Possible regression with skb_clone() in 2.6.36

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I've been experiencing some problems when running the L2CAP Streaming mode in
2.6.36. The system quickly runs in an Out Of Memory condition and crash. That
wasn't happening before, so I think we may have a regression here (I didn't
find where yet). The crash log is below.

The following patch does not fix the regression, but shows that removing the
skb_clone() call from l2cap_streaming_send() we workaround the problem. The
patch is good anyway because it saves memory and time.

By now I have no idea on how to fix this.


[ 5066.137533] Bluetooth: L2CAP ver 2.15
[ 5066.137873] Bluetooth: L2CAP socket layer initialized
[ 5066.545179] Bluetooth: RFCOMM TTY layer initialized
[ 5066.545879] Bluetooth: RFCOMM socket layer initialized
[ 5066.546582] Bluetooth: RFCOMM ver 1.11
[ 5092.268021] l2test invoked oom-killer: gfp_mask=0x4d0, order=0, oom_adj=0, oom_sc
ore_adj=0
[ 5092.268872] Pid: 3897, comm: l2test Not tainted 2.6.36-rc3 #5
[ 5092.269863] Call Trace:
[ 5092.270265]  [<ffffffff8138b6a6>] ? _raw_spin_unlock+0x26/0x30
[ 5092.270878]  [<ffffffff810c0827>] T.427+0x77/0x1e0
[ 5092.271874]  [<ffffffff811b85e7>] ? security_real_capable_noaudit+0x37/0x60
[ 5092.272956]  [<ffffffff810c0e3a>] out_of_memory+0x2ca/0x2f0
[ 5092.273894]  [<ffffffff810c3d43>] __alloc_pages_nodemask+0x693/0x6b0
[ 5092.274871]  [<ffffffff810ea3e6>] cache_alloc_refill+0x2d6/0x5c0
[ 5092.275864]  [<ffffffff810ea805>] __kmalloc+0x135/0x150
[ 5092.276876]  [<ffffffff8130f2ae>] __alloc_skb+0x6e/0x150
[ 5092.277865]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.278652]  [<ffffffff8130ace2>] sock_alloc_send_pskb+0x1c2/0x320
[ 5092.278927]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.279864]  [<ffffffff81312add>] ? memcpy_fromiovec+0x6d/0x90
[ 5092.280864]  [<ffffffff8130ae50>] sock_alloc_send_skb+0x10/0x20
[ 5092.281867]  [<ffffffffa00e600f>] l2cap_create_iframe_pdu+0x9f/0x2c0 [l2cap]
[ 5092.282865]  [<ffffffffa00e84b9>] l2cap_sock_sendmsg+0x5d9/0x910 [l2cap]
[ 5092.283932]  [<ffffffff8138ba3c>] ? restore_args+0x0/0x30
[ 5092.284865]  [<ffffffff8130725b>] sock_sendmsg+0xdb/0x100
[ 5092.285652]  [<ffffffff8138ba3c>] ? restore_args+0x0/0x30
[ 5092.285864]  [<ffffffff8138ba3c>] ? restore_args+0x0/0x30
[ 5092.286864]  [<ffffffff813073c0>] sys_sendto+0xf0/0x130
[ 5092.287864]  [<ffffffff8138b60b>] ? _raw_spin_unlock_irq+0x2b/0x40
[ 5092.288872]  [<ffffffff81093cfd>] ? trace_hardirqs_on_caller+0x13d/0x180
[ 5092.289927]  [<ffffffff81093d4d>] ? trace_hardirqs_on+0xd/0x10
[ 5092.290864]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.291649]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.291864]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.292864]  [<ffffffff8130740f>] sys_send+0xf/0x20
[ 5092.293870]  [<ffffffff8132ccd6>] compat_sys_socketcall+0x146/0x1f0
[ 5092.294875]  [<ffffffff81053ee4>] sysenter_dispatch+0x7/0x30
[ 5092.295673] Mem-Info:
[ 5092.295863] DMA per-cpu:
