loop5: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.705/6899 is trying to acquire lock: ffff888023b33708 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1ca/0x1a40 fs/hfsplus/extents.c:455 but task is already holding lock: ffff888062b7c0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x150/0x1c0 fs/hfsplus/bfind.c:28 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+0x12d/0xae0 kernel/locking/mutex.c:747 hfsplus_find_init+0x150/0x1c0 fs/hfsplus/bfind.c:28 hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline] hfsplus_file_extend+0x465/0x1a40 fs/hfsplus/extents.c:459 hfsplus_get_block+0x41d/0x1520 fs/hfsplus/extents.c:245 __block_write_begin_int+0x577/0x1ab0 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x96/0x1e0 fs/buffer.c:2102 cont_write_begin+0x5f9/0x800 fs/buffer.c:2456 hfsplus_write_begin+0x87/0xd0 fs/hfsplus/inode.c:52 cont_expand_zero fs/buffer.c:2383 [inline] cont_write_begin+0x2c5/0x800 fs/buffer.c:2446 hfsplus_write_begin+0x87/0xd0 fs/hfsplus/inode.c:52 generic_cont_expand_simple+0x13d/0x200 fs/buffer.c:2347 hfsplus_setattr+0x15b/0x270 fs/hfsplus/inode.c:283 notify_change+0xca0/0xf90 fs/attr.c:499 do_truncate+0x1ac/0x240 fs/open.c:65 vfs_truncate+0x262/0x2f0 fs/open.c:111 do_sys_truncate+0xf2/0x1c0 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747 hfsplus_file_extend+0x1ca/0x1a40 fs/hfsplus/extents.c:455 hfsplus_bmap_reserve+0x107/0x510 fs/hfsplus/btree.c:358 __hfsplus_ext_write_extent+0x264/0x520 fs/hfsplus/extents.c:104 __hfsplus_ext_cache_extent+0x81/0xbd0 fs/hfsplus/extents.c:186 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline] hfsplus_file_extend+0x4b9/0x1a40 fs/hfsplus/extents.c:459 hfsplus_get_block+0x41d/0x1520 fs/hfsplus/extents.c:245 __block_write_begin_int+0x577/0x1ab0 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x96/0x1e0 fs/buffer.c:2102 cont_write_begin+0x5f9/0x800 fs/buffer.c:2456 hfsplus_write_begin+0x87/0xd0 fs/hfsplus/inode.c:52 generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862 __generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2271 [inline] aio_write+0x545/0x780 fs/aio.c:1615 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x6ea/0x1340 fs/aio.c:2034 __do_sys_io_submit fs/aio.c:2093 [inline] __se_sys_io_submit+0x19d/0x310 fs/aio.c:2063 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&tree->tree_lock/1); lock(&HFSPLUS_I(inode)->extents_lock); lock(&tree->tree_lock/1); lock(&HFSPLUS_I(inode)->extents_lock); *** DEADLOCK *** 3 locks held by syz.5.705/6899: #0: ffff888023b35400 (&sb->s_type->i_mutex_key#29){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline] #0: ffff888023b35400 (&sb->s_type->i_mutex_key#29){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x2e0 mm/filemap.c:3986 #1: ffff888023b35208 (&hip->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1ca/0x1a40 fs/hfsplus/extents.c:455 #2: ffff888062b7c0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x150/0x1c0 fs/hfsplus/bfind.c:28 stack backtrace: CPU: 1 PID: 6899 Comm: syz.5.705 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747 hfsplus_file_extend+0x1ca/0x1a40 fs/hfsplus/extents.c:455 hfsplus_bmap_reserve+0x107/0x510 fs/hfsplus/btree.c:358 __hfsplus_ext_write_extent+0x264/0x520 fs/hfsplus/extents.c:104 __hfsplus_ext_cache_extent+0x81/0xbd0 fs/hfsplus/extents.c:186 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline] hfsplus_file_extend+0x4b9/0x1a40 fs/hfsplus/extents.c:459 hfsplus_get_block+0x41d/0x1520 fs/hfsplus/extents.c:245 __block_write_begin_int+0x577/0x1ab0 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x96/0x1e0 fs/buffer.c:2102 cont_write_begin+0x5f9/0x800 fs/buffer.c:2456 hfsplus_write_begin+0x87/0xd0 fs/hfsplus/inode.c:52 generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862 __generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2271 [inline] aio_write+0x545/0x780 fs/aio.c:1615 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x6ea/0x1340 fs/aio.c:2034 __do_sys_io_submit fs/aio.c:2093 [inline] __se_sys_io_submit+0x19d/0x310 fs/aio.c:2063 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2207d9e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2208c48028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007f2208025fa0 RCX: 00007f2207d9e159 RDX: 0000200000000540 RSI: 000000000000003b RDI: 00007f2208c1f000 RBP: 00007f2207e35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2208026038 R14: 00007f2208025fa0 R15: 00007ffe038f6ab8