loop0: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 6.1.38-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/18889 is trying to acquire lock: ffff888078c080f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x9a/0x8b0 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff888030e387c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1d2/0x1b10 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+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d4/0x2520 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 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 get_more_blocks fs/direct-io.c:665 [inline] do_direct_IO fs/direct-io.c:953 [inline] __blockdev_direct_IO+0x1ba3/0x4340 fs/direct-io.c:1266 blockdev_direct_IO include/linux/fs.h:3228 [inline] hfsplus_direct_IO+0xf6/0x1e0 fs/hfsplus/inode.c:135 generic_file_direct_write+0x204/0x460 mm/filemap.c:3678 __generic_file_write_iter+0x1c4/0x400 mm/filemap.c:3838 generic_file_write_iter+0xab/0x310 mm/filemap.c:3914 call_write_iter include/linux/fs.h:2205 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7ae/0xba0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 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:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d4/0x2520 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 hfsplus_block_allocate+0x9a/0x8b0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xa4c/0x1b10 fs/hfsplus/extents.c:468 hfsplus_bmap_reserve+0x101/0x4e0 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x1a9/0x1ba0 fs/hfsplus/catalog.c:272 hfsplus_mknod+0x166/0x2a0 fs/hfsplus/dir.c:494 lookup_open fs/namei.c:3413 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x12f1/0x2e60 fs/namei.c:3711 do_filp_open+0x230/0x480 fs/namei.c:3741 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_open fs/open.c:1342 [inline] __se_sys_open fs/open.c:1338 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1338 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 *** 5 locks held by syz-executor.0/18889: #0: ffff888018b04460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 #1: ffff888030e3a4c0 (&type->i_mutex_dir_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888030e3a4c0 (&type->i_mutex_dir_key#13){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3478 [inline] #1: ffff888030e3a4c0 (&type->i_mutex_dir_key#13){+.+.}-{3:3}, at: path_openat+0x7b6/0x2e60 fs/namei.c:3711 #2: ffff888078c08198 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_mknod+0x7a/0x2a0 fs/hfsplus/dir.c:486 #3: ffff8880762c60b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x146/0x1c0 #4: ffff888030e387c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1d2/0x1b10 fs/hfsplus/extents.c:457 stack backtrace: CPU: 1 PID: 18889 Comm: syz-executor.0 Not tainted 6.1.38-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 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:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d4/0x2520 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 hfsplus_block_allocate+0x9a/0x8b0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xa4c/0x1b10 fs/hfsplus/extents.c:468 hfsplus_bmap_reserve+0x101/0x4e0 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x1a9/0x1ba0 fs/hfsplus/catalog.c:272 hfsplus_mknod+0x166/0x2a0 fs/hfsplus/dir.c:494 lookup_open fs/namei.c:3413 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x12f1/0x2e60 fs/namei.c:3711 do_filp_open+0x230/0x480 fs/namei.c:3741 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_open fs/open.c:1342 [inline] __se_sys_open fs/open.c:1338 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1338 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: 0033:0x7f48fe47cb29 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:00007f48ff1b90c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f48fe59bf80 RCX: 00007f48fe47cb29 RDX: 0000000000000000 RSI: 0000000000143042 RDI: 0000000020002000 RBP: 00007f48fe4c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f48fe59bf80 R15: 00007fff9435dce8