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SubjectRe: kernel BUG at mm/prio_tree.c:377
Rajesh, I applied your patch and it definitely seems to have halped.  The
server lasted nearly three days. :-) In fact, it didn't really seem to
hard lock but I had to reset it to get things working after the latest
crash.

Details:


kernel BUG at kernel/exit.c:842!
invalid operand: 0000 [#1]
SMP
Modules linked in: sch_tbf(U) ppp_async(U) crc_ccitt(U) ppp_mppe(U) ppp_generic(U) slhc(U) ipt_limit(U) ipt_REJECT(U) ipt_multiport(U) iptable_filter(U) iptable_nat(U) ip_conntrack(U) ip_tables(U) sunrpc(U) e100(U) mii(U) sg(U) scsi_mod(U) microcode(U) dm_mod(U) ohci_hcd(U) button(U) battery(U) ac(U) ext3(U) jbd(U)
CPU: 2
EIP: 0060:[<02121d10>] Tainted: P VLI
EFLAGS: 00010246 (2.6.9-1.1_FC2custom)
EIP is at do_exit+0x3b3/0x3bd
eax: 00000000 ebx: 26506560 ecx: 26506000 edx: 0381dd60
esi: 41fec340 edi: 26506030 ebp: 00001000 esp: 23b82f98
ds: 007b es: 007b ss: 0068
Process pppd (pid: 27091, threadinfo=23b82000 task=26506030)
Stack: 0d611e00 00001000 23b82000 23b82000 02121e05 00001000 23b82fc4 00000010
f6f32684 23b82000 fffec200 00000010 00000000 00000000 00000010 f6f32684
fef87938 000000fc 0000007b 0000007b 000000fc f6fa37a2 00000073 00000246
Call Trace:
[<02121e05>] sys_exit_group+0x0/0xd
Code: c1 e0 07 8d 04 10 ff 88 00 01 00 00 83 3a 02 75 0b 8b 82 08 11 00 00 e8 d8 95 ff ff 89 6f 7c 89 f8 e8 88 f5 ff ff e8 bc 74 19 00 <0f> 0b 4a 03 96 09 2d 02 eb fe 53 85 c0 89 d3 74 05 e8 35 ab ff
<1>Unable to handle kernel NULL pointer dereference at virtual address 00000024
printing eip:
0211ddb0
*pde = 00004001
Oops: 0000 [#2]
SMP
Modules linked in: sch_tbf(U) ppp_async(U) crc_ccitt(U) ppp_mppe(U) ppp_generic(U) slhc(U) ipt_limit(U) ipt_REJECT(U) ipt_multiport(U) iptable_filter(U) iptable_nat(U) ip_conntrack(U) ip_tables(U) sunrpc(U) e100(U) mii(U) sg(U) scsi_mod(U) microcode(U) dm_mod(U) ohci_hcd(U) button(U) battery(U) ac(U) ext3(U) jbd(U)
CPU: 2
EIP: 0060:[<0211ddb0>] Tainted: P VLI
EFLAGS: 00010286 (2.6.9-1.1_FC2custom)
EIP is at mm_release+0x33/0x70
eax: 00000000 ebx: 26506030 ecx: 00000000 edx: 00000000
esi: f6ff6828 edi: 00000000 ebp: 0000000b esp: 23b82e50
ds: 007b es: 007b ss: 0068
Process pppd (pid: 27091, threadinfo=23b82000 task=26506030)
Stack: 00000000 00000000 23b82f64 26506030 02121a20 23b82000 23b82f64 00000000
022c9112 021064a2 0000000b 23b82f64 022c9112 00000000 000000ff 0000000b
00000000 02106784 00001000 23b82f64 00000000 02106784 00001000 02106850
Call Trace:
[<02121a20>] do_exit+0xc3/0x3bd
[<021064a2>] do_divide_error+0x0/0xea
[<02106784>] do_invalid_op+0x0/0xd5
[<02106784>] do_invalid_op+0x0/0xd5
[<02106850>] do_invalid_op+0xcc/0xd5
[<0211bff5>] load_balance+0x27/0x135
[<02121d10>] do_exit+0x3b3/0x3bd
[<022b9a4a>] schedule+0x87e/0x8aa
[<0217e45d>] proc_delete_inode+0x0/0x61
[<022b9a4a>] schedule+0x87e/0x8aa
[<02121d10>] do_exit+0x3b3/0x3bd
[<02121e05>] sys_exit_group+0x0/0xd
Code: 8b 90 14 01 00 00 31 c0 8e e0 8e e8 85 d2 74 11 c7 83 14 01 00 00 00 00 00 00 89 d0 e8 b5 ea ff ff 8b b3 1c 01 00 00 85 f6 74 38 <8b> 47 24 48 7e 32 c7 83 1c 01 00 00 00 00 00 00 89 e2 89 f1 c7
<1>Unable to handle kernel NULL pointer dereference at virtual address 00000024
printing eip:
0211ddb0
*pde = 00004001
Oops: 0000 [#3]
SMP
Modules linked in: sch_tbf(U) ppp_async(U) crc_ccitt(U) ppp_mppe(U) ppp_generic(U) slhc(U) ipt_limit(U) ipt_REJECT(U) ipt_multiport(U) iptable_filter(U) iptable_nat(U) ip_conntrack(U) ip_tables(U) sunrpc(U) e100(U) mii(U) sg(U) scsi_mod(U) microcode(U) dm_mod(U) ohci_hcd(U) button(U) battery(U) ac(U) ext3(U) jbd(U)
CPU: 2
EIP: 0060:[<0211ddb0>] Tainted: P VLI
EFLAGS: 00010286 (2.6.9-1.1_FC2custom)
EIP is at mm_release+0x33/0x70
eax: 00000000 ebx: 26506030 ecx: 00000000 edx: 00000000
esi: f6ff6828 edi: 00000000 ebp: 0000000b esp: 23b82cc8
ds: 007b es: 007b ss: 0068

I started also noticing "Neighbour table overflow" error messages as well.
This server makes heavy use of proxy arp, so I wonder if I need to tweak
the gc_thresh* and the other gc* variables in proc...

The weird thing is that even after these "oopses" happened, the box was
still functioning. I could access the web server running on it, it was
still passing traffic for existing tunnels, but I could not establish new
ones. Couldn't ssh in, etc (thus I had to hard reset it).

As you can see, this is running on kernel 2.6.9 (from Fedora Core 2 testing
update tree) w/ your patch you mentioned below.

Any ideas?

On Wed, Nov 03, 2004 at 08:27:09PM -0500, Rajesh Venkatasubramanian wrote:
> Hi Ray,
>
> Can you please apply the patch I recently posted and report
> back.
>
> http://marc.theaimsgroup.com/?l=linux-kernel&m=109926628920398
>
> The patch fixes a bug reported earlier. However, earlier
> oops were triggered at mm/prio_tree.c:538.
>
> I haven't looked at the trace carefully. I will do so .
> Please report back if the previous patch fixes your problem .
>
> Thanks,
> Rajesh
>
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