Messages in this thread | | | Subject | Re: [ramfs] 0858d7da8a: canonical_address#:#[##] | From | yangerkun <> | Date | Fri, 26 Nov 2021 09:54:56 +0800 |
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Cc ntfs3:
Maybe it's a problem like this:
do_new_mount fs_context_for_mount alloc_fs_context ntfs_init_fs_context sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); fc->s_fs_info = sbi; vfs_get_tree ntfs_fs_get_tree get_tree_bdev blkdev_get_by_path // return error and sbi->sb will be NULL put_fs_context ntfs_fs_free put_ntfs ntfs_update_mftmirr struct super_block *sb = sbi->sb; // NULL u32 blocksize = sb->s_blocksize; // BOOM
It's actually a ntfs3 bug which may be introduced by:
610f8f5a7baf fs/ntfs3: Use new api for mounting
On 2021/11/26 2:03, Linus Torvalds wrote: > On Thu, Nov 25, 2021 at 6:08 AM kernel test robot <oliver.sang@intel.com> wrote: >> FYI, we noticed the following commit (built with clang-14): >> >> commit: 0858d7da8a09e440fb192a0239d20249a2d16af8 ("ramfs: fix mount source show for ramfs") > > Funky. That commit seems to have nothing to do with the oops: > >> [ 806.257788][ T204] /dev/root: Can't open blockdev >> [ 806.259101][ T204] general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN >> [ 806.263082][ T204] KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] > > Not a very helpful error message,a nd the KASAN comment makes little sense, but > >> [ 806.267540][ T204] RIP: 0010:ntfs_update_mftmirr (kbuild/src/consumer/fs/ntfs3/fsntfs.c:834) > > That's > > u32 blocksize = sb->s_blocksize; > > and presumably with KASAN you end up getting hat odd 0xdffffc0000000003 thing. > > Anyway, looks like sb is NULL, and the code is > > int ntfs_update_mftmirr(struct ntfs_sb_info *sbi, int wait) > { > int err; > struct super_block *sb = sbi->sb; > u32 blocksize = sb->s_blocksize; > sector_t block1, block2; > > although I have no idea how sbi->sb could be NULL. > > Konstantin? See > > https://lore.kernel.org/lkml/20211125140816.GC3109@xsang-OptiPlex-9020/ > > for the full thing. > > Linus > . >
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