Re: 2.6.13-rc2-almost-rc3, ext3 and memory corruption

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Petr Vandrovec wrote:

Hello,
  I was so happy that 2.6.13-rc3 was released that I tried to grab it,
and while I was doing that, box said:

Slab corruption: start=ffff8100005e5bf8, len=96
Redzone: 0x5a2cf071/0x5a2cf071.
Last user: [<ffffffff801ec42d>](journal_remove_journal_head+0x6d/0xb0)
000: 6b 6b 6b 6b 6b 6b 6b 6b 01 00 00 00 6b 6b 6b 6b
Prev obj: start=ffff8100005e5b80, len=96
Redzone: 0x5a2cf071/0x5a2cf071.
Last user: [<ffffffff801ec42d>](journal_remove_journal_head+0x6d/0xb0)
000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
Next obj: start=ffff8100005e5c70, len=96
Redzone: 0x5a2cf071/0x5a2cf071.
Last user: [<ffffffff801ec42d>](journal_remove_journal_head+0x6d/0xb0)
000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b


Hello,
so I've enabled JBD-DEBUG, and unfortunately somebody corrupted inode instead of journal head this time :-( But corruption looks same - somebody wrote 32bit value 1 somewhere it should not... Does anybody have something like CONFIG_DEBUG_PAGE_ALLOC for x86-64? 

Slab corruption: start=ffff8100005e7c00, len=976
Redzone: 0x5a2cf071/0x5a2cf071.
Last user: [<ffffffff801aa690>](destroy_inode+0x30/0x50)
080: 01 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
Prev obj: start=ffff8100005e7818, len=976
Redzone: 0x5a2cf071/0x5a2cf071.
Last user: [<ffffffff801aa690>](destroy_inode+0x30/0x50)
000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
ppc:~$ uname -a
Linux ppc 2.6.14-rc3-dd72 #1 SMP PREEMPT Tue Oct 4 21:12:16 CEST 2005 x86_64 GNU/Linux 
ppc:~$

This time I was not doing anything special, just building new kernel & browsing web.
						Thanks,
							Petr Vandrovec


Box in question has single Athlon64 processor, runs SMP PREEMPT kernel
with almost all debugging options set (but not CONFIG_JBD_DEBUG). Box has 2GB of ECC RAM. Root filesystem is on pata disk connected to the pata port on Promise's 20378 (using sata_promise). Disk with git repository is plugged to pata port on Via's VT8237. Kernel's configuration is at http://platan.vc.cvut.cz/vana_at_home_config.txt, dmesg at http://platan.vc.cvut.cz/vana_at_home_dmesg.txt. 


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