Comment 1 for bug 1664545

Leann,

This looks like an update for the Kernel team.

                     Michael

On 02/14/2017 04:09 AM, Launchpad Bug Tracker wrote:
> bugproxy (bugproxy) has assigned this bug to you for Ubuntu:
>
> In ubuntu17.04 as KVM guest on ubuntu KVM Host and trying kdump on guest
> while kdump process console got hung having call traces
>
>
> Reproducible Step:
>
> 1- Install Ubuntu17.04 as kvm guest on ubuntu kvm host
> 2- configure kdump
> 3- trigger kdump
>
> Expected Result :
>
> Kdump should capture
>
> Actual Result :
>
> Kdump console hung having continuous call traces
>
> LOG:
>
> [ 0.488534] Freeing unused kernel memory: 4416K (c000000008e80000 - c0000000092d0000)
> [ 0.488725] This architecture does not have kernel memory protection.
> Loading, please wait...
> starting version 232
> [ 0.501616] random: udevadm: uninitialized urandom read (16 bytes read)
> [ 0.501830] random: udevadm: uninitialized urandom read (16 bytes read)
> [ 0.501981] random: udevadm: uninitialized urandom read (16 bytes read)
> [ 0.502162] random: udevadm: uninitialized urandom read (16 bytes read)
> [ 0.502254] random: udevadm: uninitialized urandom read (16 bytes read)
> [ 0.502433] random: udevadm: uninitialized urandom read (16 bytes read)
> [ 0.503188] random: udevadm: uninitialized urandom read (16 bytes read)
> [ 0.503270] random: udevadm: uninitialized urandom read (16 bytes read)
> [ 0.503978] random: systemd-udevd: uninitialized urandom read (16 bytes read)
> [ 0.504218] random: systemd-udevd: uninitialized urandom read (16 bytes read)
> [ 242.663388] INFO: task systemd-udevd:151 blocked for more than 120 seconds.
> [ 242.663514] Not tainted 4.9.0-15-generic #16-Ubuntu
> [ 242.663553] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 242.663755] systemd-udevd D 0 151 145 0x00040002
> [ 242.663795] Call Trace:
> [ 242.663868] [c00000001fe4ecd0] [c00000000801c3a0] __switch_to+0x2e0/0x4c0
> [ 242.663964] [c00000001fe4ed30] [c000000008b19398] __schedule+0x2f8/0x990
> [ 242.664076] [c00000001fe4ee10] [c000000008b19a78] schedule+0x48/0xc0
> [ 242.664179] [c00000001fe4ee40] [c000000008b1de54] schedule_timeout+0x274/0x470
> [ 242.664334] [c00000001fe4ef30] [c000000008b19010] io_schedule_timeout+0xd0/0x160
> [ 242.664502] [c00000001fe4ef80] [c000000008b1a720] bit_wait_io+0x30/0x90
> [ 242.664618] [c00000001fe4efb0] [c000000008b1a168] __wait_on_bit+0xf8/0x170
> [ 242.664754] [c00000001fe4f000] [c00000000824b238] wait_on_page_bit+0x98/0xb0
> [ 242.664847] [c00000001fe4f060] [c00000000824d60c] do_read_cache_page+0x21c/0x4e0
> [ 242.665008] [c00000001fe4f0d0] [c00000000859be78] read_dev_sector+0xb8/0x140
> [ 242.665126] [c00000001fe4f100] [c0000000085a5d88] read_lba.isra.0+0x148/0x250
> [ 242.665259] [c00000001fe4f170] [c0000000085a652c] efi_partition+0x12c/0x830
> [ 242.665363] [c00000001fe4f2e0] [c00000000859e768] check_partition+0x158/0x2d0
> [ 242.665469] [c00000001fe4f360] [c00000000859c760] rescan_partitions+0xe0/0x390
