slabinfo: detect circular freelists #110
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We use a set to track the freelist, but we don't actually use it to check whether we've seen the object in the freelist. If an object gets double freed, we'll enter into an infinite loop. Check this and raise an error. Since we're already detecting invalid freelist pointers as one kind of error, let's add an exception class hierarchy to represent freelist errors, and then we can put this into the slabinfo directly. Then, we can format the information in a table at the end of the slabinfo. Signed-off-by: Stephen Brennan <[email protected]>
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We use a set to track the freelist, but we don't actually use it to check whether we've seen the object in the freelist. If an object gets double freed, we'll enter into an infinite loop.
Check this and raise an error. Since we're already detecting invalid freelist pointers as one kind of error, let's add an exception class hierarchy to represent freelist errors, and then we can put this into the slabinfo directly. Then, we can format the information in a table at the end of the slabinfo.