============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.2.660/13012 is trying to acquire lock: ffff888064f522b8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x391/0x1610 fs/hfsplus/extents.c:262 but task is already holding lock: ffff88805e4587b8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x2d0/0xd20 fs/hfsplus/extents.c:577 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.2.660/13012: #0: ffff88803b368500 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494 #1: ffff88805e458988 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff88805e458988 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: do_truncate+0x18f/0x250 fs/open.c:63 #2: ffff88805e4587b8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x2d0/0xd20 fs/hfsplus/extents.c:577 #3: ffff88802a57d0e8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xc7/0x630 fs/hfsplus/bitmap.c:182 stack backtrace: CPU: 0 UID: 0 PID: 13012 Comm: syz.2.660 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x24df/0x2ce0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/rtmutex_api.c:559 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:578 hfsplus_get_block+0x391/0x1610 fs/hfsplus/extents.c:262 block_read_full_folio+0x29f/0x810 fs/buffer.c:2398 filemap_read_folio+0x12c/0x3a0 mm/filemap.c:2510 do_read_cache_folio+0x2bf/0x560 mm/filemap.c:4140 do_read_cache_page mm/filemap.c:4206 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4215 read_mapping_page include/linux/pagemap.h:1009 [inline] hfsplus_block_free+0x134/0x630 fs/hfsplus/bitmap.c:185 hfsplus_free_extents+0x41f/0xa50 fs/hfsplus/extents.c:372 hfsplus_file_truncate+0x7ef/0xd20 fs/hfsplus/extents.c:593 hfsplus_setattr+0x1b5/0x260 fs/hfsplus/inode.c:320 notify_change+0xbb8/0xec0 fs/attr.c:556 do_truncate+0x1c2/0x250 fs/open.c:68 vfs_truncate+0x4b7/0x540 fs/open.c:118 ksys_truncate+0xf3/0x1c0 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8b734bce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8b71716028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f8b73735fa0 RCX: 00007f8b734bce59 RDX: 0000000000000000 RSI: 00000000000000fe RDI: 0000200000000280 RBP: 00007f8b73552e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8b73736038 R14: 00007f8b73735fa0 R15: 00007ffc0a1a9148 hfsplus: unable to mark blocks free: error -4 hfsplus: can't free extent: start 260, count 1