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0226635c30
syzbot is reporting hung task at do_user_addr_fault() [1], for there is
a silent deadlock between PG_locked bit and ni_lock lock.
Since filemap_update_page() calls filemap_read_folio() after calling
folio_trylock() which will set PG_locked bit, ntfs_truncate() must not
call truncate_setsize() which will wait for PG_locked bit to be cleared
when holding ni_lock lock.
Link: https://lore.kernel.org/all/00000000000060d41f05f139aa44@google.com/
Link: https://syzkaller.appspot.com/bug?extid=bed15dbf10294aa4f2ae [1]
Reported-by: syzbot <syzbot+bed15dbf10294aa4f2ae@syzkaller.appspotmail.com>
Debugged-by: Linus Torvalds <torvalds@linux-foundation.org>
Co-developed-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes:
|
||
|---|---|---|
| .. | ||
| lib | ||
| attrib.c | ||
| attrlist.c | ||
| bitfunc.c | ||
| bitmap.c | ||
| debug.h | ||
| dir.c | ||
| file.c | ||
| frecord.c | ||
| fslog.c | ||
| fsntfs.c | ||
| index.c | ||
| inode.c | ||
| Kconfig | ||
| lznt.c | ||
| Makefile | ||
| namei.c | ||
| ntfs_fs.h | ||
| ntfs.h | ||
| record.c | ||
| run.c | ||
| super.c | ||
| upcase.c | ||
| xattr.c | ||