(syz.7.418,11145,1):ocfs2_fill_super:1177 ERROR: status = -22 loop7: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.7.418/11145 is trying to acquire lock: ffff8880637cb8e8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa9/0xd30 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff888026022978 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21c/0x1df0 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){+.+.}-{4:4}: __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:580 hfsplus_get_block+0x391/0x1610 fs/hfsplus/extents.c:264 block_read_full_folio+0x29f/0x810 fs/buffer.c:2308 filemap_read_folio+0x12c/0x3a0 mm/filemap.c:2520 do_read_cache_folio+0x2bf/0x560 mm/filemap.c:4156 do_read_cache_page mm/filemap.c:4222 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4231 read_mapping_page include/linux/pagemap.h:1009 [inline] hfsplus_block_allocate+0xf7/0xd30 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xb77/0x1df0 fs/hfsplus/extents.c:468 hfsplus_get_block+0x41f/0x1610 fs/hfsplus/extents.c:249 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2030 block_write_begin fs/buffer.c:2144 [inline] cont_write_begin+0x71b/0xac0 fs/buffer.c:2506 hfsplus_write_begin+0x126/0x1e0 fs/hfsplus/inode.c:56 generic_perform_write+0x2ad/0x8b0 mm/filemap.c:4374 generic_file_write_iter+0xaf/0x330 mm/filemap.c:4517 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61e/0xbb0 fs/read_write.c:687 ksys_write+0x156/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->alloc_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:580 hfsplus_block_allocate+0xa9/0xd30 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xb77/0x1df0 fs/hfsplus/extents.c:468 hfsplus_get_block+0x41f/0x1610 fs/hfsplus/extents.c:249 get_more_blocks fs/direct-io.c:644 [inline] do_direct_IO fs/direct-io.c:932 [inline] __blockdev_direct_IO+0x1965/0x33d0 fs/direct-io.c:1236 blockdev_direct_IO include/linux/fs.h:3155 [inline] hfsplus_direct_IO+0x220/0x370 fs/hfsplus/inode.c:174 generic_file_direct_write+0x1d1/0x3f0 mm/filemap.c:4308 __generic_file_write_iter+0x120/0x240 mm/filemap.c:4477 generic_file_write_iter+0xaf/0x330 mm/filemap.c:4517 iter_file_splice_write+0xa36/0x1240 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x104/0x160 fs/splice.c:1159 splice_direct_to_actor+0x586/0xcc0 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x19b/0x2a0 fs/splice.c:1228 do_sendfile+0x540/0x7e0 fs/read_write.c:1371 __do_sys_sendfile64 fs/read_write.c:1432 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1418 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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 *** locks held by syz.7.418/11145: 3, last CPU#1: #0: ffff88805aba4510 (sb_writers#26){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1158 #1: ffff888026022b48 (&sb->s_type->i_mutex_key#38){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #1: ffff888026022b48 (&sb->s_type->i_mutex_key#38){+.+.}-{4:4}, at: generic_file_write_iter+0x83/0x330 mm/filemap.c:4514 #2: ffff888026022978 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21c/0x1df0 fs/hfsplus/extents.c:457 stack backtrace: CPU: 1 UID: 0 PID: 11145 Comm: syz.7.418 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219 check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:580 hfsplus_block_allocate+0xa9/0xd30 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xb77/0x1df0 fs/hfsplus/extents.c:468 hfsplus_get_block+0x41f/0x1610 fs/hfsplus/extents.c:249 get_more_blocks fs/direct-io.c:644 [inline] do_direct_IO fs/direct-io.c:932 [inline] __blockdev_direct_IO+0x1965/0x33d0 fs/direct-io.c:1236 blockdev_direct_IO include/linux/fs.h:3155 [inline] hfsplus_direct_IO+0x220/0x370 fs/hfsplus/inode.c:174 generic_file_direct_write+0x1d1/0x3f0 mm/filemap.c:4308 __generic_file_write_iter+0x120/0x240 mm/filemap.c:4477 generic_file_write_iter+0xaf/0x330 mm/filemap.c:4517 iter_file_splice_write+0xa36/0x1240 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x104/0x160 fs/splice.c:1159 splice_direct_to_actor+0x586/0xcc0 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x19b/0x2a0 fs/splice.c:1228 do_sendfile+0x540/0x7e0 fs/read_write.c:1371 __do_sys_sendfile64 fs/read_write.c:1432 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1418 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5548cce159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5546f26028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5548f55fa0 RCX: 00007f5548cce159 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007 RBP: 00007f5548d6503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5548f56038 R14: 00007f5548f55fa0 R15: 00007ffc77d36b48