> [ 242.665552] [c00000001fe4f430] [c000000008371828] __blkdev_get+0x358/0x490
> [ 242.665669] [c00000001fe4f4a0] [c000000008372b50] blkdev_get+0x1a0/0x4a0
> [ 242.665784] [c00000001fe4f550] [c000000008599538] device_add_disk+0x4a8/0x500
> [ 242.665894] [c00000001fe4f600] [d000000000511cc8] virtblk_probe+0x560/0x928 [virtio_blk]
> [ 242.665983] [c00000001fe4f6c0] [c000000008687700] virtio_dev_probe+0x1d0/0x350
> [ 242.666050] [c00000001fe4f700] [c000000008716f30] driver_probe_device+0x240/0x540
> [ 242.666116] [c00000001fe4f790] [c00000000871738c] __driver_attach+0x15c/0x160
> [ 242.666174] [c00000001fe4f810] [c0000000087138ec] bus_for_each_dev+0x8c/0xf0
> [ 242.666232] [c00000001fe4f860] [c0000000087162e4] driver_attach+0x34/0x50
> [ 242.666289] [c00000001fe4f880] [c000000008715a78] bus_add_driver+0x238/0x380
> [ 242.666345] [c00000001fe4f910] [c00000000871829c] driver_register+0x9c/0x180
> [ 242.666403] [c00000001fe4f980] [c000000008686abc] register_virtio_driver+0x4c/0x60
> [ 242.666470] [c00000001fe4f9a0] [d000000000512114] init+0x84/0xd4 [virtio_blk]
> [ 242.666527] [c00000001fe4fa10] [c00000000800dde8] do_one_initcall+0x68/0x1d0
> [ 242.666584] [c00000001fe4fad0] [c000000008b28e00] do_init_module+0x90/0x244
> [ 242.666643] [c00000001fe4fb60] [c000000008184794] load_module+0x1614/0x17a0
> [ 242.666701] [c00000001fe4fd30] [c000000008184c60] SyS_finit_module+0xf0/0x170
> [ 242.666759] [c00000001fe4fe30] [c00000000800bd84] system_call+0x38/0xe0
> ----------------------------------------------------------------------------------------------------
> ----------------------------------------------------------------------------------------------------
>
> [ 363.701100] md: raid6 personality registered for level 6
> [ 363.701169] md: raid5 personality registered for level 5
> [ 363.701200] md: raid4 personality registered for level 4
> [ 363.713493] md: raid10 personality registered for level 10
> done.
> Begin: Running /scripts/init-premount ... done.
> Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
> Begin: Running /scripts/local-premount ... done.
> [ 484.327414] INFO: task systemd-udevd:151 blocked for more than 120 seconds.
> [ 484.327505] Not tainted 4.9.0-15-generic #16-Ubuntu
> [ 484.327557] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 484.327648] systemd-udevd D 0 151 145 0x00040002
> [ 484.327704] Call Trace:
> [ 484.327741] [c00000001fe4ecd0] [c00000000801c3a0] __switch_to+0x2e0/0x4c0
> [ 484.327824] [c00000001fe4ed30] [c000000008b19398] __schedule+0x2f8/0x990
> [ 484.327907] [c00000001fe4ee10] [c000000008b19a78] schedule+0x48/0xc0
> [ 484.328015] [c00000001fe4ee40] [c000000008b1de54] schedule_timeout+0x274/0x470
> [ 484.328121] [c00000001fe4ef30] [c000000008b19010] io_schedule_timeout+0xd0/0x160
> [ 484.328222] [c00000001fe4ef80] [c000000008b1a720] bit_wait_io+0x30/0x90
> [ 484.328304] [c00000001fe4efb0] [c000000008b1a168] __wait_on_bit+0xf8/0x170
