[Bug 1885944] Missing required logs.

This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1885944

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
Status: New => Incomplete

** Tags added: bionic

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https://bugs.launchpad.net/bugs/1885944

Title:
Oops: 0010 [#1] SMP PTI, at <do_page_fault>: "push %rbp" address

Status in linux package in Ubuntu:
Incomplete

Bug description:
Kernel is Oopsing with following message:
"BUG: unable to handle kernel paging request at ffffffff81a65350"

Ubuntu: 16.04
Deb package: linux-image-4.15.0-1055-azure

Frequency: Occured once a month. After upgrading to
~4.15.0-1067-azure~, didn't occur (?yet?).


CONTEXT:
#+begin_quote
KERNEL: /usr/lib/debug/boot/vmlinux-4.15.0-1055-azure
DUMPFILE: dump.202005300113 [PARTIAL DUMP]
CPUS: 16
DATE: Sat May 30 01:09:00 2020
UPTIME: 14 days, 09:00:57
LOAD AVERAGE: 8.11, 7.01, 7.21
TASKS: 2264
RELEASE: 4.15.0-1055-azure
VERSION: #60-Ubuntu SMP Thu Aug 8 18:29:07 UTC 2019
MACHINE: x86_64 (2693 Mhz)
MEMORY: 32 GB
PANIC: "BUG: unable to handle kernel paging request at ffffffff81a65350"
PID: 52632
COMMAND: "nscd"
TASK: ffff936ba34e5940 [THREAD_INFO: ffff936ba34e5940]
CPU: 8
STATE: TASK_RUNNING (PANIC)
#+end_quote


PANIC INFO ("modules used" included):
#+begin_quote
[4967328.882291] unable to execute userspace code (SMEP?) (uid: 112)
[4967328.884021] BUG: unable to handle kernel paging request at ffffffff81a65350
[4967328.884021] IP: do_page_fault+0x0/0x130
[4967328.884021] PGD 88ba0c067 P4D 88ba0c067 PUD 88ba0d063 PMD 88a8000e1
[4967328.884021] Oops: 0010 [#1] SMP PTI
[4967328.884021] Modules linked in: binfmt_misc unix_diag ip6table_filter ip6_tables nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_security ipt_REJECT nf_reject_ipv4 xt_tcpudp xt_owner iptable_filter ip_tables x_tables kvm_intel kvm irqbypass hv_balloon serio_raw joydev ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi 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 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel hid_generic aes_x86_64 crypto_simd hyperv_fb glue_helper hid_hyperv cfbfillrect cfbimgblt cryptd pata_acpi hid hv_netvsc hv_utils cfbcopyarea hyperv_keyboard
[4967328.956026] CPU: 8 PID: 52632 Comm: nscd Not tainted 4.15.0-1055-azure #60-Ubuntu
[4967328.956026] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017
[4967328.956026] RIP: 0010:do_page_fault+0x0/0x130
[4967328.956026] RSP: 0018:fffffe0000167920 EFLAGS: 00010093
[4967328.956026] RAX: 00000000824009f7 RBX: 0000000000000000 RCX: ffffffff824009f7
[4967328.956026] RDX: 00000000ffff9372 RSI: 0000000000000010 RDI: fffffe0000167928
[4967328.956026] RBP: fffffe0000167929 R08: 0000000000000000 R09: 0000000000000000
[4967328.956026] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[4967328.956026] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[4967328.956026] FS: 00007f4722c94740(0000) GS:ffff93729d800000(0000) knlGS:0000000000000000
[4967328.956026] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[4967328.956026] CR2: ffffffff81a65350 CR3: 0000000872f4a002 CR4: 00000000003606e0
[4967328.956026] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[4967328.956026] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[4967328.956026] Call Trace:
[4967328.956026] <#DF>
[4967328.956026] ? page_fault+0x25/0x50
[4967328.956026] ? native_iret+0x7/0x7
[4967328.956026] ? __do_page_fault+0x4d0/0x4d0
[4967328.956026] ? page_fault+0x25/0x50
[4967328.956026] ? native_iret+0x7/0x7
[4967328.956026] ? __do_page_fault+0x4d0/0x4d0
[4967328.956026] ? page_fault+0x25/0x50
[4967328.956026] ? native_iret+0x7/0x7
[4967328.956026] ? __do_page_fault+0x4d0/0x4d0
[4967328.956026] ? page_fault+0x25/0x50
[4967328.956026] ? native_iret+0x7/0x7
[4967328.956026] ? __do_page_fault+0x4d0/0x4d0
[4967328.956026] ? page_fault+0x25/0x50
[4967328.956026] ? native_iret+0x7/0x7
[4967328.956026] ? __do_page_fault+0x4d0/0x4d0
[4967328.956026] ? page_fault+0x25/0x50
[4967328.956026] ? native_iret+0x7/0x7
[4967328.956026] ? __do_page_fault+0x4d0/0x4d0
[4967328.956026] ? page_fault+0x25/0x50
[4967328.956026] ? native_iret+0x7/0x7
[4967328.956026] ? __do_page_fault+0x4d0/0x4d0
[4967328.956026] ? page_fault+0x25/0x50
[4967328.956026] ? native_iret+0x7/0x7
[4967328.956026] ? __do_page_fault+0x4d0/0x4d0
[4967328.956026] ? page_fault+0x25/0x50
[4967329.124013] ? handle_stack_overflow+0x50/0x50
[4967329.124013] ? double_fault+0x1e/0x30
[4967329.124013] ? native_iret+0x7/0x7
[4967329.124013] ? page_fault+0xa/0x50
[4967329.124013] </#DF>
[4967329.124013] Code: 84 01 00 48 89 de 48 c7 c7 c8 a2 a7 82 c6 05 57 c6 3d 01 01 e8 c2 b4 07 00 e9 60 fd ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 49 89 f5 41 54 49 89 fc 53 0f 20
[4967329.152018] RIP: do_page_fault+0x0/0x130 RSP: fffffe0000167920
[4967329.152018] CR2: ffffffff81a65350
#+end_quote


