** Changed in: linux (Ubuntu)
Assignee: Chris J Arges (arges) => Stefan Bader (smb)
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https://bugs.launchpad.net/bugs/1421391
Title:
can't kdump in trusty ec2 instance
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
I can't get a crash dump in an ec2 trusty instance. When it kexecs, I
see the following backtrace:
[ 0.813826] ------------[ cut here ]------------
[ 0.817517] WARNING: CPU: 0 PID: 1 at
/build/buildd/linux-3.13.0/arch/x86/mm/ioremap.c:102
__ioremap_caller+0x374/0x380()
[ 0.823494] Modules linked in:
[ 0.825807] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0-44-generic
#73-Ubuntu
[ 0.829917] Hardware name: Xen HVM domU, BIOS 4.2.amazon 12/03/2014
[ 0.833266] 0000000000000009 ffff8800362f1c18 ffffffff81720d86
0000000000000000
[ 0.838861] ffff8800362f1c50 ffffffff810677cd ffffea0000ff0640
000000000003fc19
[ 0.844463] 000000003fc19000 000000000003fc19 0000000000001000
ffff8800362f1c60
[ 0.850005] Call Trace:
[ 0.851708] [<ffffffff81720d86>] dump_stack+0x45/0x56
[ 0.854563] [<ffffffff810677cd>] warn_slowpath_common+0x7d/0xa0
[ 0.857735] [<ffffffff810678aa>] warn_slowpath_null+0x1a/0x20
[ 0.860855] [<ffffffff81056ba4>] __ioremap_caller+0x374/0x380
[ 0.864047] [<ffffffff8104b528>] ? copy_oldmem_page+0x48/0xc0
[ 0.867193] [<ffffffff81056be4>] ioremap_cache+0x14/0x20
[ 0.870123] [<ffffffff8104b528>] copy_oldmem_page+0x48/0xc0
[ 0.873223] [<ffffffff81231fd4>] read_from_oldmem.part.0+0xa4/0xe0
[ 0.876534] [<ffffffff8123222b>] elfcorehdr_read_notes+0x1b/0x20
[ 0.879797] [<ffffffff81d66809>]
merge_note_headers_elf64.constprop.7+0x71/0x24a
[ 0.883949] [<ffffffff81d67188>] ? vmcore_init.part.4+0x55d/0x55d
[ 0.887380] [<ffffffff81d66dbd>] vmcore_init.part.4+0x192/0x55d
[ 0.890670] [<ffffffff81d67188>] ? vmcore_init.part.4+0x55d/0x55d
[ 0.894075] [<ffffffff81d671b9>] vmcore_init+0x31/0x33
[ 0.897022] [<ffffffff8100214a>] do_one_initcall+0xfa/0x1b0
[ 0.900121] [<ffffffff81089555>] ? parse_args+0x225/0x3f0
[ 0.903231] [<ffffffff81d360f6>] kernel_init_freeable+0x17b/0x200
[ 0.906683] [<ffffffff81d358e5>] ? do_early_param+0x88/0x88
[ 0.909814] [<ffffffff8170f250>] ? rest_init+0x80/0x80
[ 0.912777] [<ffffffff8170f25e>] kernel_init+0xe/0x130
[ 0.915648] [<ffffffff817317bc>] ret_from_fork+0x7c/0xb0
[ 0.918684] [<ffffffff8170f250>] ? rest_init+0x80/0x80
[ 0.921565] ---[ end trace 8b6e218b41648bbd ]---
[ Test Case ]
boot ec2 trusty instance
sudo apt-get install linux-crashdump
sudo sed -i 's/USE_KDUMP=0/USE_KDUMP=1/' /etc/default/kdump-tools
sudo reboot
sudo kdump-config show
echo c | sudo tee /proc/sysrq-trigger
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