lookup_slow+0x53/0x70 fs/namei.c:1834
 walk_component+0x2d2/0x400 fs/namei.c:2138
 lookup_last fs/namei.c:2636 [inline]
 path_lookupat+0x163/0x430 fs/namei.c:2660
 filename_lookup+0x212/0x570 fs/namei.c:2689
 filename_removexattr fs/xattr.c:1047 [inline]
 path_removexattrat+0x196/0x690 fs/xattr.c:1088
 __do_sys_removexattr fs/xattr.c:1100 [inline]
 __se_sys_removexattr fs/xattr.c:1097 [inline]
 __x64_sys_removexattr+0x62/0x70 fs/xattr.c:1097
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa5038e969
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:00007ffa5114d038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c5
RAX: ffffffffffffffda RBX: 00007ffa505b5fa0 RCX: 00007ffa5038e969
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000200000000180
RBP: 00007ffa50410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffa505b5fa0 R15: 00007ffc313cac48
 </TASK>
getblk(): invalid block size 512 requested
logical block size: 32768
CPU: 0 UID: 0 PID: 5310 Comm: syz.0.0 Not tainted 6.15.0-rc4-syzkaller-00208-g00b827f0cffa #0 PREEMPT(full) 
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_lvl+0x189/0x250 lib/dump_stack.c:120
 __getblk_slow fs/buffer.c:1133 [inline]
 bdev_getblk+0x59e/0x670 fs/buffer.c:1466
 __bread_gfp+0x89/0x3c0 fs/buffer.c:1520
 sb_bread include/linux/buffer_head.h:348 [inline]
 exfat_get_dentry+0x43a/0x5e0 fs/exfat/dir.c:673
 exfat_find_dir_entry+0x41e/0x1f40 fs/exfat/dir.c:1029
 exfat_find fs/exfat/namei.c:624 [inline]
 exfat_lookup+0x54e/0x1770 fs/exfat/namei.c:727
 __lookup_slow+0x294/0x3d0 fs/namei.c:1817
 lookup_slow+0x53/0x70 fs/namei.c:1834
 walk_component+0x2d2/0x400 fs/namei.c:2138
 lookup_last fs/namei.c:2636 [inline]
 path_lookupat+0x163/0x430 fs/namei.c:2660
 filename_lookup+0x212/0x570 fs/namei.c:2689
 filename_removexattr fs/xattr.c:1047 [inline]
 path_removexattrat+0x196/0x690 fs/xattr.c:1088
 __do_sys_removexattr fs/xattr.c:1100 [inline]
 __se_sys_removexattr fs/xattr.c:1097 [inline]
 __x64_sys_removexattr+0x62/0x70 fs/xattr.c:1097
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa5038e969
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:00007ffa5114d038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c5
RAX: ffffffffffffffda RBX: 00007ffa505b5fa0 RCX: 00007ffa5038e969
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000200000000180
RBP: 00007ffa50410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffa505b5fa0 R15: 00007ffc313cac48
 </TASK>
raw-gadget.0 gadget.0: fail, usb_ep_enable returned -22
loop0: detected capacity change from 0 to 1024
======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc4-syzkaller-00208-g00b827f0cffa #0 Not tainted
------------------------------------------------------
syz.0.0/5310 is trying to acquire lock:
ffff888051fda0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x15a/0x1d0 fs/hfsplus/bfind.c:28

but task is already holding lock:
ffff888051c07708 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x294/0xb40 fs/hfsplus/extents.c:577

