loop0: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc1-syzkaller-00235-g9946eaf552b1 #0 Not tainted ------------------------------------------------------ syz.0.0/5319 is trying to acquire lock: ffff8880530070f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff8880433687c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458 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+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:2390 do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3960 do_read_cache_page mm/filemap.c:4026 [inline] read_cache_page+0x5b/0x170 mm/filemap.c:4035 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_get_block+0x406/0x14f0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x692/0x19a0 fs/buffer.c:2116 block_write_begin fs/buffer.c:2226 [inline] cont_write_begin+0x77f/0xb40 fs/buffer.c:2577 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46 page_symlink+0x2a6/0x4a0 fs/namei.c:5422 hfsplus_symlink+0xca/0x270 fs/hfsplus/dir.c:449 vfs_symlink+0x137/0x2e0 fs/namei.c:4671 do_symlinkat+0x222/0x3a0 fs/namei.c:4697 __do_sys_symlink fs/namei.c:4718 [inline] __se_sys_symlink fs/namei.c:4716 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4716 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 -> #0 (&sbi->alloc_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __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_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xade/0x1b70 fs/hfsplus/extents.c:469 hfsplus_bmap_reserve+0x105/0x4e0 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x1b0/0x1b70 fs/hfsplus/catalog.c:272 hfsplus_mknod+0x16a/0x2a0 fs/hfsplus/dir.c:494 lookup_open fs/namei.c:3651 [inline] open_last_lookups fs/namei.c:3750 [inline] path_openat+0x193c/0x3590 fs/namei.c:3986 do_filp_open+0x27f/0x4e0 fs/namei.c:4016 do_sys_openat2+0x13e/0x1d0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_creat fs/open.c:1521 [inline] __se_sys_creat fs/open.c:1515 [inline] __x64_sys_creat+0x123/0x170 fs/open.c:1515 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 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 *** 5 locks held by syz.0.0/5319: #0: ffff888011ca6420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:547 #1: ffff888043369df8 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff888043369df8 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: open_last_lookups fs/namei.c:3747 [inline] #1: ffff888043369df8 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: path_openat+0x89a/0x3590 fs/namei.c:3986 #2: ffff888053007198 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_mknod+0x7e/0x2a0 fs/hfsplus/dir.c:486 #3: ffff8880404ce0b0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28 #4: ffff8880433687c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458 stack backtrace: CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted 6.14.0-rc1-syzkaller-00235-g9946eaf552b1 #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: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __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_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xade/0x1b70 fs/hfsplus/extents.c:469 hfsplus_bmap_reserve+0x105/0x4e0 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x1b0/0x1b70 fs/hfsplus/catalog.c:272 hfsplus_mknod+0x16a/0x2a0 fs/hfsplus/dir.c:494 lookup_open fs/namei.c:3651 [inline] open_last_lookups fs/namei.c:3750 [inline] path_openat+0x193c/0x3590 fs/namei.c:3986 do_filp_open+0x27f/0x4e0 fs/namei.c:4016 do_sys_openat2+0x13e/0x1d0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_creat fs/open.c:1521 [inline] __se_sys_creat fs/open.c:1515 [inline] __x64_sys_creat+0x123/0x170 fs/open.c:1515 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: 0033:0x7f12acf8cde9 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:00007f12add37038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f12ad1a5fa0 RCX: 00007f12acf8cde9 RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000400000000e00 RBP: 00007f12ad00e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f12ad1a5fa0 R15: 00007ffccc15ecb8