Date: Sat, 19 Jun 2010 19:58:23 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: Lawrence Stewart <lstewart@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: [CFT] SIFTR - Statistical Information For TCP Research: Uncle Lawrence needs YOU! Message-ID: <20100619195823.53a7baaa@r500.local> In-Reply-To: <4C1C3922.2050102@freebsd.org> References: <4C1492D0.6020704@freebsd.org> <4C1C3922.2050102@freebsd.org>
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Lawrence Stewart <lstewart@freebsd.org> wrote:
> On 06/13/10 18:12, Lawrence Stewart wrote:
> > The time has come to solicit some external testing for my SIFTR tool.
> > I'm hoping to commit it within a week or so unless problems are discove=
red.
> > I'm interested in all feedback and reports of success/failure, along
> > with details of the architecture tested and number of CPUs if you would
> > be so kind.
I got the following hand-transcribed panic maybe a second after
sysctl net.inet.siftr.enabled=3D1
Fatal trap 12: page fault while in kernel mode
cpuid =3D 1; apic id =3D 01
[...]
current process =3D 12 (swi4: clock)
[ thread pid 12 tid 100006 ]
Stopped at siftr_chkpkt+0xd0: addq $0x1,0x8(%r14)
db> where
Tracing pid 12 tid 100006 td 0xffffff00034037e0
siftr_chkpt() at siftr_chkpkt+0xd0
pfil_run_hooks() at pfil_run_hooks+0xb4
ip_output() at ip_output+0x382
tcp_output() tcp_output+0xa41
tcp_timer_rexmt() at tcp_timer_rexmt+0x251
softclock() at softclock+0x291
intr_event_execute_handlers() at intr_event_execute_handlers+0x66
ithread_loop at ithread_loop+0x8e
fork_exit() at fork_exit+0x112
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip =3D 0, rsp =3D 0xffffff800003ad30, rbp =3D 0 ---
This is from the third attempt, the second time I got a different
backtrace that also contained some *_iwn_* functions, the first
time I had X running, so I didn't get anything. Unfortunately
at that point the system seems to be too busted to dump core.
I'm using:
FreeBSD 9.0-CURRENT #99 r+b768fe1: Sat Jun 19 15:01:37 CEST 2010
fk@r500.local:/usr/obj/usr/src/sys/ZOEY amd64
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM)2 Duo CPU T5870 @ 2.00GHz (1995.01-MHz K8-class =
CPU)
Origin =3D "GenuineIntel" Id =3D 0x6fd Family =3D 6 Model =3D f Stepp=
ing =3D 13
Features=3D0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PG=
E,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=3D0xe39d<SSE3,DTES64,MON,DS_CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM>
AMD Features=3D0x20100800<SYSCALL,NX,LM>
AMD Features2=3D0x1<LAHF>
TSC: P-state invariant
real memory =3D 2147483648 (2048 MB)
avail memory =3D 1976610816 (1885 MB)
ACPI APIC Table: <LENOVO TP-7Y >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s)
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
ioapic0: Changing APIC ID to 1
ioapic0 <Version 2.0> irqs 0-23 on motherboard
I'm not using vanilla sources, but none of the modifications
should matter here.
I have powerd running and did not yet try without it.
The system has bge0 and iwn0, but bge0 is mainly down.
pf is compiled into the kernel, siftr is loaded as a module.
The panic seems to occur without logging a single packet first:
fk@r500 ~ $cat /var/log/siftr.log=20
enable_time_secs=3D1276966161 enable_time_usecs=3D945080 siftrve=
r=3D1.2.3 hz=3D100 tcp_rtt_scale=3D32 sysname=3DFreeBSD sysver=3D9=
00014 ipmode=3D4
enable_time_secs=3D1276966586 enable_time_usecs=3D314023 siftrve=
r=3D1.2.3 hz=3D100 tcp_rtt_scale=3D32 sysname=3DFreeBSD sysver=3D9=
00014 ipmode=3D4
I get the impression that this is reproducible, but only tried
three times (the last time with everything mounted read-only).
Fabian
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