UDP LOR with the latest RELENG_7

Vlad GALU dudu at dudu.ro
Sun Oct 12 12:08:33 PDT 2008

On Sun, Oct 12, 2008 at 1:40 PM, Robert Watson <rwatson at freebsd.org> wrote:
> On Fri, 10 Oct 2008, Robert Watson wrote:
>> On Fri, 10 Oct 2008, Jeremy Chadwick wrote:
>>>>  I'll see whether the system still locks up or not though..
>>> Okay, I'm bringing rwatson@ into the thread since this is specific to
>>> UDP.
>> I've now fixed the bug leading to the lock order reversal; I'd be
>> interested in knowing if it also corrects the stability issue.  This was
>> r183753 in svn; I'm not sure it's hit CVS/cvsup yet but should do in a few
>> minutes.
> Dear Vlad:
> Could you confirm that with udp_usrreq.c: (or newer), the problem
> has gone away?  CVS log excerpt below.

 Hello Robert & all,
 Yes, the LOR seems to have gone away now, even with
 However, I started seeing another one:

-- cut here --
lock order reversal:
 1st 0xffffffff805a62a0 pf task mtx (pf task mtx) @
 2nd 0xffffff00011e3cf0 radix node head (radix node head) @
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
witness_checkorder() at witness_checkorder+0x565
_mtx_lock_flags() at _mtx_lock_flags+0x2f
rtalloc1_fib() at rtalloc1_fib+0x85
rtalloc_ign_fib() at rtalloc_ign_fib+0xaa
pf_calc_mss() at pf_calc_mss+0x89
pf_test_tcp() at pf_test_tcp+0xce2
pf_test() at pf_test+0xcdb
pf_check_in() at pf_check_in+0x2b
pfil_run_hooks() at pfil_run_hooks+0xac
ip_input() at ip_input+0x2dd
ether_demux() at ether_demux+0x1b4
ether_input() at ether_input+0x1c6
bge_intr() at bge_intr+0x3d0
ithread_loop() at ithread_loop+0xe9
fork_exit() at fork_exit+0x110
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffffffa044dd30, rbp = 0 ---
-- and here --

   This one looks somewhat familiar (from the top of my head), but
it's probably a subject for another thread :)

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