syzbot

hfsplus: xattr searching failed
hfsplus: xattr searching failed
hfsplus: xattr searching failed
hfsplus: xattr searching failed
hfsplus: xattr searching failed
============================================
WARNING: possible recursive locking detected
6.13.0-rc7-syzkaller-00043-g619f0b6fad52 #0 Not tainted
--------------------------------------------
syz-executor794/5820 is trying to acquire lock:
ffff88807f090108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458

but task is already holding lock:
ffff88807f0922c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458

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-executor794/5820:
 #0: ffff88807f980420 (sb_writers#9){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline]
 #0: ffff88807f980420 (sb_writers#9){.+.+}-{0:0}, at: vfs_writev+0x2d1/0xba0 fs/read_write.c:1048
 #1: ffff88807f0924b8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]
 #1: ffff88807f0924b8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: generic_file_write_iter+0x82/0x310 mm/filemap.c:4170
 #2: ffff88807f0922c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458
 #3: ffff88807f0140b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28

stack backtrace:
CPU: 1 UID: 0 PID: 5820 Comm: syz-executor794 Not tainted 6.13.0-rc7-syzkaller-00043-g619f0b6fad52 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037
 check_deadlock kernel/locking/lockdep.c:3089 [inline]
 validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
 hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458
 hfsplus_bmap_reserve+0x105/0x4e0 fs/hfsplus/btree.c:358
 __hfsplus_ext_write_extent+0x2a4/0x5c0 fs/hfsplus/extents.c:104
 __hfsplus_ext_cache_extent+0x84/0xe10 fs/hfsplus/extents.c:186
 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
 hfsplus_file_extend+0x48c/0x1b70 fs/hfsplus/extents.c:462
 hfsplus_get_block+0x406/0x14f0 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x692/0x19a0 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2226 [inline]
 cont_write_begin+0x77f/0xb40 fs/buffer.c:2577
 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46
 cont_expand_zero fs/buffer.c:2504 [inline]
 cont_write_begin+0x32b/0xb40 fs/buffer.c:2567
 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46
 generic_perform_write+0x346/0x990 mm/filemap.c:4046
 generic_file_write_iter+0xae/0x310 mm/filemap.c:4173
 do_iter_readv_writev+0x600/0x880
 vfs_writev+0x376/0xba0 fs/read_write.c:1050
 do_pwritev fs/read_write.c:1146 [inline]
 __do_sys_pwritev2 fs/read_write.c:1204 [inline]
 __se_sys_pwritev2+0x196/0x2b0 fs/read_write.c:1195
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7349063ad9
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:00007ffc9fcbafb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007f7349063ad9
RDX: 0000000000000001 RSI: 00000000200002c0 RDI: 0000000000000004
RBP: 00007f73490d75f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000047fff R11: 0000000000000246 R12: 00007ffc9fcbaff0
R13: 00007ffc9fcbb218 R14: 431bde82d7b634db R15: 00007f73490ac03b
 </TASK>