loop2: detected capacity change from 0 to 64 ====================================================== WARNING: possible circular locking dependency detected 6.1.118-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.5078/16504 is trying to acquire lock: ffff8880736d8778 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xfb/0x1440 fs/hfs/extent.c:397 but task is already holding lock: ffff88807dd1c0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x16a/0x1e0 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&tree->tree_lock/1){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 hfs_find_init+0x16a/0x1e0 hfs_ext_read_extent fs/hfs/extent.c:200 [inline] hfs_extend_file+0x317/0x1440 fs/hfs/extent.c:401 hfs_bmap_reserve+0xd5/0x3f0 fs/hfs/btree.c:234 hfs_cat_move+0x1b7/0x1050 fs/hfs/catalog.c:310 hfs_rename+0x242/0x320 fs/hfs/dir.c:299 vfs_rename+0xd32/0x10f0 fs/namei.c:4874 do_renameat2+0xde0/0x1440 fs/namei.c:5027 __do_sys_rename fs/namei.c:5073 [inline] __se_sys_rename fs/namei.c:5071 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5071 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 hfs_extend_file+0xfb/0x1440 fs/hfs/extent.c:397 hfs_bmap_reserve+0xd5/0x3f0 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x22e/0x4f0 fs/hfs/extent.c:121 __hfs_ext_cache_extent+0x6a/0x990 fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x340/0x1440 fs/hfs/extent.c:401 hfs_get_block+0x3e0/0xb60 fs/hfs/extent.c:353 __block_write_begin_int+0x544/0x1a30 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x98/0x1f0 fs/buffer.c:2102 cont_write_begin+0x63f/0x880 fs/buffer.c:2456 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 cont_expand_zero fs/buffer.c:2383 [inline] cont_write_begin+0x312/0x880 fs/buffer.c:2446 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 hfs_file_truncate+0x1e9/0xa10 fs/hfs/extent.c:494 hfs_inode_setattr+0x45d/0x6a0 fs/hfs/inode.c:659 notify_change+0xce3/0xfc0 fs/attr.c:499 do_truncate+0x21c/0x300 fs/open.c:65 do_sys_ftruncate+0x2e2/0x380 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&tree->tree_lock/1); lock(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock/1); lock(&HFS_I(tree->inode)->extents_lock); *** DEADLOCK *** 4 locks held by syz.2.5078/16504: #0: ffff888071734460 (sb_writers#20){.+.+}-{0:0}, at: do_sys_ftruncate+0x251/0x380 fs/open.c:190 #1: ffff8880736d9628 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff8880736d9628 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: do_truncate+0x208/0x300 fs/open.c:63 #2: ffff8880736d9478 (&HFS_I(inode)->extents_lock#2){+.+.}-{3:3}, at: hfs_extend_file+0xfb/0x1440 fs/hfs/extent.c:397 #3: ffff88807dd1c0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x16a/0x1e0 stack backtrace: CPU: 1 PID: 16504 Comm: syz.2.5078 Not tainted 6.1.118-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 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+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 hfs_extend_file+0xfb/0x1440 fs/hfs/extent.c:397 hfs_bmap_reserve+0xd5/0x3f0 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x22e/0x4f0 fs/hfs/extent.c:121 __hfs_ext_cache_extent+0x6a/0x990 fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x340/0x1440 fs/hfs/extent.c:401 hfs_get_block+0x3e0/0xb60 fs/hfs/extent.c:353 __block_write_begin_int+0x544/0x1a30 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x98/0x1f0 fs/buffer.c:2102 cont_write_begin+0x63f/0x880 fs/buffer.c:2456 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 cont_expand_zero fs/buffer.c:2383 [inline] cont_write_begin+0x312/0x880 fs/buffer.c:2446 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 hfs_file_truncate+0x1e9/0xa10 fs/hfs/extent.c:494 hfs_inode_setattr+0x45d/0x6a0 fs/hfs/inode.c:659 notify_change+0xce3/0xfc0 fs/attr.c:499 do_truncate+0x21c/0x300 fs/open.c:65 do_sys_ftruncate+0x2e2/0x380 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fd29597e759 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:00007fd2966c7038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 00007fd295b35f80 RCX: 00007fd29597e759 RDX: 0000000000000000 RSI: 0000000002000009 RDI: 0000000000000004 RBP: 00007fd2959f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd295b35f80 R15: 00007ffdbe6ad168