====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc7-syzkaller-g707081b61156 #0 Not tainted ------------------------------------------------------ syz-executor.1/7187 is trying to acquire lock: ffff00012c234b40 (&rl->lock){++++}-{3:3}, at: ntfs_read_block fs/ntfs/aops.c:242 [inline] ffff00012c234b40 (&rl->lock){++++}-{3:3}, at: ntfs_read_folio+0xd84/0x1c08 fs/ntfs/aops.c:430 but task is already holding lock: ffff00012c237510 (&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:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 map_mft_record+0x64/0x7b4 fs/ntfs/mft.c:154 ntfs_truncate+0x1d0/0x2130 fs/ntfs/inode.c:2383 ntfs_truncate_vfs fs/ntfs/inode.c:2864 [inline] ntfs_setattr+0x368/0x428 fs/ntfs/inode.c:2916 notify_change+0x9d4/0xc8c fs/attr.c:499 do_truncate+0x1c0/0x28c fs/open.c:66 vfs_truncate+0x2b8/0x360 fs/open.c:112 do_sys_truncate+0xec/0x1b4 fs/open.c:135 __do_sys_truncate fs/open.c:147 [inline] __se_sys_truncate fs/open.c:145 [inline] __arm64_sys_truncate+0x5c/0x70 fs/open.c:145 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 -> #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+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 down_read+0x58/0x2fc kernel/locking/rwsem.c:1526 ntfs_read_block fs/ntfs/aops.c:242 [inline] ntfs_read_folio+0xd84/0x1c08 fs/ntfs/aops.c:430 filemap_read_folio+0x14c/0x39c mm/filemap.c:2324 do_read_cache_folio+0x114/0x548 mm/filemap.c:3703 do_read_cache_page mm/filemap.c:3769 [inline] read_cache_page+0x6c/0x15c mm/filemap.c:3778 read_mapping_page include/linux/pagemap.h:888 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] ntfs_sync_mft_mirror+0x1cc/0x1894 fs/ntfs/mft.c:480 write_mft_record_nolock+0x1254/0x1630 fs/ntfs/mft.c:805 write_mft_record+0x144/0x1bc fs/ntfs/mft.h:95 __ntfs_write_inode+0x5cc/0xa78 fs/ntfs/inode.c:3052 ntfs_commit_inode fs/ntfs/inode.h:300 [inline] ntfs_put_super+0xcc4/0xe28 fs/ntfs/super.c:2315 generic_shutdown_super+0x128/0x2b8 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 deactivate_locked_super+0xc4/0x12c fs/super.c:472 deactivate_super+0xe0/0x100 fs/super.c:505 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1267 __cleanup_mnt+0x20/0x30 fs/namespace.c:1274 task_work_run+0x230/0x2e0 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x618/0x1f64 kernel/exit.c:871 do_group_exit+0x194/0x22c kernel/exit.c:1020 get_signal+0x1500/0x15ec kernel/signal.c:2893 do_signal+0x238/0x3e8c arch/arm64/kernel/signal.c:1308 do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 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 *** 2 locks held by syz-executor.1/7187: #0: ffff0000da0840e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff0000da0840e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff0000da0840e0 (&type->s_umount_key#70){++++}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:504 #1: ffff00012c237510 (&ni->mrec_lock){+.+.}-{3:3}, at: map_mft_record+0x64/0x7b4 fs/ntfs/mft.c:154 stack backtrace: CPU: 0 PID: 7187 Comm: syz-executor.1 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060 check_noncircular+0x310/0x404 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+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 down_read+0x58/0x2fc kernel/locking/rwsem.c:1526 ntfs_read_block fs/ntfs/aops.c:242 [inline] ntfs_read_folio+0xd84/0x1c08 fs/ntfs/aops.c:430 filemap_read_folio+0x14c/0x39c mm/filemap.c:2324 do_read_cache_folio+0x114/0x548 mm/filemap.c:3703 do_read_cache_page mm/filemap.c:3769 [inline] read_cache_page+0x6c/0x15c mm/filemap.c:3778 read_mapping_page include/linux/pagemap.h:888 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] ntfs_sync_mft_mirror+0x1cc/0x1894 fs/ntfs/mft.c:480 write_mft_record_nolock+0x1254/0x1630 fs/ntfs/mft.c:805 write_mft_record+0x144/0x1bc fs/ntfs/mft.h:95 __ntfs_write_inode+0x5cc/0xa78 fs/ntfs/inode.c:3052 ntfs_commit_inode fs/ntfs/inode.h:300 [inline] ntfs_put_super+0xcc4/0xe28 fs/ntfs/super.c:2315 generic_shutdown_super+0x128/0x2b8 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 deactivate_locked_super+0xc4/0x12c fs/super.c:472 deactivate_super+0xe0/0x100 fs/super.c:505 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1267 __cleanup_mnt+0x20/0x30 fs/namespace.c:1274 task_work_run+0x230/0x2e0 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x618/0x1f64 kernel/exit.c:871 do_group_exit+0x194/0x22c kernel/exit.c:1020 get_signal+0x1500/0x15ec kernel/signal.c:2893 do_signal+0x238/0x3e8c arch/arm64/kernel/signal.c:1308 do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598