Re: kernel panic in wireless-related sysctl walk

I'm not able to reproduce this at the moment.


-- 
Cheers,
Cy Schubert <Cy.Schubert_at_cschubert.com>
FreeBSD UNIX:  <cy_at_FreeBSD.org>   Web:  http://www.FreeBSD.org

	The need of the many outweighs the greed of the few.


In message <20190110164201.DFD951E1F_at_spqr.komquats.com>, Cy Schubert 
writes:
> --_E525281E-4037-9802-70D9-783B79B148EC_
> Content-Transfer-Encoding: quoted-printable
> Content-Type: text/plain; charset="us-ascii"
>
> I'll add a me too, though I haven't found the time to dig further, as no du=
> mp is produced nor a panic string printed.
>
> I currently have iwn and will try to reproduce at noon.
>
> ---
> Sent using a tiny phone keyboard.
> Apologies for any typos and autocorrect.
> Also, this old phone only supports top post. Apologies.
>
> Cy Schubert
> <Cy.Schubert_at_cschubert.com> or <cy_at_freebsd.org>
> The need of the many outweighs the greed of the few.
> ---
>
> -----Original Message-----
> From: Michael Zhilin
> Sent: 10/01/2019 08:00
> To: Michael Butler
> Cc: freebsd-current
> Subject: Re: kernel panic in wireless-related sysctl walk
>
> I'm not lucky to reproduce it even if i use iwn and "sysctl
> net.wlan.0.rate_stats"
> Problem is related to 802.11n, but all my networks are 11g.
>
> BR
>
> On Thu, Jan 10, 2019 at 6:53 PM Michael Zhilin <mizhka_at_gmail.com> wrote:
>
> > Hi,
> >
> > Is it possible to print out any local variables of frame #8?
> >
> > Thx!
> >
> > On Thu, Jan 10, 2019 at 6:31 PM Michael Butler <imb_at_protected-networks.ne=
> t>
> > wrote:
> >
> >> With 'device iwn' and all the related wireless bits compiled into a
> >> custom kernel for a laptop, executing 'sysctl -a' yields a kernel panic
> >> of the form ..
> >>
> >> Fatal trap 12: page fault while in kernel mode
> >> cpuid =3D 1; apic id =3D 01
> >> fault virtual address   =3D 0x8
> >> fault code              =3D supervisor read data, page not present
> >> instruction pointer     =3D 0x20:0xffffffff809bf22c
> >> stack pointer           =3D 0x28:0xfffffe0097fb7660
> >> frame pointer           =3D 0x28:0xfffffe0097fb7670
> >> code segment            =3D base 0x0, limit 0xfffff, type 0x1b
> >>                         =3D DPL 0, pres 1, long 1, def32 0, gran 1
> >> processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
> >> current process         =3D 11053 (sysctl)
> >> trap number             =3D 12
> >> panic: page fault
> >> cpuid =3D 1
> >> time =3D 1547129798
> >> Uptime: 3d10h27m14s
> >> Dumping 3840 out of 16258
> >> MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%
> >>
> >>  [ .. ]
> >>
> >> (kgdb) #0  doadump (textdump=3D<value optimized out>) at pcpu.h:230
> >> #1  0xffffffff808704eb in kern_reboot (howto=3D260)
> >>     at /usr/src/sys/kern/kern_shutdown.c:451
> >> #2  0xffffffff80870920 in vpanic (fmt=3D<value optimized out>,
> >>     ap=3D<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:877
> >> #3  0xffffffff80870753 in panic (fmt=3D<value optimized out>)
> >>     at /usr/src/sys/kern/kern_shutdown.c:804
> >> #4  0xffffffff80c63b5b in trap_fatal (frame=3D0xfffffe0097fb75a0, eva=3D=
> 8)
> >>     at /usr/src/sys/amd64/amd64/trap.c:929
> >> #5  0xffffffff80c63f10 in trap_pfault (frame=3D0xfffffe0097fb75a0,
> >> usermode=3D0)
> >>     at /usr/src/sys/amd64/amd64/trap.c:839
> >> #6  0xffffffff80c632be in trap (frame=3D0xfffffe0097fb75a0)
> >>     at /usr/src/sys/amd64/amd64/trap.c:441
> >> #7  0xffffffff80c40535 in calltrap ()
> >>     at /usr/src/sys/amd64/amd64/exception.S:232
> >> #8  0xffffffff809bf22c in amrr_node_stats (ni=3D0xfffffe008cf83000,
> >>     s=3D0xfffffe0097fb76f0) at /usr/src/sys/net80211/ieee80211_amrr.c:46=
> 4
> >> #9  0xffffffff809ef9f4 in ieee80211_ratectl_sysctl_stats_node_iter (
> >>     arg=3D0xfffffe0097fb76f0, ni=3D0xfffffe008cf83000) at
> >> ieee80211_ratectl.h:170
> >> #10 0xffffffff809e42b0 in ieee80211_iterate_nodes_vap (
> >>     nt=3D<value optimized out>, vap=3D<value optimized out>,
> >>     f=3D0xffffffff809ef9b0 <ieee80211_ratectl_sysctl_stats_node_iter>,
> >>     arg=3D0xfffffe0097fb76f0) at /usr/src/sys/net80211/ieee80211_node.c:=
> 2558
> >> #11 0xffffffff809ef941 in ieee80211_ratectl_sysctl_stats (
> >>     oidp=3D<value optimized out>, arg1=3D<value optimized out>,
> >>     arg2=3D<value optimized out>, req=3D<value optimized out>)
> >>     at /usr/src/sys/net80211/ieee80211_ratectl.c:99
> >> #12 0xffffffff8087f8ab in sysctl_root_handler_locked
> >> (oid=3D0xfffff80016697d00,
> >>     arg1=3D0xfffff80007bef000, arg2=3D0, req=3D0xfffffe0097fb7840,
> >>     tracker=3D0xfffffe0097fb77b8) at /usr/src/sys/kern/kern_sysctl.c:166
> >> #13 0xffffffff8087ef4f in sysctl_root (arg1=3D0xfffff80007bef000, arg2=
> =3D0,
> >>     req=3D0xfffffe0097fb7840) at /usr/src/sys/kern/kern_sysctl.c:2080
> >> #14 0xffffffff8087f5ca in userland_sysctl (td=3D0xfffff80007d96000,
> >>     name=3D0xfffffe0097fb7900, namelen=3D4, old=3D<value optimized out>,
> >>     oldlenp=3D<value optimized out>, inkernel=3D<value optimized out>,
> >> new=3D0x0,
> >>     newlen=3D0, retval=3D0xfffffe0097fb7968, flags=3D0)
> >>     at /usr/src/sys/kern/kern_sysctl.c:2175
> >> #15 0xffffffff8087f40f in sys___sysctl (td=3D0xfffff80007d96000,
> >>     uap=3D0xfffff80007d963c0) at /usr/src/sys/kern/kern_sysctl.c:2110
> >> #16 0xffffffff80c64742 in amd64_syscall (td=3D0xfffff80007d96000, traced=
> =3D0)
> >>     at subr_syscall.c:135
> >> #17 0xffffffff80c40e1d in fast_syscall_common ()
> >>     at /usr/src/sys/amd64/amd64/exception.S:504
> >>
> >> What other data should I capture to assist in identifying and resolving
> >> this?
> >>
> >>         imb
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> >>
> >
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