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Date: Tue, 05 Oct 2010 10:30:19 -0700 From: Ben Greear <greearb@...delatech.com> To: linux-kernel <linux-kernel@...r.kernel.org> Subject: Can SLUB debugging show back-trace for deletion point? I'm debugging a wireless issue that is apparently a write-after-free issue with skbs. Oct 5 09:50:18 localhost kernel: ============================================================================= Oct 5 09:50:18 localhost kernel: BUG kmalloc-8192: Poison overwritten Oct 5 09:50:18 localhost kernel: ----------------------------------------------------------------------------- Oct 5 09:50:18 localhost kernel: Oct 5 09:50:18 localhost kernel: INFO: 0xf5b18040-0xf5b1812f. First byte 0x80 instead of 0x6b Oct 5 09:50:18 localhost kernel: INFO: Allocated in ath_rxbuf_alloc+0x1d/0x74 [ath] age=54091 cpu=0 pid=613 Oct 5 09:50:18 localhost kernel: INFO: Freed in skb_release_data+0x8c/0x90 age=89 cpu=0 pid=4029 Oct 5 09:50:18 localhost kernel: INFO: Slab 0xc1fef300 objects=3 used=2 fp=0xf5b18000 flags=0x400040c1 Oct 5 09:50:18 localhost kernel: INFO: Object 0xf5b18000 @offset=0 fp=0x(null) .... I get a backtrace for the point at which this is detected, but it seems what would really be useful is a backtrace for where it was freed. Is there any way to get that information printed out by slub debugging? Thanks, Ben -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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