Date: Sat, 24 Jan 2015 20:53:27 +0300 From: Dmitry Sivachenko <trtrmitya@gmail.com> To: Adrian Chadd <adrian@freebsd.org> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: network locks up with udp traffic Message-ID: <EAA00A09-DCA6-4ADF-8773-3C8A3609CCB6@gmail.com> In-Reply-To: <CAJ-Vmokf9cC_26jF5B99_CRpjOaLOQUpBqMCcyqHevfi3JfFdQ@mail.gmail.com> References: <5B08402C-67A7-49E7-ADF8-390C94DCF1D7@gmail.com> <CAJ-Vmo=v5S=cRM3QPo0mGiNS8OS8so=915vx6R1fhDaKWS6BhQ@mail.gmail.com> <FCEBED19-25A4-4D8E-8EE5-8B2B397702C5@gmail.com> <CAJ-Vmokf9cC_26jF5B99_CRpjOaLOQUpBqMCcyqHevfi3JfFdQ@mail.gmail.com>
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> On 24 =D1=8F=D0=BD=D0=B2. 2015 =D0=B3., at 20:29, Adrian Chadd = <adrian@freebsd.org> wrote: >=20 > Hi, >=20 > Can you compile your kernel with WITNESS and repeat this test? It > looks like it's stuck in some lock ordering thing between some UDP > paths and an inpcb lookup. >=20 > It should log in dmesg the first time a LOR occurs, regardless of > whether it actively causes a hang. Here is what I got in dmesg just before my net locked up: lock order reversal: 1st 0xffffffff80e79008 pcbinfohash (pcbinfohash) @ = /opt/WRK/src/sys/netinet6/udp6_usrreq.c:1202 2nd 0xffffffff80e78fb0 udp (udp) @ = /opt/WRK/src/sys/netinet6/in6_pcb.c:614 lock order reversal: 1st 0xffffffff80e79008 pcbinfohash (pcbinfohash) @ = /opt/WRK/src/sys/netinet6/udp6_usrreq.c:1202 2nd 0xffffffff80e78d58 tcp (tcp) @ = /opt/WRK/src/sys/netinet6/in6_pcb.c:614 lock order reversal: 1st 0xffffffff80e79008 pcbinfohash (pcbinfohash) @ = /opt/WRK/src/sys/netinet6/udp6_usrreq.c:1202 2nd 0xffffffff80e781c0 rip (rip) @ = /opt/WRK/src/sys/netinet6/in6_pcb.c:614 When I was saving this dmesg output to disk, I got another LOR: lock order reversal: 1st 0xfffffe0baf12fd78 bufwait (bufwait) @ = /opt/WRK/src/sys/kern/vfs_bio.c:3065 2nd 0xfffff80011416c00 dirhash (dirhash) @ = /opt/WRK/src/sys/ufs/ufs/ufs_dirhash.c:284 Please tell me if I can provide more information to help tracking this = down. Thanks!=
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