kmem_cache_alloc_one_tail BUG

- B
- Bill
  
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posted
18 years ago

Fri, May 20, 2005 9:48 PM

I am porting my Linux 2.4 code from an evaluation board with an MPC8275 processor and 8 Mbytes of flash, consisting of four Sharp LH28F016SCT-L95 flash chips, to a custom board with an MPC8270 processor and 8 Mbytes of flash, consisting of two Intel 28F320C3 flash chips. The custom board is crashing when mounting the JFFS2 filesystem. Specifically, with debugging on, in kmem_cache_alloc_one_tail, I reach the following BUG:

#if DEBUG if (cachep->flags & SLAB_POISON) if (kmem_check_poison_obj(cachep, objp)) BUG();

Anyone seen this before and solved this problem?

Thank you.

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- T
- Tommy Reynolds
  
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Vote on answer
posted
18 years ago

Sat, May 21, 2005 2:42 AM

If you look in "mm/slab.c" you'll find there are three ways to die of a poisoned slab cache:

POISON_INUSE - Using an uninitialized slab POISON_FREE - Use after free POISON_END - Store-past-end-byte

The OOPS traceback in "/var/log/messages" should help determine how you got here.

Cheers

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