Luo Haiyang 03474a01c1 tracing: Fix potential deadlock in cpu hotplug with osnoise ...

[ Upstream commit 1f98857322 ]

The following sequence may leads deadlock in cpu hotplug:

    task1        task2        task3
    -----        -----        -----

 mutex_lock(&interface_lock)

            [CPU GOING OFFLINE]

            cpus_write_lock();
            osnoise_cpu_die();
              kthread_stop(task3);
                wait_for_completion();

                      osnoise_sleep();
                        mutex_lock(&interface_lock);

 cpus_read_lock();

 [DEAD LOCK]

Fix by swap the order of cpus_read_lock() and mutex_lock(&interface_lock).

Cc: stable@vger.kernel.org
Cc: <mathieu.desnoyers@efficios.com>
Cc: <zhang.run@zte.com.cn>
Cc: <yang.tao172@zte.com.cn>
Cc: <ran.xiaokai@zte.com.cn>
Fixes: bce29ac9ce ("trace: Add osnoise tracer")
Link: https://patch.msgid.link/20260326141953414bVSj33dAYktqp9Oiyizq8@zte.com.cn
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Luo Haiyang <luo.haiyang@zte.com.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2026-04-02 13:09:49 +02:00

..

rv

…

blktrace.c

…

bpf_trace.c

bpf: Remove migrate_disable in kprobe_multi_link_prog_run

2025-10-15 11:59:56 +02:00

bpf_trace.h

…

error_report-traces.c

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fgraph.c

fgraph: Do not call handlers direct when not using ftrace_ops

2026-03-04 07:21:59 -05:00

fprobe.c

…

ftrace_internal.h

…

ftrace.c

kallsyms/ftrace: set module buildid in ftrace_mod_address_lookup()

2026-03-04 07:20:02 -05:00

Kconfig

fgraph: Replace fgraph_ret_regs with ftrace_regs

2026-03-04 07:19:36 -05:00

kprobe_event_gen_test.c

…

Makefile

…

pid_list.c

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pid_list.h

…

power-traces.c

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preemptirq_delay_test.c

kernel: trace: preemptirq_delay_test: use offstack cpu mask

2025-08-15 12:13:53 +02:00

rethook.c

…

ring_buffer_benchmark.c

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ring_buffer.c

ring-buffer: Fix to update per-subbuf entries of persistent ring buffer

2026-03-25 11:08:56 +01:00

rpm-traces.c

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synth_event_gen_test.c

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trace_benchmark.c

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trace_benchmark.h

…

trace_boot.c

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trace_branch.c

…

trace_btf.c

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trace_btf.h

…

trace_clock.c

…

trace_dynevent.c

tracing: dynevent: Add a missing lockdown check on dynevent

2025-10-02 13:44:13 +02:00

trace_dynevent.h

tracing: probes: Fix a possible race in trace_probe_log APIs

2025-05-22 14:29:36 +02:00

trace_entries.h

tracing: Fix ftrace event field alignments

2026-02-11 13:40:18 +01:00

trace_eprobe.c

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trace_event_perf.c

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trace_events_filter_test.h

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trace_events_filter.c

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trace_events_hist.c

tracing: Fix checking of freed trace_event_file for hist files

2026-03-04 07:21:59 -05:00

trace_events_inject.c

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trace_events_synth.c

tracing: Fix crash on synthetic stacktrace field usage

2026-01-30 10:28:46 +01:00

trace_events_trigger.c

tracing: Add NULL pointer check to trigger_data_free()

2026-03-13 17:20:47 +01:00

trace_events_user.c

…

trace_events.c

tracing: Fix enabling multiple events on the kernel command line and bootconfig

2026-03-25 11:08:37 +01:00

trace_export.c

tracing: Fix ftrace event field alignments

2026-02-11 13:40:18 +01:00

trace_fprobe.c

tracing: Fix race condition in kprobe initialization causing NULL pointer dereference

2025-10-19 16:34:01 +02:00

trace_functions_graph.c

fgraph: Fix thresh_return clear per-task notrace

2026-03-25 11:08:43 +01:00

trace_functions.c

ftrace: Fix preemption accounting for stacktrace filter command

2025-05-22 14:29:48 +02:00

trace_hwlat.c

tracing: Fix false sharing in hwlat get_sample()

2026-03-04 07:21:21 -05:00

trace_irqsoff.c

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trace_kdb.c

ring-buffer: Remove ring_buffer_read_prepare_sync()

2025-08-15 12:13:46 +02:00

trace_kprobe_selftest.c

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trace_kprobe_selftest.h

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trace_kprobe.c

tracing: Fix race condition in kprobe initialization causing NULL pointer dereference

2025-10-19 16:34:01 +02:00

trace_mmiotrace.c

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trace_nop.c

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trace_osnoise.c

tracing: Fix potential deadlock in cpu hotplug with osnoise

2026-04-02 13:09:49 +02:00

trace_output.c

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trace_output.h

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trace_preemptirq.c

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trace_printk.c

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trace_probe_kernel.h

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trace_probe_tmpl.h

…

trace_probe.c

tracing/probes: Avoid using params uninitialized in parse_btf_arg()

2025-07-24 08:56:22 +02:00

trace_probe.h

tracing: Fix race condition in kprobe initialization causing NULL pointer dereference

2025-10-19 16:34:01 +02:00

trace_recursion_record.c

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trace_sched_switch.c

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trace_sched_wakeup.c

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trace_selftest_dynamic.c

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trace_selftest.c

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trace_seq.c

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trace_stack.c

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trace_stat.c

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trace_stat.h

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trace_synth.h

…

trace_syscalls.c

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trace_uprobe.c

tracing: Fix race condition in kprobe initialization causing NULL pointer dereference

2025-10-19 16:34:01 +02:00

trace.c

tracing: Add recursion protection in kernel stack trace recording

2026-03-25 11:08:44 +01:00

trace.h

tracing: Fix ftrace event field alignments

2026-02-11 13:40:18 +01:00

tracing_map.c

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tracing_map.h

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