2.6.10 : kernel BUG at mm/rmap.c:483!

[Erik de Castro Lopo]

Hi all,

I'm running a kernel compiled from pristine 2.6.10 sources
downloaded from kernel.org on a P4 with HT. I was originally
working on an SMP/CONFIG_PREEMPT kernel when I first hit this
problem. I downgraded to an SMP kernel without CONFIG_PREEMPT 
the problem remained. Same problem on a kernel compiled for a 
single CPU. The dmesg output below is for the single CPU, no 
CONFIG_PREEMPT case.

The problem is triggered by a user space application which 
mmaps memory space on a custom PCI card via /dev/mem, reads 
some data and munmaps it. The program works perfectly on a 
2.4.26 kernel. On 2.6.10 I get this on the console:

------------[ cut here ]------------
kernel BUG at mm/rmap.c:483!
invalid operand: 0000 [#1]
Modules linked in:
CPU:    0
EIP:    0060:[<c013b5b6>]    Not tainted VLI
EFLAGS: 00010286   (2.6.10) 
EIP is at page_remove_rmap+0x26/0x40
eax: ffffffff   ebx: 00003000   ecx: b5e86000   edx: c1000060
esi: dabd9a24   edi: c1000060   ebp: 0017a000   esp: da40febc
ds: 007b   es: 007b   ss: 0068
Process counters-erikd (pid: 1622, threadinfo=da40e000 task=da9d6a60)
Stack: c0135a38 dfd0f878 00000002 f277a8c0 00000000 00003027 b5e86000 c049e480 
       b6286000 da43eb60 b6000000 c049e480 c0135b9b 0017a000 00000000 de16f030 
       dfc82000 b5e86000 da43eb60 b6286000 c049e480 c0135bfd 00400000 00000000 
Call Trace:
 [<c0135a38>] zap_pte_range+0x138/0x250
 [<c0135b9b>] zap_pmd_range+0x4b/0x70
 [<c0135bfd>] unmap_page_range+0x3d/0x70
 [<c0135d2e>] unmap_vmas+0xfe/0x1b0
 [<c013955a>] unmap_region+0x6a/0xd0
 [<c01397f4>] do_munmap+0xf4/0x130
 [<c0139870>] sys_munmap+0x40/0x70
 [<c01022f3>] syscall_call+0x7/0xb
Code: 90 8d 74 26 00 89 c2 8b 00 f6 c4 08 75 27 83 42 08 ff 0f 98 c0 84 c0 74 11 8b 42 08 40 78 0c 9c 58 fa ff 0d 50 65 4a c0 50 9d c3 <0f> 0b e3 01 41 2c 38 c0 eb ea 0f 0b e0 01 41 2c 38 c0 eb cf 8d 
 
Is there anything I have missed? Does /dev/mem on a 2.6
kerel behave the same way as on a 2.4 kernel?

I can supply more info if needed.

Regards,
Erik
-- 
-------------------------------------------------------
[N] Erik de Castro Lopo, Senior Computer Engineer
[E] erik.de.castro.lopo@xxxxxxxxxxxxxxxxxxx
[W] http://www.sensorynetworks.com
[T] +61 2 83022726
[F] +61 2 94750316
[A] L6/140 William St, East Sydney NSW 2011, Australia
-------------------------------------------------------
A good debugger is no substitute for a good test suite.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/