From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Toralf =?iso-8859-1?q?F=F6rster?= Date: Fri, 20 May 2011 10:42:14 +0200 References: <201105191526.31904.toralf.foerster@gmx.de> <201105200937.15322.toralf.foerster@gmx.de> In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Message-Id: <201105201042.15410.toralf.foerster@gmx.de> Sender: linux-kernel-owner@vger.kernel.org Subject: Re: kernel 2.6.39 (user mode linux) crashes (2.6.38 works fine) To: richard -rw- weinberger Cc: Steven Rostedt , LKML , user-mode-linux-devel@lists.sourceforge.net List-ID: richard -rw- weinberger wrote at 09:56:02 > 2011/5/20 Toralf F=F6rster : > > ... > > Kernel panic - not syncing: Kernel mode fault at addr 0x0, ip 0x80a= 9f6b >=20 > Looks like a NULL-pointer bug. > What code is at address 80a9f6b? > Use "objdump -d -S | less" to find it. if (unlikely(ret !=3D 0)) 80a9f3a: 85 c0 test %eax,%eax 80a9f3c: 75 ca jne 80a9f08 goto out; hb =3D hash_futex(&key); 80a9f3e: 8d 45 e8 lea -0x18(%ebp),%eax 80a9f41: e8 aa f6 ff ff call 80a95f0 80a9f46: 89 c2 mov %eax,%edx spin_lock(&hb->lock); head =3D &hb->chain; plist_for_each_entry_safe(this, next, head, list) { 80a9f48: 8b 48 08 mov 0x8(%eax),%ecx 80a9f4b: 83 c2 08 add $0x8,%edx 80a9f4e: 8d 41 f4 lea -0xc(%ecx),%eax 80a9f51: 39 ca cmp %ecx,%edx 80a9f53: 8b 70 0c mov 0xc(%eax),%esi 80a9f56: 74 6a je 80a9fc2 80a9f58: 89 d9 mov %ebx,%ecx 80a9f5a: 83 ee 0c sub $0xc,%esi 80a9f5d: 89 d3 mov %edx,%ebx 80a9f5f: 89 fa mov %edi,%edx 80a9f61: 89 cf mov %ecx,%edi 80a9f63: eb 12 jmp 80a9f77 80a9f65: 8d 76 00 lea 0x0(%esi),%esi 80a9f68: 8d 46 0c lea 0xc(%esi),%eax 80a9f6b: 8b 4e 0c mov 0xc(%esi),%ecx 80a9f6e: 39 c3 cmp %eax,%ebx 80a9f70: 74 4e je 80a9fc0 80a9f72: 89 f0 mov %esi,%eax 80a9f74: 8d 71 f4 lea -0xc(%ecx),%esi if (match_futex (&this->key, &key)) { 80a9f77: 83 f8 e4 cmp $0xffffffe4,%eax 80a9f7a: 74 ec je 80a9f68 80a9f7c: 8b 48 1c mov 0x1c(%eax),%ecx 80a9f7f: 3b 4d e8 cmp -0x18(%ebp),%ecx 80a9f82: 75 e4 jne 80a9f68 /* * Return 1 if two futex_keys are equal, 0 otherwise. */ > Is this really 2.6.39? No, but I didn't want to change the subject line, the bisected version = is : v2.6.38-rc8-1-g2e12978 --=20 MfG/Sincerely Toralf F=F6rster pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel"= in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/