====================================================== WARNING: possible circular locking dependency detected 5.15.167-syzkaller #0 Not tainted ------------------------------------------------------ syz.4.61/3890 is trying to acquire lock: ffff888029696898 (&new->rf_sem){+.+.}-{3:3}, at: __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:427 [inline] ffff888029696898 (&new->rf_sem){+.+.}-{3:3}, at: ocfs2_lock_refcount_tree+0x1fa/0xa60 fs/ocfs2/refcounttree.c:462 but task is already holding lock: ffff888061bf22e0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_truncate_file+0x345/0x14f0 fs/ocfs2/file.c:467 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}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x2b3/0xa10 fs/ocfs2/extent_map.c:976 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x437/0x26d0 fs/ocfs2/dir.c:1080 ocfs2_find_files_on_disk+0xea/0x310 fs/ocfs2/dir.c:1982 ocfs2_lookup_ino_from_name+0xad/0x1e0 fs/ocfs2/dir.c:2004 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x314/0x7b0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x328/0x720 fs/ocfs2/super.c:458 ocfs2_initialize_super fs/ocfs2/super.c:2276 [inline] ocfs2_fill_super+0x479e/0x58a0 fs/ocfs2/super.c:995 mount_bdev+0x2c9/0x3f0 fs/super.c:1398 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1528 do_new_mount+0x2ba/0xb40 fs/namespace.c:3005 do_mount fs/namespace.c:3348 [inline] __do_sys_mount fs/namespace.c:3556 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&osb->system_file_mutex){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 ocfs2_get_system_file_inode+0x1a1/0x7b0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0x16b/0x4c70 fs/ocfs2/suballoc.c:776 ocfs2_reserve_new_metadata_blocks+0x418/0x9b0 fs/ocfs2/suballoc.c:978 ocfs2_add_refcount_flag+0x48c/0x10f0 fs/ocfs2/refcounttree.c:3710 ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4569 [inline] ocfs2_reflink_remap_blocks+0xe53/0x1f20 fs/ocfs2/refcounttree.c:4696 ocfs2_remap_file_range+0x5f2/0x8d0 fs/ocfs2/file.c:2691 vfs_copy_file_range+0xfc9/0x14e0 fs/read_write.c:1510 __do_sys_copy_file_range fs/read_write.c:1588 [inline] __se_sys_copy_file_range+0x3ea/0x5d0 fs/read_write.c:1551 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&new->rf_sem){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:427 [inline] ocfs2_lock_refcount_tree+0x1fa/0xa60 fs/ocfs2/refcounttree.c:462 ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3442 [inline] ocfs2_refcount_cow+0x74e/0x1180 fs/ocfs2/refcounttree.c:3503 ocfs2_cow_file_pos+0x3aa/0x4a0 fs/ocfs2/file.c:362 ocfs2_orphan_for_truncate fs/ocfs2/file.c:383 [inline] ocfs2_truncate_file+0x3ad/0x14f0 fs/ocfs2/file.c:496 ocfs2_setattr+0x165e/0x1c70 fs/ocfs2/file.c:1212 notify_change+0xc6d/0xf50 fs/attr.c:505 do_truncate+0x21c/0x300 fs/open.c:65 do_sys_ftruncate+0x2eb/0x390 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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.4.61/3890: #0: ffff88805e670460 (sb_writers#14){.+.+}-{0:0}, at: do_sys_ftruncate+0x25a/0x390 fs/open.c:190 #1: ffff888061bf2648 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #1: ffff888061bf2648 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: do_truncate+0x208/0x300 fs/open.c:63 #2: ffff888061bf22e0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_truncate_file+0x345/0x14f0 fs/ocfs2/file.c:467 stack backtrace: CPU: 0 PID: 3890 Comm: syz.4.61 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 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+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:427 [inline] ocfs2_lock_refcount_tree+0x1fa/0xa60 fs/ocfs2/refcounttree.c:462 ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3442 [inline] ocfs2_refcount_cow+0x74e/0x1180 fs/ocfs2/refcounttree.c:3503 ocfs2_cow_file_pos+0x3aa/0x4a0 fs/ocfs2/file.c:362 ocfs2_orphan_for_truncate fs/ocfs2/file.c:383 [inline] ocfs2_truncate_file+0x3ad/0x14f0 fs/ocfs2/file.c:496 ocfs2_setattr+0x165e/0x1c70 fs/ocfs2/file.c:1212 notify_change+0xc6d/0xf50 fs/attr.c:505 do_truncate+0x21c/0x300 fs/open.c:65 do_sys_ftruncate+0x2eb/0x390 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fbed3afdef9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbed1f76038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 00007fbed3cb5f80 RCX: 00007fbed3afdef9 RDX: 0000000000000000 RSI: 00000000000096ef RDI: 0000000000000007 RBP: 00007fbed3b70b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fbed3cb5f80 R15: 00007ffdbab440d8