Alexander Kolesen <[email protected]> writes: [Rafael, a new regression]
> Hello. > I've built a kernel from > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git > (Date: Fri Nov 19 19:46:45 2010 -0800) > and got a kernel oops when tried to access to unplugged, > but mounted external usb storage formatted with JFS. Al seems to be the last person who touched it, maybe it's related to his changes, like this one. commit 152a08366671080f27b32e0c411ad620c5f88b57 Author: Al Viro <[email protected]> Date: Sun Jul 25 00:46:55 2010 +0400 new helper: mount_bdev() ... and switch of the obvious get_sb_bdev() users to ->mount() Signed-off-by: Al Viro <[email protected]> > > Steps to reproduce: > mkfs.jfs /dev/sdb1 (unpluggable USB hard drive) > mount /dev/sdb1 /mnt/drive > cd /mnt/drive > touch test > sync > ..unplug a drive > ls > > > Result: > BUG: unable to handle kernel NULL pointer dereference at > 0000000000000020 > IP: __mark_inode_dirty > > Then I got a kernel coredump. Here is a stack trace: > > (gdb) bt > #0 __mark_inode_dirty (inode=0xffff880078fc1490, flags=<value optimized > out>) at fs/fs-writeback.c:990 > #1 0xffffffff810e4990 in mark_inode_dirty_sync (mnt=0xffff88007862fd00, > dentry=<value optimized out>) at include/linux/fs.h:1687 > #2 touch_atime (mnt=0xffff88007862fd00, dentry=<value optimized out>) at > fs/inode.c:1505 > #3 0xffffffff810dfeb4 in file_accessed (file=0xffff88006afed600, > filler=0xffffffff810dfcf8 <filldir>, buf=0xffff88007762bf38) at > include/linux/fs.h:1763 > #4 vfs_readdir (file=0xffff88006afed600, filler=0xffffffff810dfcf8 > <filldir>, buf=0xffff88007762bf38) at fs/readdir.c:41 > #5 0xffffffff810e001a in sys_getdents (fd=<value optimized out>, > dirent=0x1f61468, count=32768) at fs/readdir.c:214 > #6 0xffffffff810279ab in ?? () at arch/x86/kernel/entry_64.S:479 > #7 0x00007f8b23d1a4c5 in ?? () > #8 0x00000000000002bb in ?? () > #9 0x0000000000000000 in ?? () > > (gdb) p bdi > $1 = (struct backing_dev_info *) 0x0 > > (gdb) p inode->i_mapping->backing_dev_info > $15 = (struct backing_dev_info *) 0xffff880078878d48 > > (gdb) p inode->i_sb->s_bdi > $16 = (struct backing_dev_info *) 0x0 > > > I can't do git bisect because on n'th step my system became unbootable. > But 2.6.35 doesn't fall. > > > ------------------------------------------------------------------------------ > Beautiful is writing same markup. Internet Explorer 9 supports > standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. > Spend less time writing and rewriting code and more time creating great > experiences on the web. Be a part of the beta today > http://p.sf.net/sfu/msIE9-sfdev2dev -- [email protected] -- Speaking for myself only. ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today http://p.sf.net/sfu/msIE9-sfdev2dev _______________________________________________ Jfs-discussion mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/jfs-discussion
