Locking fixes for sf(4)

John Baldwin jhb at FreeBSD.org
Fri Aug 12 13:36:49 GMT 2005


On Friday 12 August 2005 08:15 am, Christian Brueffer wrote:
> On Thu, Aug 11, 2005 at 11:24:10AM -0400, John Baldwin wrote:
> > On Thursday 11 August 2005 11:00 am, Christian Brueffer wrote:
> > > On Wed, Aug 10, 2005 at 04:58:09PM -0400, John Baldwin wrote:
> > > > I've fixed up the locking in sf(4) but do not have the hardware to
> > > > test the changes.  Can someone please test these patches?  Thanks.
> > > >
> > > > http://www.freebsd.org/~jhb/patches/sf_locking.patch
> > >
> > > Results in a "recursed on non-recursive mutex" panic.  Unfortunately
> > > the dump looks busted, I'll get a good one tomorrow (can also test the
> > > my(4) patch then).
> >
> > Ok.  If you could just get the backtrace from ddb that would probably be
> > sufficient.  Thanks for testing!
>
> panic: _mtx_lock_sleep: recursed on non-recursive mutex sf0 @
> /usr/home/build/src/sys/modules/sf/..
> /../pci/if_sf.c:477
>
> CPUID = 1
> KDB: enter: panic
> [thread pid 220 tid 100072 ]
> Stopped at      kdb_enter+0x30: leave
> db> tr
> Tracing pid 220 tid 100072 td 0xc1d63480
> kdb_enter(c079421b,1,c0793681,d8945ab4,c1d63480) at kdb_enter+0x30
> panic(c0793681,c1ad6ab0,c08ed18a,1dd,1dd) at panic+0x14e
> _mtx_lock_sleep(c1ac3c4c,c1d63480,0,c08ed18a,1dd) at _mtx_lock_sleep+0x47
> _mtx_lock_flags(c1ac3c4c,0,c08ed18a,1dd,0) at _mtx_lock_flags+0x9c
> sf_ifmedia_upd(c1adb800,1000,c08ed18a,4b7,c1ac3c4c) at sf_ifmedia_upd+0x3e
> sf_init_locked(c1ac3c4c,0,c08ed18a,4aa,c1adb800) at sf_init_locked+0x4bc
> sf_init(c1ac3c00,740,c07a8534,8020690c,c1ac3c00) at sf_init+0x39
> ether_ioctl(c1adb800,8020690c,c1d67e00,c05a7cd1,0) at ether_ioctl+0x67
> sf_ioctl(c1adb800,8020690c,c1d67e00,100,1) at sf_ioctl+0xbb
> in_ifinit(c1adb800,c1d67e00,c1cef3d0,0,1) at in_ifinit+0x208
> in_control(c1dfcde8,8040691a,c1cef3c0,c1adb800,c1d63480) at
> in_control+0x986 ifioctl(c1dfcde8,8040691a,c1cef3c0,c1d63480,2) at
> ifioctl+0x1cd
> soo_ioctl(c1d59d80,8040691a,c1cef3c0,c19dca80,c1d63480) at soo_ioctl+0x3ef
> ioctl(c1d63480,d8945d04,c,422,3) at ioctl+0x45d
> syscall(3b,3b,3b,80beac0,1) at syscall+0x2c0
> Xint0x80_syscall() at Xint0x80_syscall+0x1f
> --- syscall (54, FreeBSD ELF32, ioctl), eip = 0x8055473, esp = 0xbfbfe5fc,
> ebp = 0xbfbfee68 ---

Ah, ok, thanks.  This is the first driver I've seen that calls its 
ifmedia_update routine internally.  I'll fix this and update the patch.  
Thanks!

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org


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