Vladimir Riabchun 40c8ee40e4 ftrace: Fix softlockup in ftrace_module_enable ...

[ Upstream commit 4099b98203 ]

A soft lockup was observed when loading amdgpu module.
If a module has a lot of tracable functions, multiple calls
to kallsyms_lookup can spend too much time in RCU critical
section and with disabled preemption, causing kernel panic.
This is the same issue that was fixed in
commit d0b24b4e91 ("ftrace: Prevent RCU stall on PREEMPT_VOLUNTARY
kernels") and commit 42ea22e754 ("ftrace: Add cond_resched() to
ftrace_graph_set_hash()").

Fix it the same way by adding cond_resched() in ftrace_module_enable.

Link: https://lore.kernel.org/aMQD9_lxYmphT-up@vova-pc
Signed-off-by: Vladimir Riabchun <ferr.lambarginio@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2025-11-13 15:34:32 -05:00

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rv

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blktrace.c

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bpf_trace.c

bpf: Remove migrate_disable in kprobe_multi_link_prog_run

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

bpf_trace.h

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error_report-traces.c

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fgraph.c

trace/fgraph: Fix error handling

2025-09-19 16:35:43 +02:00

fprobe.c

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ftrace_internal.h

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ftrace.c

ftrace: Fix softlockup in ftrace_module_enable

2025-11-13 15:34:32 -05:00

Kconfig

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kprobe_event_gen_test.c

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Makefile

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pid_list.c

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pid_list.h

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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

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ring_buffer_benchmark.c

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ring_buffer.c

ring-buffer: Remove ring_buffer_read_prepare_sync()

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

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

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trace_boot.c

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trace_branch.c

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trace_btf.c

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trace_btf.h

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trace_clock.c

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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

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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

tracing: Fix filter string testing

2025-04-25 10:47:55 +02:00

trace_events_hist.c

tracing: Rename event_trigger_alloc() to trigger_data_alloc()

2025-06-19 15:31:48 +02:00

trace_events_inject.c

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trace_events_synth.c

tracing: Do not add length to print format in synthetic events

2025-04-20 10:15:50 +02:00

trace_events_trigger.c

tracing: Fix error handling in event_trigger_parse()

2025-06-19 15:31:48 +02:00

trace_events_user.c

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trace_events.c

tracing: Add down_write(trace_event_sem) when adding trace event

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

trace_export.c

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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

tracing: Fix use-after-free in print_graph_function_flags during tracer switching

2025-04-10 14:39:39 +02:00

trace_functions.c

ftrace: Fix preemption accounting for stacktrace filter command

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

trace_hwlat.c

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trace_irqsoff.c

tracing: Fix use-after-free in print_graph_function_flags during tracer switching

2025-04-10 14:39:39 +02:00

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/osnoise: Fix crash in timerlat_dump_stack()

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

trace_output.c

tracing: Do not take trace_event_sem in print_event_fields()

2025-05-09 09:50:32 +02:00

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

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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

tracing: Fix use-after-free in print_graph_function_flags during tracer switching

2025-04-10 14:39:39 +02:00

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

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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: Silence warning when chunk allocation fails in trace_pid_write

2025-09-19 16:35:44 +02:00

trace.h

tracing: Limit access to parser->buffer when trace_get_user failed

2025-08-28 16:31:10 +02:00

tracing_map.c

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tracing_map.h

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