SYSTEM INFORMATION:
#+begin_quote
DMI_BIOS_VENDOR: American Megatrends Inc.
DMI_BIOS_VERSION: 090007
DMI_BIOS_DATE: 06/02/2017
DMI_SYS_VENDOR: Microsoft Corporation
DMI_PRODUCT_NAME: Virtual Machine
DMI_PRODUCT_VERSION: 7.0
DMI_PRODUCT_SERIAL: 0000-0007-0266-2085-8407-7986-85
DMI_PRODUCT_UUID: 71928361-BF2C-9D47-8CF3-354C9F5EA739
DMI_BOARD_VENDOR: Microsoft Corporation
DMI_BOARD_NAME: Virtual Machine
DMI_BOARD_VERSION: 7.0
DMI_BOARD_SERIAL: 0000-0010-1565-2018-7858-1676-09
DMI_CHASSIS_VENDOR: Microsoft Corporation
DMI_CHASSIS_TYPE: 3
DMI_CHASSIS_VERSION: 7.0
DMI_CHASSIS_SERIAL: 9935-0359-4239-3718-1407-0515-72
DMI_CHASSIS_ASSET_TAG: 7783-7084-3265-9085-8269-3286-77
#+end_quote


MEM INFO:
#+begin_quote
PAGES TOTAL PERCENTAGE
TOTAL MEM 8196822 31.3 GB ----
FREE 3012013 11.5 GB 36% of TOTAL MEM
USED 5184809 19.8 GB 63% of TOTAL MEM
SHARED 2023123 7.7 GB 24% of TOTAL MEM
BUFFERS 30113 117.6 MB 0% of TOTAL MEM
CACHED 2094507 8 GB 25% of TOTAL MEM
SLAB 871805 3.3 GB 10% of TOTAL MEM

TOTAL HUGE 0 0 ----
HUGE FREE 0 0 0% of TOTAL HUGE

TOTAL SWAP 0 0 ----
SWAP USED 0 0 0% of TOTAL SWAP
SWAP FREE 0 0 0% of TOTAL SWAP

COMMIT LIMIT 4098411 15.6 GB ----
COMMITTED 6184598 23.6 GB 150% of TOTAL LIMIT
#+end_quote


