[tip:core/locking] lockdep, rtmutex, bug: Show taint flags on error

From: tip-bot for Ben Hutchings
Date: Tue Dec 06 2011 - 04:39:20 EST

Commit-ID: fbdc4b9a6c29befbcca65e5366e5aaf2abb7a013
Gitweb: http://git.kernel.org/tip/fbdc4b9a6c29befbcca65e5366e5aaf2abb7a013
Author: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
AuthorDate: Fri, 28 Oct 2011 04:36:55 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 6 Dec 2011 08:16:49 +0100

lockdep, rtmutex, bug: Show taint flags on error

Show the taint flags in all lockdep and rtmutex-debug error messages.

Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1319773015.6759.30.camel@deadeye
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/lockdep.c | 23 +++++++++++++++--------
kernel/rtmutex-debug.c | 1 +
2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 103bed8..a2ab30c 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -567,11 +567,12 @@ static void lockdep_print_held_locks(struct task_struct *curr)
}
}

-static void print_kernel_version(void)
+static void print_kernel_ident(void)
{
- printk("%s %.*s\n", init_utsname()->release,
+ printk("%s %.*s %s\n", init_utsname()->release,
(int)strcspn(init_utsname()->version, " "),
- init_utsname()->version);
+ init_utsname()->version,
+ print_tainted());
}

static int very_verbose(struct lock_class *class)
@@ -1149,7 +1150,7 @@ print_circular_bug_header(struct lock_list *entry, unsigned int depth,
printk("\n");
printk("======================================================\n");
printk("[ INFO: possible circular locking dependency detected ]\n");
- print_kernel_version();
+ print_kernel_ident();
printk("-------------------------------------------------------\n");
printk("%s/%d is trying to acquire lock:\n",
curr->comm, task_pid_nr(curr));
@@ -1488,7 +1489,7 @@ print_bad_irq_dependency(struct task_struct *curr,
printk("======================================================\n");
printk("[ INFO: %s-safe -> %s-unsafe lock order detected ]\n",
irqclass, irqclass);
- print_kernel_version();
+ print_kernel_ident();
printk("------------------------------------------------------\n");
printk("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] is trying to acquire:\n",
curr->comm, task_pid_nr(curr),
@@ -1717,7 +1718,7 @@ print_deadlock_bug(struct task_struct *curr, struct held_lock *prev,
printk("\n");
printk("=============================================\n");
printk("[ INFO: possible recursive locking detected ]\n");
- print_kernel_version();
+ print_kernel_ident();
printk("---------------------------------------------\n");
printk("%s/%d is trying to acquire lock:\n",
curr->comm, task_pid_nr(curr));
@@ -2224,7 +2225,7 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this,
printk("\n");
printk("=================================\n");
printk("[ INFO: inconsistent lock state ]\n");
- print_kernel_version();
+ print_kernel_ident();
printk("---------------------------------\n");

printk("inconsistent {%s} -> {%s} usage.\n",
@@ -2289,7 +2290,7 @@ print_irq_inversion_bug(struct task_struct *curr,
printk("\n");
printk("=========================================================\n");
printk("[ INFO: possible irq lock inversion dependency detected ]\n");
- print_kernel_version();
+ print_kernel_ident();
printk("---------------------------------------------------------\n");
printk("%s/%d just changed the state of lock:\n",
curr->comm, task_pid_nr(curr));
@@ -3170,6 +3171,7 @@ print_unlock_inbalance_bug(struct task_struct *curr, struct lockdep_map *lock,
printk("\n");
printk("=====================================\n");
printk("[ BUG: bad unlock balance detected! ]\n");
+ print_kernel_ident();
printk("-------------------------------------\n");
printk("%s/%d is trying to release lock (",
curr->comm, task_pid_nr(curr));
@@ -3614,6 +3616,7 @@ print_lock_contention_bug(struct task_struct *curr, struct lockdep_map *lock,
printk("\n");
printk("=================================\n");
printk("[ BUG: bad contention detected! ]\n");
+ print_kernel_ident();
printk("---------------------------------\n");
printk("%s/%d is trying to contend lock (",
curr->comm, task_pid_nr(curr));
@@ -3988,6 +3991,7 @@ print_freed_lock_bug(struct task_struct *curr, const void *mem_from,
printk("\n");
printk("=========================\n");
printk("[ BUG: held lock freed! ]\n");
+ print_kernel_ident();
printk("-------------------------\n");
printk("%s/%d is freeing memory %p-%p, with a lock still held there!\n",
curr->comm, task_pid_nr(curr), mem_from, mem_to-1);
@@ -4045,6 +4049,7 @@ static void print_held_locks_bug(struct task_struct *curr)
printk("\n");
printk("=====================================\n");
printk("[ BUG: lock held at task exit time! ]\n");
+ print_kernel_ident();
printk("-------------------------------------\n");
printk("%s/%d is exiting with locks still held!\n",
curr->comm, task_pid_nr(curr));
@@ -4142,6 +4147,7 @@ void lockdep_sys_exit(void)
printk("\n");
printk("================================================\n");
printk("[ BUG: lock held when returning to user space! ]\n");
+ print_kernel_ident();
printk("------------------------------------------------\n");
printk("%s/%d is leaving the kernel with locks still held!\n",
curr->comm, curr->pid);
@@ -4161,6 +4167,7 @@ void lockdep_rcu_suspicious(const char *file, const int line, const char *s)
printk("\n");
printk("===============================\n");
printk("[ INFO: suspicious RCU usage. ]\n");
+ print_kernel_ident();
printk("-------------------------------\n");
printk("%s:%d %s!\n", file, line, s);
printk("\nother info that might help us debug this:\n\n");
diff --git a/kernel/rtmutex-debug.c b/kernel/rtmutex-debug.c
index 8eafd1b..16502d3 100644
--- a/kernel/rtmutex-debug.c
+++ b/kernel/rtmutex-debug.c
@@ -101,6 +101,7 @@ void debug_rt_mutex_print_deadlock(struct rt_mutex_waiter *waiter)

printk("\n============================================\n");
printk( "[ BUG: circular locking deadlock detected! ]\n");
+ printk("%s\n", print_tainted());
printk( "--------------------------------------------\n");
printk("%s/%d is deadlocking current task %s/%d\n\n",
task->comm, task_pid_nr(task),
--
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