============================================ WARNING: possible recursive locking detected 4.14.301-syzkaller #0 Not tainted -------------------------------------------- syz-executor347/7979 is trying to acquire lock: (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: [] hfsplus_get_block+0x1f9/0x820 fs/hfsplus/extents.c:260 but task is already holding lock: (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: [] hfsplus_file_truncate+0x1ba/0xe80 fs/hfsplus/extents.c:571 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 8 locks held by syz-executor347/7979: #0: (sb_writers#10){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&type->i_mutex_dir_key#7/1){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #1: (&type->i_mutex_dir_key#7/1){+.+.}, at: [] lock_rename+0x225/0x280 fs/namei.c:2885 #2: (&sb->s_type->i_mutex_key#18){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] #2: (&sb->s_type->i_mutex_key#18){+.+.}, at: [] lock_two_nondirectories+0xca/0xf0 fs/inode.c:989 #3: (&sb->s_type->i_mutex_key#17/4){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #3: (&sb->s_type->i_mutex_key#17/4){+.+.}, at: [] lock_two_nondirectories+0xb2/0xf0 fs/inode.c:991 #4: (&sbi->vh_mutex){+.+.}, at: [] hfsplus_unlink+0x112/0x6b0 fs/hfsplus/dir.c:372 #5: (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: [] hfsplus_file_truncate+0x1ba/0xe80 fs/hfsplus/extents.c:571 #6: (&tree->tree_lock/1){+.+.}, at: [] hfsplus_find_init+0x161/0x220 fs/hfsplus/bfind.c:33 #7: (&sbi->alloc_mutex){+.+.}, at: [] hfsplus_block_free+0xc7/0x560 fs/hfsplus/bitmap.c:182 stack backtrace: CPU: 0 PID: 7979 Comm: syz-executor347 Not tainted 4.14.301-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_deadlock_bug kernel/locking/lockdep.c:1800 [inline] check_deadlock kernel/locking/lockdep.c:1847 [inline] validate_chain kernel/locking/lockdep.c:2448 [inline] __lock_acquire.cold+0x180/0x97c kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 hfsplus_get_block+0x1f9/0x820 fs/hfsplus/extents.c:260 block_read_full_page+0x25e/0x8d0 fs/buffer.c:2316 do_read_cache_page+0x38e/0xc10 mm/filemap.c:2713 read_mapping_page include/linux/pagemap.h:398 [inline] hfsplus_block_free+0x177/0x560 fs/hfsplus/bitmap.c:185 hfsplus_free_extents+0x170/0x440 fs/hfsplus/extents.c:360 hfsplus_file_truncate+0xbc0/0xe80 fs/hfsplus/extents.c:585 hfsplus_delete_inode+0x160/0x1f0 fs/hfsplus/inode.c:431 hfsplus_unlink+0x48c/0x6b0 fs/hfsplus/dir.c:407 hfsplus_rename+0x9f/0x1d0 fs/hfsplus/dir.c:547 vfs_rename+0x560/0x1820 fs/namei.c:4498 SYSC_renameat2 fs/namei.c:4646 [inline] SyS_renameat2+0x95b/0xad0 fs/namei.c:4535 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f665753ab89 RSP: 002b:00007fffdc0d9d28 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f665753ab89 RDX: 0000000000000005 RSI: 00000000200001c0 RDI: 0000000000000005 RBP: 00007f66574fa190 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 00007f66574fa220 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000