[BUG] WARNING: at kernel/trace/ring_buffer.c:3420

[Li Zefan]

While running a ftrace test, a kernel warning showed up. The bug is not so
easy to reproduce, normally it takes 30 mins to 2 hours.

After revering 3c05d7482777f15e71bb4cb1ba78dee2800dfec6, I ran the test
for 15 hours, and the bug seems disapeared.

------------[ cut here ]------------
WARNING: at kernel/trace/ring_buffer.c:3420 ring_buffer_reset_cpu+0x5a/0x9c()
Hardware name: PRIMERGY                      
Modules linked in: ipt_MASQUERADE iptable_nat nf_nat bridge stp llc deflate zlib_deflate ctr camellia cast5 rmd160 crypto_null ccm serpent blowfish twofish_x86_64 twofish_common ecb xcbc cbc sha256_generic sha512_generic des_generic cryptd aes_x86_64 aes_generic ah6 ah4 esp6 esp4 xfrm4_mode_beet xfrm4_tunnel tunnel4 xfrm4_mode_tunnel xfrm4_mode_transport xfrm6_mode_transport xfrm6_mode_beet ipcomp ipcomp6 xfrm_ipcomp xfrm6_tunnel tunnel6 af_key autofs4 sunrpc ipv6 dm_mirror dm_region_hash dm_log dm_multipath uinput i5k_amb hwmon e1000e i5000_edac edac_core iTCO_wdt iTCO_vendor_support shpchp i2c_i801 i2c_core serio_raw pcspkr pata_acpi ata_generic mptsas mptscsih ata_piix mptbase scsi_transport_sas dm_mod [last unloaded: speedstep_lib]
Pid: 2108, comm: ftrace_current_ Tainted: G        W  2.6.33-tip+ #2
Call Trace:
 [<ffffffff8104ebd0>] warn_slowpath_common+0x7c/0x94
 [<ffffffff8104ebfc>] warn_slowpath_null+0x14/0x16
 [<ffffffff810a50f5>] ring_buffer_reset_cpu+0x5a/0x9c
 [<ffffffff810aa3f0>] tracing_reset_online_cpus+0x4a/0x79
 [<ffffffff810aa434>] tracer_init+0x15/0x20
 [<ffffffff810aa601>] tracing_set_tracer+0x1c2/0x1e7
 [<ffffffff810d9847>] ? might_fault+0x5c/0xac
 [<ffffffff810aa6b2>] tracing_set_trace_write+0x8c/0xbc
 [<ffffffff810a8e79>] ? trace_buffer_lock_reserve+0x21/0x56
 [<ffffffff810a95ce>] ? trace_current_buffer_lock_reserve+0x16/0x18
 [<ffffffff813ef135>] ? retint_swapgs+0x13/0x1b
 [<ffffffff81104618>] vfs_write+0xae/0x10b
 [<ffffffff81104735>] sys_write+0x4a/0x6e
 [<ffffffff81009da6>] tracesys+0xd0/0xd5
---[ end trace f7002f0890d5b023 ]---
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