From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keith Owens Date: Tue, 26 Jun 2001 14:42:16 +0000 Subject: Re: [Linux-ia64] Help - 2.4.5 SMP doesn't boot (any more) Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org On Tue, 26 Jun 2001 15:59:08 +0200 (CEST), Martin Wilck wrote: >Yesterday I had 2.4.5 running fine. Since today, I can't boot >the 2.4.5 SMP kernel any more. I get a kernel panic (invalid page >request at 0000000000000010) after SMP is enabled >(actually the last message I see is "trying to unmount old root ...", >but from kdb messages and the fact that uniprocessor 2.4.5 boots, it >is clear that it is a SMP error). That sounds like a known bug in 2.4.5 with undefined data in an inode during root switch. Fixed in 2.4.6-pre2. The symptoms can be weird, other people have blamed it on compilers, it is just luck if the undefined field causes a problem or not. Index: 5.1/fs/block_dev.c --- 5.1/fs/block_dev.c Wed, 23 May 2001 11:55:33 +1000 kaos (linux-2.4/p/b/16_block_dev. 1.2.2.3 644) +++ 6-pre5.1/fs/block_dev.c Sat, 09 Jun 2001 11:25:53 +1000 kaos (linux-2.4/p/b/16_block_dev. 1.2.2.4 644) @@ -595,14 +595,15 @@ int check_disk_change(kdev_t dev) int ioctl_by_bdev(struct block_device *bdev, unsigned cmd, unsigned long arg) { - kdev_t rdev = to_kdev_t(bdev->bd_dev); struct inode inode_fake; int res; mm_segment_t old_fs = get_fs(); if (!bdev->bd_op->ioctl) return -EINVAL; - inode_fake.i_rdev=rdev; + memset(&inode_fake, 0, sizeof(inode_fake)); + inode_fake.i_rdev = to_kdev_t(bdev->bd_dev); + inode_fake.i_bdev = bdev; init_waitqueue_head(&inode_fake.i_wait); set_fs(KERNEL_DS); res = bdev->bd_op->ioctl(&inode_fake, NULL, cmd, arg);