============================================ WARNING: possible recursive locking detected 6.9.0-rc7-syzkaller-00023-g6d7ddd805123 #0 Not tainted -------------------------------------------- syz-executor116/5184 is trying to acquire lock: ffff8880270e20b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x16e/0x200 fs/hfsplus/bfind.c:33 but task is already holding lock: ffff8880270e20b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x16e/0x200 fs/hfsplus/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-executor116/5184: #0: ffff888025fc6420 (sb_writers#10){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff88801157a4c0 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline] #1: ffff88801157a4c0 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: generic_file_write_iter+0x92/0x350 mm/filemap.c:4092 #2: ffff88801157a2c8 (&hip->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1c1/0x1090 fs/hfsplus/extents.c:457 #3: ffff8880270e20b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x16e/0x200 fs/hfsplus/bfind.c:33 #4: ffff888011578108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1c1/0x1090 fs/hfsplus/extents.c:457 stack backtrace: CPU: 2 PID: 5184 Comm: syz-executor116 Not tainted 6.9.0-rc7-syzkaller-00023-g6d7ddd805123 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 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 hfsplus_find_init+0x16e/0x200 fs/hfsplus/bfind.c:33 hfsplus_ext_read_extent+0x18f/0x250 fs/hfsplus/extents.c:216 hfsplus_file_extend+0x699/0x1090 fs/hfsplus/extents.c:461 hfsplus_bmap_reserve+0x31c/0x410 fs/hfsplus/btree.c:358 __hfsplus_ext_write_extent+0x474/0x5e0 fs/hfsplus/extents.c:104 __hfsplus_ext_cache_extent+0x98/0x9d0 fs/hfsplus/extents.c:186 hfsplus_ext_read_extent+0x200/0x250 fs/hfsplus/extents.c:218 hfsplus_file_extend+0x699/0x1090 fs/hfsplus/extents.c:461 hfsplus_get_block+0x1ae/0x9e0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x4fb/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 hfsplus_write_begin+0x87/0x150 fs/hfsplus/inode.c:47 generic_perform_write+0x272/0x620 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+0x6db/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: 0033:0x7fcd26dff679 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 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:00007ffea9851a78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffea9851c48 RCX: 00007fcd26dff679 RDX: 00000000fffffff0 RSI: 0000000020004200 RDI: 0000000000000004 RBP: 00007fcd26e72610 R08: 0000000000000000 R09: 00007ffea9851c48 R10: 0000000000000647 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffea9851c38 R14: 0000000000000001 R15: 0000000000000001