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Message #150904
[Bug 1440103] Re: [Hyper-V] Kernel panic not functional on Vivid
** Changed in: linux (Ubuntu)
Status: Fix Released => In Progress
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https://bugs.launchpad.net/bugs/1440103
Title:
[Hyper-V] Kernel panic not functional on Vivid
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Vivid:
In Progress
Status in linux source package in Wily:
Fix Released
Bug description:
Issue description:
Triggering a kernel panic will not produce a crash dump file.
Steps to Reproduce:
1. install kdump related packages.
2. verify crashmem value - defaults to 384M-:129M
3. verify that the system is ready for crash:
# cat /sys/kernel/kexec_crash_loaded
1
4. trigger kernel panic with # echo c | sudo tee /proc/sysrq-trigger
5. The system will freeze and no kernel dump will be generated, system is not rebooted automatically as configured in kdump-tools config.
Versions details:
Windows Server Host Edition: Microsoft Windows Server 2012 R2 Datacenter build 9600
Distribution name and release: Ubuntu Vivid Vervet
Kernel version: Linux ubuntu31 3.19.0-11-generic #11lp14233432v201504021617 SMP
Repro output with VM settings as follows:
2GB RAM, 1vCPU, crashmem: 384M:128M OR 384M:128M
[ 149.328829] SysRq : Trigger a crash
[ 149.342418] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 149.346369] IP: [<ffffffff814ae776>] sysrq_handle_crash+0x16/0x20
[ 149.346369] PGD 367a3067 PUD 7bdf0067 PMD 0
[ 149.346369] Oops: 0002 [#1] SMP
[ 149.346369] Modules linked in: joydev hid_generic hid_hyperv serio_raw hid 8250_fintek hyperv_keyboard hv_balloon hyp
erv_fb i2c_piix4 mac_hid autofs4 hv_netvsc hv_utils hv_storvsc psmouse floppy pata_acpi hv_vmbus
[ 149.346369] CPU: 0 PID: 1379 Comm: tee Not tainted 3.19.0-11-generic #11lp14233432v201504021617
[ 149.346369] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006 05/23/2012
[ 149.346369] task: ffff88007a7d3ae0 ti: ffff88007be7c000 task.ti: ffff88007be7c000
[ 149.346369] RIP: 0010:[<ffffffff814ae776>] [<ffffffff814ae776>] sysrq_handle_crash+0x16/0x20
[ 149.346369] RSP: 0018:ffff88007be7fe68 EFLAGS: 00010292
[ 149.346369] RAX: 000000000000000f RBX: 0000000000000063 RCX: 000000000000000f
[ 149.346369] RDX: ffff88007ce0fd78 RSI: ffff88007ce0e498 RDI: 0000000000000063
[ 149.346369] RBP: ffff88007be7fe68 R08: 0000000000000002 R09: 0000000000000275
[ 149.346369] R10: 0000000000000092 R11: 0000000000000275 R12: 0000000000000004
[ 149.346369] R13: 0000000000000000 R14: ffffffff81cb38e0 R15: 0000000000000008
[ 149.346369] FS: 00007f0a2e22a700(0000) GS:ffff88007ce00000(0000) knlGS:0000000000000000
[ 149.346369] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 149.346369] CR2: 0000000000000000 CR3: 0000000036047000 CR4: 00000000000006f0
[ 149.346369] Stack:
[ 149.346369] ffff88007be7fe98 ffffffff814aef96 0000000000000002 fffffffffffffffb
[ 149.346369] 00007ffc64e934b0 0000000000000002 ffff88007be7feb8 ffffffff814af443
[ 149.346369] 00007ffc64e934b0 ffff8800364f15c0 ffff88007be7fed8 ffffffff8125ad98
[ 149.346369] Call Trace:
[ 149.346369] [<ffffffff814aef96>] __handle_sysrq+0x106/0x170
[ 149.346369] [<ffffffff814af443>] write_sysrq_trigger+0x33/0x40
[ 149.346369] [<ffffffff8125ad98>] proc_reg_write+0x48/0x70
[ 149.346369] [<ffffffff811f33d7>] vfs_write+0xb7/0x1f0
[ 149.346369] [<ffffffff811f3ece>] ? vfs_read+0x11e/0x140
[ 149.346369] [<ffffffff811f3fe6>] SyS_write+0x46/0xb0
[ 149.346369] [<ffffffff817c924d>] system_call_fastpath+0x16/0x1b
[ 149.346369] Code: ef e8 df f7 ff ff eb d8 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 66 66 66 66 90 55 c7 05 34 42 a3 00
01 00 00 00 48 89 e5 0f ae f8 <c6> 04 25 00 00 00 00 01 5d c3 66 66 66 66 90 55 31 c0 48 89 e5
[ 149.346369] RIP [<ffffffff814ae776>] sysrq_handle_crash+0x16/0x20
[ 149.346369] RSP <ffff88007be7fe68>
[ 149.346369] CR2: 0000000000000000
[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Initializing cgroup subsys cpuacct
[ 0.000000] Linux version 3.19.0-11-generic (apw@gloin) (gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu12) ) #11lp14233432v
201504021617 SMP Thu Apr 2 15:15:51 UTC 2015 (Ubuntu 3.19.0-11.11lp14233432v201504021617-generic 3.19.3)
[ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.19.0-11-generic root=/dev/mapper/ubuntu31--vg-root ro console=tty0 co
nsole=ttyS1 irqpoll maxcpus=1 nousb systemd.unit=kdump-tools.service elfcorehdr=867700K
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