============================================ WARNING: possible recursive locking detected 6.9.0-rc6-syzkaller-00005-gb947cc5bf6d7 #0 Not tainted -------------------------------------------- syz-executor396/5089 is trying to acquire lock: ffff8880234ce0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33 but task is already holding lock: ffff8880234ce0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&tree->tree_lock/1); lock(&tree->tree_lock/1); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz-executor396/5089: #0: ffff8880234ca420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff88807c930fa8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline] #1: ffff88807c930fa8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: generic_file_write_iter+0x92/0x350 mm/filemap.c:4092 #2: ffff88807c930df8 (&HFS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397 #3: ffff8880234ce0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33 #4: ffff8880233b80f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397 stack backtrace: CPU: 1 PID: 5089 Comm: syz-executor396 Not tainted 6.9.0-rc6-syzkaller-00005-gb947cc5bf6d7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain kernel/locking/lockdep.c:3856 [inline] __lock_acquire+0x20e6/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33 hfs_ext_read_extent+0x19c/0x9e0 fs/hfs/extent.c:200 hfs_extend_file+0x4e4/0xb10 fs/hfs/extent.c:401 hfs_bmap_reserve+0x29c/0x380 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x3cf/0x520 fs/hfs/extent.c:121 __hfs_ext_cache_extent fs/hfs/extent.c:174 [inline] hfs_ext_read_extent+0x809/0x9e0 fs/hfs/extent.c:202 hfs_extend_file+0x4e4/0xb10 fs/hfs/extent.c:401 hfs_get_block+0x17f/0x830 fs/hfs/extent.c:353 __block_write_begin_int+0x4fe/0x16e0 fs/buffer.c:2105 __block_write_begin fs/buffer.c:2154 [inline] block_write_begin+0xb1/0x4a0 fs/buffer.c:2213 cont_write_begin+0x53d/0x740 fs/buffer.c:2567 hfs_write_begin+0x87/0x150 fs/hfs/inode.c:53 generic_perform_write+0x275/0x620 mm/filemap.c:3974 __generic_file_write_iter+0x1fd/0x240 mm/filemap.c:4069 generic_file_write_iter+0xe7/0x350 mm/filemap.c:4095 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6de/0x1100 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa9b2fd4a99 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff5f96d858 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0032656c69662f2e RCX: 00007fa9b2fd4a99 RDX: 00000000000ffe00 RSI: 0000000020004200 RDI: 0000000000000004 RBP: 00007fa9b30485f0 R08: 000055556d34a4c0 R09: 000055556d34a4c0 R10: 00000000000002a0 R11: 0000000000000246 R12: 00007fff5f96d880 R13: 00007fff5f96daa8 R14: 431bde82d7b634db R15: 00007fa9b301d03b