STACKS (FOR ALL ON-CPU PROCESSES) NOT ACCESSSIBLE (PID:52632 is faulting one):
#+begin_quote
PID: 0 TASK: ffffffff82c11480 CPU: 0 COMMAND: "swapper/0"
bt: seek error: kernel virtual address: fffffe0000007000 type: "stack contents"
bt: read of stack at fffffe0000007000 failed

PID: 0 TASK: ffff937299909dc0 CPU: 1 COMMAND: "swapper/1"
bt: seek error: kernel virtual address: fffffe0000033000 type: "stack contents"
bt: read of stack at fffffe0000033000 failed

PID: 0 TASK: ffff937299915940 CPU: 2 COMMAND: "swapper/2"
bt: seek error: kernel virtual address: fffffe000005f000 type: "stack contents"
bt: read of stack at fffffe000005f000 failed

PID: 0 TASK: ffff937299911dc0 CPU: 3 COMMAND: "swapper/3"
bt: seek error: kernel virtual address: fffffe000008b000 type: "stack contents"
bt: read of stack at fffffe000008b000 failed

PID: 52637 TASK: ffff936f01521dc0 CPU: 4 COMMAND: "chrome"
bt: seek error: kernel virtual address: fffffe00000b7000 type: "stack contents"
bt: read of stack at fffffe00000b7000 failed

PID: 0 TASK: ffff937299910000 CPU: 5 COMMAND: "swapper/5"
bt: seek error: kernel virtual address: fffffe00000e3000 type: "stack contents"
bt: read of stack at fffffe00000e3000 failed

PID: 0 TASK: ffff937299945940 CPU: 6 COMMAND: "swapper/6"
bt: seek error: kernel virtual address: fffffe000010f000 type: "stack contents"
bt: read of stack at fffffe000010f000 failed

PID: 51862 TASK: ffff93715362d940 CPU: 7 COMMAND: "chrome"
bt: seek error: kernel virtual address: fffffe000013b000 type: "stack contents"
bt: read of stack at fffffe000013b000 failed

PID: 52632 TASK: ffff936ba34e5940 CPU: 8 COMMAND: "nscd"
bt: seek error: kernel virtual address: fffffe0000167000 type: "stack contents"
bt: read of stack at fffffe0000167000 failed

PID: 0 TASK: ffff937299940000 CPU: 9 COMMAND: "swapper/9"
bt: seek error: kernel virtual address: fffffe0000193000 type: "stack contents"
bt: read of stack at fffffe0000193000 failed

PID: 0 TASK: ffff937299969dc0 CPU: 10 COMMAND: "swapper/10"
bt: seek error: kernel virtual address: fffffe00001bf000 type: "stack contents"
bt: read of stack at fffffe00001bf000 failed

PID: 0 TASK: ffff93729996bb80 CPU: 11 COMMAND: "swapper/11"
bt: seek error: kernel virtual address: fffffe00001eb000 type: "stack contents"
bt: read of stack at fffffe00001eb000 failed

PID: 0 TASK: ffff937299968000 CPU: 12 COMMAND: "swapper/12"
bt: seek error: kernel virtual address: fffffe0000217000 type: "stack contents"
bt: read of stack at fffffe0000217000 failed

PID: 0 TASK: ffff93729996d940 CPU: 13 COMMAND: "swapper/13"
bt: seek error: kernel virtual address: fffffe0000243000 type: "stack contents"
bt: read of stack at fffffe0000243000 failed

PID: 0 TASK: ffff937299971dc0 CPU: 14 COMMAND: "swapper/14"
bt: seek error: kernel virtual address: fffffe000026f000 type: "stack contents"
bt: read of stack at fffffe000026f000 failed

PID: 0 TASK: ffff937299973b80 CPU: 15 COMMAND: "swapper/15"
bt: seek error: kernel virtual address: fffffe000029b000 type: "stack contents"
bt: read of stack at fffffe000029b000 failed
#+end_quote


FAULTING ADDRESS (~0xffffffff81a65350~):
#+begin_quote
VIRTUAL PHYSICAL
ffffffff81a65350 88a865350

PGD DIRECTORY: ffffffff82c0a000
PAGE DIRECTORY: 88ba0c067
PUD: 88ba0cff0 => 88ba0d063
PMD: 88ba0d068 => 88a8000e1
PAGE: 88a800000 (2MB)

PTE PHYSICAL FLAGS
88a8000e1 88a800000 (PRESENT|ACCESSED|DIRTY|PSE)

PAGE PHYSICAL MAPPING INDEX CNT FLAGS
fffff4da222a1940 88a865000 0 0 1 17ffffc0000800 reserved
#+end_quote


Is memory location accessibility information under "%RSP" needed?


