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Message #10196
[Bug 1648873] Re: Ubuntu 16.10 netboot install fails with "Oops: Exception in kernel mode, sig: 5 [#1] " (lpfc)
This bug was fixed in the package linux - 4.8.0-34.36
---------------
linux (4.8.0-34.36) yakkety; urgency=low
[ Luis Henriques ]
* Release Tracking Bug
- LP: #1651800
* Miscellaneous Ubuntu changes
- SAUCE: Do not build the xr-usb-serial driver for s390
linux (4.8.0-33.35) yakkety; urgency=low
[ Thadeu Lima de Souza Cascardo ]
* Release Tracking Bug
- LP: #1651721
[ Luis Henriques ]
* crypto : tolerate new crypto hardware for z Systems (LP: #1644557)
- s390/zcrypt: Introduce CEX6 toleration
* Several new Asus laptops are missing touchpad support (LP: #1650895)
- HID: asus: Add i2c touchpad support
* Acer, Inc ID 5986:055a is useless after 14.04.2 installed. (LP: #1433906)
- uvcvideo: uvc_scan_fallback() for webcams with broken chain
* cdc_ether fills kernel log (LP: #1626371)
- cdc_ether: Fix handling connection notification
* Kernel Fixes to get TCMU File Backed Optical to work (LP: #1646204)
- SAUCE: target/user: Fix use-after-free of tcmu_cmds if they are expired
* CVE-2016-9756
- KVM: x86: drop error recovery in em_jmp_far and em_ret_far
* On boot excessive number of kworker threads are running (LP: #1649905)
- slub: move synchronize_sched out of slab_mutex on shrink
* Ethernet not work after upgrade from kernel 3.19 to 4.4 [10ec:8168]
(LP: #1648279)
- ACPI / blacklist: Make Dell Latitude 3350 ethernet work
* Ubuntu 16.10 netboot install fails with "Oops: Exception in kernel mode,
sig: 5 [#1] " (lpfc) (LP: #1648873)
- scsi: lpfc: fix oops/BUG in lpfc_sli_ringtxcmpl_put()
* CVE-2016-9793
- net: avoid signed overflows for SO_{SND|RCV}BUFFORCE
* [Hyper-V] Kernel panic not functional on 32bit Ubuntu 14.10, 15.04, and
15.10 (LP: #1400319)
- Drivers: hv: avoid vfree() on crash
* d-i is missing usb support for platforms that use the xhci-platform driver
(LP: #1625222)
- d-i initrd needs additional usb modules to support the merlin platform
* overlayfs no longer supports nested overlayfs mounts, but there is a fix
upstream (LP: #1647007)
- ovl: fix d_real() for stacked fs
* Yakkety: arm64: CONFIG_ARM64_ERRATUM_845719 isn't enabled (LP: #1647793)
- [Config] CONFIG_ARM64_ERRATUM_845719=y
* Ubuntu16.10 - EEH on BELL3 adapter fails to recover (serial/tty)
(LP: #1646857)
- serial: 8250_pci: Detach low-level driver during PCI error recovery
* Driver for Exar USB UART (LP: #1645591)
- SAUCE: xr-usb-serial: Driver for Exar USB serial ports
- SAUCE: xr-usb-serial: interface for switching modes
- SAUCE: cdc-acm: Exclude Exar USB serial ports
* [Bug] (Purley) x86/hpet: Reduce HPET counter read contention (LP: #1645928)
- x86/hpet: Reduce HPET counter read contention
* Need Alps upstream their new touchpad driver (LP: #1571530)
- Input: ALPS - add touchstick support for SS5 hardware
- Input: ALPS - handle 0-pressure 1F events
- Input: ALPS - allow touchsticks to report pressure
- Input: ALPS - set DualPoint flag for 74 03 28 devices
* CONFIG_NR_CPUS=256 is too low (LP: #1579205)
- [Config] Increase the NR_CPUS to 512 for amd64 to support systems with a
large number of cores.
-- Luis Henriques <luis.henriques@xxxxxxxxxxxxx> Wed, 21 Dec 2016
16:20:08 +0000
** Changed in: linux (Ubuntu Yakkety)
Status: Fix Committed => Fix Released
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-9756
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-9793
--
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1648873
Title:
Ubuntu 16.10 netboot install fails with "Oops: Exception in kernel
mode, sig: 5 [#1] " (lpfc)
Status in debian-installer package in Ubuntu:
New
Status in linux package in Ubuntu:
Fix Released
Status in debian-installer source package in Xenial:
New
Status in linux source package in Xenial:
Invalid
Status in debian-installer source package in Yakkety:
New
Status in linux source package in Yakkety:
Fix Released
Bug description:
== Comment: #33 - Mauricio Faria De Oliveira - 2016-12-09 06:49:57 ==
Hi Canonical,
Can you please apply this patch [1] to 16.10 and 16.04.x HWE (4.8) ?
