loop3: detected capacity change from 0 to 64 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.3.4189/21097 is trying to acquire lock: ffff88804b15c0a8 (&tree->tree_lock#2/1){+.+.}-{4:4}, at: hfs_find_init+0x273/0x330 fs/hfs/bfind.c:36 but task is already holding lock: ffff88807ddd6820 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xa6/0xcf0 fs/hfs/extent.c:397 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 hfs_extend_file+0xa6/0xcf0 fs/hfs/extent.c:397 hfs_bmap_reserve+0x2ab/0x3a0 fs/hfs/btree.c:269 __hfs_ext_write_extent+0x3c4/0x510 fs/hfs/extent.c:121 __hfs_ext_cache_extent fs/hfs/extent.c:174 [inline] hfs_ext_read_extent+0x805/0x9d0 fs/hfs/extent.c:202 hfs_extend_file+0x4ff/0xcf0 fs/hfs/extent.c:401 hfs_get_block+0x17f/0x830 fs/hfs/extent.c:353 __block_write_begin_int+0x57a/0x19c0 fs/buffer.c:2123 block_write_begin+0x9d/0x1d0 fs/buffer.c:2234 cont_write_begin+0x573/0xa10 fs/buffer.c:2596 hfs_write_begin+0x64/0x120 fs/hfs/inode.c:54 cont_expand_zero fs/buffer.c:2524 [inline] cont_write_begin+0x2b9/0xa10 fs/buffer.c:2586 hfs_write_begin+0x64/0x120 fs/hfs/inode.c:54 generic_perform_write+0x292/0xa40 mm/filemap.c:4358 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4475 generic_file_write_iter+0xe1/0x390 mm/filemap.c:4501 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_pwrite64 fs/read_write.c:794 [inline] __do_sys_pwrite64 fs/read_write.c:802 [inline] __se_sys_pwrite64 fs/read_write.c:799 [inline] __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:799 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&tree->tree_lock#2/1){+.+.}-{4:4}: check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165 check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 hfs_find_init+0x273/0x330 fs/hfs/bfind.c:36 hfs_ext_read_extent+0x19d/0x9d0 fs/hfs/extent.c:200 hfs_extend_file+0x4ff/0xcf0 fs/hfs/extent.c:401 hfs_bmap_reserve+0x2ab/0x3a0 fs/hfs/btree.c:269 hfs_cat_create+0x348/0x980 fs/hfs/catalog.c:104 hfs_create+0x7e/0x110 fs/hfs/dir.c:196 lookup_open fs/namei.c:4508 [inline] open_last_lookups fs/namei.c:4608 [inline] path_openat+0x341f/0x4280 fs/namei.c:4860 do_file_open+0x20e/0x430 fs/namei.c:4892 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 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(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock#2/1); lock(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock#2/1); *** DEADLOCK *** 4 locks held by syz.3.4189/21097: #0: ffff888054aaa450 (sb_writers#33){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:4597 [inline] #0: ffff888054aaa450 (sb_writers#33){.+.+}-{0:0}, at: path_openat+0xad9/0x4280 fs/namei.c:4860 #1: ffff88807ddd1f00 (&type->i_mutex_dir_key#20){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #1: ffff88807ddd1f00 (&type->i_mutex_dir_key#20){+.+.}-{4:4}, at: open_last_lookups fs/namei.c:4605 [inline] #1: ffff88807ddd1f00 (&type->i_mutex_dir_key#20){+.+.}-{4:4}, at: path_openat+0x29f2/0x4280 fs/namei.c:4860 #2: ffff8880264f00a8 (&tree->tree_lock#2){+.+.}-{4:4}, at: hfs_find_init+0x2b0/0x330 fs/hfs/bfind.c:33 #3: ffff88807ddd6820 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xa6/0xcf0 fs/hfs/extent.c:397 stack backtrace: CPU: 1 UID: 0 PID: 21097 Comm: syz.3.4189 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165 check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 hfs_find_init+0x273/0x330 fs/hfs/bfind.c:36 hfs_ext_read_extent+0x19d/0x9d0 fs/hfs/extent.c:200 hfs_extend_file+0x4ff/0xcf0 fs/hfs/extent.c:401 hfs_bmap_reserve+0x2ab/0x3a0 fs/hfs/btree.c:269 hfs_cat_create+0x348/0x980 fs/hfs/catalog.c:104 hfs_create+0x7e/0x110 fs/hfs/dir.c:196 lookup_open fs/namei.c:4508 [inline] open_last_lookups fs/namei.c:4608 [inline] path_openat+0x341f/0x4280 fs/namei.c:4860 do_file_open+0x20e/0x430 fs/namei.c:4892 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8ff179e019 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:00007f8ff2613028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8ff1a25fa0 RCX: 00007f8ff179e019 RDX: 000000000000275a RSI: 0000200000000280 RDI: ffffffffffffff9c RBP: 00007f8ff183500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8ff1a26038 R14: 00007f8ff1a25fa0 R15: 00007ffcf8423ed8