Panic with locks and networking as of a day ago
Sam Leffler
sam at errno.com
Fri Oct 31 21:42:25 PST 2003
On Friday 31 October 2003 07:49 pm, Doug Ambrisko wrote:
> I'm getting this panic a fair amount when dhclient is running on with the
> an(4) driver. My Atheros based card appears to have broke so I can't
> use that now (it doesn't work in Windows either). Here is the dmesg:
>
> lock order reversal
> 1st 0xc2ebaf08 vm object (vm object) @ vm/swap_pager.c:1319
> 2nd 0xc0735600 swap_pager swhash (swap_pager swhash) @
> vm/swap_pager.c:1835 3rd 0xc103565c vm object (vm object) @
> vm/uma_core.c:876
> Stack backtrace:
>
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x4
> fault code = supervisor read, page not present
> instruction pointer = 0x8:0xc0595952
> stack pointer = 0x10:0xd0135a40
> frame pointer = 0x10:0xd0135afc
> 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 = 854 (ssh)
> trap number = 12
> panic: page fault
>
> syncing disks, buffers remaining... panic: sleeping thread (pid 854) owns
> a mute x
> Uptime: 10m22s
> Dumping 255 MB
> 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
>
> and the trace is:
> kgdb) where
> #0 doadump () at ../../../kern/kern_shutdown.c:240
> #1 0xc050f61c in boot (howto=260) at ../../../kern/kern_shutdown.c:372
> #2 0xc050f9a7 in panic () at ../../../kern/kern_shutdown.c:550
> #3 0xc05057db in propagate_priority (td=0x0) at
> ../../../kern/kern_mutex.c:124 #4 0xc0505fe9 in _mtx_lock_sleep
> (m=0xc072a76c, opts=0,
> file=0xc06aa995 "../../../netinet/tcp_timer.c", line=489)
> at ../../../kern/kern_mutex.c:635
> #5 0xc0505a37 in _mtx_lock_flags (m=0xc072a76c, opts=0,
> file=0xc06aa995 "../../../netinet/tcp_timer.c", line=489)
> at ../../../kern/kern_mutex.c:333
> #6 0xc05a1f10 in tcp_timer_rexmt (xtp=0xc3116164)
> at ../../../netinet/tcp_timer.c:489
> #7 0xc051fea8 in softclock (dummy=0x0) at
> ../../../kern/kern_timeout.c:225 #8 0xc04fb802 in ithread_loop
> (arg=0xc16c1c80)
> at ../../../kern/kern_intr.c:540
> #9 0xc04fa804 in fork_exit (callout=0xc04fb670 <ithread_loop>, arg=0x0,
> frame=0x0) at ../../../kern/kern_fork.c:793
> (kgdb)
>
> I have the core so I can run other commands if needed.
>
This is new. Please contact me offline with a way to collect the kernel+core.
> BTW before that update to -current I was getting panics when I would
> insert or remove a card. Dhclient would end up being the process
> running and the kernel would crash in in_pcbconnect_setup when it did
> this check:
> if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
> The ro->ro_rt->rt_ifp would be pointing the the ifp that was gone
> and panic. This one wasn't to bad except for crashing during a suspend/
> resume sequence the other panic is happening randomly through the day.
>
I have a line on this one and should have a fix soon.
Sam
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