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Date:      Sun, 29 Sep 2013 00:30:38 +0300
From:      Konstantin Belousov <kostikbel@gmail.com>
To:        jfv@freebsd.org
Cc:        net@freebsd.org
Subject:   igb(4) panic: already enqueue
Message-ID:  <20130928213038.GT41229@kib.kiev.ua>

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On a relatively old test machine, dual-socket X7DWU supermicro, Xeon
X5272, with on-board 82575EB igb controllers, running the stress2
udp blast test immediately causes the following

panic: buf=3D0xfffff8001aa5c800 already enqueue at 1445 prod=3D1315 cons=3D=
1445
cpuid =3D 3
KDB: stack backtrace:
db_trace_self_wrapper() at 0xffffffff802839ab =3D db_trace_self_wrapper+0x2=
b/frame 0xfffffe0123570600
vpanic() at 0xffffffff8033bd96 =3D vpanic+0x126/frame 0xfffffe0123570640
panic() at 0xffffffff8033be23 =3D panic+0x43/frame 0xfffffe01235706a0
igb_mq_start() at 0xffffffff80bcb228 =3D igb_mq_start+0xb8/frame 0xfffffe01=
23570710  =20
ether_output() at 0xffffffff804072a8 =3D ether_output+0x5c8/frame 0xfffffe0=
123570780 =20
ip_output() at 0xffffffff80430be1 =3D ip_output+0xe91/frame 0xfffffe0123570=
860
udp_send() at 0xffffffff804a5fc4 =3D udp_send+0x834/frame 0xfffffe0123570910
sosend_dgram() at 0xffffffff803b517b =3D sosend_dgram+0x36b/frame 0xfffffe0=
123570990 =20
soo_write() at 0xffffffff8039dbb9 =3D soo_write+0x49/frame 0xfffffe01235709=
d0
dofilewrite() at 0xffffffff803956c5 =3D dofilewrite+0x85/frame 0xfffffe0123=
570a20
kern_writev() at 0xffffffff803953d5 =3D kern_writev+0x65/frame 0xfffffe0123=
570a70
sys_write() at 0xffffffff80395363 =3D sys_write+0x63/frame 0xfffffe0123570a=
c0
amd64_syscall() at 0xffffffff8053ae7d =3D amd64_syscall+0x28d/frame 0xfffff=
e0123570bf0

Test is available at
svn:base/user/pho/stress2/testcases/udp, invocation line is
BLASTHOST=3D192.168.5.1 ./udp -t 10m -i 50 -h -v
Substitute the BLASTHOST with the ip address of a scratch box.

This is on the yesterday HEAD.  Could you, please, fix this ?

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