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Date:      Fri, 9 Apr 2010 13:13:07 -0700
From:      Pyun YongHyeon <pyunyh@gmail.com>
To:        Jack Vogel <jfvogel@gmail.com>
Cc:        freebsd-current@freebsd.org, Mike Tancsa <mike@sentex.net>
Subject:   Re: LOR on em in HEAD ( was Re: em driver regression
Message-ID:  <20100409201307.GF1085@michelle.cdnetworks.com>
In-Reply-To: <z2r2a41acea1004091209maca81e47td7f03d7c343b3ec9@mail.gmail.com>
References:  <201004081831.o38IVR3s043434@lava.sentex.ca> <20100408205626.GN5734@michelle.cdnetworks.com> <201004082105.o38L5DCH044187@lava.sentex.ca> <n2q2a41acea1004081406o969e7acbla0cef35f65f14f0a@mail.gmail.com> <20100408230750.GR5734@michelle.cdnetworks.com> <201004091317.o39DHFEl049965@lava.sentex.ca> <20100409164115.GB1085@michelle.cdnetworks.com> <g2u2a41acea1004090945p6f77ee30yeb9fbab9a8e43863@mail.gmail.com> <201004091900.o39J0b0k051687@lava.sentex.ca> <z2r2a41acea1004091209maca81e47td7f03d7c343b3ec9@mail.gmail.com>

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On Fri, Apr 09, 2010 at 12:09:24PM -0700, Jack Vogel wrote:
> Someone else also pointed this out. I'm dubious about its claim.

I can't reproduce the LOR with latest em(4)(r206429).

