- **Comment**:
We are some how able to simulated one case where slimier core dump occurs.
their can some other case this core dump can occur , as soon as we fund root
cause
we will provide the patch for that as well.
In this test case , If OSAF_CKPT_SHM_ALLOC_GUARANTEE is NOT set and SHM is
100% used in system ,
cpnd Segmentation fault (core dumped) at LEAP memcpy().
Following are the detailed steps how we reproduced ,
this test is generating same core dumb as below.
Test application : cpsv_shm_2202.c
==================================================================
1) /etc/init.d/opensafd stop
2) Change the defaults /dev/shm size to 3MB
# vi /etc/fstab tmpfs
And add following line
` tmpfs /dev/shm tmpfs defaults,size=3m 0 0`
3) Remount /dev/shm
#mount -o remount /dev/shm
4) Check /dev/shm reflected with new value
# df -k /dev/shm/
Filesystem 1K-blocks Used Available Use% Mounted on
tmpfs 3072 0 3072 0% /dev/shm
5) set ulimit to unlimited
#ulimit -c unlimited
6) #/etc/init.d/opensafd start
7) Compile & run attached test application ( cpsv_shm_2202.c )
#gcc cpsv_shm_2202.c -o ckpt_shm -lSaCkpt
# ./ckpt_shm
8) Once /dev/shm/ reach 100% Use you will see core dump same as yours
# df -k /dev/shm/
7) Then we applied the patch test again with no core dump
saCkptSectionCreate 1 returned 18. ( no core dump )
==============================================================
---
** [tickets:#2207] cpnd: osafckptnd core dump while handling error
section_hdr_update_fails**
**Status:** review
**Milestone:** 5.2.FC
**Created:** Thu Nov 24, 2016 09:45 AM UTC by Vo Minh Hoang
**Last Updated:** Thu Nov 24, 2016 09:56 AM UTC
**Owner:** Vo Minh Hoang
the steps to add a section is add_db_tree -> update_sec_hdr -> update_ckpt_hdr
so if an error occur cpsv should handle error in reverse order.
currently, section_hdr_update_fails, cpsv revert ckpt_hdr also that possibly
cause the problem
Coredump:
~~~
Core was generated by `/usr/lib64/opensaf/osafckptnd'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f1846da1109 in __memcpy_sse2_unaligned () from /lib64/libc.so.6
Missing separate debuginfos, use: zypper install
opensaf-ckpt-nodedirector-debuginfo-5.1.0-99.0.686bc00.sle12.x86_64
(gdb) bt
#0 0x00007f1846da1109 in __memcpy_sse2_unaligned () from /lib64/libc.so.6
#1 0x00007f1847f26f25 in memcpy (__len=<optimized out>, __src=<optimized out>,
__dest=<optimized out>)
at /usr/include/x86_64-linux-gnu/bits/string3.h:53
#2 ncs_os_posix_shm (req=req@entry=0x7ffd24f978f0) at os_defs.c:859
#3 0x000000000041561d in cpnd_ckpt_hdr_update (cp_node=cp_node@entry=0xa708e0)
at cpnd_proc.c:1833
#4 0x000000000041b016 in cpnd_ckpt_sec_del (cp_node=cp_node@entry=0xa708e0,
id=id@entry=0x7f1840007350)
at cpnd_sec.cc:220
#5 0x0000000000406190 in cpnd_ckpt_sec_add (cp_node=cp_node@entry=0xa708e0,
id=0x7f1840007350,
exp_time=1479906629297747000, gen_flag=gen_flag@entry=0) at cpnd_db.c:473
#6 0x000000000040cfe2 in cpnd_evt_proc_ckpt_sect_create (cb=cb@entry=0x8c77f0,
evt=evt@entry=0x7f184000a560, sinfo=sinfo@entry=0x7f184000abb8) at
cpnd_evt.c:2244
#7 0x000000000040e7cc in cpnd_process_evt (evt=0x7f184000a550) at
cpnd_evt.c:227
#8 0x00000000004103bd in cpnd_main_process (cb=cb@entry=0x8c77f0) at
cpnd_init.c:579
#9 0x0000000000405383 in main (argc=<optimized out>, argv=<optimized out>) at
cpnd_main.c:79
~~~
consequence of #2202
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