kernel panic in wireless-related sysctl walk

Thu Jan 10 16:42:15 UTC 2019

I'll add a me too, though I haven't found the time to dig further, as no dump is produced nor a panic string printed.

I currently have iwn and will try to reproduce at noon.

---
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Cy Schubert
<Cy.Schubert at cschubert.com> or <cy at freebsd.org>
The need of the many outweighs the greed of the few.
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-----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.net>
> 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 = 1; apic id = 01
>> fault virtual address   = 0x8
>> fault code              = supervisor read data, page not present
>> instruction pointer     = 0x20:0xffffffff809bf22c
>> stack pointer           = 0x28:0xfffffe0097fb7660
>> frame pointer           = 0x28:0xfffffe0097fb7670
>> code segment            = base 0x0, limit 0xfffff, type 0x1b
>>                         = DPL 0, pres 1, long 1, def32 0, gran 1
>> processor eflags        = interrupt enabled, resume, IOPL = 0
>> current process         = 11053 (sysctl)
>> trap number             = 12
>> panic: page fault
>> cpuid = 1
>> time = 1547129798
>> Uptime: 3d10h27m14s
>> Dumping 3840 out of 16258
>> MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%
>>
>>  [ .. ]
>>
>> (kgdb) #0  doadump (textdump=<value optimized out>) at pcpu.h:230
>> #1  0xffffffff808704eb in kern_reboot (howto=260)
>>     at /usr/src/sys/kern/kern_shutdown.c:451
>> #2  0xffffffff80870920 in vpanic (fmt=<value optimized out>,
>>     ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:877
>> #3  0xffffffff80870753 in panic (fmt=<value optimized out>)
>>     at /usr/src/sys/kern/kern_shutdown.c:804
>> #4  0xffffffff80c63b5b in trap_fatal (frame=0xfffffe0097fb75a0, eva=8)
>>     at /usr/src/sys/amd64/amd64/trap.c:929
>> #5  0xffffffff80c63f10 in trap_pfault (frame=0xfffffe0097fb75a0,
>> usermode=0)
>>     at /usr/src/sys/amd64/amd64/trap.c:839
>> #6  0xffffffff80c632be in trap (frame=0xfffffe0097fb75a0)
>>     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=0xfffffe008cf83000,
>>     s=0xfffffe0097fb76f0) at /usr/src/sys/net80211/ieee80211_amrr.c:464
>> #9  0xffffffff809ef9f4 in ieee80211_ratectl_sysctl_stats_node_iter (
>>     arg=0xfffffe0097fb76f0, ni=0xfffffe008cf83000) at
>> ieee80211_ratectl.h:170
>> #10 0xffffffff809e42b0 in ieee80211_iterate_nodes_vap (
>>     nt=<value optimized out>, vap=<value optimized out>,
>>     f=0xffffffff809ef9b0 <ieee80211_ratectl_sysctl_stats_node_iter>,
>>     arg=0xfffffe0097fb76f0) at /usr/src/sys/net80211/ieee80211_node.c:2558
>> #11 0xffffffff809ef941 in ieee80211_ratectl_sysctl_stats (
>>     oidp=<value optimized out>, arg1=<value optimized out>,
>>     arg2=<value optimized out>, req=<value optimized out>)
>>     at /usr/src/sys/net80211/ieee80211_ratectl.c:99
>> #12 0xffffffff8087f8ab in sysctl_root_handler_locked
>> (oid=0xfffff80016697d00,
>>     arg1=0xfffff80007bef000, arg2=0, req=0xfffffe0097fb7840,
>>     tracker=0xfffffe0097fb77b8) at /usr/src/sys/kern/kern_sysctl.c:166
>> #13 0xffffffff8087ef4f in sysctl_root (arg1=0xfffff80007bef000, arg2=0,
>>     req=0xfffffe0097fb7840) at /usr/src/sys/kern/kern_sysctl.c:2080
>> #14 0xffffffff8087f5ca in userland_sysctl (td=0xfffff80007d96000,
>>     name=0xfffffe0097fb7900, namelen=4, old=<value optimized out>,
>>     oldlenp=<value optimized out>, inkernel=<value optimized out>,
>> new=0x0,
>>     newlen=0, retval=0xfffffe0097fb7968, flags=0)
>>     at /usr/src/sys/kern/kern_sysctl.c:2175
>> #15 0xffffffff8087f40f in sys___sysctl (td=0xfffff80007d96000,
>>     uap=0xfffff80007d963c0) at /usr/src/sys/kern/kern_sysctl.c:2110
>> #16 0xffffffff80c64742 in amd64_syscall (td=0xfffff80007d96000, traced=0)
>>     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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