loop5: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.5.772/9936 is trying to acquire lock: ffff888028a860f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa7/0xd10 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff88805aaf87c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1f8/0x1c30 fs/hfsplus/extents.c:453 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:776 hfsplus_get_block+0x398/0x1600 fs/hfsplus/extents.c:260 block_read_full_folio+0x29f/0x830 fs/buffer.c:2420 filemap_read_folio+0x117/0x380 mm/filemap.c:2496 do_read_cache_folio+0x358/0x590 mm/filemap.c:4096 do_read_cache_page mm/filemap.c:4162 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4171 read_mapping_page include/linux/pagemap.h:1011 [inline] hfsplus_block_allocate+0xf3/0xd10 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xa9a/0x1c30 fs/hfsplus/extents.c:464 hfsplus_get_block+0x40a/0x1600 fs/hfsplus/extents.c:245 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145 block_write_begin fs/buffer.c:2256 [inline] cont_write_begin+0x78c/0xb50 fs/buffer.c:2594 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48 cont_expand_zero fs/buffer.c:2555 [inline] cont_write_begin+0x82b/0xb50 fs/buffer.c:2584 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48 generic_cont_expand_simple+0x13f/0x210 fs/buffer.c:2485 hfsplus_setattr+0x169/0x270 fs/hfsplus/inode.c:280 notify_change+0xc1a/0xf40 fs/attr.c:546 do_truncate+0x1a4/0x220 fs/open.c:68 do_ftruncate+0x4a5/0x560 fs/open.c:195 do_sys_ftruncate fs/open.c:207 [inline] __do_sys_ftruncate fs/open.c:212 [inline] __se_sys_ftruncate fs/open.c:210 [inline] __x64_sys_ftruncate+0x92/0xf0 fs/open.c:210 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->alloc_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:776 hfsplus_block_allocate+0xa7/0xd10 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xa9a/0x1c30 fs/hfsplus/extents.c:464 hfsplus_bmap_reserve+0x125/0x510 fs/hfsplus/btree.c:358 hfsplus_rename_cat+0x1b3/0xf40 fs/hfsplus/catalog.c:456 hfsplus_rename+0x135/0x1f0 fs/hfsplus/dir.c:552 vfs_rename+0xbb6/0xee0 fs/namei.c:5995 do_renameat2+0x501/0x950 fs/namei.c:6113 __do_sys_rename fs/namei.c:6156 [inline] __se_sys_rename fs/namei.c:6154 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:6154 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 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(&sbi->alloc_mutex); lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); *** DEADLOCK *** 6 locks held by syz.5.772/9936: #0: ffff88807f634420 (sb_writers#18){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499 #1: ffff88805aaf9738 (&type->i_mutex_dir_key#14/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1073 [inline] #1: ffff88805aaf9738 (&type->i_mutex_dir_key#14/1){+.+.}-{4:4}, at: lock_rename fs/namei.c:3712 [inline] #1: ffff88805aaf9738 (&type->i_mutex_dir_key#14/1){+.+.}-{4:4}, at: __start_renaming+0x148/0x410 fs/namei.c:3808 #2: ffff88805aafab78 (&sb->s_type->i_mutex_key#43){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #2: ffff88805aafab78 (&sb->s_type->i_mutex_key#43){+.+.}-{4:4}, at: lock_two_nondirectories+0xe7/0x180 fs/inode.c:1250 #3: ffff88805aafb238 (&sb->s_type->i_mutex_key#43/4){+.+.}-{4:4}, at: vfs_rename+0x661/0xee0 fs/namei.c:5958 #4: ffff88805afb80b0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28 #5: ffff88805aaf87c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1f8/0x1c30 fs/hfsplus/extents.c:453 stack backtrace: CPU: 1 UID: 0 PID: 9936 Comm: syz.5.772 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:776 hfsplus_block_allocate+0xa7/0xd10 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xa9a/0x1c30 fs/hfsplus/extents.c:464 hfsplus_bmap_reserve+0x125/0x510 fs/hfsplus/btree.c:358 hfsplus_rename_cat+0x1b3/0xf40 fs/hfsplus/catalog.c:456 hfsplus_rename+0x135/0x1f0 fs/hfsplus/dir.c:552 vfs_rename+0xbb6/0xee0 fs/namei.c:5995 do_renameat2+0x501/0x950 fs/namei.c:6113 __do_sys_rename fs/namei.c:6156 [inline] __se_sys_rename fs/namei.c:6154 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:6154 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efd96f8f749 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:00007efd97d8a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007efd971e5fa0 RCX: 00007efd96f8f749 RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000200000000580 RBP: 00007efd97013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efd971e6038 R14: 00007efd971e5fa0 R15: 00007ffdc86b2b08