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Subject2.4.3 oopses at lots of ppp sessions
Hi Guys,

2.4.3 (UP kernel UP machine,
oopses when I start lots of pppd eth0 simultaneously.
(I guess the problem is not pppoe specific, but I do not know exactly)

The last pppd sighs: PPP: couldn't register device (-17)
This is 2 oops not just 1...

:51 lima pppd[2093]: pppd 2.4.0 started by root, uid 0
:51 lima pppd[2093]: Sending PADI
:51 lima pppd[2093]: HOST_UNIQ successful match
:51 lima pppd[2093]: Tag error: TAG_SYS_ERR
:51 lima pppd[2093]: Failed to negotiate PPPoE connection: 25
Inappropriate ioctl for device
:51 lima pppd[2093]: Exit.
:51 lima kernel: EIP: 0010:[ppp_create_interface+400/452]
:51 lima kernel: EFLAGS: 00010286
:51 lima kernel: eax: c3ab77d8 ebx: c17d4e00 ecx: 00000000 edx:
:51 lima kernel: esi: 00000033 edi: c3ab77a0 ebp: 00000000 esp:
:51 lima kernel: ds: 0018 es: 0018 ss: 0018
:51 lima kernel: Process pppd (pid: 2031, stackpage=c3b23000)
:51 lima kernel: Stack: fffffff2 08076f48 c2cc3d80 ffffffe7 c3ab77a0
00000000 c029de64 c019e775
:51 lima kernel: ffffffff c3b23f5c 08076f48 08076f48 c004743e
fffffff2 c019e13c 00000000
:51 lima kernel: c2cc3d80 c004743e 08076f48 c2cc3d80 08076f48
c004743e ffffffe7 fffffff2
:51 lima kernel: Call Trace: [ppp_unattached_ioctl+97/320]
[ppp_ioctl+48/1544] [sys_ioctl+363/388] [system_call+51/56]
:51 lima kernel:
:51 lima kernel: Code: 89 41 04 8b 5c 24 10 89 4b 38 89 50 04 89 02 8b
44 24 24 8b
:51 lima kernel: PPP: couldn't register device (-17)
:51 lima kernel: Unable to handle kernel NULL pointer dereference at
virtual address 00000008
:51 lima kernel: printing eip:
:51 lima kernel: c01a014f
:51 lima kernel: *pde = 00000000
:51 lima kernel: Oops: 0000
:51 lima kernel: CPU: 0
:51 lima kernel: EIP: 0010:[ppp_create_interface+79/452]
:51 lima kernel: EFLAGS: 00010286
:51 lima kernel: eax: 00000033 ebx: ffffffc8 ecx: 00000032 edx:
:51 lima kernel: esi: ffffffff edi: c321ec00 ebp: ffffffe7 esp:
:51 lima kernel: ds: 0018 es: 0018 ss: 0018
:51 lima kernel: Process pppd (pid: 2035, stackpage=c17bf000)
:51 lima kernel: Stack: fffffff2 08076f48 c321ec00 ffffffe7 ffffffc8
ffffffef 00000000 c019e775
:51 lima kernel: ffffffff c17bff5c 08076f48 08076f48 c004743e
fffffff2 c019e13c 00000000
:51 lima kernel: c321ec00 c004743e 08076f48 c321ec00 08076f48
c004743e ffffffe7 fffffff2
:51 lima kernel: Call Trace: [ppp_unattached_ioctl+97/320]
[ppp_ioctl+48/1544] [sys_ioctl+363/388] [system_call+51/56]
:51 lima kernel:
:51 lima kernel: Code: 8b 53 40 39 c2 7f 0f eb ca 8b 7c 24 10 8b 47 40
89 c2 39 d6