> [ 484.328386] [c00000001fe4f000] [c00000000824b238] wait_on_page_bit+0x98/0xb0
> [ 484.328470] [c00000001fe4f060] [c00000000824d60c] do_read_cache_page+0x21c/0x4e0
> [ 484.328566] [c00000001fe4f0d0] [c00000000859be78] read_dev_sector+0xb8/0x140
> [ 484.328648] [c00000001fe4f100] [c0000000085a5d88] read_lba.isra.0+0x148/0x250
> [ 484.328731] [c00000001fe4f170] [c0000000085a652c] efi_partition+0x12c/0x830
> [ 484.328812] [c00000001fe4f2e0] [c00000000859e768] check_partition+0x158/0x2d0
> [ 484.328919] [c00000001fe4f360] [c00000000859c760] rescan_partitions+0xe0/0x390
> [ 484.329017] [c00000001fe4f430] [c000000008371828] __blkdev_get+0x358/0x490
> [ 484.329099] [c00000001fe4f4a0] [c000000008372b50] blkdev_get+0x1a0/0x4a0
> [ 484.329181] [c00000001fe4f550] [c000000008599538] device_add_disk+0x4a8/0x500
> [ 484.329266] [c00000001fe4f600] [d000000000511cc8] virtblk_probe+0x560/0x928 [virtio_blk]
> [ 484.329361] [c00000001fe4f6c0] [c000000008687700] virtio_dev_probe+0x1d0/0x350
> [ 484.329458] [c00000001fe4f700] [c000000008716f30] driver_probe_device+0x240/0x540
> [ 484.329551] [c00000001fe4f790] [c00000000871738c] __driver_attach+0x15c/0x160
> [ 484.329634] [c00000001fe4f810] [c0000000087138ec] bus_for_each_dev+0x8c/0xf0
> [ 484.329715] [c00000001fe4f860] [c0000000087162e4] driver_attach+0x34/0x50
> [ 484.329796] [c00000001fe4f880] [c000000008715a78] bus_add_driver+0x238/0x380
> [ 484.329876] [c00000001fe4f910] [c00000000871829c] driver_register+0x9c/0x180
> [ 484.329957] [c00000001fe4f980] [c000000008686abc] register_virtio_driver+0x4c/0x60
> [ 484.330052] [c00000001fe4f9a0] [d000000000512114] init+0x84/0xd4 [virtio_blk]
> [ 484.330135] [c00000001fe4fa10] [c00000000800dde8] do_one_initcall+0x68/0x1d0
> [ 484.330215] [c00000001fe4fad0] [c000000008b28e00] do_init_module+0x90/0x244
> [ 484.330298] [c00000001fe4fb60] [c000000008184794] load_module+0x1614/0x17a0
> [ 484.330380] [c00000001fe4fd30] [c000000008184c60] SyS_finit_module+0xf0/0x170
> [ 484.330463] [c00000001fe4fe30] [c00000000800bd84] system_call+0x38/0xe0
>
> root@ubuntu:~# uname -a
> Linux ubuntu 4.9.0-15-generic #16-Ubuntu SMP Fri Jan 20 15:28:49 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
> root@ubuntu:~# cat /proc/cmdline
> BOOT_IMAGE=/boot/vmlinux-4.9.0-15-generic root=UUID=567520d7-270f-462e-9f0c-882c73bce0bc ro crashkernel=512M
> root@ubuntu:~#
> root@ubuntu:~# echo c > /proc/sysrq-trigger
>
> Regards
> Praveen
>
>
>> Resolution: Pass "noirqdistrib" to kdump kernel.
>>
>> Thanks
>
> wiki page at:
>
> https://wiki.ubuntu.com/ppc64el/Recommendations#Kdump_not_generating_crash_dump_file
>
> mirror this bug to Canonical for them to ensure "noirqdistrib" is
> passed in powerpc arch case..
>
> ** Affects: ubuntu
> Importance: Undecided
> Assignee: Taco Screen team (taco-screen-team)
> Status: New
>
>
> ** Tags: architecture-ppc64le bugnameltc-151351 severity-critical targetmilestone-inin1704

--
Michael Hohnbaum
OIL Program Manager
Power (ppc64el) Development Project Manager
Canonical, Ltd.