324 lines
8.6 KiB
Plaintext
324 lines
8.6 KiB
Plaintext
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#
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# This file contains a few gdb macros (user defined commands) to extract
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# useful information from kernel crashdump (kdump) like stack traces of
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# all the processes or a particular process and trapinfo.
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#
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# These macros can be used by copying this file in .gdbinit (put in home
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# directory or current directory) or by invoking gdb command with
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# --command=<command-file-name> option
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#
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# Credits:
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# Alexander Nyberg <alexn@telia.com>
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# V Srivatsa <vatsa@in.ibm.com>
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# Maneesh Soni <maneesh@in.ibm.com>
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#
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define bttnobp
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set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
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set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next)
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set $init_t=&init_task
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set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
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set var $stacksize = sizeof(union thread_union)
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while ($next_t != $init_t)
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set $next_t=(struct task_struct *)$next_t
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printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
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printf "===================\n"
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set var $stackp = $next_t.thread.sp
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set var $stack_top = ($stackp & ~($stacksize - 1)) + $stacksize
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while ($stackp < $stack_top)
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if (*($stackp) > _stext && *($stackp) < _sinittext)
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info symbol *($stackp)
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end
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set $stackp += 4
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end
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set $next_th=(((char *)$next_t->thread_group.next) - $pid_off)
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while ($next_th != $next_t)
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set $next_th=(struct task_struct *)$next_th
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printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
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printf "===================\n"
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set var $stackp = $next_t.thread.sp
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set var $stack_top = ($stackp & ~($stacksize - 1)) + stacksize
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while ($stackp < $stack_top)
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if (*($stackp) > _stext && *($stackp) < _sinittext)
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info symbol *($stackp)
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end
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set $stackp += 4
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end
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set $next_th=(((char *)$next_th->thread_group.next) - $pid_off)
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end
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set $next_t=(char *)($next_t->tasks.next) - $tasks_off
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end
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end
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document bttnobp
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dump all thread stack traces on a kernel compiled with !CONFIG_FRAME_POINTER
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end
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define btthreadstack
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set var $pid_task = $arg0
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printf "\npid %d; comm %s:\n", $pid_task.pid, $pid_task.comm
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printf "task struct: "
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print $pid_task
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printf "===================\n"
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set var $stackp = $pid_task.thread.sp
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set var $stacksize = sizeof(union thread_union)
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set var $stack_top = ($stackp & ~($stacksize - 1)) + $stacksize
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set var $stack_bot = ($stackp & ~($stacksize - 1))
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set $stackp = *((unsigned long *) $stackp)
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while (($stackp < $stack_top) && ($stackp > $stack_bot))
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set var $addr = *(((unsigned long *) $stackp) + 1)
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info symbol $addr
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set $stackp = *((unsigned long *) $stackp)
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end
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end
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document btthreadstack
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dump a thread stack using the given task structure pointer
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end
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define btt
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set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
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set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next)
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set $init_t=&init_task
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set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
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while ($next_t != $init_t)
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set $next_t=(struct task_struct *)$next_t
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btthreadstack $next_t
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set $next_th=(((char *)$next_t->thread_group.next) - $pid_off)
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while ($next_th != $next_t)
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set $next_th=(struct task_struct *)$next_th
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btthreadstack $next_th
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set $next_th=(((char *)$next_th->thread_group.next) - $pid_off)
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end
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set $next_t=(char *)($next_t->tasks.next) - $tasks_off
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end
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end
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document btt
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dump all thread stack traces on a kernel compiled with CONFIG_FRAME_POINTER
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end
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define btpid
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set var $pid = $arg0
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set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
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set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next)
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set $init_t=&init_task
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set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
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set var $pid_task = 0
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while ($next_t != $init_t)
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set $next_t=(struct task_struct *)$next_t
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if ($next_t.pid == $pid)
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set $pid_task = $next_t
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end
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set $next_th=(((char *)$next_t->thread_group.next) - $pid_off)
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while ($next_th != $next_t)
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set $next_th=(struct task_struct *)$next_th
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if ($next_th.pid == $pid)
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set $pid_task = $next_th
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end
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set $next_th=(((char *)$next_th->thread_group.next) - $pid_off)
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end
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set $next_t=(char *)($next_t->tasks.next) - $tasks_off
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end
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btthreadstack $pid_task
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end
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document btpid
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backtrace of pid
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end
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define trapinfo
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set var $pid = $arg0
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set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
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set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next)
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set $init_t=&init_task
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set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
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set var $pid_task = 0
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while ($next_t != $init_t)
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set $next_t=(struct task_struct *)$next_t
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if ($next_t.pid == $pid)
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set $pid_task = $next_t
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end
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set $next_th=(((char *)$next_t->thread_group.next) - $pid_off)
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while ($next_th != $next_t)
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set $next_th=(struct task_struct *)$next_th
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if ($next_th.pid == $pid)
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set $pid_task = $next_th
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end
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set $next_th=(((char *)$next_th->thread_group.next) - $pid_off)
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end
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set $next_t=(char *)($next_t->tasks.next) - $tasks_off
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end
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printf "Trapno %ld, cr2 0x%lx, error_code %ld\n", $pid_task.thread.trap_no, \
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$pid_task.thread.cr2, $pid_task.thread.error_code
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end
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document trapinfo
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Run info threads and lookup pid of thread #1
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'trapinfo <pid>' will tell you by which trap & possibly
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address the kernel panicked.
