From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Dr. Ernst Molitor" Subject: Linux-2.6.0-test4: Kernel Panic in scsi_host_dev_release Date: Mon, 25 Aug 2003 22:54:09 +0200 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <1061844849.486.12.camel@felicia> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from mailout06.sul.t-online.com ([194.25.134.19]:40654 "EHLO mailout06.sul.t-online.com") by vger.kernel.org with ESMTP id S262328AbTHYUyR (ORCPT ); Mon, 25 Aug 2003 16:54:17 -0400 List-Id: linux-scsi@vger.kernel.org To: James.Bottomley@SteelEye.com Cc: linux-scsi@vger.kernel.org, "Dr. Ernst Molitor" Dear James E.J. Bottomley, while Linux-2.6.0-test3 runs like a charm on my (testbed) box, I ran into a kernel panic with Linux-2.6.0-test4 (and 2.6.0-test4-bk4). The call trace is: scsi_host_dev_release device_releases kobject_cleanup aha1542_detect init_this_scsi_driver do_initcalls init_workqueues init init kernel_thread_helper The last line of the panic says: <0>Kernel Panic: Attempted to kill init! Assuming the problem lies with the scsi subsystem, I thought you might perhaps be able to pinpoint the problem. For what my small knowledge of kernel internals is worth, I looked into the scsi_host_dev_release function new to drivers/scsi/hosts in 2.6.0-test4. This function receives a struct dev * and extracts an Scsi_Host pointer from it via the dev_to_shost macro, which, in fact, is syntactical sugar to the container_of macro. The predecessor of the scsi_host_dev_release function in 2.6.0-test3 was scsi_free_shost (which had a parameter of type Scsi_Host *). The last line of both functions is identical: kfree is called with the pointer shost. From a very superficial analysis, I would feel that freeing *dev rather than *shost would be logical, but I might very well be way off the real source of the panic I have seen. If you'd like me to, I could provide the full kernel panic message (since the system is far from booted when the panic occurrs, I don't have any trace of this on my disks...). Kind regards, Yours Ernst Molitor