====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.2206/9665 is trying to acquire lock: ffff88805f0f3f60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_reflink+0x4cb/0x920 fs/ocfs2/refcounttree.c:4304 but task is already holding lock: ffff88805f0f3ff8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_reflink+0x4bc/0x920 fs/ocfs2/refcounttree.c:4303 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&oi->ip_xattr_sem){++++}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_init_acl+0x307/0x770 fs/ocfs2/acl.c:365 ocfs2_mknod+0x15de/0x2510 fs/ocfs2/namei.c:410 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 vfs_create+0x2db/0x460 fs/namei.c:3170 do_mknodat+0x49e/0x630 fs/namei.c:4002 __do_sys_mknod fs/namei.c:4035 [inline] __se_sys_mknod fs/namei.c:4033 [inline] __x64_sys_mknod+0x8a/0xa0 fs/namei.c:4033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #4 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 ocfs2_shutdown_local_alloc+0x1f3/0xac0 fs/ocfs2/localalloc.c:416 ocfs2_dismount_volume+0x1e1/0x890 fs/ocfs2/super.c:1885 generic_shutdown_super+0x130/0x300 fs/super.c:475 kill_block_super+0x7c/0xe0 fs/super.c:1427 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x426/0x4d0 fs/namespace.c:1148 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #3 (sb_internal#2){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1811 [inline] sb_start_intwrite include/linux/fs.h:1928 [inline] ocfs2_start_trans+0x2a7/0x6f0 fs/ocfs2/journal.c:372 ocfs2_shutdown_local_alloc+0x1f3/0xac0 fs/ocfs2/localalloc.c:416 ocfs2_dismount_volume+0x1e1/0x890 fs/ocfs2/super.c:1885 generic_shutdown_super+0x130/0x300 fs/super.c:475 kill_block_super+0x7c/0xe0 fs/super.c:1427 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x426/0x4d0 fs/namespace.c:1148 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #2 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}: down_write+0x38/0x60 kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:787 [inline] ocfs2_reserve_suballoc_bits+0x16d/0x44b0 fs/ocfs2/suballoc.c:804 ocfs2_reserve_cluster_bitmap_bits fs/ocfs2/suballoc.c:1150 [inline] ocfs2_reserve_clusters_with_limit+0x3b9/0xc10 fs/ocfs2/suballoc.c:1195 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:692 [inline] ocfs2_reserve_suballoc_bits+0x781/0x44b0 fs/ocfs2/suballoc.c:850 ocfs2_reserve_new_metadata_blocks+0x412/0x9a0 fs/ocfs2/suballoc.c:1000 ocfs2_expand_inline_dir fs/ocfs2/dir.c:2838 [inline] ocfs2_extend_dir+0xd4a/0x4b90 fs/ocfs2/dir.c:3200 ocfs2_prepare_dir_for_insert+0x2efd/0x52b0 fs/ocfs2/dir.c:4321 ocfs2_mknod+0x876/0x2510 fs/ocfs2/namei.c:294 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 vfs_create+0x2db/0x460 fs/namei.c:3170 do_mknodat+0x49e/0x630 fs/namei.c:4002 __do_sys_mknod fs/namei.c:4035 [inline] __se_sys_mknod fs/namei.c:4033 [inline] __x64_sys_mknod+0x8a/0xa0 fs/namei.c:4033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}: down_write+0x38/0x60 kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:787 [inline] ocfs2_reserve_suballoc_bits+0x16d/0x44b0 fs/ocfs2/suballoc.c:804 ocfs2_reserve_new_metadata_blocks+0x412/0x9a0 fs/ocfs2/suballoc.c:1000 ocfs2_expand_inline_dir fs/ocfs2/dir.c:2838 [inline] ocfs2_extend_dir+0xd4a/0x4b90 fs/ocfs2/dir.c:3200 ocfs2_prepare_dir_for_insert+0x2efd/0x52b0 fs/ocfs2/dir.c:4321 ocfs2_mknod+0x876/0x2510 fs/ocfs2/namei.c:294 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 vfs_create+0x2db/0x460 fs/namei.c:3170 do_mknodat+0x49e/0x630 fs/namei.c:4002 __do_sys_mknod fs/namei.c:4035 [inline] __se_sys_mknod fs/namei.c:4033 [inline] __x64_sys_mknod+0x8a/0xa0 fs/namei.c:4033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ocfs2_reflink+0x4cb/0x920 fs/ocfs2/refcounttree.c:4304 ocfs2_vfs_reflink+0x333/0x450 fs/ocfs2/refcounttree.c:4431 ocfs2_reflink_ioctl+0x39c/0x440 fs/ocfs2/refcounttree.c:4471 ocfs2_ioctl+0x586/0x7a0 fs/ocfs2/ioctl.c:913 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &ocfs2_file_ip_alloc_sem_key --> &journal->j_trans_barrier --> &oi->ip_xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&oi->ip_xattr_sem); lock(&journal->j_trans_barrier); lock(&oi->ip_xattr_sem); lock(&ocfs2_file_ip_alloc_sem_key); *** DEADLOCK *** 4 locks held by syz.4.2206/9665: #0: ffff8880767d0460 (sb_writers#19){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:386 #1: ffff88805f0db488 (&type->i_mutex_dir_key#24/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline] #1: ffff88805f0db488 (&type->i_mutex_dir_key#24/1){+.+.}-{3:3}, at: filename_create+0x20b/0x450 fs/namei.c:3843 #2: ffff88805f0f42c8 (&sb->s_type->i_mutex_key#43){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #2: ffff88805f0f42c8 (&sb->s_type->i_mutex_key#43){+.+.}-{3:3}, at: ocfs2_vfs_reflink+0x2f3/0x450 fs/ocfs2/refcounttree.c:4428 #3: ffff88805f0f3ff8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_reflink+0x4bc/0x920 fs/ocfs2/refcounttree.c:4303 stack backtrace: CPU: 0 PID: 9665 Comm: syz.4.2206 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ocfs2_reflink+0x4cb/0x920 fs/ocfs2/refcounttree.c:4304 ocfs2_vfs_reflink+0x333/0x450 fs/ocfs2/refcounttree.c:4431 ocfs2_reflink_ioctl+0x39c/0x440 fs/ocfs2/refcounttree.c:4471 ocfs2_ioctl+0x586/0x7a0 fs/ocfs2/ioctl.c:913 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f75ee5a0019 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:00007f75ec7f8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f75ee827fa0 RCX: 00007f75ee5a0019 RDX: 0000200000000180 RSI: 0000000040186f04 RDI: 0000000000000004 RBP: 00007f75ee63700c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f75ee828038 R14: 00007f75ee827fa0 R15: 00007ffecc687a48