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end
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define dump_record
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set var $desc = $arg0
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set var $info = $arg1
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if ($argc > 2)
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set var $prev_flags = $arg2
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else
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set var $prev_flags = 0
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end
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set var $prefix = 1
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set var $newline = 1
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set var $begin = $desc->text_blk_lpos.begin % (1U << prb->text_data_ring.size_bits)
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set var $next = $desc->text_blk_lpos.next % (1U << prb->text_data_ring.size_bits)
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# handle data-less record
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if ($begin & 1)
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set var $text_len = 0
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set var $log = ""
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else
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# handle wrapping data block
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if ($begin > $next)
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set var $begin = 0
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end
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# skip over descriptor id
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set var $begin = $begin + sizeof(long)
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# handle truncated message
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if ($next - $begin < $info->text_len)
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set var $text_len = $next - $begin
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else
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set var $text_len = $info->text_len
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end
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set var $log = &prb->text_data_ring.data[$begin]
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end
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# prev & LOG_CONT && !(info->flags & LOG_PREIX)
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if (($prev_flags & 8) && !($info->flags & 4))
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set var $prefix = 0
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end
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# info->flags & LOG_CONT
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if ($info->flags & 8)
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# (prev & LOG_CONT && !(prev & LOG_NEWLINE))
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if (($prev_flags & 8) && !($prev_flags & 2))
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set var $prefix = 0
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end
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# (!(info->flags & LOG_NEWLINE))
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if (!($info->flags & 2))
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set var $newline = 0
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end
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end
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if ($prefix)
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printf "[%5lu.%06lu] ", $info->ts_nsec / 1000000000, $info->ts_nsec % 1000000000
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end
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if ($text_len)
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eval "printf \"%%%d.%ds\", $log", $text_len, $text_len
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end
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if ($newline)
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printf "\n"
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end
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# handle dictionary data
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set var $dict = &$info->dev_info.subsystem[0]
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set var $dict_len = sizeof($info->dev_info.subsystem)
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if ($dict[0] != '\0')
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printf " SUBSYSTEM="
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set var $idx = 0
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while ($idx < $dict_len)
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set var $c = $dict[$idx]
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if ($c == '\0')
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loop_break
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else
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if ($c < ' ' || $c >= 127 || $c == '\\')
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printf "\\x%02x", $c
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else
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printf "%c", $c
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end
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end
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set var $idx = $idx + 1
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end
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printf "\n"
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end
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set var $dict = &$info->dev_info.device[0]
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set var $dict_len = sizeof($info->dev_info.device)
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if ($dict[0] != '\0')
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printf " DEVICE="
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set var $idx = 0
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while ($idx < $dict_len)
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set var $c = $dict[$idx]
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if ($c == '\0')
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loop_break
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else
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if ($c < ' ' || $c >= 127 || $c == '\\')
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printf "\\x%02x", $c
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else
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printf "%c", $c
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end
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end
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set var $idx = $idx + 1
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end
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printf "\n"
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end
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end
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document dump_record
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Dump a single record. The first parameter is the descriptor,
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the second parameter is the info, the third parameter is
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optional and specifies the previous record's flags, used for
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properly formatting continued lines.
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end
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define dmesg
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# definitions from kernel/printk/printk_ringbuffer.h
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set var $desc_committed = 1
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set var $desc_finalized = 2
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set var $desc_sv_bits = sizeof(long) * 8
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set var $desc_flags_shift = $desc_sv_bits - 2
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set var $desc_flags_mask = 3 << $desc_flags_shift
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set var $id_mask = ~$desc_flags_mask
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set var $desc_count = 1U << prb->desc_ring.count_bits
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set var $prev_flags = 0
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set var $id = prb->desc_ring.tail_id.counter
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set var $end_id = prb->desc_ring.head_id.counter
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while (1)
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set var $desc = &prb->desc_ring.descs[$id % $desc_count]
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set var $info = &prb->desc_ring.infos[$id % $desc_count]
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# skip non-committed record
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set var $state = 3 & ($desc->state_var.counter >> $desc_flags_shift)
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if ($state == $desc_committed || $state == $desc_finalized)
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dump_record $desc $info $prev_flags
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set var $prev_flags = $info->flags
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end
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if ($id == $end_id)
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loop_break
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end
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set var $id = ($id + 1) & $id_mask
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end
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end
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document dmesg
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print the kernel ring buffer
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end
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