AND CODE:
#+begin_quote
/build/linux-azure-1_z7X4/linux-azure-4.15.0/arch/x86/mm/fault.c: 1534
0xffffffff81a65350 <do_page_fault>: push %rbp
0xffffffff81a65351 <do_page_fault+1>: mov %rsp,%rbp
0xffffffff81a65354 <do_page_fault+4>: push %r15
0xffffffff81a65356 <do_page_fault+6>: push %r14
0xffffffff81a65358 <do_page_fault+8>: push %r13
0xffffffff81a6535a <do_page_fault+10>: mov %rsi,%r13
0xffffffff81a6535d <do_page_fault+13>: push %r12
0xffffffff81a6535f <do_page_fault+15>: mov %rdi,%r12
0xffffffff81a65362 <do_page_fault+18>: push %rbx
/build/linux-azure-1_z7X4/linux-azure-4.15.0/arch/x86/include/asm/paravirt.h: 57
0xffffffff81a65363 <do_page_fault+19>: mov %cr2,%rax
0xffffffff81a65366 <do_page_fault+22>: nopl 0x0(%rax)
#+end_quote


TAINTED MASK:
#+begin_quote
TAINTED_MASK: 0
#+end_quote


BOOT LOG (includes boot params):
see file:boot.log attache


NOTE: no access to faulting instance of virtual machine image. Following comes from another instance of the same vm image:
#+begin_quote
ProblemType: Bug
ApportVersion: 2.20.1-0ubuntu2.19
Architecture: amd64
Date: Wed Jul 1 16:57:32 2020
Dependencies:
adduser 3.113+nmu3ubuntu4
apt 1.2.32
apt-utils 1.2.32
coreutils 8.25-2ubuntu3~16.04
debconf 1.5.58ubuntu2
debconf-i18n 1.5.58ubuntu2
debianutils 4.7
dmsetup 2:1.02.110-1ubuntu10
dpkg 1.18.4ubuntu1.6
gcc-5-base 5.4.0-6ubuntu1~16.04.12
gcc-6-base 6.0.1-0ubuntu1
gettext-base 0.19.7-2ubuntu3.1
gnupg 1.4.20-1ubuntu3.3
gpgv 1.4.20-1ubuntu3.3
grub-common 2.02~beta2-36ubuntu3.22
grub-gfxpayload-lists 0.7
grub-pc 2.02~beta2-36ubuntu3.22
grub-pc-bin 2.02~beta2-36ubuntu3.22
grub2-common 2.02~beta2-36ubuntu3.22
init-system-helpers 1.29ubuntu4
kmod 22-1ubuntu5.2
libacl1 2.2.52-3
libapt-inst2.0 1.2.32
libapt-pkg5.0 1.2.32
libasprintf0v5 0.19.7-2ubuntu3.1
libattr1 1:2.4.47-2
libaudit-common 1:2.4.5-1ubuntu2.1
libaudit1 1:2.4.5-1ubuntu2.1
libblkid1 2.27.1-6ubuntu3.7
libbz2-1.0 1.0.6-8ubuntu0.2
libc6 2.23-0ubuntu11
libdb5.3 5.3.28-11ubuntu0.2
libdevmapper1.02.1 2:1.02.110-1ubuntu10
libfdisk1 2.27.1-6ubuntu3.7
libfreetype6 2.6.1-0.1ubuntu2.3
libfuse2 2.9.4-1ubuntu3.1
libgcc1 1:6.0.1-0ubuntu1
libgcrypt20 1.6.5-2ubuntu0.5
libgpg-error0 1.21-2ubuntu1
libgpm2 1.20.4-6.1
libkmod2 22-1ubuntu5.2
liblocale-gettext-perl 1.07-1build1
liblz4-1 0.0~r131-2ubuntu2
liblzma5 5.1.1alpha+20120614-2ubuntu2
libmount1 2.27.1-6ubuntu3.7
libncursesw5 6.0+20160213-1ubuntu1
libpam-modules 1.1.8-3.2ubuntu2.1
libpam-modules-bin 1.1.8-3.2ubuntu2.1
