loop5: detected capacity change from 0 to 64 hfs: unable to locate alternate MDB hfs: continuing without an alternate MDB ====================================================== WARNING: possible circular locking dependency detected 6.4.0-rc6-syzkaller-00279-g8c1f0c38b310 #0 Not tainted ------------------------------------------------------ syz-executor.5/8230 is trying to acquire lock: ffff88807dcab578 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0x97/0xae0 fs/hfs/extent.c:397 but task is already holding lock: ffff88808377a0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x182/0x240 fs/hfs/bfind.c:33 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&tree->tree_lock/1){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 hfs_find_init+0x182/0x240 fs/hfs/bfind.c:33 hfs_ext_read_extent+0x18d/0xa20 fs/hfs/extent.c:200 hfs_extend_file+0x4b5/0xae0 fs/hfs/extent.c:401 hfs_bmap_reserve+0x29f/0x380 fs/hfs/btree.c:234 hfs_cat_create+0x208/0xaa0 fs/hfs/catalog.c:104 hfs_create+0x6b/0xf0 fs/hfs/dir.c:202 lookup_open.isra.0+0x105a/0x1400 fs/namei.c:3492 open_last_lookups fs/namei.c:3560 [inline] path_openat+0x975/0x2750 fs/namei.c:3788 do_filp_open+0x1ba/0x410 fs/namei.c:3818 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_open fs/open.c:1380 [inline] __se_sys_open fs/open.c:1376 [inline] __x64_sys_open+0x11d/0x1c0 fs/open.c:1376 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 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:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 hfs_extend_file+0x97/0xae0 fs/hfs/extent.c:397 hfs_bmap_reserve+0x29f/0x380 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x3c1/0x510 fs/hfs/extent.c:121 __hfs_ext_cache_extent fs/hfs/extent.c:174 [inline] hfs_ext_read_extent+0x81c/0xa20 fs/hfs/extent.c:202 hfs_extend_file+0x4b5/0xae0 fs/hfs/extent.c:401 hfs_get_block+0x17f/0x820 fs/hfs/extent.c:353 __block_write_begin_int+0x3bd/0x14b0 fs/buffer.c:2064 __block_write_begin fs/buffer.c:2114 [inline] block_write_begin+0xb9/0x4d0 fs/buffer.c:2175 cont_write_begin+0x534/0x740 fs/buffer.c:2534 hfs_write_begin+0x87/0x150 fs/hfs/inode.c:58 generic_perform_write+0x256/0x570 mm/filemap.c:3929 __generic_file_write_iter+0x2ae/0x500 mm/filemap.c:4057 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4089 call_write_iter include/linux/fs.h:1868 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x945/0xd50 fs/read_write.c:584 ksys_write+0x12b/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 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/1); lock(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock/1); lock(&HFS_I(tree->inode)->extents_lock); *** DEADLOCK *** 5 locks held by syz-executor.5/8230: #0: ffff88807d656b68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe7/0x100 fs/file.c:1047 #1: ffff88802c1b6460 (sb_writers#20){.+.+}-{0:0}, at: ksys_write+0x12b/0x250 fs/read_write.c:637 #2: ffff88807dcaa3a8 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #2: ffff88807dcaa3a8 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: generic_file_write_iter+0x92/0x350 mm/filemap.c:4086 #3: ffff88807dcaa1f8 (&HFS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0x97/0xae0 fs/hfs/extent.c:397 #4: ffff88808377a0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x182/0x240 fs/hfs/bfind.c:33 stack backtrace: CPU: 1 PID: 8230 Comm: syz-executor.5 Not tainted 6.4.0-rc6-syzkaller-00279-g8c1f0c38b310 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 hfs_extend_file+0x97/0xae0 fs/hfs/extent.c:397 hfs_bmap_reserve+0x29f/0x380 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x3c1/0x510 fs/hfs/extent.c:121 __hfs_ext_cache_extent fs/hfs/extent.c:174 [inline] hfs_ext_read_extent+0x81c/0xa20 fs/hfs/extent.c:202 hfs_extend_file+0x4b5/0xae0 fs/hfs/extent.c:401 hfs_get_block+0x17f/0x820 fs/hfs/extent.c:353 __block_write_begin_int+0x3bd/0x14b0 fs/buffer.c:2064 __block_write_begin fs/buffer.c:2114 [inline] block_write_begin+0xb9/0x4d0 fs/buffer.c:2175 cont_write_begin+0x534/0x740 fs/buffer.c:2534 hfs_write_begin+0x87/0x150 fs/hfs/inode.c:58 generic_perform_write+0x256/0x570 mm/filemap.c:3929 __generic_file_write_iter+0x2ae/0x500 mm/filemap.c:4057 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4089 call_write_iter include/linux/fs.h:1868 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x945/0xd50 fs/read_write.c:584 ksys_write+0x12b/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fdac2a8c389 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:00007fdac3703168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fdac2babf80 RCX: 00007fdac2a8c389 RDX: 00000000001ff7ff RSI: 0000000020004200 RDI: 0000000000000004 RBP: 00007fdac2ad7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc1de05daf R14: 00007fdac3703300 R15: 0000000000022000