Zheng Yejian 29d6f70176 tracing: Avoid possible softlockup in tracing_iter_reset() ... commit 49aa8a1f4d6800721c7971ed383078257f12e8f9 upstream. In __tracing_open(), when max latency tracers took place on the cpu, the time start of its buffer would be updated, then event entries with timestamps being earlier than start of the buffer would be skipped (see tracing_iter_reset()). Softlockup will occur if the kernel is non-preemptible and too many entries were skipped in the loop that reset every cpu buffer, so add cond_resched() to avoid it. Cc: stable@vger.kernel.org Fixes: 2f26ebd549 ("tracing: use timestamp to determine start of latency traces") Link: https://lore.kernel.org/20240827124654.3817443-1-zhengyejian@huaweicloud.com Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Zheng Yejian <zhengyejian@huaweicloud.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-09-12 11:10:18 +02:00
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rv	rv: Update rv_en(dis)able_monitor doc to match kernel-doc	2024-06-12 11:03:52 +02:00
blktrace.c
bpf_trace.c	bpf: Remove trace_printk_lock	2024-02-23 09:12:51 +01:00
bpf_trace.h
error_report-traces.c
fgraph.c
fprobe.c	fprobe: Fix to ensure the number of active retprobes is not zero	2023-10-25 12:03:12 +02:00
ftrace_internal.h
ftrace.c	ftrace: Fix possible use-after-free issue in ftrace_location()	2024-06-12 11:02:54 +02:00
Kconfig	tracing: Build event generation tests only as modules	2024-06-27 13:46:18 +02:00
kprobe_event_gen_test.c
Makefile
pid_list.c	trace/pid_list: Change gfp flags in pid_list_fill_irq()	2024-08-03 08:49:34 +02:00
pid_list.h
power-traces.c
preemptirq_delay_test.c	tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test	2024-06-27 13:46:23 +02:00
rethook.c	rethook: Use __rcu pointer for rethook::handler	2023-12-13 18:39:17 +01:00
ring_buffer_benchmark.c
ring_buffer.c	ring-buffer: Fix a race between readers and resize checks	2024-06-12 11:02:56 +02:00
rpm-traces.c
synth_event_gen_test.c	tracing / synthetic: Disable events after testing in synth_event_gen_test_init()	2024-01-01 12:39:07 +00:00
trace_benchmark.c
trace_benchmark.h
trace_boot.c
trace_branch.c
trace_clock.c
trace_dynevent.c
trace_dynevent.h
trace_entries.h
trace_eprobe.c	kernel/trace: Fix cleanup logic of enable_trace_eprobe	2023-07-23 13:49:24 +02:00
trace_event_perf.c
trace_events_filter_test.h
trace_events_filter.c	tracing: Have trace_event_file have ref counters	2023-11-28 17:07:23 +00:00
trace_events_hist.c	tracing: Fix uaf issue when open the hist or hist_debug file	2024-01-20 11:50:07 +01:00
trace_events_inject.c	tracing: Have event inject files inc the trace array ref count	2023-09-23 11:11:11 +02:00
trace_events_synth.c	tracing: Have the user copy of synthetic event address use correct context	2023-11-28 17:07:13 +00:00
trace_events_trigger.c	tracing/trigger: Fix to return error if failed to alloc snapshot	2024-02-23 09:12:32 +01:00
trace_events_user.c	tracing/user_events: Fix struct arg size match check	2023-07-23 13:49:47 +02:00
trace_events.c	tracing: hide unused ftrace_event_id_fops	2024-04-17 11:18:26 +02:00
trace_export.c
trace_functions_graph.c
trace_functions.c
trace_hwlat.c	tracing: Remove extra space at the end of hwlat_detector/mode	2023-09-13 09:42:57 +02:00
trace_irqsoff.c	tracing: Fix memleak due to race between current_tracer and trace	2023-08-30 16:11:00 +02:00
trace_kdb.c
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	tracing/kprobes: Fix symbol counting logic by looking at modules as well	2024-01-05 15:18:40 +01:00
trace_mmiotrace.c
trace_nop.c
trace_osnoise.c
trace_output.c	tracing: Add size check when printing trace_marker output	2024-01-20 11:50:07 +01:00
trace_output.h
trace_preemptirq.c
trace_printk.c
trace_probe_kernel.h	tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails	2023-08-03 10:23:55 +02:00
trace_probe_tmpl.h	tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails	2023-08-03 10:23:55 +02:00
trace_probe.c	Revert "tracing: Add "(fault)" name injection to kernel probes"	2023-08-03 10:23:55 +02:00
trace_probe.h	tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols	2023-10-25 12:03:16 +02:00
trace_recursion_record.c
trace_sched_switch.c
trace_sched_wakeup.c	tracing: Fix memleak due to race between current_tracer and trace	2023-08-30 16:11:00 +02:00
trace_selftest_dynamic.c
trace_selftest.c
trace_seq.c
trace_stack.c
trace_stat.c
trace_stat.h
trace_synth.h	tracing: Allow synthetic events to pass around stacktraces	2023-08-03 10:23:55 +02:00
trace_syscalls.c
trace_uprobe.c	bpf: Clear the probe_addr for uprobe	2023-09-13 09:42:30 +02:00
trace.c	tracing: Avoid possible softlockup in tracing_iter_reset()	2024-09-12 11:10:18 +02:00
trace.h	tracing: Fix uaf issue when open the hist or hist_debug file	2024-01-20 11:50:07 +01:00
tracing_map.c	tracing: Fix overflow in get_free_elt()	2024-08-14 13:52:59 +02:00
tracing_map.h