> This happens because there is an RX lock taken in rxeof, its held
> thru the call into the stack, it then encounters another lock there
> and hence this complaint. I've had the RX hold as it is for a long
> while and would rather not have to give it up, can someone look
> at it and advise?
> 
> Cheers,
> 
> Jack
> 
> 
> On Fri, Apr 9, 2010 at 12:00 PM, Mike Tancsa <mike@sentex.net> wrote:
> 
> > While testing an i5 box with HEAD checked out from this morning, bringing
> > up the second NIC generated this LOR on the console
> >
> > em1: link state changed to UP
> > lock order reversal:
> >  1st 0xc5dc7c10 em1:rx(1) (em1:rx(1)) @
> > /usr/HEAD/src/sys/modules/em/../../dev/e1000/if_em.c:4089
> >  2nd 0xc0f7e88c udp (udp) @ /usr/HEAD/src/sys/netinet/udp_usrreq.c:454
> > KDB: stack backtrace:
> > db_trace_self_wrapper(c0cb4d33,c5b72a70,c08e4d65,c08d50db,c0cb7d58,...) at
> > db_trace_self_wrapper+0x26
> > kdb_backtrace(c08d50db,c0cb7d58,c5d31a98,c5d2cb60,c5b72acc,...) at
> > kdb_backtrace+0x29
> > _witness_debugger(c0cb7d58,c0f7e88c,c0c9cf0b,c5d2cb60,c0cd04ca,...) at
> > _witness_debugger+0x25
> > witness_checkorder(c0f7e88c,1,c0cd04ca,1c6,0,...) at
> > witness_checkorder+0x839
> > _rw_rlock(c0f7e88c,c0cd04ca,1c6,c5d33088,c5e8be24,...) at _rw_rlock+0x9c
> > udp_input(c67faa00,14,0,c5e8bd80,c0dfa860,...) at udp_input+0x246
> > ip_input(c67faa00,c5f2f380,c5b72be8,c07463b6,c0dfa860,...) at
> > ip_input+0x606
> > netisr_dispatch_src(1,0,c67faa00,c5b72c20,c0954bc1,...) at
> > netisr_dispatch_src+0xcd
> > netisr_dispatch(1,c67faa00,c6018c00,c6018c00,c6852800,...) at
> > netisr_dispatch+0x20
> > ether_demux(c6018c00,c67faa00,3,0,3,...) at ether_demux+0x1a1
> > ether_input(c6018c00,c67faa00,c11a0e17,ff9,64,...) at ether_input+0x365
> > em_rxeof(c5e8bd80,109,c6016180,0,c5b72cc8,...) at em_rxeof+0x13c
> > em_msix_rx(c5dc7c00,c5b72cc8,c088eb14,c0e133c0,c60342b8,...) at
> > em_msix_rx+0x25
> > intr_event_execute_handlers(c5d807f8,c6034280,c0cacd7e,533,c60342f0,...) at
> > intr_event_execute_handlers+0x125
> > ithread_loop(c603b4a0,c5b72d38,c0cacaed,343,c5d807f8,...) at
> > ithread_loop+0x9f
> > fork_exit(c0877800,c603b4a0,c5b72d38) at fork_exit+0xb8
> > fork_trampoline() at fork_trampoline+0x8
> > --- trap 0, eip = 0, esp = 0xc5b72d70, ebp = 0 ---
> >
> > 0(i5b)# uname -a
> > FreeBSD i5b.sentex.ca 9.0-CURRENT FreeBSD 9.0-CURRENT #2: Fri Apr  9
> > 11:56:25 EDT 2010     mdtancsa@ich10.sentex.ca:/usr/HEAD/obj/usr/HEAD/src/sys/GENERIC
> >  i386
> > 0(i5b)#
> >
> > em0@pci0:0:25:0:        class=0x020000 card=0x34ec8086 chip=0x10ef8086
> > rev=0x05 hdr=0x00
> >    vendor     = 'Intel Corporation'
> >    class      = network
> >    subclass   = ethernet
> >    cap 01[c8] = powerspec 2  supports D0 D3  current D0
> >    cap 05[d0] = MSI supports 1 message, 64 bit enabled with 1 message
> >    cap 13[e0] = PCI Advanced Features: FLR TP
> > em1@pci0:3:0:0: class=0x020000 card=0x34ec8086 chip=0x10d38086 rev=0x00
> > hdr=0x00
> >    vendor     = 'Intel Corporation'
> >    device     = 'Intel 82574L Gigabit Ethernet Controller (82574L)'
> >    class      = network
> >    subclass   = ethernet
> >    cap 01[c8] = powerspec 2  supports D0 D3  current D0
> >    cap 05[d0] = MSI supports 1 message, 64 bit
> >    cap 10[e0] = PCI-Express 1 endpoint max data 128(256) link x1(x1)
> >    cap 11[a0] = MSI-X supports 5 messages in map 0x1c enabled
> >
> >
> > 0(i5b)#  vmstat -i
> > interrupt                          total       rate
> > irq4: uart0                         6156          3
> > irq8: rtc                         224879        127
> > irq21: ehci0                        2662          1
> > irq23: ehci1                        3674          2
> > cpu0: timer                      1754210        998
> > irq256: em0                        10778          6
> > irq257: em1                          331          0
> > irq258: em1                            4          0
> > irq260: em1                            4          0
> > irq261: em1                            8          0
> > irq262: ahci0                         69          0
> > cpu3: timer                      1753938        998
> > cpu2: timer                      1753932        998
> > cpu1: timer                      1753886        998
> > Total                            7264531       4134
> > 0(i5b)#
> >
> > CPU: Intel(R) Core(TM) i5 CPU         750  @ 2.67GHz (2666.65-MHz 686-class
> > CPU)
> >  Origin = "GenuineIntel"  Id = 0x106e5  Family = 6  Model = 1e  Stepping =
> > 5
> >
> >  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
> >
> >  Features2=0x98e3fd<SSE3,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT>
> >  AMD Features=0x28100000<NX,RDTSCP,LM>
> >  AMD Features2=0x1<LAHF>
> >  TSC: P-state invariant
> > real memory  = 4294967296 (4096 MB)
> > avail memory = 2577711104 (2458 MB)
> > ACPI APIC Table: <INTEL  S3420GPC>
> > FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
> >
> >
> >
> >
> > --------------------------------------------------------------------
> > Mike Tancsa,                                      tel +1 519 651 3400
> > Sentex Communications,                            mike@sentex.net
> > Providing Internet since 1994                    www.sentex.net
> > Cambridge, Ontario Canada                         www.sentex.net/mike
> >
> >



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