Hi I'm seeing these on one of the servers running docker. 20.04 running
snmpd-5.8+dfsg-2ubuntu2.3:
kernel: snmpd[1866629]: segfault at 6f ip 00007fa535732775 sp
00007fffaf58c470 error 4 in libnetsnmpmibs.so.35.0.0[7fa535698000+d3000]
I was able to get some details, probably not enough from the crash data:
#0 __GI___libc_free (mem=0x2) at malloc.c:3102
ar_ptr = <optimized out>
p = <optimized out>
hook = 0x0
#1 0x00007f4170726f6b in netsnmp_access_interface_entry_free
(entry=0x55cbcc574880) at if-mib/data_access/interface.c:320
__func__ = "netsnmp_access_interface_entry_free"
#2 0x00007f41706fc718 in ifTable_rowreq_ctx_cleanup
(rowreq_ctx=rowreq_ctx@entry=0x55cbcc587fe0) at if-mib/ifTable/ifTable.c:228
__func__ = "ifTable_rowreq_ctx_cleanup"
#3 0x00007f417072ae22 in ifTable_release_rowreq_ctx
(rowreq_ctx=0x55cbcc587fe0) at if-mib/ifTable/ifTable_interface.c:626
__func__ = "ifTable_release_rowreq_ctx"
#4 0x00007f4170578848 in _ssll_for_each (c=<optimized out>, f=0x7f417072bbd0
<_delete_missing_interface>, context=0x55cbcc3e7c20) at
container_list_ssll.c:284
sl = <optimized out>
curr = 0x55cbcc594a50
#5 0x00007f417072cef8 in ifTable_container_load (container=0x55cbcc3e7c20) at
if-mib/ifTable/ifTable_data_access.c:643
cdc = {current = 0x55cbcc59b720, deleted = 0x55cbcc59c910}
__func__ = "ifTable_container_load"
#6 0x00007f41709074ad in _cache_load (cache=0x55cbcc3e7b90) at
helpers/cache_handler.c:735
ret = -1
#7 0x00007f41705524b7 in run_alarms () at snmp_alarm.c:218
a = 0x55cbcc3e9820
clientreg = 5
t_now = {tv_sec = 1922816, tv_usec = 13682}
__func__ = "run_alarms"
#8 0x000055cbcba3a864 in receive () at snmpd.c:1376
numfds = 8
readfds = {lfs_setsize = 1024, lfs_setptr = 0x7fff01800d50, lfs_set =
{fds_bits = {0 <repeats 16 times>}}}
writefds = {lfs_setsize = 1024, lfs_setptr = 0x7fff01800de0, lfs_set =
{fds_bits = {0 <repeats 16 times>}}}
exceptfds = {lfs_setsize = 1024, lfs_setptr = 0x7fff01800e70, lfs_set =
{fds_bits = {0 <repeats 16 times>}}}
timeout = {tv_sec = 0, tv_usec = 0}
tvp = <optimized out>
count = 0
block = 0
i = <optimized out>
sd = <optimized out>
__func__ = "receive"
#9 0x000055cbcba3a10d in main (argc=<optimized out>, argv=<optimized out>) at
snmpd.c:1125
options = "aAc:CdD::fhHI:l:L:m:M:n:p:P:qrsS:UvV-:Y:g:u:x:X"
arg = <optimized out>
i = <optimized out>
ret = <optimized out>
exit_code = 1
dont_fork = <optimized out>
do_help = <optimized out>
log_set = <optimized out>
agent_mode = -1
pid_file = 0x0
option_compatability = "-Le"
fd = <optimized out>
PID = <optimized out>
__func__ = "main"
The call trace seems similar to a one of the comments in this case
https://github.com/net-snmp/net-snmp/issues/107#issuecomment-886216752
** Bug watch added: github.com/net-snmp/net-snmp/issues #107
https://github.com/net-snmp/net-snmp/issues/107
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https://bugs.launchpad.net/bugs/720638
Title:
snmpd crashes with segfault (libnetsnmpmibs.so.15.1.2)
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