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SubjectRe: 2.5.31 kmap_atomic copy_*_user benefits
William Lee Irwin III wrote:
> With and without kmap_atomic() -based copy_*_user() patches from akpm.
> Taken on a 16x/16GB box.

Have you seen any instability with these things applied? I seem to be
getting a fair amount of these BUG()s. But, I imagine that it could
be a race uncovered because of the serialization that highmem locks
caused.


kernel BUG at softirq.c:229!
invalid operand: 0000
CPU: 4
EIP: 0060:[<8011c8dd>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000 ebx: 80374f54 ecx: 8037e194 edx: ffffffff
esi: 00000000 edi: f7fba000 ebp: 80357560 esp: f7fbbf38
ds: 0068 es: 0068 ss: 0068
Stack: 00000001 80353960 fffffffe 00000080 8011c62a 80353960 00000000
8033b800
00000000 f7fbbf78 00000046 801092e1 f7fba000 80105334 00000000
802de388
00000000 80107d28 f7fba000 00000300 f7fba000 80105334 00000000
00000000
Call Trace: [<8011c62a>] [<801092e1>] [<80105334>] [<80107d28>]
[<80105334>]
[<8010535d>] [<801053b3>] [<801180fd>]
Code: 0f 0b e5 00 13 74 27 80 8b 43 10 50 8b 43 0c ff d0 83 c4 04


>>EIP; 8011c8dd <tasklet_hi_action+5d/c4> <=====

>>ebx; 80374f54 <bh_task_vec+14/280>
>>ecx; 8037e194 <tv1+14/804>
>>ebp; 80357560 <__bss_start+0/0>

Trace; 8011c62a <do_softirq+5a/ac>
Trace; 801092e1 <do_IRQ+f1/100>
Trace; 80105334 <poll_idle+0/48>
Trace; 80107d28 <common_interrupt+18/20>
Trace; 80105334 <poll_idle+0/48>
Trace; 8010535d <poll_idle+29/48>
Trace; 801053b3 <cpu_idle+37/48>
Trace; 801180fd <printk+125/140>

Code; 8011c8dd <tasklet_hi_action+5d/c4>
00000000 <_EIP>:
Code; 8011c8dd <tasklet_hi_action+5d/c4> <=====
0: 0f 0b ud2a <=====
Code; 8011c8df <tasklet_hi_action+5f/c4>
2: e5 00 in $0x0,%eax
Code; 8011c8e1 <tasklet_hi_action+61/c4>
4: 13 74 27 80 adc 0xffffff80(%edi,1),%esi
Code; 8011c8e5 <tasklet_hi_action+65/c4>
8: 8b 43 10 mov 0x10(%ebx),%eax
Code; 8011c8e8 <tasklet_hi_action+68/c4>
b: 50 push %eax
Code; 8011c8e9 <tasklet_hi_action+69/c4>
c: 8b 43 0c mov 0xc(%ebx),%eax
Code; 8011c8ec <tasklet_hi_action+6c/c4>
f: ff d0 call *%eax
Code; 8011c8ee <tasklet_hi_action+6e/c4>
11: 83 c4 04 add $0x4,%esp


--
Dave Hansen
haveblue@us.ibm.com

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