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Message-ID: <20251114062730.1828416-1-tzungbi@kernel.org>
Date: Fri, 14 Nov 2025 06:27:30 +0000
From: Tzung-Bi Shih <tzungbi@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Will Deacon <will@...nel.org>,
Boqun Feng <boqun.feng@...il.com>
Cc: Waiman Long <longman@...hat.com>,
linux-kernel@...r.kernel.org,
tzungbi@...nel.org
Subject: [PATCH] lockdep: Add header and footer to surround warning reports
Add header and footer to improve log parsing and automated analysis.
This makes lockdep output easier to interpret.
Signed-off-by: Tzung-Bi Shih <tzungbi@...nel.org>
---
kernel/locking/lockdep.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 2d4c5bab5af8..af05d30f1545 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -59,6 +59,7 @@
#include <linux/console.h>
#include <linux/kasan.h>
+#include <asm/bugs.h>
#include <asm/sections.h>
#include "lockdep_internals.h"
@@ -110,6 +111,11 @@ static __init int kernel_lockdep_sysctls_init(void)
late_initcall(kernel_lockdep_sysctls_init);
#endif /* CONFIG_SYSCTL */
+static void print_footer(void)
+{
+ pr_warn("---[ end trace %016llx ]---\n", 0ULL);
+}
+
DEFINE_PER_CPU(unsigned int, lockdep_recursion);
EXPORT_PER_CPU_SYMBOL_GPL(lockdep_recursion);
@@ -1958,6 +1964,7 @@ print_circular_bug_header(struct lock_list *entry, unsigned int depth,
return;
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("======================================================\n");
pr_warn("WARNING: possible circular locking dependency detected\n");
print_kernel_ident();
@@ -2041,6 +2048,7 @@ static noinline void print_circular_bug(struct lock_list *this,
printk("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -2561,6 +2569,7 @@ print_bad_irq_dependency(struct task_struct *curr,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("=====================================================\n");
pr_warn("WARNING: %s-safe -> %s-unsafe lock order detected\n",
irqclass, irqclass);
@@ -2614,6 +2623,7 @@ print_bad_irq_dependency(struct task_struct *curr,
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
out:
nbcon_cpu_emergency_exit();
}
@@ -3018,6 +3028,7 @@ print_deadlock_bug(struct task_struct *curr, struct held_lock *prev,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("============================================\n");
pr_warn("WARNING: possible recursive locking detected\n");
print_kernel_ident();
@@ -3039,6 +3050,7 @@ print_deadlock_bug(struct task_struct *curr, struct held_lock *prev,
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -3641,6 +3653,7 @@ static void print_collision(struct task_struct *curr,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("============================\n");
pr_warn("WARNING: chain_key collision\n");
print_kernel_ident();
@@ -3656,6 +3669,7 @@ static void print_collision(struct task_struct *curr,
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -4013,6 +4027,7 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("================================\n");
pr_warn("WARNING: inconsistent lock state\n");
print_kernel_ident();
@@ -4040,6 +4055,7 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this,
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -4079,6 +4095,7 @@ print_irq_inversion_bug(struct task_struct *curr,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("========================================================\n");
pr_warn("WARNING: possible irq lock inversion dependency detected\n");
print_kernel_ident();
@@ -4123,6 +4140,7 @@ print_irq_inversion_bug(struct task_struct *curr,
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
out:
nbcon_cpu_emergency_exit();
}
@@ -4811,6 +4829,7 @@ print_lock_invalid_wait_context(struct task_struct *curr,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("=============================\n");
pr_warn("[ BUG: Invalid wait context ]\n");
print_kernel_ident();
@@ -4828,6 +4847,7 @@ print_lock_invalid_wait_context(struct task_struct *curr,
pr_warn("stack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
@@ -5041,6 +5061,7 @@ print_lock_nested_lock_not_held(struct task_struct *curr,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("==================================\n");
pr_warn("WARNING: Nested lock was not taken\n");
print_kernel_ident();
@@ -5060,6 +5081,7 @@ print_lock_nested_lock_not_held(struct task_struct *curr,
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -5281,6 +5303,7 @@ static void print_unlock_imbalance_bug(struct task_struct *curr,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("=====================================\n");
pr_warn("WARNING: bad unlock balance detected!\n");
print_kernel_ident();
@@ -5296,6 +5319,7 @@ static void print_unlock_imbalance_bug(struct task_struct *curr,
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -6013,6 +6037,7 @@ static void print_lock_contention_bug(struct task_struct *curr,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("=================================\n");
pr_warn("WARNING: bad contention detected!\n");
print_kernel_ident();
@@ -6028,6 +6053,7 @@ static void print_lock_contention_bug(struct task_struct *curr,
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -6680,6 +6706,7 @@ print_freed_lock_bug(struct task_struct *curr, const void *mem_from,
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("=========================\n");
pr_warn("WARNING: held lock freed!\n");
print_kernel_ident();
@@ -6691,6 +6718,7 @@ print_freed_lock_bug(struct task_struct *curr, const void *mem_from,
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -6742,6 +6770,7 @@ static void print_held_locks_bug(void)
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("====================================\n");
pr_warn("WARNING: %s/%d still has locks held!\n",
current->comm, task_pid_nr(current));
@@ -6750,6 +6779,7 @@ static void print_held_locks_bug(void)
lockdep_print_held_locks(current);
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -6811,6 +6841,7 @@ asmlinkage __visible void lockdep_sys_exit(void)
return;
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("================================================\n");
pr_warn("WARNING: lock held when returning to user space!\n");
print_kernel_ident();
@@ -6818,6 +6849,7 @@ asmlinkage __visible void lockdep_sys_exit(void)
pr_warn("%s/%d is leaving the kernel with locks still held!\n",
curr->comm, curr->pid);
lockdep_print_held_locks(curr);
+ print_footer();
nbcon_cpu_emergency_exit();
}
@@ -6837,6 +6869,7 @@ void lockdep_rcu_suspicious(const char *file, const int line, const char *s)
/* Note: the following can be executed concurrently, so be careful. */
nbcon_cpu_emergency_enter();
pr_warn("\n");
+ pr_warn(CUT_HERE);
pr_warn("=============================\n");
pr_warn("WARNING: suspicious RCU usage\n");
print_kernel_ident();
@@ -6874,6 +6907,7 @@ void lockdep_rcu_suspicious(const char *file, const int line, const char *s)
lockdep_print_held_locks(curr);
pr_warn("\nstack backtrace:\n");
dump_stack();
+ print_footer();
nbcon_cpu_emergency_exit();
warn_rcu_exit(rcu);
}
--
2.52.0.rc1.455.g30608eb744-goog
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