====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.1265/9269 is trying to acquire lock: ffff88807cdf5488 (&osb->system_file_mutex){+.+.}-{3:3}, at: ocfs2_get_system_file_inode+0x1a2/0x820 fs/ocfs2/sysfile.c:101 but task is already holding lock: ffff88805539cda0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_write_begin+0x194/0x310 fs/ocfs2/aops.c:1904 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ocfs2_read_virt_blocks+0x266/0x980 fs/ocfs2/extent_map.c:984 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x3a8/0x2080 fs/ocfs2/dir.c:1091 ocfs2_find_files_on_disk+0x102/0x390 fs/ocfs2/dir.c:1995 ocfs2_lookup_ino_from_name+0x4f/0xf0 fs/ocfs2/dir.c:2017 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x34d/0x820 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x315/0x6e0 fs/ocfs2/super.c:457 ocfs2_initialize_super fs/ocfs2/super.c:2253 [inline] ocfs2_fill_super+0x2b5a/0x5020 fs/ocfs2/super.c:994 mount_bdev+0x28a/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&osb->system_file_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747 ocfs2_get_system_file_inode+0x1a2/0x820 fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0xfd/0x2770 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b6/0xc10 fs/ocfs2/suballoc.c:1184 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1245 [inline] ocfs2_lock_allocators+0x2ce/0x5f0 fs/ocfs2/suballoc.c:2701 ocfs2_write_begin_nolock+0x1bdd/0x4590 fs/ocfs2/aops.c:1742 ocfs2_write_begin+0x1b7/0x310 fs/ocfs2/aops.c:1906 generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862 __generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960 ocfs2_file_write_iter+0x1731/0x1fc0 fs/ocfs2/file.c:2469 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x638/0xb10 fs/read_write.c:861 iter_file_splice_write+0x6be/0xcf0 fs/splice.c:685 do_splice_from fs/splice.c:763 [inline] direct_splice_actor+0xe1/0x130 fs/splice.c:950 splice_direct_to_actor+0x4b8/0xbd0 fs/splice.c:896 do_splice_direct+0x1ce/0x2f0 fs/splice.c:1002 do_sendfile+0x51b/0xe20 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64+0x141/0x1a0 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_file_ip_alloc_sem_key); lock(&osb->system_file_mutex); lock(&ocfs2_file_ip_alloc_sem_key); lock(&osb->system_file_mutex); *** DEADLOCK *** 3 locks held by syz.3.1265/9269: #0: ffff888079c78460 (sb_writers#23){.+.+}-{0:0}, at: do_sendfile+0x4f6/0xe20 fs/read_write.c:1254 #1: ffff88805539d108 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88805539d108 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: ocfs2_file_write_iter+0x45a/0x1fc0 fs/ocfs2/file.c:2399 #2: ffff88805539cda0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_write_begin+0x194/0x310 fs/ocfs2/aops.c:1904 stack backtrace: CPU: 1 PID: 9269 Comm: syz.3.1265 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747 ocfs2_get_system_file_inode+0x1a2/0x820 fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0xfd/0x2770 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b6/0xc10 fs/ocfs2/suballoc.c:1184 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1245 [inline] ocfs2_lock_allocators+0x2ce/0x5f0 fs/ocfs2/suballoc.c:2701 ocfs2_write_begin_nolock+0x1bdd/0x4590 fs/ocfs2/aops.c:1742 ocfs2_write_begin+0x1b7/0x310 fs/ocfs2/aops.c:1906 generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862 __generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960 ocfs2_file_write_iter+0x1731/0x1fc0 fs/ocfs2/file.c:2469 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x638/0xb10 fs/read_write.c:861 iter_file_splice_write+0x6be/0xcf0 fs/splice.c:685 do_splice_from fs/splice.c:763 [inline] direct_splice_actor+0xe1/0x130 fs/splice.c:950 splice_direct_to_actor+0x4b8/0xbd0 fs/splice.c:896 do_splice_direct+0x1ce/0x2f0 fs/splice.c:1002 do_sendfile+0x51b/0xe20 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64+0x141/0x1a0 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f745a79de99 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:00007f74589f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f745aa25fa0 RCX: 00007f745a79de99 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005 RBP: 00007f745a833eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f745aa26038 R14: 00007f745aa25fa0 R15: 00007ffe61c47c18