netdev - Re: 2.6.39-rc7-git11, x86/32, failed on ppp2897'th interface, PERCPU: allocation failed

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Date:	Thu, 19 May 2011 08:39:18 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
Cc:	netdev@...r.kernel.org
Subject: Re: 2.6.39-rc7-git11, x86/32, failed on ppp2897'th interface,
 PERCPU:  allocation failed

Le jeudi 19 mai 2011 à 09:35 +0300, Denys Fedoryshchenko a écrit :
> Hi, again
> 
>  Just tried to upgrade large NAS from 2.6.38.6 to 2.6.39-rc7-git11, and 
>  at same time enabling ipv6 on it.
>  Got that, after ppp2897 brought up (sure it means there is other 2896 
>  available, and also few ethernet vlans, around 32).
>  I am not sure it is a bug, but it looks i had free memory(the box had 
>  8GB free), and lowmem too, also i will try to enable there 64bit kernel 
>  at evening.
> 
>  May 17 16:00:42 194.146.155.70 kernel: [14925.897799] PERCPU: 
>  allocation failed, size=2048 align=4, failed to allocate new chunk
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898163] Pid: 24207, comm: 
>  pppd Not tainted 2.6.39-rc7-git11-build-0058 #4
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898164] Call Trace:
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898169]  [<c0335548>] ? 
>  printk+0x18/0x20
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898173]  [<c017ecd0>] 
>  pcpu_alloc+0x616/0x67a
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898176]  [<c0194a80>] ? 
>  __kmalloc_track_caller+0x68/0xc0
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898189]  [<f8ae196c>] ? 
>  kzalloc+0xb/0xd [ipv6]
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898193]  [<c01320a5>] ? 
>  _local_bh_enable_ip.clone.6+0x18/0x71
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898195]  [<c017ed3e>] 
>  __alloc_percpu+0xa/0xc
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898198]  [<c030aa7d>] 
>  snmp_mib_init+0x2f/0x51
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898207]  [<f8ae2ad0>] 
>  ipv6_add_dev+0x133/0x2a3 [ipv6]
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898209]  [<c030e12d>] ? 
>  ip_mc_init_dev+0x75/0x86
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898211]  [<c0309321>] ? 
>  devinet_sysctl_register+0x34/0x38
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898221]  [<f8ae5754>] 
>  addrconf_notify+0x50/0x6a5 [ipv6]
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898224]  [<c0218f52>] ? 
>  add_uevent_var+0xa3/0xa3
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898226]  [<c0309901>] ? 
>  inetdev_event+0x55/0x3c0
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898230]  [<c01446f9>] 
>  notifier_call_chain+0x26/0x48
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898232]  [<c01447a7>] 
>  raw_notifier_call_chain+0x1a/0x1c
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898236]  [<c02c8115>] 
>  call_netdevice_notifiers+0x44/0x4b
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898238]  [<c01320a5>] ? 
>  _local_bh_enable_ip.clone.6+0x18/0x71
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898240]  [<c0132106>] ? 
>  local_bh_enable_ip+0x8/0xa
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898242]  [<c02ca19b>] 
>  register_netdevice+0x1fb/0x255
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898244]  [<c02ca227>] 
>  register_netdev+0x32/0x41
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898247]  [<c021d5cf>] ? 
>  sprintf+0x1c/0x1e
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898249]  [<c029647a>] 
>  ppp_ioctl+0x224/0xaea
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898252]  [<c01a35cc>] ? 
>  do_filp_open+0x26/0x67
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898254]  [<c0296256>] ? 
>  ppp_write+0x98/0x98
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898256]  [<c01a53ce>] 
>  do_vfs_ioctl+0x45e/0x498
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898258]  [<c01a118e>] ? 
>  getname_flags+0x1e/0xad
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898260]  [<c019391b>] ? 
>  kmem_cache_free+0x14/0x83
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898262]  [<c01ab5bb>] ? 
>  alloc_fd+0x4e/0xba
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898265]  [<c0199465>] ? 
>  do_sys_open+0xdb/0xe5
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898266]  [<c019ac7b>] ? 
>  fput+0x13/0x155
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898268]  [<c01a4387>] ? 
>  do_fcntl+0x227/0x3aa
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898270]  [<c01a543b>] 
>  sys_ioctl+0x33/0x4c
>  May 17 16:00:42 194.146.155.70 kernel: [14925.898273]  [<c0336edd>] 
>  syscall_call+0x7/0xb
> --

Its a known problem : When ipv6 is enabled, we allocate percpu memory to
hold per device snmp counters.

make sure kernel idea of max possible cpus matches real number of cpus.

And yes, switching to 64bit kernel helps a lot.



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