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linux/kernel/trace
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Vladimir Riabchun a1dd0abd74 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>
History 2025-12-07 06:12:27 +09:00
..
rv rv: Update rv_en(dis)able_monitor doc to match kernel-doc 2024-06-12 11:03:52 +02:00
blktrace.c trace/blktrace: fix memory leak with using debugfs_lookup() 2023-03-10 09:33:46 +01:00
bpf_trace.c bpf: Remove migrate_disable in kprobe_multi_link_prog_run 2025-10-15 11:56:26 +02:00
bpf_trace.h bpf: Use dedicated bpf_trace_printk event instead of trace_printk() 2020-07-13 16:55:49 -07:00
error_report-traces.c tracing: add error_report_end trace point 2021-02-26 09:41:02 -08:00
fgraph.c arm64 fixes for 5.19-rc1: 2022-06-03 14:05:34 -07:00
fprobe.c fprobe: Fix to ensure the number of active retprobes is not zero 2023-10-25 12:03:12 +02:00
ftrace.c ftrace: Fix softlockup in ftrace_module_enable 2025-12-07 06:12:27 +09:00
ftrace_internal.h x86/ftrace: Have ftrace trampolines turn read-only at the end of system boot up 2020-05-12 18:24:34 -04:00
Kconfig tracing: Build event generation tests only as modules 2024-06-27 13:46:18 +02:00
kprobe_event_gen_test.c tracing: Fix wrong return in kprobe_event_gen_test.c 2023-04-06 12:10:41 +02:00
Makefile rv: Add Runtime Verification (RV) interface 2022-07-30 14:01:28 -04:00
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 tracing: Create a sparse bitmask for pid filtering 2021-10-05 17:38:45 -04:00
power-traces.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
preemptirq_delay_test.c minmax: make generic MIN() and MAX() macros available everywhere 2025-10-02 13:40:43 +02:00
rethook.c rethook: Use __rcu pointer for rethook::handler 2023-12-13 18:39:17 +01:00
ring_buffer.c ring-buffer: Fix bytes_dropped calculation issue 2025-04-10 14:33:37 +02:00
ring_buffer_benchmark.c sched,tracing: Convert to sched_set_fifo() 2020-07-29 11:43:53 +02:00
rpm-traces.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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.c tracing: Silence warning when chunk allocation fails in trace_pid_write 2025-09-19 16:29:56 +02:00
trace.h tracing: Limit access to parser->buffer when trace_get_user failed 2025-08-28 16:26:16 +02:00
trace_benchmark.c tracing: Add numeric delta time to the trace event benchmark 2022-09-26 13:01:09 -04:00
trace_benchmark.h tracing: Add numeric delta time to the trace event benchmark 2022-09-26 13:01:09 -04:00
trace_boot.c tracing: Initialize integer variable to prevent garbage return value 2022-05-26 21:13:00 -04:00
trace_branch.c tracing: Merge irqflags + preempt counter. 2021-02-02 17:02:06 -05:00
trace_clock.c tracing: Use atomic64_inc_return() in trace_clock_counter() 2024-12-14 19:54:45 +01:00
trace_dynevent.c tracing: dynevent: Add a missing lockdown check on dynevent 2025-10-02 13:40:40 +02:00
trace_dynevent.h tracing: probes: Fix a possible race in trace_probe_log APIs 2025-05-22 14:09:59 +02:00
trace_entries.h trace: Add timerlat tracer 2021-06-25 19:57:24 -04:00
trace_eprobe.c tracing/eprobe: Fix to release eprobe when failed to add dyn_event 2024-12-14 19:54:50 +01:00
trace_event_perf.c trace/trace_event_perf: remove duplicate samples on the first tracepoint event 2024-12-14 19:53:35 +01:00
trace_events.c tracing: Add down_write(trace_event_sem) when adding trace event 2025-07-24 08:51:48 +02:00
trace_events_filter.c tracing: Fix filter string testing 2025-04-25 10:43:55 +02:00
trace_events_filter_test.h tracing: Fix SPDX format headers to use C++ style comments 2018-08-16 19:08:06 -04:00
trace_events_hist.c tracing: Rename event_trigger_alloc() to trigger_data_alloc() 2025-06-27 11:07:10 +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: Do not add length to print format in synthetic events 2025-09-19 16:29:55 +02:00
