Date: Wed, 02 Apr 2008 09:49:05 +0300 From: Alexander Shulikov <shulikov@i.ua> To: freebsd-ipfw@freebsd.org Subject: dummynet panics after 6.2 (kern/121955) Message-ID: <E1JgwmP-0004UL-Eo@web06.mi6.kiev.ua>
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--8323328-408138819-1207118945=:31340
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See bug: kern/121955
I have received panics with the same configuration of ipfw and dummynet in =
6.3, 7.0-RELEASE, 7.0-STABLE.
But I don't received it in 6.2.
In all panics was corrupted stack.
I use mpd-5.0 for pptp connections and shape traffic with ng_car or dummyne=
t for different clients.
In 7.0-STABLE on netgraph was added patches, that decreasing using stack by=
netgraph. And when I updated from 7.0-RELEASE to 7.0-STABLE, I received pa=
nic rare. Not after 3-5 minutes, but after minimum 3 hours, maximum 2,5 day=
s.
I saw cvsweb, and ip_dummynet in 6.2 and in 6.3.
Between it's two releases was done next changes:
Revision 1.93.2.6: download - view: text, markup, annotated - select for di=
ffs
Wed Mar 21 17:25:15 2007 UTC (12 months, 1 week ago) by oleg
Branches: RELENG_6
CVS tags: RELENG_6_3_BP, RELENG_6_3_0_RELEASE, RELENG_6_3
Diff to: previous 1.93.2.5: preferred, colored; branchpoint 1.93: preferred=
, colored; next MAIN 1.94: preferred, colored
Changes since revision 1.93.2.5: +481 -375 lines
MFC rev. 1.102-1.105
- style(9) cleanup
- Use separate thread for servicing dummynet(4).
Utilize taskqueue(9) API.
- Convert
net.inet.ip.dummynet.curr_time
net.inet.ip.dummynet.searches
net.inet.ip.dummynet.search_steps
to SYSCTL_LONG nodes. It will prevent frequent wrap around on 64bit archs.
- Implement simple mechanics for dummynet(4) internal time correction.
Under certain circumstances (system high load, dummynet lock contention, et=
c)
dummynet's tick counter can be significantly slower than it should be.
(I've observed up to 25% difference on one of my production servers).
Since this counter used for packet scheduling, it's accuracy is vital for
precise bandwidth limitation.
Introduce new sysctl nodes:
net.inet.ip.dummynet.
tick_lost - number of ticks coalesced by taskqueue thread.
tick_adjustment - number of time corrections done.
tick_diff - adjusted vs non-adjusted tick counter difference
tick_delta - last vs 'standard' tick differnece (usec).
tick_delta_sum - accumulated (and not corrected yet) time
difference (usec).
- Use non-recursive mutex. MTX_RECURSE is unnecessary since rev. 1.70
- Pay respect to net.isr.direct: use netisr_dispatch() instead of ip_input(=
)
- purge_flow_set():
Do not leak memory while purging queues which are not bound to pipe.
Diff between files see in file.
After this changes (that mfced from 1.102-1.105) system became working unst=
able.
I think, that it's changes must be rereaded, because panics on my server wi=
th 6.3 or 7.0, 7.0-STABLE don't repeated in 6.2 with same configuration.
