tracing: Disable ftrace selftests when any tracer is running
Disable ftrace selftests when any tracer (kernel command line options
like ftrace=, trace_events=, kprobe_events=, and boot-time tracing)
starts running because selftest can disturb it.
Currently ftrace= and trace_events= are checked, but kprobe_events
has a different flag, and boot-time tracing didn't checked. This unifies
the disabled flag and all of those boot-time tracing features sets
the flag.
This also fixes warnings on kprobe-event selftest
(CONFIG_FTRACE_STARTUP_TEST=y and CONFIG_KPROBE_EVENTS=y) with boot-time
tracing (ftrace.event.kprobes.EVENT.probes) like below;
[ 59.803496] trace_kprobe: Testing kprobe tracing:
[ 59.804258] ------------[ cut here ]------------
[ 59.805682] WARNING: CPU: 3 PID: 1 at kernel/trace/trace_kprobe.c:1987 kprobe_trace_self_tests_ib
[ 59.806944] Modules linked in:
[ 59.807335] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 5.10.0-rc7+ #172
[ 59.808029] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/204
[ 59.808999] RIP: 0010:kprobe_trace_self_tests_init+0x5f/0x42b
[ 59.809696] Code: e8 03 00 00 48 c7 c7 30 8e 07 82 e8 6d 3c 46 ff 48 c7 c6 00 b2 1a 81 48 c7 c7 7
[ 59.812439] RSP: 0018:ffffc90000013e78 EFLAGS: 00010282
[ 59.813038] RAX: 00000000ffffffef RBX: 0000000000000000 RCX: 0000000000049443
[ 59.813780] RDX: 0000000000049403 RSI: 0000000000049403 RDI: 000000000002deb0
[ 59.814589] RBP: ffffc90000013e90 R08: 0000000000000001 R09: 0000000000000001
[ 59.815349] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000ffffffef
[ 59.816138] R13: ffff888004613d80 R14: ffffffff82696940 R15: ffff888004429138
[ 59.816877] FS: 0000000000000000(0000) GS:ffff88807dcc0000(0000) knlGS:0000000000000000
[ 59.817772] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 59.818395] CR2: 0000000001a8dd38 CR3: 0000000002222000 CR4: 00000000000006a0
[ 59.819144] Call Trace:
[ 59.819469] ? init_kprobe_trace+0x6b/0x6b
[ 59.819948] do_one_initcall+0x5f/0x300
[ 59.820392] ? rcu_read_lock_sched_held+0x4f/0x80
[ 59.820916] kernel_init_freeable+0x22a/0x271
[ 59.821416] ? rest_init+0x241/0x241
[ 59.821841] kernel_init+0xe/0x10f
[ 59.822251] ret_from_fork+0x22/0x30
[ 59.822683] irq event stamp: 16403349
[ 59.823121] hardirqs last enabled at (16403359): [<ffffffff810db81e>] console_unlock+0x48e/0x580
[ 59.824074] hardirqs last disabled at (16403368): [<ffffffff810db786>] console_unlock+0x3f6/0x580
[ 59.825036] softirqs last enabled at (16403200): [<ffffffff81c0033a>] __do_softirq+0x33a/0x484
[ 59.825982] softirqs last disabled at (16403087): [<ffffffff81a00f02>] asm_call_irq_on_stack+0x10
[ 59.827034] ---[ end trace 200c544775cdfeb3 ]---
[ 59.827635] trace_kprobe: error on probing function entry.
Link: https://lkml.kernel.org/r/160741764955.3448999.3347769358299456915.stgit@devnote2
Fixes: 4d655281eb ("tracing/boot Add kprobe event support")
Cc: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
Steven Rostedt (VMware)
parent
d9a9280a0d
commit
60efe21e59
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@ -68,10 +68,21 @@ bool ring_buffer_expanded;
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static bool __read_mostly tracing_selftest_running;
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/*
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* If a tracer is running, we do not want to run SELFTEST.
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* If boot-time tracing including tracers/events via kernel cmdline
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* is running, we do not want to run SELFTEST.
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*/
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bool __read_mostly tracing_selftest_disabled;
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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void __init disable_tracing_selftest(const char *reason)
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{
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if (!tracing_selftest_disabled) {
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tracing_selftest_disabled = true;
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pr_info("Ftrace startup test is disabled due to %s\n", reason);
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}
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}
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#endif
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/* Pipe tracepoints to printk */
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struct trace_iterator *tracepoint_print_iter;
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int tracepoint_printk;
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@ -2112,11 +2123,7 @@ int __init register_tracer(struct tracer *type)
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apply_trace_boot_options();
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/* disable other selftests, since this will break it. */
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tracing_selftest_disabled = true;
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n",
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type->name);
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#endif
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disable_tracing_selftest("running a tracer");
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out_unlock:
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return ret;
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@ -719,6 +719,8 @@ extern bool ring_buffer_expanded;
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extern bool tracing_selftest_disabled;
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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extern void __init disable_tracing_selftest(const char *reason);
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extern int trace_selftest_startup_function(struct tracer *trace,
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struct trace_array *tr);
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extern int trace_selftest_startup_function_graph(struct tracer *trace,
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@ -742,6 +744,9 @@ extern int trace_selftest_startup_branch(struct tracer *trace,
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*/
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#define __tracer_data __refdata
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#else
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static inline void __init disable_tracing_selftest(const char *reason)
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{
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}
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/* Tracers are seldom changed. Optimize when selftests are disabled. */
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#define __tracer_data __read_mostly
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#endif /* CONFIG_FTRACE_STARTUP_TEST */
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@ -344,6 +344,8 @@ static int __init trace_boot_init(void)
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trace_boot_init_one_instance(tr, trace_node);
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trace_boot_init_instances(trace_node);
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disable_tracing_selftest("running boot-time tracing");
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return 0;
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}
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/*
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@ -3201,7 +3201,7 @@ static __init int setup_trace_event(char *str)
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{
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strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
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ring_buffer_expanded = true;
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tracing_selftest_disabled = true;
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disable_tracing_selftest("running event tracing");
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return 1;
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}
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@ -25,11 +25,12 @@
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/* Kprobe early definition from command line */
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static char kprobe_boot_events_buf[COMMAND_LINE_SIZE] __initdata;
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static bool kprobe_boot_events_enabled __initdata;
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static int __init set_kprobe_boot_events(char *str)
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{
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strlcpy(kprobe_boot_events_buf, str, COMMAND_LINE_SIZE);
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disable_tracing_selftest("running kprobe events");
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return 0;
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}
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__setup("kprobe_event=", set_kprobe_boot_events);
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@ -1887,8 +1888,6 @@ static __init void setup_boot_kprobe_events(void)
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ret = trace_run_command(cmd, create_or_delete_trace_kprobe);
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if (ret)
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pr_warn("Failed to add event(%d): %s\n", ret, cmd);
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else
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kprobe_boot_events_enabled = true;
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cmd = p;
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}
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@ -1973,10 +1972,8 @@ static __init int kprobe_trace_self_tests_init(void)
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if (tracing_is_disabled())
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return -ENODEV;
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if (kprobe_boot_events_enabled) {
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pr_info("Skipping kprobe tests due to kprobe_event on cmdline\n");
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if (tracing_selftest_disabled)
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return 0;
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}
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target = kprobe_trace_selftest_target;
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@ -786,7 +786,7 @@ trace_selftest_startup_function_graph(struct tracer *trace,
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/* Have we just recovered from a hang? */
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if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) {
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tracing_selftest_disabled = true;
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disable_tracing_selftest("recovering from a hang");
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ret = -1;
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goto out;
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}
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