Yang Shi 6e22c83664 tracing, kasan: Silence Kasan warning in check_stack of stack_tracer ... When enabling stack trace via "echo 1 > /proc/sys/kernel/stack_tracer_enabled", the below KASAN warning is triggered: BUG: KASAN: stack-out-of-bounds in check_stack+0x344/0x848 at addr ffffffc0689ebab8 Read of size 8 by task ksoftirqd/4/29 page:ffffffbdc3a27ac0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x0() page dumped because: kasan: bad access detected CPU: 4 PID: 29 Comm: ksoftirqd/4 Not tainted 4.5.0-rc1 #129 Hardware name: Freescale Layerscape 2085a RDB Board (DT) Call trace: [<ffffffc000091300>] dump_backtrace+0x0/0x3a0 [<ffffffc0000916c4>] show_stack+0x24/0x30 [<ffffffc0009bbd78>] dump_stack+0xd8/0x168 [<ffffffc000420bb0>] kasan_report_error+0x6a0/0x920 [<ffffffc000421688>] kasan_report+0x70/0xb8 [<ffffffc00041f7f0>] __asan_load8+0x60/0x78 [<ffffffc0002e05c4>] check_stack+0x344/0x848 [<ffffffc0002e0c8c>] stack_trace_call+0x1c4/0x370 [<ffffffc0002af558>] ftrace_ops_no_ops+0x2c0/0x590 [<ffffffc00009f25c>] ftrace_graph_call+0x0/0x14 [<ffffffc0000881bc>] fpsimd_thread_switch+0x24/0x1e8 [<ffffffc000089864>] __switch_to+0x34/0x218 [<ffffffc0011e089c>] __schedule+0x3ac/0x15b8 [<ffffffc0011e1f6c>] schedule+0x5c/0x178 [<ffffffc0001632a8>] smpboot_thread_fn+0x350/0x960 [<ffffffc00015b518>] kthread+0x1d8/0x2b0 [<ffffffc0000874d0>] ret_from_fork+0x10/0x40 Memory state around the buggy address: ffffffc0689eb980: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f4 f4 f4 ffffffc0689eba00: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffc0689eba80: 00 00 f1 f1 f1 f1 00 f4 f4 f4 f3 f3 f3 f3 00 00 ^ ffffffc0689ebb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffc0689ebb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 The stacker tracer traverses the whole kernel stack when saving the max stack trace. It may touch the stack red zones to cause the warning. So, just disable the instrumentation to silence the warning. Link: http://lkml.kernel.org/r/1455309960-18930-1-git-send-email-yang.shi@linaro.org Signed-off-by: Yang Shi <yang.shi@linaro.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>		2016-02-19 12:36:44 -05:00
..
blktrace.c	convert a bunch of open-coded instances of memdup_user_nul()	2016-01-04 10:26:58 -05:00
bpf_trace.c	perf/bpf: Convert perf_event_array to use struct file	2016-01-29 08:35:25 +01:00
ftrace.c	ftrace: Fix the race between ftrace and insmod	2016-01-07 15:56:21 -05:00
Kconfig	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-11-10 18:11:41 -08:00
Makefile
power-traces.c
ring_buffer_benchmark.c	ring_buffer: Remove unneeded smp_wmb() before wakeup of reader benchmark	2015-11-03 16:19:02 -05:00
ring_buffer.c	ring-buffer: Process commits whenever moving to a new page.	2015-11-25 15:24:05 -05:00
rpm-traces.c
trace_benchmark.c
trace_benchmark.h
trace_branch.c
trace_clock.c
trace_entries.h
trace_event_perf.c	Not much new with tracing for this release. Mostly just clean ups and	2016-01-12 20:04:15 -08:00
trace_events_filter_test.h
trace_events_filter.c
trace_events_trigger.c	Not much new with tracing for this release. Mostly just clean ups and	2016-01-12 20:04:15 -08:00
trace_events.c	kernel/*: switch to memdup_user_nul()	2016-01-04 10:27:55 -05:00
trace_export.c
trace_functions_graph.c	tracing: Remove unused ftrace_cpu_disabled per cpu variable	2015-11-07 13:25:14 -05:00
trace_functions.c
trace_irqsoff.c
trace_kdb.c
trace_kprobe.c
trace_mmiotrace.c
trace_nop.c
trace_output.c
trace_output.h
trace_printk.c	tracing: Fix setting of start_index in find_next()	2016-01-04 15:22:47 -05:00
trace_probe.c
trace_probe.h
trace_sched_switch.c
trace_sched_wakeup.c	Most of the changes are clean ups and small fixes. Some of them have	2015-11-06 13:30:20 -08:00
trace_selftest_dynamic.c
trace_selftest.c
trace_seq.c
trace_stack.c	tracing, kasan: Silence Kasan warning in check_stack of stack_tracer	2016-02-19 12:36:44 -05:00
trace_stat.c
trace_stat.h
trace_syscalls.c
trace_uprobe.c
trace.c	tracing: Fix stacktrace skip depth in trace_buffer_unlock_commit_regs()	2016-01-14 09:28:19 -05:00
trace.h	tracing: Fix comment to use tracing_on over tracing_enable	2015-12-23 14:27:25 -05:00