linux-kernel - sparse breakage triggered by rcu_read

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 16 Oct 2007 14:55:21 +0400
From:	Alexey Dobriyan <adobriyan@...ru>
To:	linux-sparse@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: sparse breakage triggered by rcu_read_lock() lockdep annotations

FWIW, commit 851a67b825540a8e00c0be3ee25e4627ba8b133b
aka "lockdep: annotate rcu_read_{,un}lock{,_bh}"
causes sparse to trigger internal assertion in quite a few places over
allyesconfig run.

	sparse: flow.c:805: rewrite_parent_branch: Assertion `changed' failed.

Trimmed down testcase:

	void f(unsigned long ip);
	static void g(void)
	{
	        if (1) {
	              f(({ __label__ x; x: (unsigned long)&&x; }));
	        }
	        f(({ __label__ x; x: (unsigned long)&&x; }));
	}

#0  0x4001c410 in __kernel_vsyscall ()
(gdb) bt
#0  0x4001c410 in __kernel_vsyscall ()
#1  0x40050701 in raise () from /lib/libc.so.6
#2  0x40051e38 in abort () from /lib/libc.so.6
#3  0x40049fcc in __assert_fail () from /lib/libc.so.6
#4  0x08064947 in pack_basic_blocks (ep=0x411a1c6c) at flow.c:812
#5  0x0805ffbf in linearize_symbol (sym=0x4103ec8c) at linearize.c:2154
#6  0x080492a3 in main (argc=Cannot access memory at address 0x274d) at sparse.c:266

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/