loop5: detected capacity change from 0 to 1024 ============================================ WARNING: possible recursive locking detected 6.16.0-syzkaller-11568-gd632ab86aff2 #0 Tainted: G W -------------------------------------------- syz.5.109/6665 is trying to acquire lock: ffff888023b0f8f8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x3a0/0x1530 fs/hfsplus/extents.c:260 but task is already holding lock: ffff888023b0bcf8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x294/0xb50 fs/hfsplus/extents.c:574 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.5.109/6665: #0: ffff88803cdd6488 (sb_writers#18){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff888023b0bf58 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:874 [inline] #1: ffff888023b0bf58 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63 #2: ffff888023b0bcf8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x294/0xb50 fs/hfsplus/extents.c:574 #3: ffff88803405d8e8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xbe/0x550 fs/hfsplus/bitmap.c:182 stack backtrace: CPU: 1 UID: 0 PID: 6665 Comm: syz.5.109 Tainted: G W 6.16.0-syzkaller-11568-gd632ab86aff2 #0 PREEMPT_{RT,(full)} Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3895 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/rtmutex_api.c:535 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:547 hfsplus_get_block+0x3a0/0x1530 fs/hfsplus/extents.c:260 block_read_full_folio+0x29c/0x830 fs/buffer.c:2420 filemap_read_folio+0x114/0x380 mm/filemap.c:2413 do_read_cache_folio+0x2ba/0x560 mm/filemap.c:3957 do_read_cache_page mm/filemap.c:4023 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4032 read_mapping_page include/linux/pagemap.h:985 [inline] hfsplus_block_free+0x121/0x550 fs/hfsplus/bitmap.c:185 hfsplus_free_extents+0x10d/0xa60 fs/hfsplus/extents.c:360 hfsplus_file_truncate+0x736/0xb50 fs/hfsplus/extents.c:589 hfsplus_setattr+0x1c4/0x270 fs/hfsplus/inode.c:266 notify_change+0xb31/0xe60 fs/attr.c:552 do_truncate+0x1a4/0x220 fs/open.c:68 handle_truncate fs/namei.c:3508 [inline] do_open fs/namei.c:3891 [inline] path_openat+0x3078/0x3840 fs/namei.c:4046 do_filp_open+0x1fa/0x410 fs/namei.c:4073 do_sys_openat2+0x121/0x1c0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_open fs/open.c:1458 [inline] __se_sys_open fs/open.c:1454 [inline] __x64_sys_open+0x11e/0x150 fs/open.c:1454 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc6649deb69 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:00007fc66283e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fc664c05fa0 RCX: 00007fc6649deb69 RDX: 0000000000000000 RSI: 0000000000080242 RDI: 0000200000000040 RBP: 00007fc664a61df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc664c05fa0 R15: 00007ffd6ac653e8 hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent hfsplus: catalog searching failed