[Ubuntu16.10]KV4.8: OOPs while updating initramfs

[bugproxy]

== Comment: #0 - NAGESWARA R. SASTRY <email address hidden> - 2016-09-22 06:40:59 ==
---Problem Description---
Try installing btrfs-progs using 'apt install -y btrfs-progs'
At the time of updating initramfs seeing a 'segfault' and kernel OOPs

Contact Information = <email address hidden>

---uname output---
Linux pkvmhab010 4.8.0-11-generic #12-Ubuntu SMP Sat Sep 17 19:58:16 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux

Machine Type = 8348-21C

---Debugger---
A debugger is not configured

---Steps to Reproduce---
 # apt install -y btrfs-progs/yakkety
Reading package lists... Done
Building dependency tree
Reading state information... Done
Selected version '4.7-1' (Ubuntu:16.10/yakkety [ppc64el]) for 'btrfs-progs'
The following package was automatically installed and is no longer required:
  libprotobuf-lite9v5
Use 'apt autoremove' to remove it.
The following additional packages will be installed:
  liblzo2-2
The following NEW packages will be installed:
  btrfs-progs liblzo2-2
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 629 kB of archives.
After this operation, 5,987 kB of additional disk space will be used.
Get:1 http://us.ports.ubuntu.com/ubuntu-ports yakkety/main ppc64el liblzo2-2 ppc64el 2.08-1.2 [67.2 kB]
Get:2 http://us.ports.ubuntu.com/ubuntu-ports yakkety/main ppc64el btrfs-progs ppc64el 4.7-1 [562 kB]
Fetched 629 kB in 0s (2,416 kB/s)
Selecting previously unselected package liblzo2-2:ppc64el.
(Reading database ... 129624 files and directories currently installed.)
Preparing to unpack .../0-liblzo2-2_2.08-1.2_ppc64el.deb ...
Unpacking liblzo2-2:ppc64el (2.08-1.2) ...
Selecting previously unselected package btrfs-progs.
Preparing to unpack .../1-btrfs-progs_4.7-1_ppc64el.deb ...
Unpacking btrfs-progs (4.7-1) ...
Processing triggers for initramfs-tools (0.125ubuntu3) ...
update-initramfs: Generating /boot/initrd.img-4.8.0-11-generic
Segmentation fault

