====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.7.2592/12808 is trying to acquire lock: ffff888034ac6648 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1ca/0x12b0 fs/hfsplus/extents.c:453 but task is already holding lock: ffff888056e860b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x186/0x2d0 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){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760 hfsplus_find_init+0x186/0x2d0 fs/hfsplus/bfind.c:28 hfsplus_ext_read_extent+0x18e/0x250 fs/hfsplus/extents.c:216 hfsplus_get_block+0x2b2/0xaa0 fs/hfsplus/extents.c:268 __block_write_begin_int+0x4f4/0x16d0 fs/buffer.c:2145 block_write_begin+0x9a/0x1d0 fs/buffer.c:2256 cont_write_begin+0x61a/0x950 fs/buffer.c:2594 hfsplus_write_begin+0x64/0x120 fs/hfsplus/inode.c:48 generic_cont_expand_simple+0x122/0x200 fs/buffer.c:2485 hfsplus_setattr+0x250/0x320 fs/hfsplus/inode.c:260 notify_change+0x6d2/0x12a0 fs/attr.c:546 do_truncate+0x1d7/0x230 fs/open.c:68 vfs_truncate+0x5d6/0x6e0 fs/open.c:118 do_sys_truncate fs/open.c:141 [inline] __do_sys_truncate fs/open.c:153 [inline] __se_sys_truncate fs/open.c:151 [inline] __x64_sys_truncate+0x172/0x1e0 fs/open.c:151 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760 hfsplus_file_extend+0x1ca/0x12b0 fs/hfsplus/extents.c:453 hfsplus_bmap_reserve+0x31f/0x420 fs/hfsplus/btree.c:358 __hfsplus_ext_write_extent+0x474/0x5e0 fs/hfsplus/extents.c:104 __hfsplus_ext_cache_extent+0x98/0x9d0 fs/hfsplus/extents.c:186 hfsplus_file_truncate+0x44d/0xcb0 fs/hfsplus/extents.c:596 hfsplus_setattr+0x19f/0x320 fs/hfsplus/inode.c:266 notify_change+0x6d2/0x12a0 fs/attr.c:546 do_truncate+0x1d7/0x230 fs/open.c:68 vfs_truncate+0x5d6/0x6e0 fs/open.c:118 do_sys_truncate fs/open.c:141 [inline] __do_sys_truncate fs/open.c:153 [inline] __se_sys_truncate fs/open.c:151 [inline] __x64_sys_truncate+0x172/0x1e0 fs/open.c:151 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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 *** 4 locks held by syz.7.2592/12808: #0: ffff88801bfcc420 (sb_writers#13){.+.+}-{0:0}, at: vfs_truncate+0x336/0x6e0 fs/open.c:96 #1: ffff888078e74d38 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:985 [inline] #1: ffff888078e74d38 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: do_truncate+0x146/0x230 fs/open.c:63 #2: ffff888078e74b48 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x211/0xcb0 fs/hfsplus/extents.c:573 #3: ffff888056e860b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x186/0x2d0 fs/hfsplus/bfind.c:28 stack backtrace: CPU: 1 UID: 0 PID: 12808 Comm: syz.7.2592 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760 hfsplus_file_extend+0x1ca/0x12b0 fs/hfsplus/extents.c:453 hfsplus_bmap_reserve+0x31f/0x420 fs/hfsplus/btree.c:358 __hfsplus_ext_write_extent+0x474/0x5e0 fs/hfsplus/extents.c:104 __hfsplus_ext_cache_extent+0x98/0x9d0 fs/hfsplus/extents.c:186 hfsplus_file_truncate+0x44d/0xcb0 fs/hfsplus/extents.c:596 hfsplus_setattr+0x19f/0x320 fs/hfsplus/inode.c:266 notify_change+0x6d2/0x12a0 fs/attr.c:546 do_truncate+0x1d7/0x230 fs/open.c:68 vfs_truncate+0x5d6/0x6e0 fs/open.c:118 do_sys_truncate fs/open.c:141 [inline] __do_sys_truncate fs/open.c:153 [inline] __se_sys_truncate fs/open.c:151 [inline] __x64_sys_truncate+0x172/0x1e0 fs/open.c:151 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe842d8efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe843cb1038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007fe842fe5fa0 RCX: 00007fe842d8efc9 RDX: 0000000000000000 RSI: 000000000000fbb0 RDI: 0000200000000000 RBP: 00007fe842e11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe842fe6038 R14: 00007fe842fe5fa0 R15: 00007fff1a7a50a8