6、dis 反编译
crash> dis -l ffffffff92994f92
/usr/src/debug/kernel-3.10.0-1160.15.2.el7/linux-3.10.0-1160.15.2.el7.x86_64/arch/x86/kernel/entry_64.S: 511
0xffffffff92994f92 <system_call_fastpath+37>: mov %rax,0x50(%rsp)
7、查看源码
从上面的反汇编结果中，我们看到问题出在entry_64.S: 第511行代码，翻开源码的相应位置，如下；
492 system_call_fastpath:
493 #if __SYSCALL_MASK == ~0
494
cmpq $__NR_syscall_max+1,%rax
495 #else
496
andl $__SYSCALL_MASK,%eax
497
cmpl $__NR_syscall_max+1,%eax
498 #endif
499
jae badsys
500
ARRAY_INDEX_NOSPEC_SYSCALL clobber_reg=%rcx
501
movq %r10,%rcx
502
503 #ifdef CONFIG_RETPOLINE
504
movq sys_call_table(, %rax, 8), %rax
505
call __x86_indirect_thunk_rax
506 #else
507
call *sys_call_table(, %rax, 8) # XXX: rip relative
508 #endif
509
510
UNWIND_END_OF_STACK
511
movq %rax,RAX(%rsp)
512 /*