Last panics was:
# kgdb /root/29.03.08/kernel.debug /var/crash/vmcore.11
kgdb: kvm_nlist(_stopped_cpus):
kgdb: kvm_nlist(_stoppcbs):
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:=
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you ar=
e
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
fault virtual address =3D 0xf2a9864
fault code =3D supervisor read, page not present
instruction pointer =3D 0x20:0xc3f96a9f
stack pointer =3D 0x28:0xe4614a88
frame pointer =3D 0x28:0xe4614b7c
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, def32 1, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 40 (dummynet)
trap number =3D 12
panic: page fault
Uptime: 3h55m10s
Physical memory: 1015 MB
Dumping 173 MB: 158 142 126 110 94 78 62 46 30 14
#0 doadump () at pcpu.h:195
195 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) bt
#0 doadump () at pcpu.h:195
#1 0xc056dbf3 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c:4=
09
#2 0xc056ddef in panic (fmt=3DVariable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3 0xc07bccac in trap_fatal (frame=3D0xe4614a48, eva=3D254449764) at /usr/=
src/sys/i386/i386/trap.c:899
#4 0xc07bcf10 in trap_pfault (frame=3D0xe4614a48, usermode=3D0, eva=3D2544=
49764) at /usr/src/sys/i386/i386/trap.c:812
#5 0xc07bd869 in trap (frame=3D0xe4614a48) at /usr/src/sys/i386/i386/trap.=
c:490
#6 0xc07a786b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7 0xc3f96a9f in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)
# kgdb /root/29.03.08/kernel.debug /var/crash/vmcore.10
kgdb: kvm_nlist(_stopped_cpus):
kgdb: kvm_nlist(_stoppcbs):
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:=
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you ar=
e
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
fault virtual address =3D 0xcd
fault code =3D supervisor read, page not present
instruction pointer =3D 0x20:0xc3f8ba9f
stack pointer =3D 0x28:0xe4614a88
frame pointer =3D 0x28:0xe4614b7c
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, def32 1, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 40 (dummynet)
trap number =3D 12
panic: page fault
Uptime: 3h21m49s
Physical memory: 1015 MB
Dumping 171 MB: 156 140 124 108 92 76 60 44 28 12
#0 doadump () at pcpu.h:195
195 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) bt
#0 doadump () at pcpu.h:195
#1 0xc056dbf3 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c:4=
09
#2 0xc056ddef in panic (fmt=3DVariable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3 0xc07bccac in trap_fatal (frame=3D0xe4614a48, eva=3D205) at /usr/src/sy=
s/i386/i386/trap.c:899
#4 0xc07bcf10 in trap_pfault (frame=3D0xe4614a48, usermode=3D0, eva=3D205)=
at /usr/src/sys/i386/i386/trap.c:812
#5 0xc07bd869 in trap (frame=3D0xe4614a48) at /usr/src/sys/i386/i386/trap.=
c:490
#6 0xc07a786b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7 0xc3f8ba9f in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)
# kgdb /root/29.03.08/kernel.debug /var/crash/vmcore.9
kgdb: kvm_nlist(_stopped_cpus):
kgdb: kvm_nlist(_stoppcbs):
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:=
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you ar=
e
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
fault virtual address =3D 0xf4
fault code =3D supervisor read, page not present
instruction pointer =3D 0x20:0xc3f8ca9f
stack pointer =3D 0x28:0xe4614a88
frame pointer =3D 0x28:0xe4614b7c
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, def32 1, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 40 (dummynet)
trap number =3D 12
panic: page fault
Uptime: 2d19h13m24s
Physical memory: 1015 MB
Dumping 199 MB: 184 168 152 136 120 104 88 72 56 40 24 8
#0 doadump () at pcpu.h:195
195 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) bt
#0 doadump () at pcpu.h:195
#1 0xc056dbf3 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c:4=
09
#2 0xc056ddef in panic (fmt=3DVariable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3 0xc07bccac in trap_fatal (frame=3D0xe4614a48, eva=3D244) at /usr/src/sy=
s/i386/i386/trap.c:899
#4 0xc07bcf10 in trap_pfault (frame=3D0xe4614a48, usermode=3D0, eva=3D244)=
