Messages in this thread | | | Date | Wed, 2 Nov 2005 20:05:02 +0530 | From | Dipankar Sarma <> | Subject | bad page state under possibly oom situation |
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We have discussed this in private previously and I had mentioned that I see this introduced between 2.6.9-rc1 and 2.6.9-rc2. After spending some time doing other things, I went back to take a look at this again and thought I would share this with a wider audience. The basic problem is that while running the LTP rename14 test with a tmpfs /tmp, I see this -
Bad page state at prep_new_page (in process 'rename14', page ffff810008002aa8) flags:0x4000000000000090 mapping:0000000000000000 mapcount:0 count:0 Backtrace:
Call Trace:<ffffffff80150388>{bad_page+115} <ffffffff80150bb1>{buffered_rmqueue+438} <ffffffff80150da8>{__alloc_pages+251} <ffffffff8022fb10>{_atomic_dec_and_lock+24} <ffffffff801535b3>{cache_alloc_refill+581} <ffffffff8015384f>{kmem_cache_alloc+44} <ffffffff8017cd55>{d_alloc+33} <ffffffff8017507e>{__lookup_hash+206} <ffffffff80176f4e>{sys_rename+245} <ffffffff8010e636>{system_call+126}
Trying to fix it up, but a reboot is needed
Recently, I tested this with 2.6.14 and it worked. I then tried setting rcupdate.maxbatch=10 as it was before 2.6.14 and the bad page state problem happened again. Looks like it happens only under memory pressure and likely have something to do with slab. I am wondering if that rings a bell with anyone. Manfred ?
Thanks Dipankar - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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