Date: Mon, 10 Dec 2012 15:18:45 -0800 From: mdf@FreeBSD.org To: Adrian Chadd <adrian@freebsd.org>, Garrett Cooper <yanegomi@gmail.com> Cc: freebsd-net@freebsd.org, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: "Memory modified after free" - by whom? Message-ID: <CAMBSHm96ZEiF4mOhUyk-aDS%2BGs%2BhDsh_dMsd-WFcmZ%2BSm6Zk%2BA@mail.gmail.com> In-Reply-To: <CAJ-Vmo=MsSV3DhAVEP36d%2BFccHDdQz7%2By7v5xTjYKyBP0PfQoQ@mail.gmail.com> References: <CAGH67wQKUDLQmL8cnWwgzQpWAN2OhKLu0AemPNuy7EOC-i1p9g@mail.gmail.com> <CAJ-Vmo=MsSV3DhAVEP36d%2BFccHDdQz7%2By7v5xTjYKyBP0PfQoQ@mail.gmail.com>
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On Mon, Dec 10, 2012 at 3:10 PM, Adrian Chadd <adrian@freebsd.org> wrote: > 9216 sounds like a jumbo frame mbuf. So the NIC is writing to an mbuf > after it's finalised/freed. > > I have a similar bug showing up on ath(4) RX. :( Compile with DEBUG_MEMGUARD in the kernel configuration, and then set vm.memguard.desc to the name of the UMA zone used for the 9216 byte allocations, mbuf_jumbo_9k. This should cause a panic when the memory is touched after free. Cheers, matthew > On 10 December 2012 14:22, Garrett Cooper <yanegomi@gmail.com> wrote: >> I noticed this while checking the logs on one of my test boxes >> after restarting the network. Any idea where I should start looking >> into this (has IPv6 enabled but wasn't using it, em/cxgbe/ixgbe >> interfaces with the ixgbe interfaces lagged previously, but now not)? >> It looks suspiciously like the same size as a jumbo frame, but I'm not >> 100% sure if that's the real problem. >> Thanks, >> -Garrett >> >> Dec 10 14:03:12 wf158 kernel: em0: link state changed to DOWN >> Dec 10 14:03:13 wf158 kernel: ix0: link state changed to DOWN >> Dec 10 14:03:13 wf158 kernel: ix0: link state changed to UP >> Dec 10 14:03:13 wf158 kernel: ix1: link state changed to DOWN >> Dec 10 14:03:13 wf158 kernel: ix1: link state changed to UP >> Dec 10 14:03:13 wf158 kernel: ix0: link state changed to DOWN >> Dec 10 14:03:13 wf158 kernel: ix0: link state changed to UP >> Dec 10 14:03:15 wf158 kernel: em0: link state changed to UP >> Dec 10 14:03:15 wf158 dhclient: New IP Address (em0): 10.7.169.89 >> Dec 10 14:03:15 wf158 dhclient: New Subnet Mask (em0): 255.255.240.0 >> Dec 10 14:03:15 wf158 dhclient: New Broadcast Address (em0): 10.7.175.255 >> Dec 10 14:03:15 wf158 dhclient: New Routers (em0): 10.7.160.1 >> Dec 10 14:03:16 wf158 kernel: ix0: link state changed to DOWN >> Dec 10 14:03:16 wf158 kernel: ix0: link state changed to UP >> Dec 10 14:03:31 wf158 kernel: in6_purgeaddr: err=65, destination >> address delete failed >> Dec 10 14:03:31 wf158 dhclient[4539]: My address (10.7.169.89) was >> deleted, dhclient exiting >> Dec 10 14:03:32 wf158 dhclient[4521]: short write: wanted 20 got 0 bytes >> Dec 10 14:03:32 wf158 dhclient[4521]: exiting. >> Dec 10 14:03:33 wf158 kernel: em0: link state changed to DOWN >> Dec 10 14:03:33 wf158 kernel: ix1: link state changed to DOWN >> Dec 10 14:03:34 wf158 kernel: ix1: link state changed to UP >> Dec 10 14:03:34 wf158 kernel: ix1: link state changed to DOWN >> Dec 10 14:03:34 wf158 kernel: ix1: link state changed to UP >> Dec 10 14:03:34 wf158 kernel: ix0: link state changed to DOWN >> Dec 10 14:03:34 wf158 kernel: ix0: link state changed to UP >> Dec 10 14:03:34 wf158 kernel: ix1: link state changed to DOWN >> Dec 10 14:03:34 wf158 kernel: ix1: link state changed to UP >> Dec 10 14:03:36 wf158 kernel: em0: link state changed to UP >> Dec 10 14:03:36 wf158 dhclient: New IP Address (em0): 10.7.169.89 >> Dec 10 14:03:36 wf158 dhclient: New Subnet Mask (em0): 255.255.240.0 >> Dec 10 14:03:36 wf158 dhclient: New Broadcast Address (em0): 10.7.175.255 >> Dec 10 14:03:36 wf158 dhclient: New Routers (em0): 10.7.160.1 >> Dec 10 14:05:34 wf158 kernel: Memory modified after free >> 0xffffff81c016d000(9216) val=ffffffff @ 0xffffff81c016d000 >> Dec 10 14:05:35 wf158 kernel: Memory modified after free >> 0xffffff81b5cdc000(9216) val=ffffffff @ 0xffffff81b5cdc000 >> >> # uname -a >> FreeBSD wf158.west.isilon.com 10.0-CURRENT FreeBSD 10.0-CURRENT #1 >> r+2760369-dirty: Mon Dec 10 08:04:46 PST 2012 >> root@wf158.west.isilon.com:/usr/obj/usr/src/sys/ISI-GENERIC amd64 >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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