The following reply was made to PR kern/183835; it has been noted by GNATS.
From: =?ISO-2022-JP?B?GyRCPi5MbjQyQDgbKEI=?= <hiroo....@gmail.com>
To: bug-follo...@freebsd.org, ela...@infohell.net
Cc:
Subject: Re: kern/183835: Kernel panic with VIMAGE on insertion of axe USB
network interface
Date: Wed, 22 Jan 2014 17:15:09 +0900
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Hello,
I have encountered the same problem
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 01
fault virtual address = 0x18
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc0a166d1
stack pointer = 0x28:0xf0527c18
frame pointer = 0x28:0xf0527c3c
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 15 (axe0)
[ thread pid 15 tid 100098 ]
Stopped at 0xc0a166d1 = if_alloc+0xd1: movl 0x18(%eax),%eax
db> bt
Tracing pid 15 tid 100098 td 0xc0c13c40
if_alloc(6,c6bd5580,0,cb,0,...) at 0xc0a166d1 = if_alloc+0xd1/frame 0xf0527c3c
ue_attach_post_task(c6bd54ac,20,c0e05d52,73,0,...) at 0xc713814e =
ue_attach_post_task+0x8e/frame 0xf0527c94
usb_process(c6bd5420,f0527d08,28219a3f,281eaa20,28223508,...) at
0xc07fc4c1 = usb_process+0x131/frame 0xf0527cc4
fork_exit(c07fc390,c6bd5420,f0527d08) at 0xc091fcc3 =
fork_exit+0xa3/frame 0xf0527cf4
fork_trampoline() at 0xc0ce78c4 = fork_trampoline+0x8/frame 0xf0527cf4
it seems the page fault occurs at sys/net/if.c line 280 in
ifindex_alloc_locked,
when accessing V_if_index.
looking at if_var.h and vnet.h, V_if_index will be
1) when VIMAGE is not defined,
V_if_index => VNET(if_index) => (if_index)
2) when VIMAGE is defined,
V_if_index => VNET(if_index)
=> VNET_VNET(curvnet, if_index)
=> (*VNET_VNET_PTR((curvnet), if_index))
=> _VNET_PTR((curvnet)->vnet_data_base, if_index)
=> (__typeof(VNET_NAME(if_index))*) (((curvnet)->vnet_data_base) +
(uintptr_t)&VNET_NAME(if_index))
=> (__typeof(vnet_entry_if_index)*) (((curvnet)->vnet_data_base) +
(uintptr_t)&vnet_entry_if_index)
and something is wrong in 2). I have not detailed further.
--001a11339e2e30630504f08ab9f3
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Hello,<br><br>I have encountered the same problem<br><br><pre style=3D"colo=
r:rgb(0,0,0);font-style:normal;font-variant:normal;font-weight:normal;lette=
r-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-t=
ransform:none;word-spacing:0px;word-wrap:break-word;white-space:pre-wrap">
Fatal trap 12: page fault while in kernel mode
cpuid =3D 0; apic id =3D 01
fault virtual address =3D 0x18
fault code =3D supervisor read, page not present
instruction pointer =3D 0x20:0xc0a166d1
stack pointer =3D 0x28:0xf0527c18
frame pointer =3D 0x28:0xf0527c3c
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 15 (axe0)
[ thread pid 15 tid 100098 ]
Stopped at 0xc0a166d1 =3D if_alloc+0xd1: movl 0x18(%eax),%eax
db> bt
Tracing pid 15 tid 100098 td 0xc0c13c40
if_alloc(6,c6bd5580,0,cb,0,...) at 0xc0a166d1 =3D if_alloc+0xd1/frame 0xf05=
27c3c
ue_attach_post_task(c6bd54ac,20,c0e05d52,73,0,...) at 0xc713814e =3D ue_att=
ach_post_task+0x8e/frame 0xf0527c94
usb_process(c6bd5420,f0527d08,28219a3f,281eaa20,28223508,...) at 0xc07fc4c1=
=3D usb_process+0x131/frame 0xf0527cc4
fork_exit(c07fc390,c6bd5420,f0527d08) at 0xc091fcc3 =3D fork_exit+0xa3/fram=
e 0xf0527cf4
fork_trampoline() at 0xc0ce78c4 =3D fork_trampoline+0x8/frame 0xf0527cf4<br=
><br>it seems the page fault occurs at sys/net/if.c line 280 in ifindex_all=
oc_locked,<br>when accessing V_if_index.<br><br>looking at if_var.h and vne=
t.h, V_if_index will be<br>
<br>1) when VIMAGE is not defined,<br> V_if_index =3D> VNET(if_index) =
=3D> (if_index)<br><br>2) when VIMAGE is defined,<br> V_if_index =3D>=
VNET(if_index)<br> =A0=3D> VNET_VNET(curvnet, if_index)<br> =A0=3D> =
(*VNET_VNET_PTR((curvnet), if_index))<br>
=3D> _VNET_PTR((curvnet)->vnet_data_base, if_index)<br> =3D> (_=
_typeof(VNET_NAME(if_index))*) (((curvnet)->vnet_data_base) + (uintptr_t=
)&VNET_NAME(if_index))<br> =3D> (__typeof(vnet_entry_if_index)*) ((=
(curvnet)->vnet_data_base) + (uintptr_t)&vnet_entry_if_index)<br>
<br>and something is wrong in 2). I have not detailed further.<br></pre>
--001a11339e2e30630504f08ab9f3--
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