Oops output:
 [ 643.673740] Unable to handle kernel paging request for data at address 0x00000020
[ 643.674688] Faulting instruction address: 0xc000000000185040
[ 643.675418] Oops: Kernel access of bad area, sig: 11 [#1]
[ 643.676115] SMP NR_CPUS=2048 NUMA PowerNV
[ 643.676650] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp tun bridge stp llc kvm_hv kvm_pr kvm ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter evdev joydev at24 ghash_generic gf128mul vmx_crypto nvmem_core sg powernv_rng rng_core ip_tables x_tables autofs4 ext4 crc16 jbd2 fscrypto mbcache dm_mod sr_mod cdrom ses enclosure scsi_transport_sas sd_mod hid_generic usbhid hid uas usb_storage xhci_pci bnx2x ast xhci_hcd i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt usbcore fb_sys_fops drm tg3 aacraid ptp libphy pps_core ahci mdio usb_common libcrc32c libahci crc32c_generic crc32c_vpmsum
[ 643.686164] CPU: 1 PID: 7267 Comm: grep Not tainted 4.8.0-11-generic #12-Ubuntu
[ 643.687101] task: c000003c7edfd200 task.stack: c000003c82b08000
[ 643.687878] NIP: c000000000185040 LR: c000000000185054 CTR: c0000000004fd390
[ 643.688873] REGS: c000003c82b0b940 TRAP: 0300 Not tainted (4.8.0-11-generic)
[ 643.689851] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 88044828 XER: 20000000
[ 643.691001] CFAR: c0000000000087d0 DAR: 0000000000000020 DSISR: 40000000 SOFTE: 1
               GPR00: c000000000185054 c000003c82b0bbc0 c000000000f46700 0000000000000710
               GPR04: 0000000000010000 0000000000000001 ffff0a00ffffff04 d00000001d520723
               GPR08: c0000000004f6700 0000000000000704 c0000000004fd164 0000000000000001
               GPR12: 0000000028044828 c00000000fb80900 00000000289a0010 000000000000000a
               GPR16: ffffffffffffffff 0000000000000000 00000000289a0110 0000000000000000
               GPR20: 000001003d980000 0000000000010000 c000003c7bf63240 c000000002e8bb00
               GPR24: fffffffffffff000 c000003c82b0be00 c000003c82b0bc88 c0000000009a0d50
               GPR28: d00000001d432308 d00000001d432610 c000003c7bf63200 0000000000000000
[ 643.699385] NIP [c000000000185040] m_show+0xb0/0x260
[ 643.703211] LR [c000000000185054] m_show+0xc4/0x260
[ 643.721108] Call Trace:
[ 643.730239] [c000003c82b0bbc0] [c000000000185054] m_show+0xc4/0x260 (unreliable)
[ 643.756587] [c000003c82b0bc60] [c00000000034521c] seq_read+0x43c/0x550
[ 643.787204] [c000003c82b0bd00] [c0000000003a9ba0] proc_reg_read+0xb0/0x110
[ 643.804558] [c000003c82b0bd50] [c00000000030c03c] __vfs_read+0x6c/0xe0
[ 643.823169] [c000003c82b0bd90] [c00000000030d5bc] vfs_read+0xbc/0x1b0
[ 643.858380] [c000003c82b0bde0] [c00000000030f38c] SyS_read+0x6c/0x110
[ 643.893880] [c000003c82b0be30] [c0000000000095e0] system_call+0x38/0x108
[ 643.916214] Instruction dump:
[ 643.936521] 3884a648 7fc3f378 481c0961 60000000 ebfd0309 7fbdf840 419e0164 3f62ffa6
[ 643.988350] 3b7ba650 60000000 60000000 60420000 <e8bf0020> 7f64db78 7fc3f378 38a50018
[ 644.040907] ---[ end trace e452dce365a89415 ]---

[Leann Ogasawara (leannogasawara)]

Could you try upgrading to the newer 4.8.0-17.19 kernel that was promoted to the release pocket last night:

https://launchpad.net/ubuntu/+source/linux/4.8.0-17.19

Alternatively, you could retest with the latest image here that now contains this newer kernel as well:

http://cdimage.ubuntu.com/ubuntu-server/daily/20160927/

Please do let us know your results.

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-09-28 00:58 EDT-------
(In reply to comment #7)
> Could you try upgrading to the newer 4.8.0-17.19 kernel that was promoted to
> the release pocket last night:
>
> https://launchpad.net/ubuntu/+source/linux/4.8.0-17.19
>

Tested with latest kernel i.e. 4.8.0-17.19, not seeing OOPs or any other error messages.

root@pkvmhab010:~# update-initramfs -u
update-initramfs: Generating /boot/initrd.img-4.8.0-17-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast

root@pkvmhab010:~# apt install -y btrfs-progs/yakkety
Reading package lists... Done
Building dependency tree
Reading state information... Done
Selected version '4.7-1' (Ubuntu:16.10/yakkety [ppc64el]) for 'btrfs-progs'
The following NEW packages will be installed:
btrfs-progs
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/562 kB of archives.
After this operation, 5,656 kB of additional disk space will be used.
Selecting previously unselected package btrfs-progs.
(Reading database ... 130815 files and directories currently installed.)
Preparing to unpack .../btrfs-progs_4.7-1_ppc64el.deb ...
Unpacking btrfs-progs (4.7-1) ...
Processing triggers for initramfs-tools (0.125ubuntu3) ...
update-initramfs: Generating /boot/initrd.img-4.8.0-17-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
Processing triggers for libc-bin (2.24-0ubuntu1) ...
Setting up btrfs-progs (4.7-1) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for initramfs-tools (0.125ubuntu3) ...
update-initramfs: Generating /boot/initrd.img-4.8.0-17-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
Processing triggers for libc-bin (2.24-0ubuntu1) ...

[Andy Whitcroft (apw)]

Based on this testing feedback we will close this one Fix Released. Thank you for testing.