======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.92/6467 is trying to acquire lock:
ffff88810efa2408 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x398/0x15d0

but task is already holding lock:
ffff888104eea8f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa7/0xc40

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sbi->alloc_mutex){+.+.}-{4:4}:
       lock_acquire+0x120/0x360
       __mutex_lock+0x187/0x1350
       hfsplus_block_allocate+0xa7/0xc40
       hfsplus_file_extend+0xa9a/0x1ba0
       hfsplus_get_block+0x40a/0x15d0
       __block_write_begin_int+0x6b5/0x1900
       cont_write_begin+0x789/0xb50
       hfsplus_write_begin+0x66/0xb0
       cont_write_begin+0x2fd/0xb50
       hfsplus_write_begin+0x66/0xb0
       generic_perform_write+0x2c5/0x900
       generic_file_write_iter+0x117/0x550
       vfs_write+0x5c9/0xb30
       __x64_sys_pwrite64+0x193/0x220
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       __mutex_lock+0x187/0x1350
       hfsplus_get_block+0x398/0x15d0
       block_read_full_folio+0x29f/0x830
       filemap_read_folio+0x117/0x380
       do_read_cache_folio+0x350/0x590
       read_cache_page+0x5d/0x170
       hfsplus_block_allocate+0xf3/0xc40
       hfsplus_file_extend+0xa9a/0x1ba0
       hfsplus_get_block+0x40a/0x15d0
       __block_write_begin_int+0x6b5/0x1900
       cont_write_begin+0x789/0xb50
       hfsplus_write_begin+0x66/0xb0
       page_symlink+0x26f/0x430
       hfsplus_symlink+0xca/0x260
       vfs_symlink+0x143/0x2f0
       do_symlinkat+0x1b1/0x3f0
       __x64_sys_symlink+0x7a/0x90
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sbi->alloc_mutex);
                               lock(&HFSPLUS_I(inode)->extents_lock);
                               lock(&sbi->alloc_mutex);
  lock(&HFSPLUS_I(inode)->extents_lock);

 *** DEADLOCK ***

5 locks held by syz.1.92/6467:
 #0: ffff888109722420 (sb_writers#22){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88810efa17f8 (&type->i_mutex_dir_key#14/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0
 #2: ffff888104eea998 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_symlink+0x81/0x260
 #3: ffff88810efa3908 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1f8/0x1ba0
 #4: ffff888104eea8f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa7/0xc40

stack backtrace:
CPU: 0 UID: 0 PID: 6467 Comm: syz.1.92 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_circular_bug+0x2ee/0x310
 check_noncircular+0x134/0x160
 validate_chain+0xb9b/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 __mutex_lock+0x187/0x1350
 hfsplus_get_block+0x398/0x15d0
 block_read_full_folio+0x29f/0x830
 filemap_read_folio+0x117/0x380
 do_read_cache_folio+0x350/0x590
 read_cache_page+0x5d/0x170
 hfsplus_block_allocate+0xf3/0xc40
 hfsplus_file_extend+0xa9a/0x1ba0
 hfsplus_get_block+0x40a/0x15d0
 __block_write_begin_int+0x6b5/0x1900
 cont_write_begin+0x789/0xb50
 hfsplus_write_begin+0x66/0xb0
 page_symlink+0x26f/0x430
 hfsplus_symlink+0xca/0x260
 vfs_symlink+0x143/0x2f0
 do_symlinkat+0x1b1/0x3f0
 __x64_sys_symlink+0x7a/0x90
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a2878f749
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:00007f5a296c0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007f5a289e5fa0 RCX: 00007f5a2878f749
RDX: 0000000000000000 RSI: 0000200000000cc0 RDI: 0000200000000dc0
RBP: 00007f5a28813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a289e6038 R14: 00007f5a289e5fa0 R15: 00007ffe744a23f8
 </TASK>
