loop5: detected capacity change from 0 to 64 ====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc6-syzkaller-00046-gde4664485abb #0 Not tainted ------------------------------------------------------ syz-executor.5/16846 is trying to acquire lock: ffff88807bf06278 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xff/0x1440 fs/hfs/extent.c:397 but task is already holding lock: ffff888076da00b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x16e/0x1f0 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&tree->tree_lock#2/1){+.+.}-{3:3}: lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 hfs_find_init+0x16e/0x1f0 hfs_ext_read_extent fs/hfs/extent.c:200 [inline] hfs_extend_file+0x31b/0x1440 fs/hfs/extent.c:401 hfs_bmap_reserve+0xd9/0x3f0 fs/hfs/btree.c:234 hfs_cat_create+0x1eb/0xa70 fs/hfs/catalog.c:104 hfs_create+0x66/0xd0 fs/hfs/dir.c:202 lookup_open fs/namei.c:3416 [inline] open_last_lookups fs/namei.c:3484 [inline] path_openat+0x13df/0x3170 fs/namei.c:3712 do_filp_open+0x234/0x490 fs/namei.c:3742 do_sys_openat2+0x13f/0x500 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1375 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 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:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 hfs_extend_file+0xff/0x1440 fs/hfs/extent.c:397 hfs_bmap_reserve+0xd9/0x3f0 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+0x344/0x1440 fs/hfs/extent.c:401 hfs_get_block+0x3e4/0xb60 fs/hfs/extent.c:353 __block_write_begin_int+0x548/0x1a50 fs/buffer.c:2034 __block_write_begin fs/buffer.c:2084 [inline] block_write_begin+0x9c/0x1f0 fs/buffer.c:2145 cont_write_begin+0x643/0x880 fs/buffer.c:2504 hfs_write_begin+0x8a/0xd0 fs/hfs/inode.c:58 cont_expand_zero fs/buffer.c:2431 [inline] cont_write_begin+0x316/0x880 fs/buffer.c:2494 hfs_write_begin+0x8a/0xd0 fs/hfs/inode.c:58 hfs_file_truncate+0x1ed/0xa20 fs/hfs/extent.c:494 hfs_inode_setattr+0x461/0x6a0 fs/hfs/inode.c:656 notify_change+0xc8b/0xf40 fs/attr.c:482 do_truncate+0x220/0x300 fs/open.c:66 do_sys_ftruncate+0x2e4/0x380 fs/open.c:194 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 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#2/1); lock(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock#2/1); lock(&HFS_I(tree->inode)->extents_lock); *** DEADLOCK *** 4 locks held by syz-executor.5/16846: #0: ffff888022428460 (sb_writers#23){.+.+}-{0:0}, at: do_sys_ftruncate+0x24c/0x380 fs/open.c:191 #1: ffff888037850928 (&sb->s_type->i_mutex_key#30){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888037850928 (&sb->s_type->i_mutex_key#30){+.+.}-{3:3}, at: do_truncate+0x20c/0x300 fs/open.c:64 #2: ffff888037850778 (&HFS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xff/0x1440 fs/hfs/extent.c:397 #3: ffff888076da00b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x16e/0x1f0 stack backtrace: CPU: 1 PID: 16846 Comm: syz-executor.5 Not tainted 6.3.0-rc6-syzkaller-00046-gde4664485abb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2fe/0x3b0 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 hfs_extend_file+0xff/0x1440 fs/hfs/extent.c:397 hfs_bmap_reserve+0xd9/0x3f0 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+0x344/0x1440 fs/hfs/extent.c:401 hfs_get_block+0x3e4/0xb60 fs/hfs/extent.c:353 __block_write_begin_int+0x548/0x1a50 fs/buffer.c:2034 __block_write_begin fs/buffer.c:2084 [inline] block_write_begin+0x9c/0x1f0 fs/buffer.c:2145 cont_write_begin+0x643/0x880 fs/buffer.c:2504 hfs_write_begin+0x8a/0xd0 fs/hfs/inode.c:58 cont_expand_zero fs/buffer.c:2431 [inline] cont_write_begin+0x316/0x880 fs/buffer.c:2494 hfs_write_begin+0x8a/0xd0 fs/hfs/inode.c:58 hfs_file_truncate+0x1ed/0xa20 fs/hfs/extent.c:494 hfs_inode_setattr+0x461/0x6a0 fs/hfs/inode.c:656 notify_change+0xc8b/0xf40 fs/attr.c:482 do_truncate+0x220/0x300 fs/open.c:66 do_sys_ftruncate+0x2e4/0x380 fs/open.c:194 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fdb2108c169 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:00007fdb21e8f168 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 00007fdb211abf80 RCX: 00007fdb2108c169 RDX: 0000000000000000 RSI: 0000000002007ffb RDI: 0000000000000005 RBP: 00007fdb210e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd2e902aaf R14: 00007fdb21e8f300 R15: 0000000000022000