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Message-ID: <5720AEDC.3080409@acm.org> Date: Wed, 27 Apr 2016 07:21:48 -0500 From: Corey Minyard <minyard@....org> To: kexec@...ts.infradead.org, linux-kernel@...r.kernel.org, Vivek Goyal <vgoyal@...hat.com>, Haren Myneni <hbabu@...ibm.com> Cc: Corey Minyard <cminyard@...sta.com> Subject: Re: [PATCH] kdump: Fix gdb macros work work with newer and 64-bit kernels Any comments on this? If no one else cares I'd be willing to take over maintenance of this. -corey On 02/25/2016 07:51 AM, minyard@....org wrote: > From: Corey Minyard <cminyard@...sta.com> > > Lots of little changes needed to be made to clean these up, remove the > four byte pointer assumption and traverse the pid queue properly. > Also consolidate the traceback code into a single function instead > of having three copies of it. > > Signed-off-by: Corey Minyard <cminyard@...sta.com> > --- > Documentation/kdump/gdbmacros.txt | 90 +++++++++++++++++---------------------- > 1 file changed, 40 insertions(+), 50 deletions(-) > > I sent this earlier, but I didn't get a response. These are clearly > wrong. I'd be happy to take over maintenance of these macros. It > might be better to move them someplace else, too, since they are also > useful for kgdb. > > diff --git a/Documentation/kdump/gdbmacros.txt b/Documentation/kdump/gdbmacros.txt > index 9b9b454..e5bbd8d 100644 > --- a/Documentation/kdump/gdbmacros.txt > +++ b/Documentation/kdump/gdbmacros.txt > @@ -15,14 +15,14 @@ > > define bttnobp > set $tasks_off=((size_t)&((struct task_struct *)0)->tasks) > - set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next) > + set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next) > set $init_t=&init_task > set $next_t=(((char *)($init_t->tasks).next) - $tasks_off) > while ($next_t != $init_t) > set $next_t=(struct task_struct *)$next_t > printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm > printf "===================\n" > - set var $stackp = $next_t.thread.esp > + set var $stackp = $next_t.thread.sp > set var $stack_top = ($stackp & ~4095) + 4096 > > while ($stackp < $stack_top) > @@ -31,12 +31,12 @@ define bttnobp > end > set $stackp += 4 > end > - set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off) > + set $next_th=(((char *)$next_t->thread_group.next) - $pid_off) > while ($next_th != $next_t) > set $next_th=(struct task_struct *)$next_th > printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm > printf "===================\n" > - set var $stackp = $next_t.thread.esp > + set var $stackp = $next_t.thread.sp > set var $stack_top = ($stackp & ~4095) + 4096 > > while ($stackp < $stack_top) > @@ -45,7 +45,7 @@ define bttnobp > end > set $stackp += 4 > end > - set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off) > + set $next_th=(((char *)$next_th->thread_group.next) - $pid_off) > end > set $next_t=(char *)($next_t->tasks.next) - $tasks_off > end > @@ -54,42 +54,43 @@ document bttnobp > dump all thread stack traces on a kernel compiled with !CONFIG_FRAME_POINTER > end > > +define btthreadstruct > + set var $pid_task = $arg0 > + > + printf "\npid %d; comm %s:\n", $pid_task.pid, $pid_task.comm > + printf "task struct: " > + print $pid_task > + printf "===================\n" > + set var $stackp = $pid_task.thread.sp > + set var $stack_top = ($stackp & ~4095) + 4096 > + set var $stack_bot = ($stackp & ~4095) > + > + set $stackp = *((unsigned long *) $stackp) > + while (($stackp < $stack_top) && ($stackp > $stack_bot)) > + set var $addr = *(((unsigned long *) $stackp) + 1) > + info symbol $addr > + set $stackp = *((unsigned long *) $stackp) > + end > +end > +document btthreadstruct > + dump a thread stack using the given task structure pointer > +end > + > + > define btt > set $tasks_off=((size_t)&((struct task_struct *)0)->tasks) > - set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next) > + set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next) > set $init_t=&init_task > set $next_t=(((char *)($init_t->tasks).next) - $tasks_off) > while ($next_t != $init_t) > set $next_t=(struct task_struct *)$next_t > - printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm > - printf "===================\n" > - set var $stackp = $next_t.thread.esp > - set var $stack_top = ($stackp & ~4095) + 4096 > - set var $stack_bot = ($stackp & ~4095) > + btthreadstruct $next_t > > - set $stackp = *($stackp) > - while (($stackp < $stack_top) && ($stackp > $stack_bot)) > - set var $addr = *($stackp + 4) > - info symbol $addr > - set $stackp = *($stackp) > - end > - > - set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off) > + set $next_th=(((char *)$next_t->thread_group.next) - $pid_off) > while ($next_th != $next_t) > set $next_th=(struct task_struct *)$next_th > - printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm > - printf "===================\n" > - set var $stackp = $next_t.thread.esp > - set var $stack_top = ($stackp & ~4095) + 4096 > - set var $stack_bot = ($stackp & ~4095) > - > - set $stackp = *($stackp) > - while (($stackp < $stack_top) && ($stackp > $stack_bot)) > - set var $addr = *($stackp + 4) > - info symbol $addr > - set $stackp = *($stackp) > - end > - set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off) > + btthreadstruct $next_th > + set $next_th=(((char *)$next_th->thread_group.next) - $pid_off) > end > set $next_t=(char *)($next_t->tasks.next) - $tasks_off > end > @@ -101,7 +102,7 @@ end > define btpid > set var $pid = $arg0 > set $tasks_off=((size_t)&((struct task_struct *)0)->tasks) > - set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next) > + set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next) > set $init_t=&init_task > set $next_t=(((char *)($init_t->tasks).next) - $tasks_off) > set var $pid_task = 0 > @@ -113,29 +114,18 @@ define btpid > set $pid_task = $next_t > end > > - set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off) > + set $next_th=(((char *)$next_t->thread_group.next) - $pid_off) > while ($next_th != $next_t) > set $next_th=(struct task_struct *)$next_th > if ($next_th.pid == $pid) > set $pid_task = $next_th > end > - set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off) > + set $next_th=(((char *)$next_th->thread_group.next) - $pid_off) > end > set $next_t=(char *)($next_t->tasks.next) - $tasks_off > end > > - printf "\npid %d; comm %s:\n", $pid_task.pid, $pid_task.comm > - printf "===================\n" > - set var $stackp = $pid_task.thread.esp > - set var $stack_top = ($stackp & ~4095) + 4096 > - set var $stack_bot = ($stackp & ~4095) > - > - set $stackp = *($stackp) > - while (($stackp < $stack_top) && ($stackp > $stack_bot)) > - set var $addr = *($stackp + 4) > - info symbol $addr > - set $stackp = *($stackp) > - end > + btthreadstruct $pid_task > end > document btpid > backtrace of pid > @@ -145,7 +135,7 @@ end > define trapinfo > set var $pid = $arg0 > set $tasks_off=((size_t)&((struct task_struct *)0)->tasks) > - set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next) > + set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next) > set $init_t=&init_task > set $next_t=(((char *)($init_t->tasks).next) - $tasks_off) > set var $pid_task = 0 > @@ -157,13 +147,13 @@ define trapinfo > set $pid_task = $next_t > end > > - set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off) > + set $next_th=(((char *)$next_t->thread_group.next) - $pid_off) > while ($next_th != $next_t) > set $next_th=(struct task_struct *)$next_th > if ($next_th.pid == $pid) > set $pid_task = $next_th > end > - set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off) > + set $next_th=(((char *)$next_th->thread_group.next) - $pid_off) > end > set $next_t=(char *)($next_t->tasks.next) - $tasks_off > end
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