Re: 2.6.17-rc2-mm1

[Andrew Morton <akpm@osdl.org>]

"Martin J. Bligh" <mbligh@google.com> wrote:
>
> Andrew Morton wrote:
> > (I did s/linux-kernel@google.com/linux-kernel@vger.kernel.org/)
> > 
> > Martin Bligh <mbligh@google.com> wrote:
> > 
> >>Still crashes in LTP on x86_64:
> >>(introduced in previous release)
> >>
> >>http://test.kernel.org/abat/29674/debug/console.log
> > 
> > 
> > What a mess.  A doublefault inside an NMI watchdog timeout.  I think.  It's
> > hard to see.  Some CPUs are stuck on a CPU scheduler lock, others seem to
> > be stuck in flush_tlb_others.  One of these could be a consequence of the
> > other, or both could be a consequence of something else.
> 
> OK, well the latest one seems cleaner, on -rc3-mm1.
> http://test.kernel.org/abat/30007/debug/console.log
> 
> Just has the double fault, with no NMI watchdog timeouts. Not that
> it means any more to me, but still ;-) mtest01 seems to be able to
> reproduce this every time, but I don't have an appropriate box here
> to diagnose it with (this was a 4x Opteron inside IBM), and it's
> definitely something in -mm that's not in mainline.
> 
> M.
> 
> double fault: 0000 [1] SMP
> last sysfs file: /devices/pci0000:00/0000:00:06.0/resource
> CPU 0
> Modules linked in:
> Pid: 20519, comm: mtest01 Not tainted 2.6.17-rc3-mm1-autokern1 #1
> RIP: 0010:[<ffffffff8047c8b8>] <ffffffff8047c8b8>{__sched_text_start+1856}
> RSP: 0000:0000000000000000  EFLAGS: 00010082
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff805d9438
> RDX: ffff8100db12c0d0 RSI: ffffffff805d9438 RDI: ffff8100db12c0d0
> RBP: ffffffff805d9438 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: ffff8100e39bd440 R14: ffff810008003620 R15: 000002b02751726c
> FS:  0000000000000000(0000) GS:ffffffff805fa000(0063) knlGS:00000000f7dd0460
> CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
> CR2: fffffffffffffff8 CR3: 00000000da399000 CR4: 00000000000006e0
> Process mtest01 (pid: 20519, threadinfo ffff8100b1bb4000, task 
> ffff8100db12c0d0)
> Stack: ffffffff80579e20 ffff8100db12c0d0 0000000000000001 ffffffff80579f58
>         0000000000000000 ffffffff80579e78 ffffffff8020b0b2 ffffffff80579f58
>         0000000000000000 ffffffff80485520
> Call Trace: <#DF> <ffffffff8020b0b2>{show_registers+140}
>         <ffffffff8020b357>{__die+159} <ffffffff8020b3cc>{die+50}
>         <ffffffff8020bba6>{do_double_fault+115} 
> <ffffffff8020aa91>{double_fault+125}
>         <ffffffff8047c8b8>{__sched_text_start+1856} <EOE>
> 
> Code: e8 4c ba d8 ff 65 48 8b 34 25 00 00 00 00 4c 8b 46 08 f0 41
> RIP <ffffffff8047c8b8>{__sched_text_start+1856} RSP <0000000000000000>
>   -- 0:conmux-control -- time-stamp -- May/01/06  3:54:37 --

I was not able to reproduce this on the 4-way EMT64 machine.  Am a bit stuck.
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