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I've been compiling some custom kernels on a few machines, with very good results.
Now I've compiled one for an older computer. It's a ThinkCentre M50 from 2003. I have however added an additional 2048 MB of ram.
I've had some issues with the firmware, but managed to step over most of them. I've been running this exact hardware with the ARCH kernel for about of month, and never saw this.
Also, I recently updated the intel microcode for it's pentium 4. It hadn't been updated since it came out of the factory.
The computer still works, after about 100 of these messages, identical, they stop. And booting resumes as normal. The very first message says "swapper not tainted" instead, but otherwise shows most of the same data.
I will also include my kernel configuration as config.txt and config.bz2.
[ 0.000000] BUG: Bad page state in process swapper pfn:fff48008
[ 0.000000] page:f56ec140 count:0 mapcount:1 mapping: (null) index:0x0
[ 0.000000] flags: 0x0()
[ 0.000000] page dumped because: nonzero mapcount
[ 0.000000] Modules linked in:
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Tainted: G B 4.3.0-thinkcentre-g5062ecd-dirty #1
[ 0.000000] Hardware name: IBM 8187F1U/IBM, BIOS 2AKT35AUS 01/29/2004
[ 0.000000] 00000000 50ec1f84 c185df20 c137a06d f56ec140 c1187f38 c17c6304 c18662d8
[ 0.000000] fff48008 00000000 c17c9f52 f73ac003 00000000 c185df3c c1188204 f56ec140
[ 0.000000] 00000001 f73ac003 f56ec140 00000000 c185df6c c118c53c 00000001 000b7fff
[ 0.000000] Call Trace:
[ 0.000000] [<c137a06d>] ? dump_stack+0x3e/0x51
[ 0.000000] [<c1187f38>] ? bad_page+0xb8/0x110
[ 0.000000] [<c1188204>] ? free_pages_prepare+0x274/0x2b0
[ 0.000000] [<c118c53c>] ? free_hot_cold_page+0x2c/0x390
[ 0.000000] [<c118fd67>] ? free_highmem_page+0x47/0x50
[ 0.000000] [<c1905c5d>] ? add_highpages_with_active_regions+0xc5/0x11c
[ 0.000000] [<c19065f2>] ? set_highmem_pages_init+0x5e/0x67
[ 0.000000] [<c1906051>] ? mem_init+0x19/0x189
[ 0.000000] [<c18f193c>] ? start_kernel+0x1f9/0x413Offline