Re: assertion failure in ber_free_buf() of io.c (ITS#2655)

[maxchern@yahoo.com]

Try disable referrals in slapd.conf (comment them out)
and see whether you run into this problem again.
The problem is that you got an invalid ber, referral
freeing is one of the place that invalid ber will
occur.

--- abe@purdue.edu wrote:
> Full_Name: Victor A. Abell
> Version: 2.1.21
> OS: Solaris 8
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (128.210.177.112)
> 
> 
> OpenLDAP 2.1.21 has crashed once in the four days
> since it was put into
> production.  The crash occurred at an assert() at
> line 161 of the
> ber_free_buf() function of the
> libraries/liblber/io.c translation unit.
> 
> The core file stack trace says:
> 
> Current function is ber_free_buf
>   161           assert( LBER_VALID( ber ) );
> (dbx 1) where
> current thread: t@13
>   [1] __sigprocmask(0x0, 0xfa001540, 0x0, 0x0, 0x0,
> 0x0), at 0xfef29ab8
>   [2] _resetsig(0xfef2c340, 0x0, 0x0, 0xfa001d78,
> 0xfef3e000, 0x0), at
> 0xfef1e50
> c
>   [3] _sigon(0xfa001d78, 0xfef45980, 0x6,
> 0xfa001614, 0xfa001d78, 0xfef9155d),
> a
> t 0xfef1dcac
>   [4] _thrp_kill(0x0, 0xd, 0x6, 0xfef3e000, 0xd,
> 0xff03c4a0), at 0xfef20cc0
>   [5] raise(0x6, 0x0, 0x0, 0xffffffff, 0x1e6550,
> 0x0), at 0xfefcb190
>   [6] abort(0xff03801c, 0xfa001768, 0x39,
> 0x7efefeff, 0x81010100, 0xff00), at
> 0x
> fefb57bc
>   [7] _assert(0x1af5c8, 0x1af5dc, 0xa1, 0x1af5dc,
> 0x0, 0x1d3e48), at 0xfefb5a60
> =>[8] ber_free_buf(ber = 0x2a23d0), line 161 in
> "io.c"
>   [9] ber_free(ber = 0x2a23d0, freebuf = 1), line
> 187 in "io.c"
>   [10] slap_op_free(op = 0x2a30b8), line 48 in
> "operation.c"
>   [11] connection_operation(ctx = 0x2ac520, arg_v =
> 0x2a30b8), line 1060 in
> "con
> nection.c"
>   [12] ldap_int_thread_pool_wrapper(xpool =
> 0x1eb408), line 426 in "tpool.c"
> 
> The ber pointer used by ber_free_buf() derefences
> to:
> 
> *ber = {
>     ber_opts    = {
>         lbo_valid    = 49
>         lbo_options  = 5136U
>         lbo_debug    = 0;
>         lbo_meminuse = 2497312
>     }
>     ber_tag     = 119U
>     ber_len     = 2848856U
>     ber_usertag = 0
>     ber_buf     = 0x2f8300 ""
>     ber_ptr     = 0x2fd4bc ""
>     ber_end     = 0x2fd4bc ""
>     ber_sos     = (nil)
>     ber_rwptr   = 0x2a23c8 ""
> }
> 
> The ber_valid (ber->ber_opts.lbo_valid) value, 49,
> is clearly invalid.
> 
> I have discovered a similar issuereport, but in a
> different io.c function,
> in Incoming/2633.  It, too, applies to OpenDLAP
> 2.1.21 on Solaris 8.
> 
> Any suggestions on further core analysis, available
> patches, etc., would
> be most welcome.
> 
> Vic Abell


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