====================================================== WARNING: possible circular locking dependency detected 6.7.0-rc2-syzkaller-00265-gd2da77f431ac #0 Not tainted ------------------------------------------------------ kworker/u4:1/5109 is trying to acquire lock: ffff8880761c6400 (&rl->lock){++++}-{3:3}, at: ntfs_read_block fs/ntfs/aops.c:242 [inline] ffff8880761c6400 (&rl->lock){++++}-{3:3}, at: ntfs_read_folio+0x1a98/0x2430 fs/ntfs/aops.c:430 but task is already holding lock: ffff8880646d89d0 (&ni->mrec_lock){+.+.}-{3:3}, at: map_mft_record+0x4a/0x730 fs/ntfs/mft.c:154 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->mrec_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:747 map_mft_record+0x4a/0x730 fs/ntfs/mft.c:154 ntfs_attr_extend_allocation+0x268/0x3840 fs/ntfs/attrib.c:2002 ntfs_prepare_file_for_write fs/ntfs/file.c:391 [inline] ntfs_file_write_iter+0xaa0/0x2070 fs/ntfs/file.c:1907 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x64f/0xdf0 fs/read_write.c:584 ksys_write+0x12f/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #0 (&rl->lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2433/0x3b20 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 down_read+0x9a/0x330 kernel/locking/rwsem.c:1526 ntfs_read_block fs/ntfs/aops.c:242 [inline] ntfs_read_folio+0x1a98/0x2430 fs/ntfs/aops.c:430 filemap_read_folio+0xe9/0x2c0 mm/filemap.c:2323 do_read_cache_folio+0x205/0x540 mm/filemap.c:3691 do_read_cache_page mm/filemap.c:3757 [inline] read_cache_page+0x5b/0x160 mm/filemap.c:3766 read_mapping_page include/linux/pagemap.h:871 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] ntfs_sync_mft_mirror+0x242/0x1ed0 fs/ntfs/mft.c:480 write_mft_record_nolock+0x1977/0x1da0 fs/ntfs/mft.c:787 write_mft_record+0x14b/0x380 fs/ntfs/mft.h:95 __ntfs_write_inode+0x91b/0xc30 fs/ntfs/inode.c:3052 write_inode fs/fs-writeback.c:1473 [inline] __writeback_single_inode+0xa91/0xe90 fs/fs-writeback.c:1690 writeback_sb_inodes+0x599/0x1080 fs/fs-writeback.c:1916 wb_writeback+0x2a5/0xaa0 fs/fs-writeback.c:2092 wb_do_writeback fs/fs-writeback.c:2239 [inline] wb_workfn+0x29c/0xfe0 fs/fs-writeback.c:2279 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ni->mrec_lock); lock(&rl->lock); lock(&ni->mrec_lock); rlock(&rl->lock); *** DEADLOCK *** 3 locks held by kworker/u4:1/5109: #0: ffff888140054138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2605 #1: ffffc90004477d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2606 #2: ffff8880646d89d0 (&ni->mrec_lock){+.+.}-{3:3}, at: map_mft_record+0x4a/0x730 fs/ntfs/mft.c:154 stack backtrace: CPU: 1 PID: 5109 Comm: kworker/u4:1 Not tainted 6.7.0-rc2-syzkaller-00265-gd2da77f431ac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: writeback wb_workfn (flush-7:0) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x317/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2433/0x3b20 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 down_read+0x9a/0x330 kernel/locking/rwsem.c:1526 ntfs_read_block fs/ntfs/aops.c:242 [inline] ntfs_read_folio+0x1a98/0x2430 fs/ntfs/aops.c:430 filemap_read_folio+0xe9/0x2c0 mm/filemap.c:2323 do_read_cache_folio+0x205/0x540 mm/filemap.c:3691 do_read_cache_page mm/filemap.c:3757 [inline] read_cache_page+0x5b/0x160 mm/filemap.c:3766 read_mapping_page include/linux/pagemap.h:871 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] ntfs_sync_mft_mirror+0x242/0x1ed0 fs/ntfs/mft.c:480 write_mft_record_nolock+0x1977/0x1da0 fs/ntfs/mft.c:787 write_mft_record+0x14b/0x380 fs/ntfs/mft.h:95 __ntfs_write_inode+0x91b/0xc30 fs/ntfs/inode.c:3052 write_inode fs/fs-writeback.c:1473 [inline] __writeback_single_inode+0xa91/0xe90 fs/fs-writeback.c:1690 writeback_sb_inodes+0x599/0x1080 fs/fs-writeback.c:1916 wb_writeback+0x2a5/0xaa0 fs/fs-writeback.c:2092 wb_do_writeback fs/fs-writeback.c:2239 [inline] wb_workfn+0x29c/0xfe0 fs/fs-writeback.c:2279 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242