[bug, bisected, -chrisl] Segfault at evaluate.c:341

From: Hannes Eder <hannes@hanneseder.net>
To: Al Viro <viro@zeniv.linux.org.uk>, Christopher Li <sparse@chrisli.org>
Cc: linux-sparse@vger.kernel.org
Subject: [bug, bisected, -chrisl] Segfault at evaluate.c:341
Date: Thu, 19 Mar 2009 14:49:21 +0100	[thread overview]
Message-ID: <154e089b0903190649k7f099c93qedf6eb8e6a1c0a86@mail.gmail.com> (raw)

running sparse (from Christopher's tree) on linux-2.6/kernel/cred.c
(as of next-20090318, problem may appeared earlier, I have not tried
yet) causes a segfault at evaluate.c:341:

        if (type->type == SYM_NODE)
                type = type->ctype.base_type;
        if (type->type == SYM_TYPEOF) {        <======== SEGFAULT (type == NULL)
                type = evaluate_expression(type->initializer);
                if (type->type == SYM_NODE)
                        type = type->ctype.base_type;
        }

the complete command line:

sparse -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise
-Wno-return-void -D__x86_64__ -m64 -nostdinc -isystem
/usr/lib/gcc/x86_64-redhat-linux/4.3.2/include
-Wp,-MD,kernel/.cred.o.d -nostdinc -isystem
/usr/lib/gcc/x86_64-redhat-linux/4.3.2/include -Iinclude
-I/home/hannes/linux-2.6/arch/x86/include -include
include/linux/autoconf.h -D__KERNEL__ -Wall -Wundef
-Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common
-Werror-implicit-function-declaration -Os -m64 -mtune=generic
-mno-red-zone -mcmodel=kernel -funit-at-a-time
-maccumulate-outgoing-args -fstack-protector -fstack-protector-all
-DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -pipe
-Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx
-mno-sse2 -mno-3dnow -fno-omit-frame-pointer
-fno-optimize-sibling-calls -g -pg -Wdeclaration-after-statement
-Wno-pointer-sign -D"KBUILD_STR(s)=#s"
-D"KBUILD_BASENAME=KBUILD_STR(cred)"
-D"KBUILD_MODNAME=KBUILD_STR(cred)" -D"DEBUG_HASH=36"
-D"DEBUG_HASH2=28" kernel/cred.c

using "git bisect" i narrowed to problem down to:

[db31fd91f8231110ce8d8d48ce402f8cad068e44] Fix handling of ident-less
declarations

Does that help? Should I provide any further information?

Best,
-Hannes