????4. ????????core?????????
??????1?? /proc/sys/kernel/core_uses_pid ????????????core??????????????????pid????????????????????????1???????0??????????pid???????core???????core.xxx??xxx?core dump?????????????0????????????pid.
??????2?? /proc/sys/kernel/core_pattern ??????????????core???????λ????????????????????????????
????|/usr/share/apport/apport %p %s %c %P
????1
????|/usr/share/apport/apport %p %s %c %P
???????????????????????????????
????echo “/corefile/core-%e-%p-%t” > core_pattern ???????????core??????????/corefile???￡?????????????core-??????-pid-??????
?????????о???3?????????
????%p - insert pid into filename ???pid
????%u - insert current uid into filename ?????uid
????%g - insert current gid into filename ?????gid
????%s - insert signal that caused the coredump into the filename ?????2???core?????
????%t - insert UNIX time that the coredump occurred into filename ???core??????????unix???
????%h - insert hostname where the coredump happened into filename ?????????
????%e - insert coredumping executable name into filename ?????????
????5. ??β?core???
??????????????gdb????core?????core??????????????????????????????core?????С???С??????core???????????gdb???????????????????￡?
????gdb [exec file] [core file]
???????磺  gdb ./test core.3937 ??gdb?????????????bt??where??????????????????????
????6. ?Щ???????
??????Linux??????????????????Coredump??????Щ????
???????????Coredump???????????????? ???д???????Coredump?????????????????????????????????????y?????????????????????????????????????????????? ????????????????????????????н?????????????????????”/proc/<????pid>/cwd“????????????????????? ?????????????????????????????????????????????????
??????????????seteuid()/setegid()??? ????????Ч??????飬?????????????????????Щ????????Coredump????????????????seteuid()????MySQL?????????????? ??????mysqld_safe???MySQL??mysqld???е???Ч????????msyql???????????????????A?????????????????ps?????? ??????????????B??????????Щ???????????seteuid?????????????Щ????????core dump???????/proc/sys/fs /suid_dumpable???????????1??????????0????
???????????????????????????Core?????С???? ???????????????Core?????С????????????????????С?????????????????????????????????????????綹?????????????????????? ??????????????????????????????????????????????????????С?????????????3????????????ú????檔?????????????????????? ??????????????????Core??????????С???????unlimited??á?