Re: VM ops on 37-rc1

[Wu Fengguang]

Try revert the latest change to mm/vmstat.c, Michael added code to
show dirty thresholds there.

Thanks,
Fengguang

On Wed, Nov 03, 2010 at 02:55:41PM +0800, Shi, Alex wrote:
> I found some ops on one of Bensely Core2 machine. The ops may pops up
> just system after booted. 2.6.36 kernel is good. The similar ops also
> appears on IA64 machine.   Any idea of this?
> 
> general protection fault: 0000 [#1] SMP
> last sysfs file: /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
> CPU 1
> Modules linked in: video output
> 
> Pid: 8494, comm: sadc Not tainted 2.6.37-rc1 #1 X7DWN/X7DW3
> RIP: 0010:[<ffffffff812c6d89>]  [<ffffffff812c6d89>] strnlen+0x11/0x1a
> RSP: 0018:ffff88022f1ddcf0  EFLAGS: 00010297
> RAX: 41ffffffff81a197 RBX: 0000000000000000 RCX: ffffffffffffffff
> RDX: 41ffffffff81a197 RSI: fffffffffffffffe RDI: 41ffffffff81a197
> RBP: ffff88022ef42000 R08: 0000000000000002 R09: ffffffff81cb7a50
> R10: ffff88022f1ddf50 R11: ffffffff81c4e3c8 R12: 41ffffffff81a197
> R13: 000000000000ffff R14: ffff88022ef43000 R15: ffffffff81a19438
> FS:  00007fd06b06e6f0(0000) GS:ffff8800cfc40000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00007fd06b0a2000 CR3: 000000022db81000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process sadc (pid: 8494, threadinfo ffff88022f1dc000, task ffff88022b9d5a30)
> Stack:
>  ffffffff812c846d ffff88022f1ddd88 ffff88022ef42000 ffffffff81a19436
>  ffff88022ef43000 ffff88022ef42000 ffffffff812c9196 ffff88022f08e4c0
>  0000000000001000 ffffffffff0a0004 ffffffff810b30a1 0000000000000000
> Call Trace:
>  [<ffffffff812c846d>] ? string+0x43/0xb5
>  [<ffffffff812c9196>] ? vsnprintf+0x1d8/0x421
>  [<ffffffff810b30a1>] ? vma_adjust+0x205/0x435
>  [<ffffffff810df8f5>] ? seq_printf+0x67/0x8f
>  [<ffffffff8160d42b>] ? mutex_lock+0x20/0x44
>  [<ffffffff8160d42b>] ? mutex_lock+0x20/0x44
>  [<ffffffff810a9087>] ? all_vm_events+0x60/0x73
>  [<ffffffff8103b615>] ? put_online_cpus+0x22/0x54
>  [<ffffffff810a9169>] ? vmstat_start+0xcf/0x103
>  [<ffffffff810a89a5>] ? vmstat_show+0x23/0x27
>  [<ffffffff810dfe79>] ? seq_read+0x181/0x364
>  [<ffffffff8110d8eb>] ? proc_reg_read+0x6a/0x84
>  [<ffffffff810c86fc>] ? vfs_read+0xa8/0x12f
>  [<ffffffff810c8ae4>] ? sys_read+0x45/0x6e
>  [<ffffffff8100296b>] ? system_call_fastpath+0x16/0x1b
> Code: f2 ae 48 f7 d1 48 8d 44 11 ff 40 38 30 74 0a 48 ff c8 48 39 d0 73 f3 31 c0 c3 48 89 f8 eb 03 48 ff c0 48 ff ce 48 83 fe ff 74 05 <80> 38 00 75 ef 48 29 f8 c3 31 c0 eb 12 41 38 c8 74 0a 48 ff c2
> RIP  [<ffffffff812c6d89>] strnlen+0x11/0x1a
>  RSP <ffff88022f1ddcf0>
> ---[ end trace 75434a01211a18e0 ]---
> 
> Sometime, the following ops appears. 
> 
> 
> BUG: unable to handle kernel paging request at ffffff81a19733ff
> IP: [<ffffffff812c6d89>] strnlen+0x11/0x1a
> PGD 1c41067 PUD 0
> Oops: 0000 [#3] SMP
> last sysfs file: /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
> CPU 0
> Modules linked in: video output
> 
> Pid: 1781, comm: sadc Tainted: G      D     2.6.37-rc1 #1 X7DWN/X7DW3
> RIP: 0010:[<ffffffff812c6d89>]  [<ffffffff812c6d89>] strnlen+0x11/0x1a
> RSP: 0018:ffff88022dea1cf0  EFLAGS: 00010297
> RAX: ffffff81a19733ff RBX: 0000000000000000 RCX: ffffffffffffffff
> RDX: ffffff81a19733ff RSI: fffffffffffffffe RDI: ffffff81a19733ff
> RBP: ffff88022ee38000 R08: 0000000000000002 R09: ffffffff81cb7a50
> R10: ffff88022dea1f50 R11: ffffffff81c4e3c8 R12: ffffff81a19733ff
> R13: 000000000000ffff R14: ffff88022ee39000 R15: ffffffff81a19438
> FS:  00007fd6725dc6f0(0000) GS:ffff8800cfc00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: ffffff81a19733ff CR3: 000000022e5e7000 CR4: 00000000000006f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process sadc (pid: 1781, threadinfo ffff88022dea0000, task ffff88022e1229a0)
> Stack:
>  ffffffff812c846d ffff88022dea1d88 ffff88022ee38000 ffffffff81a19436
>  ffff88022ee39000 ffff88022ee38000 ffffffff812c9196 ffff88022ee086c0
>  0000000000001000 ffffffffff0a0004 ffffffff810b30a1 0000000000000000
> Call Trace:
>  [<ffffffff812c846d>] ? string+0x43/0xb5
>  [<ffffffff812c9196>] ? vsnprintf+0x1d8/0x421
>  [<ffffffff810b30a1>] ? vma_adjust+0x205/0x435
>  [<ffffffff810df8f5>] ? seq_printf+0x67/0x8f
>  [<ffffffff8160d42b>] ? mutex_lock+0x20/0x44
>  [<ffffffff8160d42b>] ? mutex_lock+0x20/0x44
>  [<ffffffff810a9087>] ? all_vm_events+0x60/0x73
>  [<ffffffff8103b615>] ? put_online_cpus+0x22/0x54
>  [<ffffffff810a9169>] ? vmstat_start+0xcf/0x103
>  [<ffffffff810a89a5>] ? vmstat_show+0x23/0x27
>  [<ffffffff810dfe79>] ? seq_read+0x181/0x364
>  [<ffffffff8110d8eb>] ? proc_reg_read+0x6a/0x84
>  [<ffffffff810c86fc>] ? vfs_read+0xa8/0x12f
>  [<ffffffff810c8ae4>] ? sys_read+0x45/0x6e
>  [<ffffffff8100296b>] ? system_call_fastpath+0x16/0x1b
> Code: f2 ae 48 f7 d1 48 8d 44 11 ff 40 38 30 74 0a 48 ff c8 48 39 d0 73 f3 31 c0 c3 48 89 f8 eb 03 48 ff c0 48 ff ce 48 83 fe ff 74 05 <80> 38 00 75 ef 48 29 f8 c3 31 c0 eb 12 41 38 c8 74 0a 48 ff c2
> RIP  [<ffffffff812c6d89>] strnlen+0x11/0x1a
> 
> 
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