syzbot

hfsplus: xattr searching failed
audit: type=1800 audit(1672670430.063:2): pid=7987 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor294" name="file2" dev="loop0" ino=21 res=0
hfsplus: xattr searching failed
============================================
WARNING: possible recursive locking detected
4.14.302-syzkaller #0 Not tainted
--------------------------------------------
syz-executor294/7987 is trying to acquire lock:
 (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: [<ffffffff81d2e009>] hfsplus_get_block+0x1f9/0x820 fs/hfsplus/extents.c:260

but task is already holding lock:
 (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: [<ffffffff81d2e7ea>] hfsplus_file_truncate+0x1ba/0xe80 fs/hfsplus/extents.c:571

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&HFSPLUS_I(inode)->extents_lock);
  lock(&HFSPLUS_I(inode)->extents_lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

5 locks held by syz-executor294/7987:
 #0:  (sb_writers#10){.+.+}, at: [<ffffffff818e1ffa>] sb_start_write include/linux/fs.h:1551 [inline]
 #0:  (sb_writers#10){.+.+}, at: [<ffffffff818e1ffa>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386
 #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff818674b0>] inode_lock include/linux/fs.h:719 [inline]
 #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff818674b0>] do_truncate+0xf0/0x1a0 fs/open.c:61
 #2:  (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: [<ffffffff81d2e7ea>] hfsplus_file_truncate+0x1ba/0xe80 fs/hfsplus/extents.c:571
 #3:  (&tree->tree_lock/1){+.+.}, at: [<ffffffff81d40441>] hfsplus_find_init+0x161/0x220 fs/hfsplus/bfind.c:33
 #4:  (&sbi->alloc_mutex){+.+.}, at: [<ffffffff81d45fc7>] hfsplus_block_free+0xc7/0x560 fs/hfsplus/bitmap.c:182

stack backtrace:
CPU: 1 PID: 7987 Comm: syz-executor294 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_deadlock_bug kernel/locking/lockdep.c:1800 [inline]
 check_deadlock kernel/locking/lockdep.c:1847 [inline]
 validate_chain kernel/locking/lockdep.c:2448 [inline]
 __lock_acquire.cold+0x180/0x97c kernel/locking/lockdep.c:3491
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __mutex_lock_common kernel/locking/mutex.c:756 [inline]
 __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
 hfsplus_get_block+0x1f9/0x820 fs/hfsplus/extents.c:260
 block_read_full_page+0x25e/0x8d0 fs/buffer.c:2316
 do_read_cache_page+0x38e/0xc10 mm/filemap.c:2713
 read_mapping_page include/linux/pagemap.h:398 [inline]
 hfsplus_block_free+0x177/0x560 fs/hfsplus/bitmap.c:185
 hfsplus_free_extents+0x170/0x440 fs/hfsplus/extents.c:360
 hfsplus_file_truncate+0xbc0/0xe80 fs/hfsplus/extents.c:585
 hfsplus_setattr+0x182/0x310 fs/hfsplus/inode.c:264
 notify_change+0x56b/0xd10 fs/attr.c:315
 do_truncate+0xff/0x1a0 fs/open.c:63
 handle_truncate fs/namei.c:3010 [inline]
 do_last fs/namei.c:3437 [inline]
 path_openat+0x1dcc/0x2970 fs/namei.c:3571
 do_filp_open+0x179/0x3c0 fs/namei.c:3605
 do_sys_open+0x296/0x410 fs/open.c:1081
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f2332fbc789
RSP: 002b:00007fff0c8c27f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0032656c69662f2e RCX: 00007f2332fbc789
RDX: 0000000000000160 RSI: 00000000001a5602 RDI: 00000000200013c0
RBP: 00007f2332f7c020 R08: 00000000000005e1 R09: 0000000000000000
R10: 00007fff0c8c26c0 R11: 0000000000000246 R12: 00007f2332f7c0b0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000