It's fixes a regression introduced in 4.8.
As you can see, it's in the SCSI maintainer (James Bottomley)'s
'fixes' branch, but didn't make 4.9-rc8 (maybe he considered it late
for this one).
We have installer, boot, and post-boot problems due to this one.
It'd be good if the netboot images for 16.04.x HWE kernel can get it too.
Thank you,
[1] scsi: lpfc: fix oops/BUG in lpfc_sli_ringtxcmpl_put()
http://git.kernel.org/cgit/linux/kernel/git/jejb/scsi.git/commit/?h=fixes&id=2319f847a8910cff1d46c9b66aa1dd7cc3e836a9
Historical context:
== Comment: #0 - HARSHA THYAGARAJA - 2016-11-21 02:39:35 ==
---Problem Description---
Ubuntu 16.10 netboot install fails with "Oops: Exception in kernel mode. " (kernel: 4.8.0-27)
Machine Type = Power8 baremetal
---boot type---
QEMU direct boot kernel/initrd
---Kernel cmdline used to launch install---
On a Power8 server, Using kernel and initrd images,
netcfg/disable_dhcp=true netcfg/confirm_static=true netcfg/choose_interface=98:BE:94:00:4C:68 netcfg/get_ipaddress=9.47.67.159/20 netcfg/get_gateway=9.47.79.254 netcfg/get_nameservers=
---Install repository type---
Internet repository
---Install repository Location---
http://ports.ubuntu.com/ubuntu-ports/dists/yakkety/main/installer-ppc64el/current/images/netboot/ubuntu-installer/ppc64el/
---Point of failure---
Other failure during installation (stage 1)
== Comment: #1 - HARSHA THYAGARAJA - 2016-11-21 02:41:54 ==
The netboot install fails and Call traces are seen at the Disk detection step.
== Comment: #8 - Mauricio Faria De Oliveira - 2016-11-21 15:58:25 ==
Finally got it.
The assembly offset/code + the trap signal is due to this BUG_ON(),
and the second condition triggered the trap.
Checking why piocb is not NULL but piocb->vport is NULL.
This might have happened in the lpfc_linkdown_port() path, in the stack trace.
Would need a more readable console log (ie, dmesg, as requested in
comments 5, 3) to help understanding it.
--
static int
lpfc_sli_ringtxcmpl_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
struct lpfc_iocbq *piocb)
{
lockdep_assert_held(&phba->hbalock);
BUG_ON(!piocb || !piocb->vport);
<...>
}
[ 226.147886] NIP [d00000000b7324c0]
lpfc_sli_ringtxcmpl_put+0x48/0x120 [lpfc]
0x2478 + 0x48 = 0x24c0 (tdnei; trap doubleword not equal immediate)
0000000000002478 <lpfc_sli_ringtxcmpl_put>:
<...>
2498: 78 2b bf 7c mr r31,r5 // r31 is *piocb (r5 is the 3rd function parameter)
249c: 78 1b 7d 7c mr r29,r3
24a0: 78 23 9e 7c mr r30,r4
24a4: 01 00 00 48 bl 24a4 <lpfc_sli_ringtxcmpl_put+0x2c> // probably converted at module load time to the call lockdep_assert_held()
24a8: 00 00 00 60 nop
24ac: 00 00 bf 2f cmpdi cr7,r31,0 // compare piocb with 0. checking for NULL.
24b0: 70 00 9e 41 beq cr7,2520 <lpfc_sli_ringtxcmpl_put+0xa8> // if equal to zero, branch out. done w/ the former part of the OR check.
24b4: e8 00 3f e9 ld r9,232(r31) // an offset of piocb. probably piocb->vport in the bug_on
24b8: 74 00 29 7d cntlzd r9,r9 // count leading zeroes. if r59 is null (0), leading zeroes is 64 (binary: 0100_0000, bit 6 is 1, and 6 LSbs [bits 5-0] are 0)
24bc: 82 d1 29 79 rldicl r9,r9,58,6 // rotate left 58 (ie, those 6 LSbs are now MSbs, and that bit 6 from 64 was rotated in the register and is now bit 0, the LSb), now AND the 6 MSbs w/ 0-bits, and the all lower bits with 1-bits (ie, save the LSb).
24c0: 00 00 09 0b tdnei r9,0 // trap if not equal to zero. (ie, the whole r9 was zero, with 64 leading/consecutive zeroes, then bit 6 is 1, it becomes bit 0.. and since bit 0 is now 1, r9 is thus non-zero, and the trap triggers.) this checked the latter part of the OR.
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