============================================ WARNING: possible recursive locking detected 6.10.0-rc1-next-20240531-syzkaller #0 Not tainted -------------------------------------------- syz-executor309/5092 is trying to acquire lock: ffff8880229be0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x16e/0x1f0 but task is already holding lock: ffff8880229be0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x16e/0x1f0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&tree->tree_lock/1); lock(&tree->tree_lock/1); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz-executor309/5092: #0: ffff888022a9c420 (sb_writers#9){.+.+}-{0:0}, at: do_ftruncate+0x294/0x590 fs/open.c:178 #1: ffff888076e28920 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline] #1: ffff888076e28920 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: do_truncate fs/open.c:63 [inline] #1: ffff888076e28920 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: do_ftruncate+0x457/0x590 fs/open.c:181 #2: ffff888076e28778 (&HFS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xff/0x1450 fs/hfs/extent.c:397 #3: ffff8880229be0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x16e/0x1f0 #4: ffff8880226a80f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xff/0x1450 fs/hfs/extent.c:397 stack backtrace: CPU: 1 PID: 5092 Comm: syz-executor309 Not tainted 6.10.0-rc1-next-20240531-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3035 check_deadlock kernel/locking/lockdep.c:3087 [inline] validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3889 __lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5194 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 hfs_find_init+0x16e/0x1f0 hfs_ext_read_extent fs/hfs/extent.c:200 [inline] hfs_extend_file+0x31b/0x1450 fs/hfs/extent.c:401 hfs_bmap_reserve+0xd9/0x400 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x22e/0x4f0 fs/hfs/extent.c:121 __hfs_ext_cache_extent+0x6a/0x990 fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x344/0x1450 fs/hfs/extent.c:401 hfs_get_block+0x3e4/0xb60 fs/hfs/extent.c:353 __block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2128 __block_write_begin fs/buffer.c:2177 [inline] block_write_begin+0x9b/0x1e0 fs/buffer.c:2236 cont_write_begin+0x645/0x890 fs/buffer.c:2590 hfs_write_begin+0x8a/0xd0 fs/hfs/inode.c:53 cont_expand_zero fs/buffer.c:2517 [inline] cont_write_begin+0x319/0x890 fs/buffer.c:2580 hfs_write_begin+0x8a/0xd0 fs/hfs/inode.c:53 hfs_file_truncate+0x1ed/0xa20 fs/hfs/extent.c:494 hfs_inode_setattr+0x458/0x620 fs/hfs/inode.c:652 notify_change+0xb9d/0xe70 fs/attr.c:497 do_truncate fs/open.c:65 [inline] do_ftruncate+0x46b/0x590 fs/open.c:181 do_sys_ftruncate fs/open.c:199 [inline] __do_sys_ftruncate fs/open.c:207 [inline] __se_sys_ftruncate fs/open.c:205 [inline] __x64_sys_ftruncate+0x95/0xf0 fs/open.c:205 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: 0033:0x7fc40c51eb19 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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:00007ffdbb446b88 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc40c51eb19 RDX: 00007fc40c51eb19 RSI: 000000000100c17a RDI: 0000000000000004 RBP: 00007fc40c5925f0 R08: 00005555688eb4c0 R09: 00005555688eb4c0 R10: 00005555688eb4c0 R11: 0000000000000246 R12: 00007ffdbb446bb0 R13: 00007ffdbb446dd8 R14: 431bde82d7b634db R15: 00007fc40c56703b