libpam0g 1.1.8-3.2ubuntu2.1
libpcre3 2:8.38-3.1
libpng12-0 1.2.54-1ubuntu1.1
libreadline6 6.3-8ubuntu2
libselinux1 2.4-3build2
libsemanage-common 2.3-1build3
libsemanage1 2.3-1build3
libsepol1 2.4-2
libsmartcols1 2.27.1-6ubuntu3.7
libstdc++6 5.4.0-6ubuntu1~16.04.12
libsystemd0 229-4ubuntu21.22
libtext-charwidth-perl 0.04-7build5
libtext-iconv-perl 1.7-5build4
libtext-wrapi18n-perl 0.06-7.1
libtinfo5 6.0+20160213-1ubuntu1
libudev1 229-4ubuntu21.22
libusb-0.1-4 2:0.1.12-28
libustr-1.0-1 1.0.4-5
libuuid1 2.27.1-6ubuntu3.7
linux-base 4.5ubuntu1~16.04.1
linux-modules-4.15.0-1055-azure 4.15.0-1055.60
lsb-base 9.20160110ubuntu0.2
multiarch-support 2.23-0ubuntu11
os-prober 1.70ubuntu3.3
passwd 1:4.2-3.1ubuntu5.4
perl-base 5.22.1-9ubuntu0.6
readline-common 6.3-8ubuntu2
sensible-utils 0.0.9ubuntu0.16.04.1
sysvinit-utils 2.88dsf-59.3ubuntu2
tar 1.28-2.1ubuntu0.1
ubuntu-keyring 2012.05.19
ucf 3.0036
util-linux 2.27.1-6ubuntu3.7
uuid-runtime 2.27.1-6ubuntu3.7
zlib1g 1:1.2.8.dfsg-2ubuntu4.1
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-1055-azure 4.15.0-1055.60
PackageArchitecture: amd64
ProcCpuinfoMinimal:
processor : 15
vendor_id : GenuineIntel
cpu family : 6
model : 85
model name : Intel(R) Xeon(R) Platinum 8168 CPU @ 2.70GHz
stepping : 4
microcode : 0xffffffff
cpu MHz : 2693.724
cache size : 33792 KB
physical id : 0
siblings : 16
core id : 7
cpu cores : 8
apicid : 15
initial apicid : 15
fpu : yes
fpu_exception : yes
cpuid level : 21
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti tpr_shadow vnmi ept vpid fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap clflushopt avx512cd avx512bw avx512vl xsaveopt xsavec xsaves md_clear
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs
bogomips : 5387.44
clflush size : 64
cache_alignment : 64
address sizes : 44 bits physical, 48 bits virtual
power management:
ProcEnviron:
LC_TIME=pl_PL.UTF-8
LC_MONETARY=pl_PL.UTF-8
LC_CTYPE=''
TERM=dumb
PATH=(custom, no user)
LC_ADDRESS=pl_PL.UTF-8
XDG_RUNTIME_DIR=<set>
LC_TELEPHONE=pl_PL.UTF-8
LANG=en_US.UTF-8
SHELL=/bin/bash
LC_NAME=pl_PL.UTF-8
LC_MEASUREMENT=pl_PL.UTF-8
LC_IDENTIFICATION=pl_PL.UTF-8
LC_NUMERIC=pl_PL.UTF-8
LC_PAPER=pl_PL.UTF-8
ProcVersionSignature: User Name 4.15.0-1055.60-azure 4.15.18
SourcePackage: linux-signed-azure
Tags: xenial uec-images
Uname: Linux 4.15.0-1055-azure x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
_MarkForUpload: True
#+end_quote

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