[Samba] Crash in 4.12.10 in

[Rowland penny]

On 10/11/2020 21:42, Peter Eriksson via samba wrote:
> I just got an INTERNAL ERROR: Signal 11 in smbd (4.12.10) in something that sids_to_unixids() in source3/winbindd/idmap_hash/idmap_has.c calls and 3 levels down - unfortunately the stack trace doesn’t say what it is - probably optimised into inline code or something.
>
> Recently upgraded from Samba 4.12.5 to 4.12.10 (self-compiled). FreeBSD 12.2
>
> It happened right after 10 hours since that smbd processes started so the 10 hours Kerberos ticket lifetime is probably involved somehow…
>
> Nov 10 21:39:11 runur01 smbd_audit[23768]:    #3 sig_fault + 0x6c [ip=0x80129a7a9] [sp=0x7fffffffcbb0]
> Nov 10 21:39:11 runur01 smbd_audit[23768]:    #4 <unknown symbol> [ip=0x801517b70] [sp=0x7fffffffcbc0]
> Nov 10 21:39:12 runur01 smbd_audit[23768]:    #5 <unknown symbol> [ip=0x80151713f] [sp=0x7fffffffcf80]
> Nov 10 21:39:12 runur01 smbd_audit[23768]:    #6 <unknown symbol> [ip=0x7ffffffff003] [sp=0x7fffffffcff0]
> Nov 10 21:39:12 runur01 smbd_audit[23768]:    #7 sids_to_unixids + 0x25d
>
> Unfortunately no core dump :-(
>
> I created a bug in bugzilla for it (14571).
>
> The calls that sids_to_unixids() calls are:
>
> idmap_hash_initialize
> wcache_tdc_fetch_list
> make_tdc_key
> tdb_fetch
> unpack_tdc_domains
> talloc_zero_array
> domain_has_idmap_config
> hash_domain_sid
> dom_sid_str_buf
> talloc
> sid_copy
> sid_copy
> sid_split_rid
> hash_domain_sid
> hash_rid
> combine_hashes
>
> But I don’t see any obvious candidate…
>
> - Peter
>
>
>
Have you read 'man idmap_hash' ?

If you did, did you miss this at the top:

idmap_hash - DO NOT USE THIS BACKEND


Please do not use idmap_hash

Rowland