0xc01a0100 <ppp_create_interface>: sub $0xc,%esp
0xc01a0103 <ppp_create_interface+3>: push %ebp
0xc01a0104 <ppp_create_interface+4>: push %edi
0xc01a0105 <ppp_create_interface+5>: push %esi
0xc01a0106 <ppp_create_interface+6>: push %ebx
0xc01a0107 <ppp_create_interface+7>: mov 0x20(%esp,1),%esi
0xc01a010b <ppp_create_interface+11>: mov $0xffffffff,%ecx
0xc01a0110 <ppp_create_interface+16>: movl $0xffffffef,0x14(%esp,1)
0xc01a0118 <ppp_create_interface+24>: movl $0xc029de64,0x18(%esp,1)
0xc01a0120 <ppp_create_interface+32>: jmp 0xc01a012c
0xc01a0122 <ppp_create_interface+34>: cmp %edx,%esi
0xc01a0124 <ppp_create_interface+36>: je 0xc01a029f
0xc01a012a <ppp_create_interface+42>: mov %edx,%ecx
0xc01a012c <ppp_create_interface+44>: mov 0x18(%esp,1),%eax
0xc01a0130 <ppp_create_interface+48>: mov (%eax),%eax
0xc01a0132 <ppp_create_interface+50>: mov %eax,0x18(%esp,1)
0xc01a0136 <ppp_create_interface+54>: cmp $0xc029de64,%eax
0xc01a013b <ppp_create_interface+59>: je 0xc01a0165
0xc01a013d <ppp_create_interface+61>: add $0xffffffc8,%eax
0xc01a0140 <ppp_create_interface+64>: mov %eax,0x10(%esp,1)
0xc01a0144 <ppp_create_interface+68>: test %esi,%esi
0xc01a0146 <ppp_create_interface+70>: jge 0xc01a0158
0xc01a0148 <ppp_create_interface+72>: mov 0x10(%esp,1),%ebx
0xc01a014c <ppp_create_interface+76>: lea 0x1(%ecx),%eax
0xc01a014f <ppp_create_interface+79>: mov 0x40(%ebx),%edx
^^^^^^ NULL pointer dereference HERE
0xc01a0152 <ppp_create_interface+82>: cmp %eax,%edx
0xc01a0154 <ppp_create_interface+84>: jg 0xc01a0165
0xc01a0156 <ppp_create_interface+86>: jmp 0xc01a0122
0xc01a0265 <ppp_create_interface+357>: call 0xc0111d7c <printk>
0xc01a026a <ppp_create_interface+362>: push %ebx
0xc01a026b <ppp_create_interface+363>: call 0xc0124330 <kfree>
0xc01a0270 <ppp_create_interface+368>: push %edi
0xc01a0271 <ppp_create_interface+369>: call 0xc0124330 <kfree>
0xc01a0276 <ppp_create_interface+374>: add $0x10,%esp
0xc01a0279 <ppp_create_interface+377>: jmp 0xc01a029f
0xc01a027b <ppp_create_interface+379>: nop
0xc01a027c <ppp_create_interface+380>: lea 0x0(%esi,1),%esi
0xc01a0280 <ppp_create_interface+384>: mov 0x18(%esp,1),%ecx
0xc01a0284 <ppp_create_interface+388>: mov 0x4(%ecx),%edx
0xc01a0287 <ppp_create_interface+391>: mov 0x10(%esp,1),%eax
0xc01a028b <ppp_create_interface+395>: add $0x38,%eax
0xc01a028e <ppp_create_interface+398>: mov (%edx),%ecx
0xc01a0290 <ppp_create_interface+400>: mov %eax,0x4(%ecx)
^^^^^^ NULL pointer dereference HERE
0xc01a0293 <ppp_create_interface+403>: mov 0x10(%esp,1),%ebx
0xc01a0297 <ppp_create_interface+407>: mov %ecx,0x38(%ebx)

ppp_create_interface(int unit, int *retp)
struct ppp *ppp;
struct net_device *dev;
struct list_head *list;
int last_unit = -1;
int ret = -EEXIST;
int i;

list = &all_ppp_units;
while ((list = list->next) != &all_ppp_units) {
ppp = list_entry(list, struct ppp, file.list);
if ((unit < 0 && ppp->file.index > last_unit + 1)
^^^^^^^^ _MAYBE_ this is
ppp_create_interface+79 ??
|| (unit >= 0 && unit < ppp->file.index))
if (unit == ppp->file.index)

if (ret != 0) {
printk(KERN_ERR "PPP: couldn't register device (%d)\n",
goto out;

list_add(&ppp->file.list, list->prev);
^^^^^^^^^ _MAYBE_ ppp_create_interface+400 ??
The caller of ppp_create_interface:

0xc019e75d <ppp_unattached_ioctl+73>: call 0xc022ddd4 <__get_user_4>
0xc019e762 <ppp_unattached_ioctl+78>: test %eax,%eax
0xc019e764 <ppp_unattached_ioctl+80>: jne 0xc019e848
0xc019e76a <ppp_unattached_ioctl+86>: lea 0xc(%esp,1),%eax
0xc019e76e <ppp_unattached_ioctl+90>: push %eax
0xc019e76f <ppp_unattached_ioctl+91>: push %edx
0xc019e770 <ppp_unattached_ioctl+92>: call 0xc01a0100

I do not have more time to debug least today.
What could be the problem, what should I check next?


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