at /usr/src/sys/i386/i386/trap.c:812
#5 0xc07bd869 in trap (frame=3D0xe4614a48) at /usr/src/sys/i386/i386/trap.=
c:490
#6 0xc07a786b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7 0xc3f8ca9f in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)
# kgdb /root/29.03.08/kernel.debug /var/crash/vmcore.8
kgdb: kvm_nlist(_stopped_cpus):
kgdb: kvm_nlist(_stoppcbs):
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:=
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you ar=
e
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
fault virtual address =3D 0xc2
fault code =3D supervisor read, page not present
instruction pointer =3D 0x20:0xc3f93a9f
stack pointer =3D 0x28:0xe4614a88
frame pointer =3D 0x28:0xe4614b7c
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, def32 1, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 40 (dummynet)
trap number =3D 12
panic: page fault
Uptime: 11h35m35s
Physical memory: 1015 MB
Dumping 217 MB: 202 186 170 154 138 122 106 90 74 58 42 26 10
#0 doadump () at pcpu.h:195
195 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) bt
#0 doadump () at pcpu.h:195
#1 0xc056dbf3 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c:4=
09
#2 0xc056ddef in panic (fmt=3DVariable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3 0xc07bccac in trap_fatal (frame=3D0xe4614a48, eva=3D194) at /usr/src/sy=
s/i386/i386/trap.c:899
#4 0xc07bcf10 in trap_pfault (frame=3D0xe4614a48, usermode=3D0, eva=3D194)=
at /usr/src/sys/i386/i386/trap.c:812
#5 0xc07bd869 in trap (frame=3D0xe4614a48) at /usr/src/sys/i386/i386/trap.=
c:490
#6 0xc07a786b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7 0xc3f93a9f in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)
# kgdb /root/29.03.08/kernel.debug /var/crash/vmcore.7
kgdb: kvm_nlist(_stopped_cpus):
kgdb: kvm_nlist(_stoppcbs):
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:=
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you ar=
e
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
fault virtual address =3D 0xef
fault code =3D supervisor read, page not present
instruction pointer =3D 0x20:0xc3f85a9f
stack pointer =3D 0x28:0xe4614a88
frame pointer =3D 0x28:0xe4614b7c
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, def32 1, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 40 (dummynet)
trap number =3D 12
panic: page fault
Uptime: 1d1h54m1s
Physical memory: 1015 MB
Dumping 227 MB: 212 196 180 164 148 132 116 100 84 68 52 36 20 4
#0 doadump () at pcpu.h:195
195 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) bt
#0 doadump () at pcpu.h:195
#1 0xc056dbf3 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c:4=
09
#2 0xc056ddef in panic (fmt=3DVariable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3 0xc07bccac in trap_fatal (frame=3D0xe4614a48, eva=3D239) at /usr/src/sy=
s/i386/i386/trap.c:899
#4 0xc07bcf10 in trap_pfault (frame=3D0xe4614a48, usermode=3D0, eva=3D239)=
at /usr/src/sys/i386/i386/trap.c:812
#5 0xc07bd869 in trap (frame=3D0xe4614a48) at /usr/src/sys/i386/i386/trap.=
c:490
#6 0xc07a786b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7 0xc3f85a9f in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)
My sysctl.conf:
# cat /etc/sysctl.conf
net.inet.ip.fw.autoinc_step=3D1
net.inet.ip.intr_queue_maxlen=3D256
net.inet.ip.dummynet.hash_size=3D16384
net.inet.ip.fw.dyn_buckets=3D1024
net.inet.ip.fastforwarding=3D1
kern.ipc.somaxconn=3D2048
kern.ipc.nmbclusters=3D32768
net.inet.tcp.recvspace=3D65536
net.inet.tcp.sendspace=3D131072
net.inet.ip.fw.one_pass=3D0
Between panic I try change variables:
net.inet.ip.fw.one_pass to 1, but panic repetated after this
My system now:
FreeBSD myhost.mydom 7.0-STABLE FreeBSD 7.0-STABLE #0: Wed Mar 26 07:56:32 =
EET 2008 root@myhost.mydom:/usr/obj/usr/src/sys/myhost i386
-- =F0=E5=EA=EB=E0=EC=E0 --------------------------------------------------=
---------
http://FREEhost.com.ua - =E4=EE=F1=F2=F3=EF=ED=FB=E9 =F5=EE=F1=F2=E8=ED=E3,=
=E4=EE=EC=E5=ED =E2 =EF=EE=E4=E0=F0=EE=EA
--8323328-408138819-1207118945=:31340
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