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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-05-23 19:50:34 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-05-25 23:04:43 -0400 |
| commit | b6399cc789341fc49a0603fb7d388a4e50aca212 (patch) | |
| tree | 95b2bfe054e5dfd2e9d088ee8f0d74be2b6ebdd2 /kernel | |
| parent | b3015fe41d9af7515a7b7b6f7f8f172d193fb3a6 (diff) | |
| download | linux-0-day-b6399cc789341fc49a0603fb7d388a4e50aca212.tar.gz linux-0-day-b6399cc789341fc49a0603fb7d388a4e50aca212.tar.xz | |
tracing/kprobe: Do not run kprobe boot tests if kprobe_event is on cmdline
When having kprobe trace event start up tests enabled and adding a
kprobe_event on the kernel command line, it produced the following:
trace_kprobe: Testing kprobe tracing:
WARNING: CPU: 5 PID: 1 at kernel/trace/trace_kprobe.c:1724 kprobe_trace_self_tests_init+0x32d/0x36b
Modules linked in:
CPU: 5 PID: 1 Comm: swapper/0 Not tainted 5.2.0-rc1-test+ #249
Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 07/14/2016
RIP: 0010:kprobe_trace_self_tests_init+0x32d/0x36b
Code: b7 e8 4f 8d a2 fe 85 c0 74 10 0f 0b 48 c7 c7 c8 1b 0d b7 ff c3 e8 19 af 99 fe 48 c7 c7 40 93 27 b7 e8 7f 1a a5 fe 85 c0 74 10 <0f> 0b 48 c7 c7 f8 1b 0d b7 ff c3 e8 f9 ae
9 a0 fe 85
RSP: 0018:ffffb36e40653e08 EFLAGS: 00010286
RAX: 00000000fffffff0 RBX: 0000000000000000 RCX: ffffb36e40653d5c
RDX: 0000000000000000 RSI: ffffffffb72776e0 RDI: 0000000000000246
RBP: ffff98414fe58ff8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff98415d8aa940 R12: 0000000000000000
R13: ffffffffb737c1b0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff98415ea80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f959ce741b8 CR3: 000000011a210002 CR4: 00000000001606e0
Call Trace:
? init_kprobe_trace+0x19e/0x19e
? do_early_param+0x8e/0x8e
do_one_initcall+0x6f/0x2b4
? do_early_param+0x8e/0x8e
kernel_init_freeable+0x21d/0x2c6
? rest_init+0x146/0x146
kernel_init+0xa/0x10a
ret_from_fork+0x3a/0x50
---[ end trace 488430c083a4c956 ]---
As with the trace events, if a trace event is set on the kernel command
line, the trace events start up tests are suspended. The kprobe start up
tests should do the same when a kprobe is enabled on the kernel command
line.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 004fffd24ec19..7958da2fd922b 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -25,6 +25,7 @@ /* Kprobe early definition from command line */ static char kprobe_boot_events_buf[COMMAND_LINE_SIZE] __initdata; +static bool kprobe_boot_events_enabled __initdata; static int __init set_kprobe_boot_events(char *str) { @@ -1538,6 +1539,8 @@ static __init void setup_boot_kprobe_events(void) ret = trace_run_command(cmd, create_or_delete_trace_kprobe); if (ret) pr_warn("Failed to add event(%d): %s\n", ret, cmd); + else + kprobe_boot_events_enabled = true; cmd = p; } @@ -1611,6 +1614,11 @@ static __init int kprobe_trace_self_tests_init(void) if (tracing_is_disabled()) return -ENODEV; + if (kprobe_boot_events_enabled) { + pr_info("Skipping kprobe tests due to kprobe_event on cmdline\n"); + return 0; + } + target = kprobe_trace_selftest_target; pr_info("Testing kprobe tracing: "); |