] RDX: ffffe041b58cba40 RSI: 00007f7306766000 RDI: 8000000d632e9225
[Sat May 15 11:28:32 2021] RBP: ffffb1eff4e5b960 R08: 8000000d632e9225 R09: ffffa0249cceb1e0
[Sat May 15 11:28:32 2021] R10: 0000000000000000 R11: ffffb1eff4e5ba8c R12: ffffe041b58cba40
[Sat May 15 11:28:32 2021] R13: 00003ffffffff000 R14: 0000000000000326 R15: ffffa076af75a198
[Sat May 15 11:28:32 2021] FS: 00007f73f48ee700(0000) GS:ffffa0947f2c0000(0000) knlGS:fffff88001e81000
[Sat May 15 11:28:32 2021] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Sat May 15 11:28:32 2021] CR2: fffff8a016819000 CR3: 0000004e72518004 CR4: 00000000007626e0
[Sat May 15 11:28:32 2021] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[Sat May 15 11:28:32 2021] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[Sat May 15 11:28:32 2021] PKRU: 55555554
[Sat May 15 11:28:32 2021] Call Trace:
[Sat May 15 11:28:32 2021] follow_pmd_mask+0x209/0x640
[Sat May 15 11:28:32 2021] follow_page_mask+0x17a/0x210
[Sat May 15 11:28:32 2021] __get_user_pages+0x18c/0x720
[Sat May 15 11:28:32 2021] get_user_pages+0x42/0x50
[Sat May 15 11:28:32 2021] __gfn_to_pfn_memslot+0x126/0x410 [kvm]
[Sat May 15 11:28:32 2021] try_async_pf+0x66/0x1f0 [kvm]
[Sat May 15 11:28:32 2021] tdp_page_fault+0x138/0x290 [kvm]
[Sat May 15 11:28:32 2021] ? vmexit_fill_RSB+0x1c/0x40 [kvm_intel]
[Sat May 15 11:28:32 2021] kvm_mmu_page_fault+0x62/0x160 [kvm]
[Sat May 15 11:28:32 2021] handle_ept_violation+0xbb/0x150 [kvm_intel]
[Sat May 15 11:28:32 2021] vmx_handle_exit+0xb3/0xe80 [kvm_intel]
[Sat May 15 11:28:32 2021] ? vmexit_fill_RSB+0x1c/0x40 [kvm_intel]
[Sat May 15 11:28:32 2021] ? vmexit_fill_RSB+0x10/0x40 [kvm_intel]
[Sat May 15 11:28:32 2021] ? vmexit_fill_RSB+0x1c/0x40 [kvm_intel]
[Sat May 15 11:28:32 2021] ? vmexit_fill_RSB+0x10/0x40 [kvm_intel]
[Sat May 15 11:28:32 2021] ? vmx_vcpu_run+0x3fa/0x600 [kvm_intel]
[Sat May 15 11:28:32 2021] vcpu_enter_guest+0x424/0x1260 [kvm]
[Sat May 15 11:28:32 2021] ? __schedule+0x256/0x880
[Sat May 15 11:28:32 2021] kvm_arch_vcpu_ioctl_run+0x203/0x3e0 [kvm]
[Sat May 15 11:28:32 2021] ? kvm_arch_vcpu_ioctl_run+0x203/0x3e0 [kvm]
[Sat May 15 11:28:32 2021] kvm_vcpu_ioctl+0x2a6/0x620 [kvm]
[Sat May 15 11:28:32 2021] ? do_futex+0x185/0x590
[Sat May 15 11:28:32 2021] do_vfs_ioctl+0xa8/0x630
[Sat May 15 11:28:32 2021] ? SyS_futex+0x13b/0x180
[Sat May 15 11:28:32 2021] SyS_ioctl+0x79/0x90
[Sat May 15 11:28:32 2021] ? fire_user_return_notifiers+0x3e/0x50
[Sat May 15 11:28:32 2021] do_syscall_64+0x73/0x130
[Sat May 15 11:28:32 2021] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Sat May 15 11:28:32 2021] RIP: 0033:0x7f73ff02f5d7
[Sat May 15 11:28:32 2021] RSP: 002b:00007f73f48ed818 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[Sat May 15 11:28:32 2021] RAX: ffffffffffffffda RBX: 000000000000ae80 RCX: 00007f73ff02f5d7
[Sat May 15 11:28:32 2021] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000017
[Sat May 15 11:28:32 2021] RBP: 000055d6a736d3f0 R08: 000055d6a5edf270 R09: 000000000000ffff
[Sat May 15 11:28:32 2021] R10: 000000000000000c R11: 0000000000000246 R12: 0000000000000000
[Sat May 15 11:28:32 2021] R13: 00007f7404cd6000 R14: 0000000000000000 R15: 000055d6a736d3f0
[Sat May 15 11:28:32 2021] Code: 20 41 bd ef ff ff ff 48 39 c8 74 17 48 8b 45 d0 48 8b 75 c0 48 8b 55 b8 48 8b 78 40 e8 f7 c8 e5 ff 66 90 4d 63 e5 e9 1e fd ff ff <0f> 0b 49 c7 c4 f4 ff ff ff e9 10 fd ff ff f0 48 83 2f 01 0f 85
[Sat May 15 11:28:32 2021] ---[ end trace 5685e985b988fffa ]---