loop0: detected capacity change from 0 to 1024 netlink: 276 bytes leftover after parsing attributes in process `syz.0.0'. /dev/loop0: Can't open blockdev ====================================================== WARNING: possible circular locking dependency detected 6.16.0-syzkaller-11579-g35a813e010b9 #0 Not tainted ------------------------------------------------------ syz.0.0/5357 is trying to acquire lock: ffff88801a2820b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x15a/0x1d0 fs/hfsplus/bfind.c:28 but task is already holding lock: ffff888052c587c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x294/0xb40 fs/hfsplus/extents.c:574 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+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1360 kernel/locking/mutex.c:760 hfsplus_file_extend+0x1fc/0x1990 fs/hfsplus/extents.c:455 hfsplus_bmap_reserve+0x122/0x500 fs/hfsplus/btree.c:358 __hfsplus_ext_write_extent+0x28d/0x5b0 fs/hfsplus/extents.c:104 __hfsplus_ext_cache_extent+0x89/0xe30 fs/hfsplus/extents.c:186 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline] hfsplus_file_extend+0x444/0x1990 fs/hfsplus/extents.c:459 hfsplus_get_block+0x411/0x1530 fs/hfsplus/extents.c:245 __block_write_begin_int+0x6b2/0x1900 fs/buffer.c:2145 block_write_begin fs/buffer.c:2256 [inline] cont_write_begin+0x789/0xb50 fs/buffer.c:2594 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48 generic_perform_write+0x2c2/0x900 mm/filemap.c:4175 generic_file_write_iter+0x117/0x550 mm/filemap.c:4318 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x54b/0xa90 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&tree->tree_lock/1){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1360 kernel/locking/mutex.c:760 hfsplus_find_init+0x15a/0x1d0 fs/hfsplus/bfind.c:28 hfsplus_file_truncate+0x383/0xb40 fs/hfsplus/extents.c:580 hfsplus_delete_inode+0x180/0x230 fs/hfsplus/inode.c:-1 hfsplus_unlink+0x4e3/0x730 fs/hfsplus/dir.c:405 hfsplus_rename+0xcb/0x1c0 fs/hfsplus/dir.c:547 vfs_rename+0xbda/0xf00 fs/namei.c:5129 do_renameat2+0x6ce/0xa80 fs/namei.c:5278 __do_sys_rename fs/namei.c:5325 [inline] __se_sys_rename fs/namei.c:5323 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5323 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 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(&tree->tree_lock/1); lock(&HFSPLUS_I(inode)->extents_lock); lock(&tree->tree_lock/1); *** DEADLOCK *** 6 locks held by syz.0.0/5357: #0: ffff88801ed1e428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff888052c21df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #1: ffff888052c21df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: lock_rename fs/namei.c:3272 [inline] #1: ffff888052c21df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: do_renameat2+0x3b9/0xa80 fs/namei.c:5224 #2: ffff888052c582f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #2: ffff888052c582f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: lock_two_nondirectories+0xe7/0x180 fs/inode.c:1232 #3: ffff888052c589b8 (&sb->s_type->i_mutex_key#20/4){+.+.}-{4:4}, at: vfs_rename+0x6d8/0xf00 fs/namei.c:5100 #4: ffff888052c1c198 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_unlink+0x160/0x730 fs/hfsplus/dir.c:370 #5: ffff888052c587c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x294/0xb40 fs/hfsplus/extents.c:574 stack backtrace: CPU: 0 UID: 0 PID: 5357 Comm: syz.0.0 Not tainted 6.16.0-syzkaller-11579-g35a813e010b9 #0 PREEMPT(full) 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_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 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+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1360 kernel/locking/mutex.c:760 hfsplus_find_init+0x15a/0x1d0 fs/hfsplus/bfind.c:28 hfsplus_file_truncate+0x383/0xb40 fs/hfsplus/extents.c:580 hfsplus_delete_inode+0x180/0x230 fs/hfsplus/inode.c:-1 hfsplus_unlink+0x4e3/0x730 fs/hfsplus/dir.c:405 hfsplus_rename+0xcb/0x1c0 fs/hfsplus/dir.c:547 vfs_rename+0xbda/0xf00 fs/namei.c:5129 do_renameat2+0x6ce/0xa80 fs/namei.c:5278 __do_sys_rename fs/namei.c:5325 [inline] __se_sys_rename fs/namei.c:5323 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5323 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5eb638eb69 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:00007f5eb7294038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007f5eb65b5fa0 RCX: 00007f5eb638eb69 RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000200000000000 RBP: 00007f5eb6411df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5eb65b5fa0 R15: 00007fff1bf70eb8