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Date:	Wed, 12 Nov 2014 18:27:06 +0800
From:	lkp@...org
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Subject: [LKP] [ftrace/x86] WARNING: CPU: 0 PID: 1795 at
 kernel/trace/ftrace.c:2033 ftrace_get_addr_new+0x6e/0xb6()

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 12cce594fa8f12e002e7eb5d10141853c1e6a112 ("ftrace/x86: Allow !CONFIG_PREEMPT dynamic ops to use allocated trampolines")


+--------------------------------------------------------+------------+------------+
|                                                        | 15d5b02cc5 | 12cce594fa |
+--------------------------------------------------------+------------+------------+
| boot_successes                                         | 42         | 17         |
| boot_failures                                          | 4          | 4          |
| BUG:kernel_test_crashed                                | 4          | 1          |
| WARNING:at_kernel/trace/ftrace.c:ftrace_get_addr_new() | 0          | 3          |
| backtrace:perf_tp_event_init                           | 0          | 3          |
| backtrace:perf_init_event                              | 0          | 3          |
| backtrace:perf_event_alloc                             | 0          | 3          |
| backtrace:SyS_perf_event_open                          | 0          | 3          |
| backtrace:perf_ftrace_event_register                   | 0          | 3          |
| backtrace:perf_trace_init                              | 0          | 3          |
| backtrace:tipc_disc_init_msg                           | 0          | 1          |
| backtrace:tipc_msg_init                                | 0          | 1          |
| backtrace:tipc_nametbl_init                            | 0          | 1          |
| backtrace:tipc_sk_ref_table_init                       | 0          | 1          |
| backtrace:tipc_socket_init                             | 0          | 1          |
| backtrace:sysctl_net_init                              | 0          | 1          |
| backtrace:init_memory_mapping                          | 0          | 1          |
| backtrace:profile_init                                 | 0          | 1          |
| backtrace:zone_wait_table_init                         | 0          | 1          |
| backtrace:pcrypt_init_padata                           | 0          | 1          |
| backtrace:run_init_process                             | 0          | 2          |
| backtrace:try_to_run_init_process                      | 0          | 2          |
| backtrace:init_linuxrc                                 | 0          | 2          |
| backtrace:kvm_vcpu_init                                | 0          | 2          |
| backtrace:kvm_init                                     | 0          | 2          |
| backtrace:kvm_gfn_to_hva_cache_init                    | 0          | 2          |
| backtrace:kvm_ioapic_init                              | 0          | 2          |
| backtrace:kvm_coalesced_mmio_init                      | 0          | 2          |
| backtrace:kvm_eventfd_init                             | 0          | 2          |
| backtrace:kvm_irqfd_init                               | 0          | 2          |
| backtrace:kvm_vfio_ops_init                            | 0          | 2          |
| backtrace:kvm_async_pf_init                            | 0          | 2          |
| backtrace:kvm_async_pf_vcpu_init                       | 0          | 2          |
| backtrace:init_emulate_ctxt                            | 0          | 2          |
| backtrace:kvm_timer_init                               | 0          | 2          |
| backtrace:fx_init                                      | 0          | 2          |
| backtrace:kvm_arch_init                                | 0          | 2          |
| backtrace:kvm_arch_vcpu_init                           | 0          | 2          |
| backtrace:kvm_arch_init_vm                             | 0          | 2          |
| backtrace:shadow_walk_init                             | 0          | 2          |
+--------------------------------------------------------+------------+------------+


[    5.251562] random: trinity urandom read with 7 bits of entropy available
[   15.332185] sock: process `trinity-main' is using obsolete setsockopt SO_BSDCOMPAT
[   16.288125] ------------[ cut here ]------------
[   16.290326] WARNING: CPU: 0 PID: 1795 at kernel/trace/ftrace.c:2033 ftrace_get_addr_new+0x6e/0xb6()
[   16.294978] Modules linked in:
[   16.296969] CPU: 0 PID: 1795 Comm: trinity-main Not tainted 3.18.0-rc4-wl-g55fe5ef #1
[   16.300668] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.303231]  0000000000000009 ffff88001025fbe8 ffffffff819ef520 00000000000033e2
[   16.307863]  0000000000000000 ffff88001025fc28 ffffffff810e6d54 0000000000000000
[   16.312524]  ffffffff81164804 ffffffff8205e000 ffff880013700000 ffffffff810001c8
[   16.317320] Call Trace:
[   16.318874]  [<ffffffff819ef520>] dump_stack+0x4e/0x68
[   16.321334]  [<ffffffff810e6d54>] warn_slowpath_common+0x81/0x9b
[   16.324410]  [<ffffffff81164804>] ? ftrace_get_addr_new+0x6e/0xb6
[   16.326934]  [<ffffffff810001c8>] ? 0xffffffff810001c8
[   16.329336]  [<ffffffff810e6e11>] warn_slowpath_null+0x1a/0x1c
[   16.331850]  [<ffffffff81164804>] ftrace_get_addr_new+0x6e/0xb6
[   16.334488]  [<ffffffff81064ec9>] ftrace_replace_code+0xda/0x330
[   16.337164]  [<ffffffff8116520a>] ftrace_modify_all_code+0x44/0xcf
[   16.339768]  [<ffffffff8106512f>] arch_ftrace_update_code+0x10/0x19
[   16.342442]  [<ffffffff81165695>] ftrace_run_update_code+0x21/0x42
[   16.345128]  [<ffffffff811656e8>] ftrace_startup_enable+0x32/0x34
[   16.347724]  [<ffffffff8116583d>] ftrace_startup+0x153/0x166
[   16.350306]  [<ffffffff8116589f>] register_ftrace_function+0x4f/0x68
[   16.352935]  [<ffffffff8117e28c>] perf_ftrace_event_register+0x3e/0xf2
[   16.355626]  [<ffffffff8117e10a>] perf_trace_init+0x256/0x28a
[   16.358275]  [<ffffffff8118bf49>] perf_tp_event_init+0x27/0x3a
[   16.360813]  [<ffffffff811923b5>] perf_init_event+0xc6/0xfd
[   16.363320]  [<ffffffff81192699>] perf_event_alloc+0x2ad/0x336
[   16.365990]  [<ffffffff81192e5b>] SyS_perf_event_open+0x42b/0x97d
[   16.368650]  [<ffffffff811c5a00>] ? do_brk+0x175/0x267
[   16.370981]  [<ffffffff819f8b89>] ia32_do_call+0x13/0x13
[   16.373447] ---[ end trace 15858d6d5a0d0548 ]---
[   16.375508] Bad trampoline accounting at: ffffffff810001c8 (run_init_process+0x0/0x2d) (10000001)

View attachment ".dmesg" of type "text/plain" (36264 bytes)

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