====================================================== WARNING: possible circular locking dependency detected 5.15.187-syzkaller #0 Not tainted ------------------------------------------------------ syz.5.240/5296 is trying to acquire lock: ffff0000f9575410 (&ni->mrec_lock){+.+.}-{3:3}, at: map_mft_record+0x68/0x740 fs/ntfs/mft.c:154 but task is already holding lock: ffff0000f9575380 (&rl->lock){++++}-{3:3}, at: ntfs_prepare_pages_for_non_resident_write fs/ntfs/file.c:882 [inline] ffff0000f9575380 (&rl->lock){++++}-{3:3}, at: ntfs_perform_write+0x1b9c/0x61a8 fs/ntfs/file.c:1848 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&rl->lock){++++}-{3:3}: down_read+0xc0/0x390 kernel/locking/rwsem.c:1498 ntfs_read_block fs/ntfs/aops.c:248 [inline] ntfs_readpage+0xee8/0x1d94 fs/ntfs/aops.c:435 do_read_cache_page+0x5f4/0x8f8 mm/filemap.c:-1 read_cache_page+0x68/0x88 mm/filemap.c:3574 read_mapping_page include/linux/pagemap.h:515 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] ntfs_sync_mft_mirror+0x1d4/0x16e4 fs/ntfs/mft.c:480 write_mft_record_nolock+0x105c/0x16fc fs/ntfs/mft.c:787 write_mft_record fs/ntfs/mft.h:95 [inline] __ntfs_write_inode+0x6c8/0xd50 fs/ntfs/inode.c:3050 ntfs_write_inode+0x68/0x90 fs/ntfs/super.c:2656 write_inode fs/fs-writeback.c:1495 [inline] __writeback_single_inode+0x560/0x11f0 fs/fs-writeback.c:1705 writeback_sb_inodes+0x7fc/0x1378 fs/fs-writeback.c:1930 wb_writeback+0x3d8/0xe44 fs/fs-writeback.c:2104 wb_do_writeback fs/fs-writeback.c:2247 [inline] wb_workfn+0x350/0xdd8 fs/fs-writeback.c:2288 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855 -> #0 (&ni->mrec_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 map_mft_record+0x68/0x740 fs/ntfs/mft.c:154 ntfs_map_runlist_nolock+0x328/0x1158 fs/ntfs/attrib.c:91 ntfs_prepare_pages_for_non_resident_write fs/ntfs/file.c:886 [inline] ntfs_perform_write+0x1a18/0x61a8 fs/ntfs/file.c:1848 ntfs_file_write_iter+0xfa4/0x1738 fs/ntfs/file.c:1921 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x1c8/0x2fc fs/read_write.c:1025 __do_sys_pwritev2 fs/read_write.c:1084 [inline] __se_sys_pwritev2 fs/read_write.c:1075 [inline] __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rl->lock); lock(&ni->mrec_lock); lock(&rl->lock); lock(&ni->mrec_lock); *** DEADLOCK *** 3 locks held by syz.5.240/5296: #0: ffff0000d38f6460 (sb_writers#28){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:927 [inline] #0: ffff0000d38f6460 (sb_writers#28){.+.+}-{0:0}, at: do_pwritev+0x1b4/0x2fc fs/read_write.c:1025 #1: ffff0000f95756f0 (&sb->s_type->i_mutex_key#32){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff0000f95756f0 (&sb->s_type->i_mutex_key#32){+.+.}-{3:3}, at: ntfs_file_write_iter+0x78/0x1738 fs/ntfs/file.c:1916 #2: ffff0000f9575380 (&rl->lock){++++}-{3:3}, at: ntfs_prepare_pages_for_non_resident_write fs/ntfs/file.c:882 [inline] #2: ffff0000f9575380 (&rl->lock){++++}-{3:3}, at: ntfs_perform_write+0x1b9c/0x61a8 fs/ntfs/file.c:1848 stack backtrace: CPU: 1 PID: 5296 Comm: syz.5.240 Not tainted 5.15.187-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2011 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 map_mft_record+0x68/0x740 fs/ntfs/mft.c:154 ntfs_map_runlist_nolock+0x328/0x1158 fs/ntfs/attrib.c:91 ntfs_prepare_pages_for_non_resident_write fs/ntfs/file.c:886 [inline] ntfs_perform_write+0x1a18/0x61a8 fs/ntfs/file.c:1848 ntfs_file_write_iter+0xfa4/0x1738 fs/ntfs/file.c:1921 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x1c8/0x2fc fs/read_write.c:1025 __do_sys_pwritev2 fs/read_write.c:1084 [inline] __se_sys_pwritev2 fs/read_write.c:1075 [inline] __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584