On Mon, 27 Apr 2009, Bart wrote: > After turning the suggested debuging options I've got tons of these when > trying to stress the tape device like before: > > Apr 27 16:57:30 fs kernel: [ 96.446708] slab error in verify_redzone_free(): > cache `size-128': memory outside object was overwritten > Apr 27 16:57:30 fs kernel: [ 96.446713] Pid: 0, comm: swapper Not tainted > 2.6.29.1-64 #2 > Apr 27 16:57:30 fs kernel: [ 96.446715] Call Trace: > Apr 27 16:57:30 fs kernel: [ 96.446717] <IRQ> [<ffffffff8029adc5>] > __slab_error+0x1f/0x25 > Apr 27 16:57:30 fs kernel: [ 96.446728] [<ffffffff8029b24b>] > cache_free_debugcheck+0x108/0x1d6 > Apr 27 16:57:30 fs kernel: [ 96.446731] [<ffffffff8029b473>] > kfree+0x81/0xc2 > Apr 27 16:57:30 fs kernel: [ 96.446735] [<ffffffff802bd311>] > bio_free_map_data+0xc/0x1e This appears to be kfree(bmd->iovecs) in bio_free_map_data(). It looks like the memcpy size in bio_set_map_data() overrides the kmalloc size; in other words, for a redzone error, bio->bi_vcnt > nr_pages in bio_copy_user_iov(). -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
