Heiko Carstens wrote:
Actually I have a bug report that looks quite the same. Happens on s390x
with lots of I/O stress. But that is against vanilla 2.6.16-rc4 + additional
patches. I need to ask to reproduce that with a plain vanilla kernel, so
that a git bisect search might help to figure out what is wrong.
Unfortunately it seems to take hours before we hit the bug.
It is different because yours is coming from __alloc_pages, so if there
are no previous warnings then it means it wasn't corrupted before last
being freed, so it is a use-after-free bug. I'm surprised at how many
fields have been modified though (mapping, count, mapcount).
PG_error is set, which might mean it is a bug in an error handling path
that doesn't trigger very often.
<0>Bad page state in process 'blast'
<0>page:0000000000507d00 flags:0x000000060000002a mapping:00000000007570b0 mapcount:1 count:8
<0>Trying to fix it up, but a reboot is needed
<0>Backtrace:
<4>0000000006e93750 0000000000000000 0000000000773780 0700000000007c7a
<4> 0000000000000001 000000000025f878 000000000025f878 0000000000104840
<4> 0000000000000000 000000060000002a 0000000000000000 0000000000518d50
<4> 000000000000000c 0000000000000008 0000000006e936f8 0000000006e93770
<4> 000000000044e1f0 0000000000104840 0000000006e936f8 0000000006e93738
<4>Call Trace:
<4>([<0000000000104870>] dump_stack+0x2b8/0x374)
<4> [<00000000001a97de>] get_page_from_freelist+0x72e/0x8e8
<4> [<00000000001a9aa8>] __alloc_pages+0x110/0x324
<4> [<00000000001b37a0>] page_cache_readahead+0xf6c/0x11e4
<4> [<000000000019f870>] do_generic_mapping_read+0x150/0x828
<4> [<00000000001a07f4>] generic_file_aio_read+0x1f8/0x258
<4> [<00000000001fa844>] do_sync_read+0x130/0x1bc
<4> [<00000000001fc230>] sys_read+0x170/0x3b8
<4> [<000000000010fb20>] sysc_tracego+0xe/0x14
<4> [<0000020000043a84>] 0x20000043a84
Heiko
--
SUSE Labs, Novell Inc.
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