[uml-devel] Soft lockup with 2.6.15+bs3-tls

[uml-devel] Soft lockup with 2.6.15+bs3-tls

[Thomas Petazzoni]

Hi,

[ Please Cc: me the replies, I'm not on the list. Thanks ! ]

While using 'gcc' under UML 2.6.15 patched with bs3-tls, no patch on
the host, I get the following soft lockup. The soft lockup is fully
reproducible, and always occurs while compiling a specific file of the
software I'm compiling under UML.

BUG: soft lockup detected on CPU#0!

EIP: 0073:[<080c7900>] CPU: 0 Not tainted ESP: 007b:bf61c31c EFLAGS:
00000206 Not tainted
EAX: 0000000f EBX: 00000001 ECX: 0000021d EDX: 411442dc
ESI: 411442d0 EDI: 00000000 EBP: bf61c338 DS: 007b ES: 007b
a164fb6c:  [<a0033502>] show_regs+0x1e2/0x1f0
a164fb9c:  [<a0066358>] softlockup_tick+0x88/0xa0
a164fbbc:  [<a004a036>] do_timer+0x46/0x100
a164fbd0:  [<a0017fa2>] um_timer+0x12/0x60
a164fbe0:  [<a00665ed>] handle_IRQ_event+0x3d/0x90
a164fc08:  [<a00666d2>] __do_IRQ+0x92/0x100
a164fc3c:  [<a0012064>] do_IRQ+0x24/0x30
a164fc48:  [<a0017ee0>] timer_irq+0x140/0x1a0
a164fc74:  [<a00182d3>] timer_handler+0x63/0x80
a164fc8c:  [<a001ff53>] user_signal+0x73/0x80
a164fca4:  [<a001f218>] userspace+0x1b8/0x380
a164fd08:  [<a001f646>] fork_handler+0xc6/0xe0
a164fd20:  [<ffffe420>] _etext+0x5fe2259e/0x0

oom-killer: gfp_mask=0x200d2, order=0
Mem-info:
DMA per-cpu:
cpu 0 hot: low 0, high 6, batch 1 used:0
cpu 0 cold: low 0, high 2, batch 1 used:1
DMA32 per-cpu: empty
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages:        1024kB (0kB HighMem)
Active:5845 inactive:43 dirty:0 writeback:41 unstable:0 free:256
slab:618 mapped:5844 pagetables:78 DMA free:1024kB min:724kB low:904kB
high:1084kB active:23380kB inactive:172kB present:32768kB
pages_scanned:3014 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0
DMA32 free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB
present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0
0 0 Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB
present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0
0 0 HighMem free:0kB min:128kB low:128kB high:128kB active:0kB
inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0 0 DMA: 76*4kB 0*8kB 1*16kB 0*32kB 1*64kB
1*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 1024kB DMA32:
empty Normal: empty HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap  = 0kB
Total swap = 0kB
Free swap:            0kB
8192 pages of RAM
0 pages of HIGHMEM
1261 reserved pages
92 pages shared
0 pages swap cached
Out of Memory: Killed process 935 (cc1).
gcc: Internal error: Killed (program cc1)
Please submit a full bug report.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
For Debian GNU/Linux specific bug reporting instructions,
see <URL:file:///usr/share/doc/gcc-3.3/README.Bugs>.

Sincerly,

Thomas
-- 
Thomas Petazzoni - thomas.petazzoni@enix.org
http://{thomas,sos,kos}.enix.org - http://www.toulibre.org
http://www.{livret,agenda}dulibre.org


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Re: [uml-devel] Soft lockup with 2.6.15+bs3-tls

[Jeff Dike]

On Wed, Mar 15, 2006 at 01:59:15PM +0100, Thomas Petazzoni wrote:
> While using 'gcc' under UML 2.6.15 patched with bs3-tls, no patch on
> the host, I get the following soft lockup. The soft lockup is fully
> reproducible, and always occurs while compiling a specific file of the
> software I'm compiling under UML.

Soft lockups are easy to reproduce with any heavy I/O load, but I
haven't figured out what is going on.  They are harmless, though.  If
you don't like the messages, you can just disable them in the config.

The OOM is more interesting.  Is that reproducable?

				Jeff


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Re: [uml-devel] Soft lockup with 2.6.15+bs3-tls

[Thomas Petazzoni]

Hi,

Thanks for your quick answer !

Le Wed, 15 Mar 2006 11:21:30 -0500,
Jeff Dike <jdike@addtoit.com> a écrit :

> Soft lockups are easy to reproduce with any heavy I/O load, but I
> haven't figured out what is going on.  They are harmless, though.  If
> you don't like the messages, you can just disable them in the config.

Ok.

> The OOM is more interesting.  Is that reproducable?

Yep. Fully. In fact, it's because I haven't given enough memory to
UML:

UML# cat /proc/meminfo | grep MemTotal
MemTotal:        27724 kB

With "mem=64M", it now works.

Sincerly,

Thomas
-- 
Thomas Petazzoni - thomas.petazzoni@enix.org
http://{thomas,sos,kos}.enix.org - http://www.toulibre.org
http://www.{livret,agenda}dulibre.org


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