====================================================== WARNING: possible circular locking dependency detected 6.1.55-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/4719 is trying to acquire lock: ffff8880784008f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_free+0xb7/0x4d0 fs/hfsplus/bitmap.c:182 but task is already holding lock: ffff88808f800e88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x2d6/0xb40 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}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 hfsplus_get_block+0x37f/0x14e0 fs/hfsplus/extents.c:260 block_read_full_folio+0x403/0xf60 fs/buffer.c:2271 filemap_read_folio+0x199/0x780 mm/filemap.c:2407 do_read_cache_folio+0x2ee/0x810 mm/filemap.c:3535 do_read_cache_page+0x32/0x220 mm/filemap.c:3577 read_mapping_page include/linux/pagemap.h:756 [inline] hfsplus_block_allocate+0xea/0x8b0 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xa4c/0x1b10 fs/hfsplus/extents.c:468 hfsplus_get_block+0x402/0x14e0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x544/0x1a30 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x98/0x1f0 fs/buffer.c:2102 cont_write_begin+0x63f/0x880 fs/buffer.c:2456 hfsplus_write_begin+0x86/0xd0 fs/hfsplus/inode.c:52 cont_expand_zero fs/buffer.c:2416 [inline] cont_write_begin+0x6e1/0x880 fs/buffer.c:2446 hfsplus_write_begin+0x86/0xd0 fs/hfsplus/inode.c:52 generic_cont_expand_simple+0x187/0x2a0 fs/buffer.c:2347 hfsplus_setattr+0x169/0x280 fs/hfsplus/inode.c:263 notify_change+0xce3/0xfc0 fs/attr.c:499 do_truncate+0x21c/0x300 fs/open.c:65 do_sys_ftruncate+0x2e2/0x380 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&sbi->alloc_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3824 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5048 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 hfsplus_block_free+0xb7/0x4d0 fs/hfsplus/bitmap.c:182 hfsplus_free_extents+0x17a/0xae0 fs/hfsplus/extents.c:363 hfsplus_file_truncate+0x7cc/0xb40 fs/hfsplus/extents.c:591 hfsplus_setattr+0x1b9/0x280 fs/hfsplus/inode.c:269 notify_change+0xce3/0xfc0 fs/attr.c:499 do_truncate+0x21c/0x300 fs/open.c:65 vfs_truncate+0x2dd/0x3a0 fs/open.c:111 do_sys_truncate+0xda/0x190 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/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(&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.2/4719: #0: ffff88807a5fa460 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 #1: ffff88808f801080 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88808f801080 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: do_truncate+0x208/0x300 fs/open.c:63 #2: ffff88808f800e88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x2d6/0xb40 fs/hfsplus/extents.c:576 stack backtrace: CPU: 1 PID: 4719 Comm: syz-executor.2 Not tainted 6.1.55-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3824 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5048 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 hfsplus_block_free+0xb7/0x4d0 fs/hfsplus/bitmap.c:182 hfsplus_free_extents+0x17a/0xae0 fs/hfsplus/extents.c:363 hfsplus_file_truncate+0x7cc/0xb40 fs/hfsplus/extents.c:591 hfsplus_setattr+0x1b9/0x280 fs/hfsplus/inode.c:269 notify_change+0xce3/0xfc0 fs/attr.c:499 do_truncate+0x21c/0x300 fs/open.c:65 vfs_truncate+0x2dd/0x3a0 fs/open.c:111 do_sys_truncate+0xda/0x190 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f29d227cae9 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:00007f29d2f500c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f29d239bf80 RCX: 00007f29d227cae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00007f29d22c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f29d239bf80 R15: 00007ffeb9b41378