[ 5092.296214] CPU    0: hi:    0, btch:   1 usd:   0
[ 5092.296925] DMA32 per-cpu:
[ 5092.297298] CPU    0: hi:   90, btch:  15 usd:  85
[ 5092.297864] active_anon:504 inactive_anon:543 isolated_anon:0
[ 5092.297865]  active_file:14 inactive_file:3 isolated_file:0
[ 5092.297866]  unevictable:0 dirty:0 writeback:3 unstable:0
[ 5092.297866]  free:728 slab_reclaimable:559 slab_unreclaimable:39895
[ 5092.297867]  mapped:12 shmem:35 pagetables:84 bounce:0
[ 5092.299944] DMA free:1064kB min:124kB low:152kB high:184kB active_anon:0kB inacti
ve_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB iso
lated(file):0kB present:15768kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem
:0kB slab_reclaimable:0kB slab_unreclaimable:14916kB kernel_stack:0kB pagetables:0kB
 unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
[ 5092.301862] lowmem_reserve[]: 0 236 236 236
[ 5092.303134] DMA32 free:1848kB min:1904kB low:2380kB high:2856kB active_anon:2016k
B inactive_anon:2172kB active_file:56kB inactive_file:12kB unevictable:0kB isolated(
anon):0kB isolated(file):0kB present:242380kB mlocked:0kB dirty:0kB writeback:12kB m
apped:48kB shmem:140kB slab_reclaimable:2236kB slab_unreclaimable:144664kB kernel_st
ack:456kB pagetables:336kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:1
03 all_unreclaimable? yes
[ 5092.304962] lowmem_reserve[]: 0 0 0 0
[ 5092.306066] DMA: 0*4kB 1*8kB 0*16kB 1*32kB 0*64kB 0*128kB 0*256kB 0*512kB 1*1024k
B 0*2048kB 0*4096kB = 1064kB
[ 5092.307862] DMA32: 10*4kB 2*8kB 0*16kB 0*32kB 0*64kB 0*128kB 1*256kB 1*512kB 1*10
24kB 0*2048kB 0*4096kB = 1848kB
[ 5092.309467] 52 total pagecache pages
[ 5092.309862] 0 pages in swap cache
[ 5092.310317] Swap cache stats: add 0, delete 0, find 0/0
[ 5092.310862] Free swap  = 0kB
[ 5092.311260] Total swap = 0kB
[ 5092.313796] 65530 pages RAM
[ 5092.313868] 22603 pages reserved
[ 5092.314324] 206 pages shared
[ 5092.314862] 39353 pages non-shared
[ 5092.315348] [ pid ]   uid  tgid total_vm      rss cpu oom_adj oom_score_adj name
[ 5092.315867] [    1]     0     1      438       19   0       0             0 init
[ 5092.316871] [ 1018]     0  1018      537       75   0     -17         -1000 udevd
[ 5092.318867] [ 2217]   101  2217      606       39   0       0             0 dbus-
daemon
[ 5092.319865] [ 2825]     0  2825      481       29   0       0             0 dhcpc
d
[ 5092.320865] [ 3497]     0  3497     1091       83   0       0             0 sshd
[ 5092.321969] [ 3535]     0  3535      477       31   0       0             0 agett
y
[ 5092.322864] [ 3536]     0  3536      477       30   0       0             0 agett
y
[ 5092.323864] [ 3537]     0  3537      477       29   0       0             0 agett
y
[ 5092.325937] [ 3538]     0  3538      477       31   0       0             0 agett
y
[ 5092.326865] [ 3539]     0  3539      477       31   0       0             0 agett
y
[ 5092.327864] [ 3540]     0  3540      477       31   0       0             0 agett
y
[ 5092.328864] [ 3541]     0  3541     1738      105   0       0             0 sshd
