loop4: detected capacity change from 0 to 64 ====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc1-syzkaller-00068-gbff687b3dad6 #0 Not tainted ------------------------------------------------------ syz-executor.4/21481 is trying to acquire lock: ffff88807a58f5f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0x108/0x1460 fs/hfs/extent.c:397 but task is already holding lock: ffff88808307c0b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x167/0x1e0 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&tree->tree_lock#2/1){+.+.}-{3:3}: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5668 __mutex_lock_common+0x1de/0x26c0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 hfs_find_init+0x167/0x1e0 hfs_ext_read_extent fs/hfs/extent.c:200 [inline] hfs_get_block+0x50d/0xba0 fs/hfs/extent.c:366 block_read_full_folio+0x39d/0xef0 fs/buffer.c:2271 filemap_read_folio+0x1ba/0x7f0 mm/filemap.c:2426 do_read_cache_folio+0x2d3/0x790 mm/filemap.c:3553 do_read_cache_page mm/filemap.c:3595 [inline] read_cache_page+0x56/0x270 mm/filemap.c:3604 read_mapping_page include/linux/pagemap.h:755 [inline] hfs_btree_open+0x50c/0xf20 fs/hfs/btree.c:78 hfs_mdb_get+0x14ec/0x21d0 fs/hfs/mdb.c:204 hfs_fill_super+0x10a2/0x1800 fs/hfs/super.c:406 mount_bdev+0x26c/0x3a0 fs/super.c:1359 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x184a/0x6470 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5668 __mutex_lock_common+0x1de/0x26c0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 hfs_extend_file+0x108/0x1460 fs/hfs/extent.c:397 hfs_bmap_reserve+0xfa/0x410 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x1ea/0x460 fs/hfs/extent.c:121 __hfs_ext_cache_extent+0x67/0x980 fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x39e/0x1460 fs/hfs/extent.c:401 hfs_get_block+0x3ec/0xba0 fs/hfs/extent.c:353 __block_write_begin_int+0x57c/0x1ae0 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x93/0x1e0 fs/buffer.c:2102 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 cont_expand_zero+0x2cc/0x13f0 fs/buffer.c:2383 cont_write_begin+0xac/0x1f0 fs/buffer.c:2446 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 generic_perform_write+0x314/0x610 mm/filemap.c:3772 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3900 generic_file_write_iter+0xab/0x310 mm/filemap.c:3932 do_iter_write+0x6f0/0xc50 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_pwritev+0x219/0x360 fs/read_write.c:1031 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&tree->tree_lock#2/1); lock(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock#2/1); lock(&HFS_I(tree->inode)->extents_lock); *** DEADLOCK *** 4 locks held by syz-executor.4/21481: #0: ffff88803c30c460 (sb_writers#30){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:933 [inline] #0: ffff88803c30c460 (sb_writers#30){.+.+}-{0:0}, at: do_pwritev+0x202/0x360 fs/read_write.c:1031 #1: ffff88807a58e428 (&sb->s_type->i_mutex_key#36){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88807a58e428 (&sb->s_type->i_mutex_key#36){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x310 mm/filemap.c:3929 #2: ffff88807a58e278 (&HFS_I(inode)->extents_lock#2){+.+.}-{3:3}, at: hfs_extend_file+0x108/0x1460 fs/hfs/extent.c:397 #3: ffff88808307c0b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x167/0x1e0 stack backtrace: CPU: 0 PID: 21481 Comm: syz-executor.4 Not tainted 6.2.0-rc1-syzkaller-00068-gbff687b3dad6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f9/0x3b0 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x184a/0x6470 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5668 __mutex_lock_common+0x1de/0x26c0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 hfs_extend_file+0x108/0x1460 fs/hfs/extent.c:397 hfs_bmap_reserve+0xfa/0x410 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x1ea/0x460 fs/hfs/extent.c:121 __hfs_ext_cache_extent+0x67/0x980 fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x39e/0x1460 fs/hfs/extent.c:401 hfs_get_block+0x3ec/0xba0 fs/hfs/extent.c:353 __block_write_begin_int+0x57c/0x1ae0 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x93/0x1e0 fs/buffer.c:2102 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 cont_expand_zero+0x2cc/0x13f0 fs/buffer.c:2383 cont_write_begin+0xac/0x1f0 fs/buffer.c:2446 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 generic_perform_write+0x314/0x610 mm/filemap.c:3772 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3900 generic_file_write_iter+0xab/0x310 mm/filemap.c:3932 do_iter_write+0x6f0/0xc50 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_pwritev+0x219/0x360 fs/read_write.c:1031 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4c2688c0a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4c2758f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f4c269abf80 RCX: 00007f4c2688c0a9 RDX: 0000000000000001 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00007f4c268e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000009b92 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeb178edaf R14: 00007f4c2758f300 R15: 0000000000022000