hfsplus: invalid length 65281 has been corrected to 255
hfsplus: invalid length 65281 has been corrected to 255
hfsplus: invalid length 65281 has been corrected to 255
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.17/4493 is trying to acquire lock:
ffff0000e0f10108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x188/0x1324 fs/hfsplus/extents.c:455

but task is already holding lock:
ffff0000e0f13048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x188/0x1324 fs/hfsplus/extents.c:455

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

4 locks held by syz.0.17/4493:
 #0: ffff0000d5a7a460 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:402
 #1: ffff0000e0f13240 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff0000e0f13240 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: do_truncate+0x174/0x20c fs/open.c:63
 #2: ffff0000e0f13048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x188/0x1324 fs/hfsplus/extents.c:455
 #3: ffff0000d490c0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28

stack backtrace:
CPU: 1 PID: 4493 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 __lock_acquire+0x15d0/0x6634 kernel/locking/lockdep.c:-1
 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676
 __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 hfsplus_file_extend+0x188/0x1324 fs/hfsplus/extents.c:455
 hfsplus_bmap_reserve+0xd0/0x458 fs/hfsplus/btree.c:358
 __hfsplus_ext_write_extent+0x1e4/0x4b0 fs/hfsplus/extents.c:104
 __hfsplus_ext_cache_extent+0x84/0x924 fs/hfsplus/extents.c:186
 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
 hfsplus_file_extend+0x388/0x1324 fs/hfsplus/extents.c:459
 hfsplus_get_block+0x318/0x11a0 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x3d8/0x13c0 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin fs/buffer.c:2102 [inline]
 cont_write_begin+0x5b4/0x820 fs/buffer.c:2456
 hfsplus_write_begin+0x98/0xe4 fs/hfsplus/inode.c:52
 cont_expand_zero fs/buffer.c:2383 [inline]
 cont_write_begin+0x290/0x820 fs/buffer.c:2446
 hfsplus_write_begin+0x98/0xe4 fs/hfsplus/inode.c:52
 generic_cont_expand_simple+0x130/0x208 fs/buffer.c:2347
 hfsplus_setattr+0x14c/0x25c fs/hfsplus/inode.c:283
 notify_change+0xb5c/0xe20 fs/attr.c:499
 do_truncate+0x188/0x20c fs/open.c:65
 vfs_truncate+0x23c/0x2b0 fs/open.c:111
 do_sys_truncate+0xec/0x1b4 fs/open.c:134
 __do_sys_truncate fs/open.c:146 [inline]
 __se_sys_truncate fs/open.c:144 [inline]
 __arm64_sys_truncate+0x5c/0x70 fs/open.c:144
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585