[ 5092.329865] [ 3545]     0  3545      745       72   0       0             0 bash
[ 5092.330864] [ 3550]     0  3550      706       43   0       0             0 scree
n
[ 5092.331866] [ 3551]     0  3551      772      124   0       0             0 scree
n
[ 5092.332965] [ 3552]     0  3552      745       77   0       0             0 bash
[ 5092.333865] [ 3557]     0  3557      745       77   0       0             0 bash
[ 5092.334867] [ 3562]     0  3562      536       75   0     -17         -1000 udevd
[ 5092.336865] [ 3567]     0  3567      536       75   0     -17         -1000 udevd
[ 5092.337865] [ 3887]     0  3887      935       54   0       0             0 bluet
oothd
[ 5092.338864] [ 3896]     0  3896      458       24   0       0             0 l2tes
t
[ 5092.339864] [ 3897]     0  3897      458       24   0       0             0 l2tes
t
[ 5092.340933] [ 3942]     0  3942      458       29   0       0             0 l2tes
t
[ 5092.341863] Kernel panic - not syncing: Out of memory and no killable processes..
.
[ 5092.341864]
[ 5092.342864] Pid: 3897, comm: l2test Not tainted 2.6.36-rc3 #5
[ 5092.343862] Call Trace:
[ 5092.344934]  [<ffffffff813884d9>] panic+0x8c/0x199
[ 5092.345621]  [<ffffffff810c0e54>] out_of_memory+0x2e4/0x2f0
[ 5092.345864]  [<ffffffff810c3d43>] __alloc_pages_nodemask+0x693/0x6b0
[ 5092.346894]  [<ffffffff810ea3e6>] cache_alloc_refill+0x2d6/0x5c0
[ 5092.347864]  [<ffffffff810ea805>] __kmalloc+0x135/0x150
[ 5092.348871]  [<ffffffff8130f2ae>] __alloc_skb+0x6e/0x150
[ 5092.349865]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.350628]  [<ffffffff8130ace2>] sock_alloc_send_pskb+0x1c2/0x320
[ 5092.350935]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.351864]  [<ffffffff81312add>] ? memcpy_fromiovec+0x6d/0x90
[ 5092.352864]  [<ffffffff8130ae50>] sock_alloc_send_skb+0x10/0x20
[ 5092.353867]  [<ffffffffa00e600f>] l2cap_create_iframe_pdu+0x9f/0x2c0 [l2cap]
[ 5092.354865]  [<ffffffffa00e84b9>] l2cap_sock_sendmsg+0x5d9/0x910 [l2cap]
[ 5092.355864]  [<ffffffff8138ba3c>] ? restore_args+0x0/0x30
[ 5092.356864]  [<ffffffff8130725b>] sock_sendmsg+0xdb/0x100
[ 5092.357612]  [<ffffffff8138ba3c>] ? restore_args+0x0/0x30
[ 5092.357931]  [<ffffffff8138ba3c>] ? restore_args+0x0/0x30
[ 5092.358864]  [<ffffffff813073c0>] sys_sendto+0xf0/0x130
[ 5092.359864]  [<ffffffff8138b60b>] ? _raw_spin_unlock_irq+0x2b/0x40
[ 5092.360929]  [<ffffffff81093cfd>] ? trace_hardirqs_on_caller+0x13d/0x180
[ 5092.361866]  [<ffffffff81093d4d>] ? trace_hardirqs_on+0xd/0x10
[ 5092.362864]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.363653]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.364868]  [<ffffffff810d3a00>] ? might_fault+0x40/0x90
[ 5092.365865]  [<ffffffff8130740f>] sys_send+0xf/0x20
[ 5092.366945]  [<ffffffff8132ccd6>] compat_sys_socketcall+0x146/0x1f0
[ 5092.367865]  [<ffffffff81053ee4>] sysenter_dispatch+0x7/0x30

Gustavo F. Padovan (1):
      Bluetooth: Simplify L2CAP Streaming mode sending

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