Re: [uml-devel] Re: [uml-user] Crash and stability problems with 2.6.15.3-bs2

[Blaisorblade <blaisorblade@yahoo.it>]

On Monday 27 February 2006 17:27, Anthony Brock wrote:
> Sorry for taking so long to get back on this. We've been busy with some
> other issues. Some comments are inline below in addition to the output
> from a new crash.

> In the mean time, we've experienced a second crash with the
> 2.6.15.1-bs1 kernel. It looks to be very similar to the previous crash.
> Only, in this case, I issued the command "uml_mconsole www-prod-1 sysrq
> s" in preparation for a backup (after issuing a "uml_mconsole $1 stop"
> command).

It's a particular scenario, and I've been doubtly about it, but indeed it 
seems that it's safe (at least by design).

> I am including the first dump below. The rest of the dump can 
> be found at:

> http://www.coherenthosting.com/prj/uml/miscellaneous/error.txt
>
> The time stamp at the top is in UTC, and specifies when the crash started.
>
> Tony

> -- time-stamp -- Feb/27/06 16:03:00 --
> SysRq : Emergency Sync
> events/0: page allocation failure. order:0, mode:0x20
0x20 == __GFP_HIGH == GFP_ATOMIC.

> 0829f510:  [<0808a1f3>] __alloc_pages+0x274/0x286
> 0829f550:  [<0808c7e5>] kmem_getpages+0x4a/0x9f
> 0829f564:  [<0808d2b4>] cache_grow+0x96/0x122
> 0829f598:  [<0808d493>] cache_alloc_refill+0x153/0x186
> 0829f5bc:  [<0808d62d>] kmem_cache_alloc+0x34/0x44
> 0829f5d0:  [<0808d134>] alloc_slabmgmt+0x20/0x45
> 0829f5e4:  [<0808d2cc>] cache_grow+0xae/0x122
> 0829f614:  [<0808d493>] cache_alloc_refill+0x153/0x186
> 0829f638:  [<0808d6dc>] __kmalloc+0x5b/0x6d
> 0829f654:  [<08171704>] __alloc_skb+0x52/0x129
> 0829f670:  [<0806097e>] uml_net_rx+0x1e/0x13c
> 0829f690:  [<08060ac0>] uml_net_interrupt+0x1f/0x91
> 0829f6d4:  [<0808595b>] handle_IRQ_event+0x24/0x54
> 0829f6f8:  [<080859de>] __do_IRQ+0x53/0x91
> 0829f70c:  [<08057bc8>] do_IRQ+0x20/0x2c
> 0829f714:  [<08057d5d>] sigio_handler+0xa5/0xcf
> 0829f72c:  [<0805e435>] sig_handler_common_skas+0xa5/0xbe
> 0829f750:  [<0806792e>] sig_handler+0xe/0x11
> 0829f860:  [<08057cdf>] sigio_handler+0x27/0xcf
> 0829f87c:  [<0805e435>] sig_handler_common_skas+0xa5/0xbe
> 0829f8a0:  [<0806792e>] sig_handler+0xe/0x11
> 0829f9e8:  [<0805a694>] set_signals+0xa4/0xc0
> 0829fa28:  [<0805a694>] set_signals+0xa4/0xc0
> 0829fa64:  [<0805a694>] set_signals+0xa4/0xc0
> 0829fa8c:  [<0805a694>] set_signals+0xa4/0xc0
> 0829fae0:  [<0805a641>] set_signals+0x51/0xc0
> 0829fb80:  [<081607e6>] handle_sysrq+0x1c/0x20
> 0829fb94:  [<0806258b>] mconsole_sysrq+0x5d/0x63
> 0829fbc0:  [<0806220f>] mconsole_stop+0x40/0x78
> 0829fbcc:  [<08061e1d>] mc_work_proc+0x38/0x4f
> 0829fbdc:  [<0807c175>] worker_thread+0x188/0x205
> 0829fbe4:  [<08061de5>] mc_work_proc+0x0/0x4f
> 0829fc08:  [<0806bde4>] default_wake_function+0x0/0x12
> 0829fc2c:  [<0807bfed>] worker_thread+0x0/0x205
> 0829fc30:  [<0807f21b>] kthread+0x74/0x9a

>
> Mem-info:
> DMA per-cpu:
> cpu 0 hot: low 0, high 18, batch 3 used:2
> cpu 0 cold: low 0, high 6, batch 1 used:5
> DMA32 per-cpu: empty
> Normal per-cpu: empty
> HighMem per-cpu: empty
> Free pages:         376kB (0kB HighMem)
> Active:2985 inactive:8684 dirty:4 writeback:0 unstable:0 free:94
> slab:3428 mapped:933 pagetables:48
> DMA free:376kB min:1024kB low:1280kB high:1536kB active:11940kB
> inactive:34736kB present:65536kB pages_scanned:0 all_unreclaimable?
> no
> lowmem_reserve[]: 0 0 0 0

There are 376kB of free pages, so it's strange that it can't satisfy this 
request.

[...]
> DMA: 0*4kB 1*8kB 1*16kB 1*32kB 1*64kB 0*128kB 1*256kB 0*512kB 0*1024kB
> 0*2048kB 0*4096kB = 376kB

> Swap cache: add 0, delete 0, find 0/0, race 0+0
> Free swap  = 655340kB
> Total swap = 655340kB
> Free swap:       655340kB
> 16384 pages of RAM

> 952 reserved pages
> 11194 pages shared
> 0 pages swap cached

-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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