loop0: detected capacity change from 0 to 1024 ============================================ WARNING: possible recursive locking detected 6.11.0-rc3-next-20240812-syzkaller #0 Not tainted -------------------------------------------- syz.0.577/10926 is trying to acquire lock: ffff88807e371548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260 but task is already holding lock: ffff88807e3707c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458 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 5 locks held by syz.0.577/10926: #0: ffff88802e0e00e0 (&type->s_umount_key#65/1){+.+.}-{3:3}, at: alloc_super+0x221/0x9d0 fs/super.c:344 #1: ffff88806ae31198 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_fill_super+0x1380/0x1ca0 fs/hfsplus/super.c:559 #2: ffff88806b14a0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28 #3: ffff88807e3707c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458 #4: ffff88806ae310f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 stack backtrace: CPU: 1 UID: 0 PID: 10926 Comm: syz.0.577 Not tainted 6.11.0-rc3-next-20240812-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 check_deadlock kernel/locking/lockdep.c:3064 [inline] validate_chain+0x15d3/0x5900 kernel/locking/lockdep.c:3858 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5145 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260 block_read_full_folio+0x418/0xcd0 fs/buffer.c:2405 filemap_read_folio+0x14b/0x630 mm/filemap.c:2351 do_read_cache_folio+0x134/0x820 mm/filemap.c:3785 do_read_cache_page+0x30/0x200 mm/filemap.c:3851 read_mapping_page include/linux/pagemap.h:907 [inline] hfsplus_block_allocate+0xee/0x8c0 fs/hfsplus/bitmap.c:37 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_fill_super+0x13ee/0x1ca0 fs/hfsplus/super.c:566 mount_bdev+0x20a/0x2d0 fs/super.c:1679 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 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: 0033:0x7f071f17b0fa Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 7e 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f071fe7de68 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f071fe7def0 RCX: 00007f071f17b0fa RDX: 0000000020000000 RSI: 0000000020000080 RDI: 00007f071fe7deb0 RBP: 0000000020000000 R08: 00007f071fe7def0 R09: 0000000002000010 R10: 0000000002000010 R11: 0000000000000202 R12: 0000000020000080 R13: 00007f071fe7deb0 R14: 00000000000006b2 R15: 0000000020000100