trace_events_trigger.c tracing: Fix error handling in event_trigger_parse() 2025-06-27 11:07:10 +01:00
trace_events_user.c tracing/user_events: Fix struct arg size match check 2023-07-23 13:49:47 +02:00
trace_export.c tracing: Fix TASK_COMM_LEN in trace event format file 2023-02-14 19:11:54 +01:00
trace_functions.c ftrace: Fix preemption accounting for stacktrace filter command 2025-05-22 14:10:05 +02:00
trace_functions_graph.c tracing: Fix use-after-free in print_graph_function_flags during tracer switching 2025-04-10 14:33:43 +02:00
trace_hwlat.c tracing/hwlat: Fix a race during cpuhp processing 2024-10-17 15:22:02 +02:00
trace_irqsoff.c tracing: Fix use-after-free in print_graph_function_flags during tracer switching 2025-04-10 14:33:43 +02:00
trace_kdb.c kdb: Rename members of struct kdbtab_t 2021-07-27 17:05:06 +01:00
trace_kprobe.c tracing: Fix race condition in kprobe initialization causing NULL pointer dereference 2025-10-19 16:23:20 +02:00
trace_kprobe_selftest.c selftest/ftrace: Move kprobe selftest function to separate compile unit 2018-07-30 18:41:04 -04:00
trace_kprobe_selftest.h tracing: Fix SPDX format headers to use C++ style comments 2018-08-16 19:08:06 -04:00
trace_mmiotrace.c tracing: Remove definition of DEBUG in trace_mmiotrace.c 2021-02-02 17:02:07 -05:00
trace_nop.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_osnoise.c tracing/osnoise: Fix possible recursive locking for cpus_read_lock() 2025-04-10 14:33:43 +02:00
trace_output.c tracing: Remove precision vsnprintf() check from print event 2024-10-17 15:22:10 +02:00
trace_output.h ftrace: Add recording of functions that caused recursion 2020-11-06 08:42:26 -05:00
trace_preemptirq.c tracing: hold caller_addr to hardirq_{enable,disable}_ip 2022-09-06 22:26:00 -04:00
trace_printk.c tracing: Disable "other" permission bits in the tracefs files 2021-10-08 18:08:43 -04:00
trace_probe.c tracing: probes: Fix a possible race in trace_probe_log APIs 2025-05-22 14:09:59 +02:00
trace_probe.h tracing: Fix race condition in kprobe initialization causing NULL pointer dereference 2025-10-19 16:23:20 +02:00
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_recursion_record.c tracing: Use trace_create_file() to simplify creation of tracefs entries 2022-05-26 21:12:52 -04:00
trace_sched_switch.c sched/tracing: Append prev_state to tp args instead 2022-05-12 00:37:11 +02:00
trace_sched_wakeup.c tracing: Fix use-after-free in print_graph_function_flags during tracer switching 2025-04-10 14:33:43 +02:00
trace_selftest.c tracing: Reset the function filter after completing trampoline/graph selftest 2022-05-25 16:57:37 -04:00
trace_selftest_dynamic.c ftrace: Mark function tracer test functions noinline/noclone 2018-01-23 15:57:29 -05:00
trace_seq.c tracing: Fix various typos in comments 2021-03-23 14:08:18 -04:00
trace_stack.c tracing: Disable "other" permission bits in the tracefs files 2021-10-08 18:08:43 -04:00
trace_stat.c tracing: Disable "other" permission bits in the tracefs files 2021-10-08 18:08:43 -04:00
trace_stat.h tracing: Use generic type for comparator function 2019-11-14 13:15:11 -05:00
trace_synth.h tracing: Allow synthetic events to pass around stacktraces 2023-08-03 10:23:55 +02:00
trace_syscalls.c tracing/ftrace: disable preemption in syscall probe 2024-12-14 19:54:45 +01:00
trace_uprobe.c tracing: Fix race condition in kprobe initialization causing NULL pointer dereference 2025-10-19 16:23:20 +02:00
tracing_map.c tracing: Fix cmp_entries_dup() to respect sort() comparison rules 2024-12-14 19:54:32 +01:00
tracing_map.h tracing: Fix some typos in comments 2020-11-10 20:39:40 -05:00