====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.38/4522 is trying to acquire lock: ffff888072619488 (&osb->system_file_mutex){+.+.}-{3:3}, at: ocfs2_get_system_file_inode+0x1b2/0x850 fs/ocfs2/sysfile.c:101 but task is already holding lock: ffff8880594a94a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_dio_wr_get_block+0x904/0x1820 fs/ocfs2/aops.c:2225 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+0x25d/0x970 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+0x3c1/0x2180 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+0x36a/0x850 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x2f3/0x6d0 fs/ocfs2/super.c:457 ocfs2_initialize_super fs/ocfs2/super.c:2253 [inline] ocfs2_fill_super+0x2bc2/0x5090 fs/ocfs2/super.c:994 mount_bdev+0x287/0x3c0 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+0x24a/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:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 ocfs2_get_system_file_inode+0x1b2/0x850 fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0xfd/0x2700 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b6/0xc10 fs/ocfs2/suballoc.c:1162 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline] ocfs2_lock_allocators+0x2d5/0x5f0 fs/ocfs2/suballoc.c:2679 ocfs2_write_begin_nolock+0x1b70/0x44f0 fs/ocfs2/aops.c:1740 ocfs2_dio_wr_get_block+0xbb6/0x1820 fs/ocfs2/aops.c:2239 get_more_blocks fs/direct-io.c:659 [inline] do_direct_IO fs/direct-io.c:947 [inline] __blockdev_direct_IO+0x1749/0x3570 fs/direct-io.c:1260 ocfs2_direct_IO+0x233/0x2a0 fs/ocfs2/aops.c:2468 generic_file_direct_write+0x10f/0x330 mm/filemap.c:3787 __generic_file_write_iter+0x15f/0x2a0 mm/filemap.c:3945 ocfs2_file_write_iter+0x1660/0x1f00 fs/ocfs2/file.c:2469 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x642/0xb10 fs/read_write.c:861 iter_file_splice_write+0x699/0xcc0 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+0x48b/0xb90 fs/splice.c:896 do_splice_direct+0x1ce/0x2f0 fs/splice.c:1002 do_sendfile+0x5f3/0xea0 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.0.38/4522: #0: ffff88807df14460 (sb_writers#13){.+.+}-{0:0}, at: do_sendfile+0x5d0/0xea0 fs/read_write.c:1254 #1: ffff8880594a9808 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff8880594a9808 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: ocfs2_file_write_iter+0x448/0x1f00 fs/ocfs2/file.c:2399 #2: ffff8880594a94a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_dio_wr_get_block+0x904/0x1820 fs/ocfs2/aops.c:2225 stack backtrace: CPU: 0 PID: 4522 Comm: syz.0.38 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 ocfs2_get_system_file_inode+0x1b2/0x850 fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0xfd/0x2700 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b6/0xc10 fs/ocfs2/suballoc.c:1162 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline] ocfs2_lock_allocators+0x2d5/0x5f0 fs/ocfs2/suballoc.c:2679 ocfs2_write_begin_nolock+0x1b70/0x44f0 fs/ocfs2/aops.c:1740 ocfs2_dio_wr_get_block+0xbb6/0x1820 fs/ocfs2/aops.c:2239 get_more_blocks fs/direct-io.c:659 [inline] do_direct_IO fs/direct-io.c:947 [inline] __blockdev_direct_IO+0x1749/0x3570 fs/direct-io.c:1260 ocfs2_direct_IO+0x233/0x2a0 fs/ocfs2/aops.c:2468 generic_file_direct_write+0x10f/0x330 mm/filemap.c:3787 __generic_file_write_iter+0x15f/0x2a0 mm/filemap.c:3945 ocfs2_file_write_iter+0x1660/0x1f00 fs/ocfs2/file.c:2469 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x642/0xb10 fs/read_write.c:861 iter_file_splice_write+0x699/0xcc0 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+0x48b/0xb90 fs/splice.c:896 do_splice_direct+0x1ce/0x2f0 fs/splice.c:1002 do_sendfile+0x5f3/0xea0 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: 0033:0x7f2011b9bf79 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:00007fff945c9788 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f2011e15fa0 RCX: 00007f2011b9bf79 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f2011c327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2011e15fac R14: 00007f2011e15fa0 R15: 00007f2011e15fa0 (syz.0.38,4522,0):ocfs2_dio_end_io:2428 ERROR: Direct IO failed, bytes = -5