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| author |   Oleg Nesterov <oleg@redhat.com> | 2013-08-01 18:59:41 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2013-08-02 11:02:42 +0200 |
| commit | 41e85ce8220c6e5fdef706fda6696cd291115b63 (patch) | |
| tree | 73ed47c499f36d3f846abbb1868e0e1fe4b7b2bc /kernel/hung_task.c | |
| parent | mutex: Avoid label warning when !CONFIG_MUTEX_SPIN_ON_OWNER (diff) | |
| download | linux-dev-41e85ce8220c6e5fdef706fda6696cd291115b63.tar.xz linux-dev-41e85ce8220c6e5fdef706fda6696cd291115b63.zip | |
hung_task debugging: Print more info when reporting the problem
printk(KERN_ERR) from check_hung_task() likely means we have a bug,
but unlike BUG_ON()/WARN_ON ()it doesn't show the kernel version,
this complicates the bug-reports investigation.
Add the additional pr_err() to print tainted/release/version
like dump_stack_print_info() does, the output becomes:
INFO: task perl:504 blocked for more than 2 seconds.
Not tainted 3.11.0-rc1-10367-g136bb46-dirty #1763
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
...
While at it, turn the old printk's into pr_err().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: ahecox@redhat.com
Cc: Christopher Williams <cww@redhat.com>
Cc: dwysocha@redhat.com
Cc: gavin@redhat.com
Cc: Mandeep Singh Baines <msb@chromium.org>
Cc: nshi@redhat.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20130801165941.GA17544@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/hung_task.c')
| -rw-r--r-- | kernel/hung_task.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/kernel/hung_task.c b/kernel/hung_task.c index 6df614912b9d..3e97fb126e6b 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -15,6 +15,7 @@ #include <linux/lockdep.h> #include <linux/export.h> #include <linux/sysctl.h> +#include <linux/utsname.h> /* * The number of tasks checked: @@ -99,10 +100,14 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout) * Ok, the task did not get scheduled for more than 2 minutes, * complain: */ - printk(KERN_ERR "INFO: task %s:%d blocked for more than " - "%ld seconds.\n", t->comm, t->pid, timeout); - printk(KERN_ERR "\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\"" - " disables this message.\n"); + pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n", + t->comm, t->pid, timeout); + pr_err(" %s %s %.*s\n", + print_tainted(), init_utsname()->release, + (int)strcspn(init_utsname()->version, " "), + init_utsname()->version); + pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\"" + " disables this message.\n"); sched_show_task(t); debug_show_held_locks(t); |