loop0: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
6.14.0-rc7-syzkaller-00069-g81e4f8d68c66 #0 Not tainted
--------------------------------------------
syz.0.0/5330 is trying to acquire lock:
ffff888053011548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260
but task is already holding lock:
ffff8880530107c8 (&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
7 locks held by syz.0.0/5330:
#0: ffff888034daa420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:547
#1: ffff888053011df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#1: ffff888053011df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x260/0x540 fs/namei.c:4082
#2: ffff888053013238 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline]
#2: ffff888053013238 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: vfs_link+0x3b2/0x6e0 fs/namei.c:4786
#3: ffff88805300b998 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_link+0x237/0x800 fs/hfsplus/dir.c:316
#4: ffff888030ef40b0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28
#5: ffff8880530107c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458
#6: ffff88805300b8f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35
stack backtrace:
CPU: 0 UID: 0 PID: 5330 Comm: syz.0.0 Not tainted 6.14.0-rc7-syzkaller-00069-g81e4f8d68c66 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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:3039
check_deadlock kernel/locking/lockdep.c:3091 [inline]
validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3893
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260
block_read_full_folio+0x3ee/0xae0 fs/buffer.c:2396
filemap_read_folio+0x148/0x3b0 mm/filemap.c:2400
do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3884
do_read_cache_page mm/filemap.c:3950 [inline]
read_cache_page+0x5b/0x170 mm/filemap.c:3959
read_mapping_page include/linux/pagemap.h:1017 [inline]
hfsplus_block_allocate+0xee/0x8c0 fs/hfsplus/bitmap.c:37
hfsplus_file_extend+0xade/0x1b70 fs/hfsplus/extents.c:469
hfsplus_bmap_reserve+0x105/0x4e0 fs/hfsplus/btree.c:358
hfsplus_rename_cat+0x1d0/0x1090 fs/hfsplus/catalog.c:456
hfsplus_link+0x3ab/0x800 fs/hfsplus/dir.c:323
vfs_link+0x4f0/0x6e0 fs/namei.c:4795
do_linkat+0x555/0x6f0 fs/namei.c:4865
__do_sys_link fs/namei.c:4899 [inline]
__se_sys_link fs/namei.c:4897 [inline]
__x64_sys_link+0x82/0x90 fs/namei.c:4897
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: 0033:0x7fb70a58d169
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:00007fb70b38b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007fb70a7a5fa0 RCX: 00007fb70a58d169
RDX: 0000000000000000 RSI: 0000400000000840 RDI: 0000400000000a40
RBP: 00007fb70a60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb70a7a5fa0 R15: 00007fff4d204e08
</TASK>