Bugs item #2538837, was opened at 2009-01-27 00:11
Message generated for change (Comment added) made by mlkersten
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Category: Core
Group: MonetDB5 CVS Head
Status: Closed
Resolution: Fixed
Priority: 5
Private: No
Submitted By: Stefan Manegold (stmane)
Assigned to: Martin Kersten (mlkersten)
Summary: mserver5 segfault (double free) when quitting debugger
Initial Comment:
With a freshly stated ("virgin") M5/SQL server (`mserver5 --dbinit='include
sql;'), the following simple `mclient -lsql` session results in an assertion or
segfault in GDKfree, most probably due to an attemt to free already freed or
not allocated memory:
$ mclient -lsql
sql>debug select * from tables;
mdb># mdb.start();
mdb>n
mdb># user.s0_1();
mdb>[Crtl-D]
gdb reveals the following:
$ gdb --args mserver5 --dbinit='include sql;'
[...]
(gdb) r
[...]
# MonetDB server v5.9.0, based on kernel v1.27.0
# Serving database 'demo', using 4 threads
# Compiled for x86_64-unknown-linux-gnu/64bit with 64bit OIDs dynamically linked
# Copyright (c) 1993-July 2008 CWI.
# Copyright (c) August 2008- MonetDB B.V., all rights reserved
# Visit http://monetdb.cwi.nl/ for further information
#warning: please don't forget to set your vault key!
#(see .../etc/monetdb5.conf)
# Listening for connection requests on mapi:monetdb://127.0.0.1:50000/
# MonetDB/SQL module v2.27.0 loaded
>
mserver5: .../MonetDB/src/gdk/gdk_utils.mx:1110: GDKfree: Assertion `size != 0'
failed.
Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffe1ca7950 (LWP 25596)]
0x0000003675232f05 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install
bzip2-libs-1.0.5-3.fc10.x86_64 e2fsprogs-libs-1.41.3-2.fc10.x86_64
glibc-2.9-3.x86_64 keyutils-libs-1.2-3.fc9.x86_64
krb5-libs-1.6.3-16.fc10.x86_64 libselinux-2.0.73-1.fc10.x86_64
ncurses-libs-5.6-20.20080927.fc10.x86_64 openssl-0.9.8g-12.fc10.x86_64
pcre-7.8-1.fc10.x86_64 readline-5.2-13.fc9.x86_64 zlib-1.2.3-18.fc9.x86_64
(gdb) bt
#0 0x0000003675232f05 in raise () from /lib64/libc.so.6
#1 0x0000003675234a73 in abort () from /lib64/libc.so.6
#2 0x000000367522bef9 in __assert_fail () from /lib64/libc.so.6
#3 0x00007ffff7400b54 in GDKfree (blk=0x12ff8f8) at
.../MonetDB/src/gdk/gdk_utils.mx:1110
#4 0x00007ffff7d34281 in runScenarioBody (c=0x6049f8) at
.../MonetDB5/src/mal/mal_scenario.mx:613
#5 0x00007ffff7d34557 in runScenario (c=0x6049f8) at
.../MonetDB5/src/mal/mal_scenario.mx:660
#6 0x00007ffff7cf844b in MSserveClient (dummy=0x6049f8) at
.../MonetDB5/src/mal/mal_session.mx:461
#7 0x0000003675e073da in start_thread () from /lib64/libpthread.so.0
#8 0x00000036752e62bd in clone () from /lib64/libc.so.6
(gdb) up
#1 0x0000003675234a73 in abort () from /lib64/libc.so.6
(gdb)
#2 0x000000367522bef9 in __assert_fail () from /lib64/libc.so.6
(gdb)
#3 0x00007ffff7400b54 in GDKfree (blk=0x12ff8f8) at
.../MonetDB/src/gdk/gdk_utils.mx:1110
1110 assert(size != 0);
(gdb) li
1105 size = GDK_MEM_BLKSIZE(s);
1106
1107 /* check against duplicate free */
1108 assert((size & 2) == 0);
1109
1110 assert(size != 0);
1111
1112 if (size < 0) {
1113 size_t maxsize = (size_t) s[-2];
1114
(gdb) printf "%x\n",*s
dbdbdbdb
(gdb)
----------------------------------------------------------------------
>Comment By: Martin Kersten (mlkersten)
Date: 2009-01-27 09:24
Message:
fixed by resetting the variable after GDKfree
----------------------------------------------------------------------
Comment By: Martin Kersten (mlkersten)
Date: 2009-01-27 01:15
Message:
fixed by resetting the variable after GDKfree
----------------------------------------------------------------------
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