====================================================== WARNING: possible circular locking dependency detected 6.1.21-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:0/4331 is trying to acquire lock: ffff0000b186bac0 (&rl->lock){++++}-{3:3}, at: ntfs_read_block fs/ntfs/aops.c:248 [inline] ffff0000b186bac0 (&rl->lock){++++}-{3:3}, at: ntfs_read_folio+0xf40/0x1d70 fs/ntfs/aops.c:436 but task is already holding lock: ffff00003ff7e490 (&ni->mrec_lock){+.+.}-{3:3}, at: map_mft_record+0x64/0x7b4 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+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 map_mft_record+0x64/0x7b4 fs/ntfs/mft.c:154 ntfs_attr_extend_allocation+0x458/0x3470 fs/ntfs/attrib.c:2002 ntfs_prepare_file_for_write fs/ntfs/file.c:391 [inline] ntfs_file_write_iter+0x2c8/0x17b0 fs/ntfs/file.c:1915 call_write_iter include/linux/fs.h:2205 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x610/0x914 fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 -> #0 (&rl->lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 down_read+0x5c/0x78 kernel/locking/rwsem.c:1520 ntfs_read_block fs/ntfs/aops.c:248 [inline] ntfs_read_folio+0xf40/0x1d70 fs/ntfs/aops.c:436 filemap_read_folio+0x14c/0x39c mm/filemap.c:2407 do_read_cache_folio+0x24c/0x544 mm/filemap.c:3535 do_read_cache_page mm/filemap.c:3577 [inline] read_cache_page+0x6c/0x180 mm/filemap.c:3586 read_mapping_page include/linux/pagemap.h:756 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] ntfs_sync_mft_mirror+0x1cc/0x1890 fs/ntfs/mft.c:480 write_mft_record_nolock+0x100c/0x1630 fs/ntfs/mft.c:787 write_mft_record+0x144/0x1bc fs/ntfs/mft.h:95 __ntfs_write_inode+0x5cc/0xa78 fs/ntfs/inode.c:3050 ntfs_write_inode+0x68/0x90 fs/ntfs/super.c:2656 write_inode fs/fs-writeback.c:1440 [inline] __writeback_single_inode+0x614/0x1770 fs/fs-writeback.c:1652 writeback_sb_inodes+0x978/0x16c0 fs/fs-writeback.c:1878 wb_writeback+0x414/0x1130 fs/fs-writeback.c:2052 wb_do_writeback fs/fs-writeback.c:2195 [inline] wb_workfn+0x3a8/0x1034 fs/fs-writeback.c:2235 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 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); lock(&rl->lock); *** DEADLOCK *** 3 locks held by kworker/u4:0/4331: #0: ffff0000c0e3d938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2262 #1: ffff80001dca7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2264 #2: ffff00003ff7e490 (&ni->mrec_lock){+.+.}-{3:3}, at: map_mft_record+0x64/0x7b4 fs/ntfs/mft.c:154 stack backtrace: CPU: 0 PID: 4331 Comm: kworker/u4:0 Not tainted 6.1.21-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Workqueue: writeback wb_workfn (flush-7:0) Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2056 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 down_read+0x5c/0x78 kernel/locking/rwsem.c:1520 ntfs_read_block fs/ntfs/aops.c:248 [inline] ntfs_read_folio+0xf40/0x1d70 fs/ntfs/aops.c:436 filemap_read_folio+0x14c/0x39c mm/filemap.c:2407 do_read_cache_folio+0x24c/0x544 mm/filemap.c:3535 do_read_cache_page mm/filemap.c:3577 [inline] read_cache_page+0x6c/0x180 mm/filemap.c:3586 read_mapping_page include/linux/pagemap.h:756 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] ntfs_sync_mft_mirror+0x1cc/0x1890 fs/ntfs/mft.c:480 write_mft_record_nolock+0x100c/0x1630 fs/ntfs/mft.c:787 write_mft_record+0x144/0x1bc fs/ntfs/mft.h:95 __ntfs_write_inode+0x5cc/0xa78 fs/ntfs/inode.c:3050 ntfs_write_inode+0x68/0x90 fs/ntfs/super.c:2656 write_inode fs/fs-writeback.c:1440 [inline] __writeback_single_inode+0x614/0x1770 fs/fs-writeback.c:1652 writeback_sb_inodes+0x978/0x16c0 fs/fs-writeback.c:1878 wb_writeback+0x414/0x1130 fs/fs-writeback.c:2052 wb_do_writeback fs/fs-writeback.c:2195 [inline] wb_workfn+0x3a8/0x1034 fs/fs-writeback.c:2235 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860