====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.335/5270 is trying to acquire lock: ffff0000c3716098 (&new->rf_sem){+.+.}-{3:3}, at: __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:428 [inline] ffff0000c3716098 (&new->rf_sem){+.+.}-{3:3}, at: ocfs2_lock_refcount_tree+0x178/0x93c fs/ocfs2/refcounttree.c:463 but task is already holding lock: ffff0000f7298660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_remap_file_range+0x340/0x64c fs/ocfs2/file.c:2693 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: down_read+0x64/0x300 kernel/locking/rwsem.c:1520 ocfs2_read_virt_blocks+0x238/0x8f0 fs/ocfs2/extent_map.c:984 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x2e4/0x1d6c fs/ocfs2/dir.c:1091 ocfs2_find_files_on_disk+0x128/0x40c fs/ocfs2/dir.c:1995 ocfs2_lookup_ino_from_name+0x60/0x114 fs/ocfs2/dir.c:2017 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x2c0/0x690 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x2a0/0x5c8 fs/ocfs2/super.c:457 ocfs2_initialize_super fs/ocfs2/super.c:2253 [inline] ocfs2_fill_super+0x2408/0x436c fs/ocfs2/super.c:994 mount_bdev+0x264/0x358 fs/super.c:1443 ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1186 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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:585 -> #1 (&osb->system_file_mutex){+.+.}-{3:3}: __mutex_lock_common+0x190/0x1f60 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 ocfs2_get_system_file_inode+0x158/0x690 fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0xfc/0x3c80 fs/ocfs2/suballoc.c:776 ocfs2_reserve_new_metadata_blocks+0x36c/0x830 fs/ocfs2/suballoc.c:978 ocfs2_add_refcount_flag+0x364/0xf00 fs/ocfs2/refcounttree.c:3683 ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4563 [inline] ocfs2_reflink_remap_blocks+0xa98/0x15a8 fs/ocfs2/refcounttree.c:4690 ocfs2_remap_file_range+0x3f8/0x64c fs/ocfs2/file.c:2703 vfs_copy_file_range+0xb38/0x11c8 fs/read_write.c:1518 __do_sys_copy_file_range fs/read_write.c:1596 [inline] __se_sys_copy_file_range fs/read_write.c:1559 [inline] __arm64_sys_copy_file_range+0x500/0x828 fs/read_write.c:1559 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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:585 -> #0 (&new->rf_sem){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:428 [inline] ocfs2_lock_refcount_tree+0x178/0x93c fs/ocfs2/refcounttree.c:463 ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4553 [inline] ocfs2_reflink_remap_blocks+0xa38/0x15a8 fs/ocfs2/refcounttree.c:4690 ocfs2_remap_file_range+0x3f8/0x64c fs/ocfs2/file.c:2703 do_clone_file_range+0x248/0x2a8 fs/remap_range.c:396 vfs_clone_file_range+0x28c/0x730 fs/remap_range.c:414 ioctl_file_clone fs/ioctl.c:239 [inline] ioctl_file_clone_range fs/ioctl.c:258 [inline] do_vfs_ioctl+0x1430/0x2100 fs/ioctl.c:823 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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:585 other info that might help us debug this: Chain exists of: &new->rf_sem --> &osb->system_file_mutex --> &ocfs2_file_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_file_ip_alloc_sem_key); lock(&osb->system_file_mutex); lock(&ocfs2_file_ip_alloc_sem_key); lock(&new->rf_sem); *** DEADLOCK *** 3 locks held by syz.2.335/5270: #0: ffff0000f39ca460 (sb_writers#15){.+.+}-{0:0}, at: ioctl_file_clone fs/ioctl.c:239 [inline] #0: ffff0000f39ca460 (sb_writers#15){.+.+}-{0:0}, at: ioctl_file_clone_range fs/ioctl.c:258 [inline] #0: ffff0000f39ca460 (sb_writers#15){.+.+}-{0:0}, at: do_vfs_ioctl+0x1430/0x2100 fs/ioctl.c:823 #1: ffff0000f72989c8 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000f72989c8 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: lock_two_nondirectories+0xd0/0x128 fs/inode.c:1208 #2: ffff0000f7298660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_remap_file_range+0x340/0x64c fs/ocfs2/file.c:2693 stack backtrace: CPU: 0 PID: 5270 Comm: syz.2.335 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x264/0x2f8 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:428 [inline] ocfs2_lock_refcount_tree+0x178/0x93c fs/ocfs2/refcounttree.c:463 ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4553 [inline] ocfs2_reflink_remap_blocks+0xa38/0x15a8 fs/ocfs2/refcounttree.c:4690 ocfs2_remap_file_range+0x3f8/0x64c fs/ocfs2/file.c:2703 do_clone_file_range+0x248/0x2a8 fs/remap_range.c:396 vfs_clone_file_range+0x28c/0x730 fs/remap_range.c:414 ioctl_file_clone fs/ioctl.c:239 [inline] ioctl_file_clone_range fs/ioctl.c:258 [inline] do_vfs_ioctl+0x1430/0x2100 fs/ioctl.c:823 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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:585