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
       hfsplus_file_extend+0x1fc/0x1990 fs/hfsplus/extents.c:458
       hfsplus_bmap_reserve+0x122/0x500 fs/hfsplus/btree.c:358
       __hfsplus_ext_write_extent+0x28d/0x5b0 fs/hfsplus/extents.c:104
       __hfsplus_ext_cache_extent+0x89/0xe30 fs/hfsplus/extents.c:186
       hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
       hfsplus_file_extend+0x444/0x1990 fs/hfsplus/extents.c:462
       hfsplus_get_block+0x411/0x1530 fs/hfsplus/extents.c:245
       __block_write_begin_int+0x6b2/0x1900 fs/buffer.c:2151
       block_write_begin fs/buffer.c:2262 [inline]
       cont_write_begin+0x789/0xb50 fs/buffer.c:2601
       hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:46
       generic_perform_write+0x2c4/0x910 mm/filemap.c:4103
       generic_file_write_iter+0x10f/0x540 mm/filemap.c:4246
       aio_write+0x532/0x790 fs/aio.c:1633
       __io_submit_one fs/aio.c:-1 [inline]
       io_submit_one+0x70a/0x1240 fs/aio.c:2052
       __do_sys_io_submit fs/aio.c:2111 [inline]
       __se_sys_io_submit+0x185/0x2f0 fs/aio.c:2081
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&tree->tree_lock/1){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
       __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
       hfsplus_find_init+0x15a/0x1d0 fs/hfsplus/bfind.c:28
       hfsplus_file_truncate+0x383/0xb40 fs/hfsplus/extents.c:583
       hfsplus_delete_inode+0x180/0x230 fs/hfsplus/inode.c:-1
       hfsplus_unlink+0x4e3/0x730 fs/hfsplus/dir.c:405
       vfs_unlink+0x391/0x650 fs/namei.c:4579
       do_unlinkat+0x350/0x560 fs/namei.c:4643
       __do_sys_unlinkat fs/namei.c:4684 [inline]
       __se_sys_unlinkat fs/namei.c:4677 [inline]
       __x64_sys_unlinkat+0xd3/0xf0 fs/namei.c:4677
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&HFSPLUS_I(inode)->extents_lock);
                               lock(&tree->tree_lock/1);
                               lock(&HFSPLUS_I(inode)->extents_lock);
  lock(&tree->tree_lock/1);

 *** DEADLOCK ***

5 locks held by syz.0.0/5310:
 #0: ffff888051fde420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:556
 #1: ffff888051c05df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:902 [inline]
 #1: ffff888051c05df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: do_unlinkat+0x1bf/0x560 fs/namei.c:4630
 #2: ffff888051c078f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #2: ffff888051c078f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: vfs_unlink+0xf2/0x650 fs/namei.c:4568
 #3: ffff888051ccb998 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_unlink+0x160/0x730 fs/hfsplus/dir.c:370
 #4: ffff888051c07708 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x294/0xb40 fs/hfsplus/extents.c:577

stack backtrace:
CPU: 0 UID: 0 PID: 5310 Comm: syz.0.0 Not tainted 6.15.0-rc4-syzkaller-00208-g00b827f0cffa #0 PREEMPT(full) 
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_lvl+0x189/0x250 lib/dump_stack.c:120
 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079
 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211
 check_prev_add kernel/locking/lockdep.c:3166 [inline]
 check_prevs_add kernel/locking/lockdep.c:3285 [inline]
 validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 __mutex_lock_common kernel/locking/mutex.c:601 [inline]
 __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
 hfsplus_find_init+0x15a/0x1d0 fs/hfsplus/bfind.c:28
 hfsplus_file_truncate+0x383/0xb40 fs/hfsplus/extents.c:583
 hfsplus_delete_inode+0x180/0x230 fs/hfsplus/inode.c:-1
 hfsplus_unlink+0x4e3/0x730 fs/hfsplus/dir.c:405
 vfs_unlink+0x391/0x650 fs/namei.c:4579
 do_unlinkat+0x350/0x560 fs/namei.c:4643
 __do_sys_unlinkat fs/namei.c:4684 [inline]
 __se_sys_unlinkat fs/namei.c:4677 [inline]
 __x64_sys_unlinkat+0xd3/0xf0 fs/namei.c:4677
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa5038e969
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:00007ffa5114d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 00007ffa505b5fa0 RCX: 00007ffa5038e969
RDX: 0000000000000000 RSI: 0000200000000c40 RDI: ffffffffffffff9c
RBP: 00007ffa50410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffa505b5fa0 R15: 00007ffc313cac48
 </TASK>