loop0: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 6.5.0-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor208/14880 is trying to acquire lock: ffff8881194458f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff88811591a988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1d6/0x1b20 fs/hfsplus/extents.c:457 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+0x1e3/0x530 kernel/locking/lockdep.c:5761 __mutex_lock_common+0x1d8/0x2380 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799 hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260 block_read_full_folio+0x47f/0x1010 fs/buffer.c:2412 filemap_read_folio+0xf5/0x670 mm/filemap.c:2389 do_read_cache_folio+0x134/0x830 mm/filemap.c:3696 do_read_cache_page+0x32/0x220 mm/filemap.c:3762 read_mapping_page include/linux/pagemap.h:776 [inline] hfsplus_block_allocate+0xee/0x8c0 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xa50/0x1b20 fs/hfsplus/extents.c:468 hfsplus_get_block+0x406/0x14f0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x556/0x1a70 fs/buffer.c:2128 __block_write_begin fs/buffer.c:2178 [inline] block_write_begin+0x9c/0x1f0 fs/buffer.c:2239 cont_write_begin+0x644/0x890 fs/buffer.c:2597 hfsplus_write_begin+0x8a/0xd0 fs/hfsplus/inode.c:52 cont_expand_zero fs/buffer.c:2557 [inline] cont_write_begin+0x6ed/0x890 fs/buffer.c:2587 hfsplus_write_begin+0x8a/0xd0 fs/hfsplus/inode.c:52 generic_cont_expand_simple+0x18f/0x2b0 fs/buffer.c:2488 hfsplus_setattr+0x16d/0x290 fs/hfsplus/inode.c:263 notify_change+0xc8f/0xf40 fs/attr.c:483 do_truncate+0x220/0x310 fs/open.c:66 do_sys_ftruncate+0x2f7/0x390 fs/open.c:194 do_syscall_64+0x46/0xc0 entry_SYSCALL_64_after_hwframe+0x6f/0xd9 -> #0 (&sbi->alloc_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain+0x18a8/0x5850 kernel/locking/lockdep.c:3876 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5144 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5761 __mutex_lock_common+0x1d8/0x2380 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799 hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xa50/0x1b20 fs/hfsplus/extents.c:468 hfsplus_get_block+0x406/0x14f0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x556/0x1a70 fs/buffer.c:2128 __block_write_begin fs/buffer.c:2178 [inline] block_write_begin+0x9c/0x1f0 fs/buffer.c:2239 cont_write_begin+0x644/0x890 fs/buffer.c:2597 hfsplus_write_begin+0x8a/0xd0 fs/hfsplus/inode.c:52 cont_expand_zero fs/buffer.c:2524 [inline] cont_write_begin+0x319/0x890 fs/buffer.c:2587 hfsplus_write_begin+0x8a/0xd0 fs/hfsplus/inode.c:52 generic_perform_write+0x321/0x640 mm/filemap.c:3923 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4044 do_iter_readv_writev+0x333/0x4b0 do_iter_write+0x1f5/0x910 fs/read_write.c:860 vfs_writev fs/read_write.c:933 [inline] do_pwritev+0x21a/0x360 fs/read_write.c:1030 do_syscall_64+0x46/0xc0 entry_SYSCALL_64_after_hwframe+0x6f/0xd9 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-executor208/14880: #0: ffff88817761e400 (sb_writers#14){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:932 [inline] #0: ffff88817761e400 (sb_writers#14){.+.+}-{0:0}, at: do_pwritev+0x1fe/0x360 fs/read_write.c:1030 #1: ffff88811591ab80 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline] #1: ffff88811591ab80 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: generic_file_write_iter+0x83/0x310 mm/filemap.c:4041 #2: ffff88811591a988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1d6/0x1b20 fs/hfsplus/extents.c:457 stack backtrace: CPU: 1 PID: 14880 Comm: syz-executor208 Not tainted 6.5.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2195 check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain+0x18a8/0x5850 kernel/locking/lockdep.c:3876 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5144 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5761 __mutex_lock_common+0x1d8/0x2380 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799 hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xa50/0x1b20 fs/hfsplus/extents.c:468 hfsplus_get_block+0x406/0x14f0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x556/0x1a70 fs/buffer.c:2128 __block_write_begin fs/buffer.c:2178 [inline] block_write_begin+0x9c/0x1f0 fs/buffer.c:2239 cont_write_begin+0x644/0x890 fs/buffer.c:2597 hfsplus_write_begin+0x8a/0xd0 fs/hfsplus/inode.c:52 cont_expand_zero fs/buffer.c:2524 [inline] cont_write_begin+0x319/0x890 fs/buffer.c:2587 hfsplus_write_begin+0x8a/0xd0 fs/hfsplus/inode.c:52 generic_perform_write+0x321/0x640 mm/filemap.c:3923 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4044 do_iter_readv_writev+0x333/0x4b0 do_iter_write+0x1f5/0x910 fs/read_write.c:860 vfs_writev fs/read_write.c:933 [inline] do_pwritev+0x21a/0x360 fs/read_write.c:1030 do_syscall_64+0x46/0xc0 entry_SYSCALL_64_after_hwframe+0x6f/0xd9 RIP: 0033:0x7fec92af8299 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 1f 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:00007ffd524dde88 EFLAGS: 00000212 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fec92af8299 RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000007fff R11: 0000000000000212 R12: 00007ffd524ddec8 R13: 0000000000000576 R14: 00007ffd524ddf00 R15: 431bde82d7b634db