#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } BUG()宏定义,本质是调用ud2汇编指令 点击(此处)折叠或打开 #define BUG() \ do { \ asm volatile("1:\tud2\n" \ ".pushsection __bug_table,\"a\"\n" \ __BUG_C0 \ "\t.word %c1, 0\n" \ "\t.org 2b+%c2\n...
BUG_ON 是一个调试用宏,它类似于断言,在确定程序出异常后,将相关信息暴露出来。 简单瞥一眼: BUG_ON BUG_ON 需要传入一个 condition 参数,当 condition 为真,则表示出了预料之外的问题了。 很容易看出,BUG_ON() 是对 BUG() 的重封装,BUG() 最终是调用 panic() 来打印相关异常信息。 而panic() 则会:...
__BUG_ENTRY相当于define了一个struct bug_entry,所以是在这个struct后面紧跟了一个brk BUG_BRK_IMM指令,所以上述(unsigned long)bug + bug->bug_addr_disp即表示这条brk指令的地址,这个地址和发生brk异常时的PC值比较,如果相等,则找到了对应的bug_entry struct,并将调用BUG_ON()所在文件以及行数打印出来 看一...
#ifdef CONFIG_DEBUG_BUGVERBOSE #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS file=bug->file; #else file=(constchar*)bug+bug->file_disp; #endif line=bug->line; #endif warning=(bug->flags&BUGFLAG_WARNING)!=0; } if(warning){ /*thisisa WARN_ON rather than BUG/BUG_ON*/ printk(KERN_WAR...
原生的kernel,BUG()是直接调用panic()的: 不过Mediatek修改了BUG()的实现,这样有更多的调试信息输出(die()有寄存器等信息输出) MTK 修改 当你看到如下log时,就应该知道是BUG()/BUG_ON()引起的了! [ 147.234926]<0>-(0)[122:kworker/u8:3]Unable to handle kernel paging request at virtual address 0000...
现在我们已经通过这种方法获取到触发 bug 的语句中BUG_ON(total_sg > vq->vring.num);的 vq->vring.num 值了,而 total_sg 实际上是 virtqueue_add 的第三个参数,保存在 RDX 寄存器里,是 0x81,即十进制的 129。 合 至此,我只是分析了这几个数据结构中相关的变量内容,还没有解释这些变量或者函数的含义,...
logical block 1 Buffer I/O error on device dm-16, logical block 2 [Hardware Error]: Machine check events logged [Hardware Error]: Machine check events logged [Hardware Error]: Machine check events logged ---[ cut here ]--- kernel BUG at mm/huge_memory.c:1382! invalid opcode: 0000 [...
\n"); + BUG_ON(!PageLocked(page)); BUG_ON(from > PAGE_SIZE); BUG_ON(to > PAGE_SIZE); @@ -1185,6 +1188,7 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping, put_page(page); return PTR_ERR(handle); } + pr_err(">>> get handle: %lu in ...
Describe the bug I have recently starterd using rtorrent on RPi4. After some hours of running, like 4 or five the kernel BUG appears and makes rtorrent z zombie process. Sending SIGQUIT actually ends the process. Dmesg shows only this: [...
kerneloncredmi7touchscreen bug Replies: 0 Forum:Xiaomi Redmi Note 7 Questions & Answers ThreadKernel Development Requests Hey there, I'm a Kernel developer specialized with hypervisors and I'm planning to get some experience with Android Kernel development. Currently, I have some ideas for simple...