====================================================== WARNING: possible circular locking dependency detected 6.7.0-rc8-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/10605 is trying to acquire lock: ffff88801b24e0f8 ( &sbi->alloc_mutex){+.+.}-{3:3} , at: hfsplus_block_free+0xd2/0x530 fs/hfsplus/bitmap.c:182 but task is already holding lock: ffff888027d31588 (&HFSPLUS_I(inode)->extents_lock ){+.+.}-{3:3} , at: hfsplus_file_truncate+0x204/0x9d0 fs/hfsplus/extents.c:576 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3} : __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:747 hfsplus_get_block+0x277/0x9e0 fs/hfsplus/extents.c:260 block_read_full_folio+0x3df/0xaa0 fs/buffer.c:2399 filemap_read_folio+0xe9/0x2c0 mm/filemap.c:2323 do_read_cache_folio+0x205/0x540 mm/filemap.c:3700 do_read_cache_page mm/filemap.c:3766 [inline] read_cache_page+0x5b/0x160 mm/filemap.c:3775 read_mapping_page include/linux/pagemap.h:871 [inline] hfsplus_block_allocate+0x144/0x990 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0x440/0x1090 fs/hfsplus/extents.c:468 hfsplus_get_block+0x1ae/0x9e0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x3c0/0x1560 fs/buffer.c:2119 __block_write_begin fs/buffer.c:2168 [inline] block_write_begin+0xb1/0x490 fs/buffer.c:2227 cont_write_begin+0x530/0x730 fs/buffer.c:2582 hfsplus_write_begin+0x87/0x140 fs/hfsplus/inode.c:52 cont_expand_zero fs/buffer.c:2509 [inline] cont_write_begin+0x336/0x730 fs/buffer.c:2572 hfsplus_write_begin+0x87/0x140 fs/hfsplus/inode.c:52 generic_cont_expand_simple+0x11f/0x200 fs/buffer.c:2473 hfsplus_setattr+0x193/0x310 fs/hfsplus/inode.c:263 notify_change+0x742/0x11c0 fs/attr.c:499 do_truncate+0x15c/0x220 fs/open.c:66 do_sys_ftruncate+0x6a2/0x790 fs/open.c:194 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #0 (&sbi->alloc_mutex ){+.+.}-{3:3} : check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2433/0x3b20 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:747 hfsplus_block_free+0xd2/0x530 fs/hfsplus/bitmap.c:182 hfsplus_free_extents+0x3a2/0x520 fs/hfsplus/extents.c:363 hfsplus_file_truncate+0x832/0x9d0 fs/hfsplus/extents.c:591 hfsplus_setattr+0x1eb/0x310 fs/hfsplus/inode.c:269 notify_change+0x742/0x11c0 fs/attr.c:499 do_truncate+0x15c/0x220 fs/open.c:66 handle_truncate fs/namei.c:3280 [inline] do_open fs/namei.c:3626 [inline] path_openat+0x2597/0x2c50 fs/namei.c:3779 do_filp_open+0x1de/0x430 fs/namei.c:3809 do_sys_openat2+0x176/0x1e0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_creat fs/open.c:1528 [inline] __se_sys_creat fs/open.c:1522 [inline] __x64_sys_creat+0xcd/0x120 fs/open.c:1522 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); *** DEADLOCK *** 3 locks held by syz-executor.2/10605: #0: ffff88812599a418 (sb_writers#20){.+.+}-{0:0}, at: do_open fs/namei.c:3615 [inline] #0: ffff88812599a418 (sb_writers#20){.+.+}-{0:0}, at: path_openat+0x2112/0x2c50 fs/namei.c:3779 #1: ffff888027d31780 (&sb->s_type->i_mutex_key#29){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff888027d31780 (&sb->s_type->i_mutex_key#29){+.+.}-{3:3}, at: do_truncate+0x14b/0x220 fs/open.c:64 #2: ffff888027d31588 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x204/0x9d0 fs/hfsplus/extents.c:576 stack backtrace: CPU: 3 PID: 10605 Comm: syz-executor.2 Not tainted 6.7.0-rc8-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x317/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2433/0x3b20 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:747 hfsplus_block_free+0xd2/0x530 fs/hfsplus/bitmap.c:182 hfsplus_free_extents+0x3a2/0x520 fs/hfsplus/extents.c:363 hfsplus_file_truncate+0x832/0x9d0 fs/hfsplus/extents.c:591 hfsplus_setattr+0x1eb/0x310 fs/hfsplus/inode.c:269 notify_change+0x742/0x11c0 fs/attr.c:499 do_truncate+0x15c/0x220 fs/open.c:66 handle_truncate fs/namei.c:3280 [inline] do_open fs/namei.c:3626 [inline] path_openat+0x2597/0x2c50 fs/namei.c:3779 do_filp_open+0x1de/0x430 fs/namei.c:3809 do_sys_openat2+0x176/0x1e0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_creat fs/open.c:1528 [inline] __se_sys_creat fs/open.c:1522 [inline] __x64_sys_creat+0xcd/0x120 fs/open.c:1522 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f2cc907cce9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2cc9e5d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f2cc919bf80 RCX: 00007f2cc907cce9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100 RBP: 00007f2cc90c947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000004d R14: 00007f2cc919bf80 R15: 00007fff3de723a8