On 05/16/16 at 05:32pm, Baoquan He wrote: > On 05/10/16 at 07:30pm, minyard at acm.org wrote: > > From: Corey Minyard <cminyard at mvista.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 at mvista.com> > > Hi Corey, > > Today I tried gdbmacro.txt and found dmesg doesn't work. I tested it > on the latest 4.6.0 kernel. And I directly copy /proc/vmcore out > and use gdb to open it by below command" > > gdb vmlinux /var/crash/vmcore --"gdbmacros.txt" Here I means --command="gdbmacros.txt" > > All macro functions work well except of dmesg since code inside refer to > the deprecated variable like "log_end" and "logged_chars". But these > have been changed since this commit: > > commit 7ff9554bb578ba02166071d2d487b7fc7d860d62 > Author: Kay Sievers <kay at vrfy.org> > Date: Thu May 3 02:29:13 2012 +0200 > > printk: convert byte-buffer to variable-length record buffer > > So invoking dmesg will cause an error message printing out: > > (gdb) dmesg > No symbol "log_end" in current context. > > Thanks > Baoquan > > > --- > > > > Changes since v1: > > > > Rename btthreadstruct to btthreadstack > > > > Use sizeof(union thread_union) for the stack size instead of a hardcoded > > 4096. > > > > Documentation/kdump/gdbmacros.txt | 96 ++++++++++++++++++--------------------- > > 1 file changed, 44 insertions(+), 52 deletions(-) > > > > diff --git a/Documentation/kdump/gdbmacros.txt b/Documentation/kdump/gdbmacros.txt > > index 9b9b454..35f6a98 100644 > > --- a/Documentation/kdump/gdbmacros.txt > > +++ b/Documentation/kdump/gdbmacros.txt > > @@ -15,15 +15,16 @@ > > > > 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) > > + set var $stacksize = sizeof(union thread_union) > > while ($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 $stackp = $next_t.thread.sp > > + set var $stack_top = ($stackp & ~($stacksize - 1)) + $stacksize > > > > while ($stackp < $stack_top) > > if (*($stackp) > _stext && *($stackp) < _sinittext) > > @@ -31,13 +32,13 @@ 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 $stack_top = ($stackp & ~4095) + 4096 > > + set var $stackp = $next_t.thread.sp > > + set var $stack_top = ($stackp & ~($stacksize - 1)) + stacksize > > > > while ($stackp < $stack_top) > > if (*($stackp) > _stext && *($stackp) < _sinittext) > > @@ -45,7 +46,7 @@ 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 +55,44 @@ document bttnobp > > dump all thread stack traces on a kernel compiled with !CONFIG_FRAME_POINTER > > end > > > > +define btthreadstack > > + 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 $stacksize = sizeof(union thread_union) > > + set var $stack_top = ($stackp & ~($stacksize - 1)) + $stacksize > > + set var $stack_bot = ($stackp & ~($stacksize - 1)) > > + > > + 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 btthreadstack > > + 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) > > - > > - set $stackp = *($stackp) > > - while (($stackp < $stack_top) && ($stackp > $stack_bot)) > > - set var $addr = *($stackp + 4) > > - info symbol $addr > > - set $stackp = *($stackp) > > - end > > + btthreadstack $next_t > > > > - 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) > > + btthreadstack $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 +104,7 @@ 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 +116,18 @@ 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 > > + btthreadstack $pid_task > > end > > document btpid > > backtrace of pid > > @@ -145,7 +137,7 @@ 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 +149,13 @@ 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 > > -- > > 2.7.4 > > > > > > _______________________________________________ > > kexec mailing list > > kexec at lists.infradead.org > > http://lists.infradead.org/mailman/listinfo/kexec > > _______________________________________________ > kexec mailing list > kexec at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec
