Re: vmalloc_sync_all() patch problems?

[David Vrabel <david.vrabel@citrix.com>]

On 28/09/11 15:28, Christopher S. Aker wrote:
> 4.1.2-rc3-pre @ 23159
> 3.0.4 + vmalloc_sync_all() patch

This is surprising as that vmalloc_sync_all() patch is a revert of a
recent change only present in 3.0 and others have reported the patch
works for them.

You're going to have to provide more information on your system and
tests I think.

David

> While running my Xen test suite:
> 
> BUG: unable to handle kernel paging request at bffffd68
> IP: [<c102bb51>] vmalloc_sync_all+0x141/0x1e0
> *pdpt = 0000000027d71027 *pde = 0000000000000000
> Oops: 0000 [#1] SMP
> Modules linked in: ebt_arp ip6t_rt ebt_mark ebt_limit ip6table_mangle
> xt_mark ebtable_nat ebtable_filter
> Pid: 39, comm: xenwatch Not tainted 3.0.4-1 #1 Supermicro X8DTU/X8DTU
> EIP: 0061:[<c102bb51>] EFLAGS: 00010283 CPU: 3
> EIP is at vmalloc_sync_all+0x141/0x1e0
> EAX: bffffd68 EBX: efe5a720 ECX: 00000008 EDX: 00000001
> ESI: ea082a34 EDI: c1a73d68 EBP: eb1d9e80 ESP: eb1d9e4c
>  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
> Process xenwatch (pid: 39, ti=eb1d8000 task=eb11b0c0 task.ti=eb1d8000)
> Stack:
>  2b048000 00000000 2b048000 00000000 fffff001 00000008 c0000d68 7bf85067
>  f5a00000 00000018 ea254480 eb1d9f14 eb1d9f54 eb1d9e94 c10e5212 c10e35a0
>  00000000 e7d3d600 eb1d9ee4 c1446275 eb1d9ea8 c13932c0 e7d3d600 00000011
> Call Trace:
>  [<c10e5212>] alloc_vm_area+0x42/0x60
>  [<c10e35a0>] ? is_vmalloc_or_module_addr+0x50/0x50
>  [<c1446275>] xen_blkif_map+0x35/0x1e0
>  [<c13932c0>] ? xen_evtchn_do_upcall+0x20/0x30
>  [<c1446a61>] frontend_changed+0x261/0x2d0
>  [<c139852d>] xenbus_otherend_changed+0x7d/0x90
>  [<c1398732>] frontend_changed+0x12/0x20
>  [<c1396aa5>] xenwatch_thread+0x85/0x130
>  [<c10625d0>] ? wake_up_bit+0x60/0x60
>  [<c1396a20>] ? split+0xd0/0xd0
>  [<c10621e4>] kthread+0x74/0x80
>  [<c1062170>] ? kthread_worker_fn+0x160/0x160
>  [<c16ca2b6>] kernel_thread_helper+0x6/0x10
> Code: c1 89 c7 81 e7 00 f0 ff ff 03 7d e4 8b 17 89 55 e8 8b 4f 04 83 e2
> 01 89 4d e0 0f 84 68 ff ff ff 8b 45 dc 25 00 f0 ff ff 03 45 e4 <8b> 08
> 8b 50 04 f6 c1 01 89 55 dc 74 7a 8b 55 dc 89 c8 ff 15 14
> EIP: [<c102bb51>] vmalloc_sync_all+0x141/0x1e0 SS:ESP 0069:eb1d9e4c
> CR2: 00000000bffffd68
> ---[ end trace 486c192808e46938 ]---
> INFO: rcu_sched_state detected stall on CPU 7 (t=60000 jiffies)
> INFO: rcu_sched_state detected stall on CPU 7 (t=240030 jiffies)
> ... and so on
> 
> -Chris
> 
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