[ ssic-linux-Bugs-1938520 ] onnode 2 ls /proc/$$/task/1 causes oops

Bugs item #1938520, was opened at 2008-04-09 13:21
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Category: Process Management
Group: v1.9.3
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: John Hughes (hughesj)
Assigned to: Nobody/Anonymous (nobody)
Summary: onnode 2 ls /proc/$$/task/1 causes oops

Initial Comment:
On node 1 run:

onnode 2 ls /proc/$$/task/1

And node 2 oopses in proc_task_lookup.

If any task other than "1" is used it works ok.

Here's what the oops looks like:

Oops: 0000 [#1]
SMP
Modules linked in: ext3 jbd parport_pc parport floppy uhci_hcd ohci_hcd ehci_hcd ide_scsi scsi_mod i2c_piix4 i2c_core ne2k_pci 8390
CPU:    0
EIP:    0060:[<c01a8714>]    Not tainted VLI
EFLAGS: 00000246   (2.6.11-ssi-686-smp)
EIP is at proc_task_lookup+0xf4/0x210
eax: 00000000   ebx: 00000000   ecx: cf06d500   edx: ce55ae10
esi: ce55ae84   edi: ce55ae00   ebp: cdcdee18   esp: cdcdede0
ds: 007b   es: 007b   ss: 0068
Process ls (pid: 68605, threadinfo=cdcde000 task=cf12d390)
Stack: ce55ae00 00000000 00000000 00000000 00000000 00000000 cdcdee08 cdcde000
       cf02ba00 00000001 00000001 fffffff4 cdc849f4 cdc84a6c cdcdee3c c017c0fc
       cdc849f4 cdc83680 cdcdef10 cdc83680 00000000 cdcdef10 c13b4f80 cdcdee5c
Call Trace:
 [<c010694f>] show_stack+0x7f/0xa0
 [<c0106b04>] show_registers+0x164/0x220
 [<c0106e94>] die+0xf4/0x1c0
 [<c011f1b5>] do_page_fault+0x375/0x695
 [<c01065a3>] error_code+0x2b/0x30
 [<c017c0fc>] real_lookup+0xec/0x120
 [<c017c4d6>] do_lookup+0x86/0xa0
 [<c017cba8>] link_path_walk+0x6b8/0xd60
 [<c017d51d>] path_lookup+0x9d/0x1b0
 [<c017d7df>] __user_walk+0x3f/0x80
 [<c01773eb>] vfs_lstat+0x1b/0x60
 [<c0177b5b>] sys_lstat64+0x1b/0x40
 [<c0105a3b>] syscall_call+0x7/0xb
Code: c0 89 44 24 08 31 c0 89 54 24 14 89 44 24 04 e8 f3 6c 08 00 85 c0 75 0b 8b 55 e8 8b 45 f0 39 42 04 74 34 89 3c 24 e8 cc 53 09 00 <f0> ff 4b 08 0f 94 c0 84 c0 75 11 b8 fe ff ff ff 83 c4 2c 5b 5e

Entering kdb (current=0xcf12d390, pid 68605) on processor 0 Oops: Oops
due to oops @ 0xc01a8714
eax = 0x00000000 ebx = 0x00000000 ecx = 0xcf06d500 edx = 0xce55ae10
esi = 0xce55ae84 edi = 0xce55ae00 esp = 0xcdcdede0 eip = 0xc01a8714
ebp = 0xcdcdee18 xss = 0x00000068 xcs = 0x00000060 eflags = 0x00000246
xds = 0x0000007b xes = 0x0000007b origeax = 0xffffffff &regs = 0xcdcdedac
[0]kdb> bt
Stack traceback for pid 68605
0xcf12d390    68605    68485  1    0   R  0xcf12d570 *ls
EBP        EIP        Function (args)
0xcdcdee18 0xc01a8714 proc_task_lookup+0xf4 (0x0, 0xcf06d500, 0xce55ae10, 0xce55ae84, 0xce55ae00)
           0xc01065a3 error_code+0x2b
Interrupt registers:
eax = 0x00000000 ebx = 0x00000000 ecx = 0xcf06d500 edx = 0xce55ae10
esi = 0xce55ae84 edi = 0xce55ae00 esp = 0xcdcdede0 eip = 0xc01a8714
ebp = 0xcdcdee18 xss = 0x00000068 xcs = 0x00000060 eflags = 0x00000246
xds = 0x0000007b xes = 0x0000007b origeax = 0xffffffff &regs = 0xcdcdedac
           0x00000246 <unknown>+0x246
           0xce55ae00 <unknown>
[0]kdb>


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