In efi_init() memory aligns in IA64_GRANULE_SIZE(16M). If set "crashkernel=1024M-:600M"
and use sparse memory model, when crash kernel booting it changes [128M-728M] to [128M-720M].
But initrd memory is in [709M-727M], and virt_addr_valid() *can not* check the invalid pages
when freeing initrd memory, because there are some pages missed at the end of the seciton,
and this causes error.
...
Unpacking initramfs...
Freeing initrd memory: 19648kB freed
BUG: Bad page state in process swapper pfn:02d00
page:e0000000102dd800 flags:(null) count:0 mapcount:1 mapping:(null) index:0
Call Trace:
[<a000000100018dc0>] show_stack+0x80/0xa0
sp=e000000021e8fbd0 bsp=e000000021e81360
[<a00000010090fcc0>] dump_stack+0x30/0x50
sp=e000000021e8fda0 bsp=e000000021e81348
[<a0000001001a3180>] bad_page+0x280/0x380
sp=e000000021e8fda0 bsp=e000000021e81308
[<a0000001001a8740>] free_hot_cold_page+0x3a0/0x5c0
sp=e000000021e8fda0 bsp=e000000021e812a0
[<a0000001001a8a50>] free_hot_page+0x30/0x60
sp=e000000021e8fda0 bsp=e000000021e81280
[<a0000001001a8b30>] __free_pages+0xb0/0xe0
sp=e000000021e8fda0 bsp=e000000021e81258
[<a0000001001a8c00>] free_pages+0xa0/0xc0
sp=e000000021e8fda0 bsp=e000000021e81230
[<a000000100bb40c0>] free_initrd_mem+0x230/0x290
sp=e000000021e8fda0 bsp=e000000021e811d8
[<a000000100ba6620>] populate_rootfs+0x1c0/0x280
sp=e000000021e8fdb0 bsp=e000000021e811a0
[<a00000010000ac30>] do_one_initcall+0x3b0/0x3e0
sp=e000000021e8fdb0 bsp=e000000021e81158
[<a000000100ba0a90>] kernel_init+0x3f0/0x4b0
sp=e000000021e8fdb0 bsp=e000000021e81108
[<a000000100016890>] kernel_thread_helper+0xd0/0x100
sp=e000000021e8fe30 bsp=e000000021e810e0
[<a00000010000a4c0>] start_kernel_thread+0x20/0x40
sp=e000000021e8fe30 bsp=e000000021e810e0
...
In "http://marc.info/?l=linux-arch&m=136147092429314&w=2"; Tony said:
"Perhaps in Documentation/kdump/kdump.txt (which the crashkernel entry
in kernel-parameters.txt points at). The ia64 section of kdump.txt
notes that the start address will be rounded up to a GRANULE boundary,
but doesn't talk about restrictions on the size."
This patch add size restriction to the documentation of kdump.
Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
---
Documentation/kdump/kdump.txt | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
index 13f1aa0..9c7fd98 100644
--- a/Documentation/kdump/kdump.txt
+++ b/Documentation/kdump/kdump.txt
@@ -297,6 +297,7 @@ Boot into System Kernel
On ia64, 256M@256M is a generous value that typically works.
The region may be automatically placed on ia64, see the
dump-capture kernel config option notes above.
+ If use sparse memory, the size should be rounded to GRANULE boundaries.
On s390x, typically use "crashkernel=xxM". The value of xx is dependent
on the memory consumption of the kdump system. In general this is not
--
1.7.6.1
--
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