====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.9.575/15925 is trying to acquire lock: ffff88805f9e3a10 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x360 fs/ocfs2/refcounttree.c:959 but task is already holding lock: ffff88805f9e3a98 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x360 fs/ocfs2/refcounttree.c:958 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&oi->ip_xattr_sem){++++}-{4:4}: down_read+0x97/0x200 kernel/locking/rwsem.c:1574 ocfs2_xattr_get+0xf4/0x260 fs/ocfs2/xattr.c:1578 __vfs_getxattr+0x412/0x440 fs/xattr.c:446 smk_fetch+0xb4/0x140 security/smack/smack_lsm.c:298 smack_d_instantiate+0x757/0x990 security/smack/smack_lsm.c:3679 security_d_instantiate+0x106/0x1d0 security/security.c:3703 d_instantiate+0x54/0xb0 fs/dcache.c:2176 ocfs2_mknod+0x1acb/0x22b0 fs/ocfs2/namei.c:459 ocfs2_mkdir+0x180/0x430 fs/ocfs2/namei.c:667 vfs_mkdir+0x408/0x620 fs/namei.c:5410 filename_mkdirat+0x289/0x520 fs/namei.c:5443 __do_sys_mkdirat fs/namei.c:5464 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461 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 -> #2 (&journal->j_trans_barrier){.+.+}-{4:4}: down_read+0x97/0x200 kernel/locking/rwsem.c:1574 ocfs2_start_trans+0x3af/0x700 fs/ocfs2/journal.c:369 ocfs2_shutdown_local_alloc+0x1ef/0xa50 fs/ocfs2/localalloc.c:417 ocfs2_dismount_volume+0x1e2/0x820 fs/ocfs2/super.c:1824 generic_shutdown_super+0x13d/0x2d0 fs/super.c:755 kill_block_super+0x44/0xa0 fs/super.c:1904 deactivate_locked_super+0xbc/0x110 fs/super.c:589 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (sb_internal#3){.+.+}-{0:0}: percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs/super.h:19 [inline] sb_start_intwrite include/linux/fs/super.h:177 [inline] ocfs2_start_trans+0x2ac/0x700 fs/ocfs2/journal.c:367 ocfs2_setattr+0x9eb/0x1d10 fs/ocfs2/file.c:1275 notify_change+0xbb8/0xec0 fs/attr.c:556 chmod_common+0x262/0x480 fs/open.c:686 do_fchmodat+0x12d/0x230 fs/open.c:731 __do_sys_chmod fs/open.c:755 [inline] __se_sys_chmod fs/open.c:753 [inline] __x64_sys_chmod+0x62/0x70 fs/open.c:753 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 (&ocfs2_file_ip_alloc_sem_key){++++}-{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 down_write+0x3a/0x50 kernel/locking/rwsem.c:1631 ocfs2_try_remove_refcount_tree+0xb6/0x360 fs/ocfs2/refcounttree.c:959 ocfs2_truncate_file+0xe91/0x14b0 fs/ocfs2/file.c:527 ocfs2_setattr+0x1641/0x1d10 fs/ocfs2/file.c:1224 notify_change+0xbb8/0xec0 fs/attr.c:556 do_truncate+0x1c2/0x250 fs/open.c:68 handle_truncate fs/namei.c:4300 [inline] do_open fs/namei.c:4841 [inline] path_openat+0x15ba/0x1d60 fs/namei.c:5000 do_file_open+0x23e/0x4a0 fs/namei.c:5029 do_sys_openat2+0x115/0x200 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1434 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: 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 *** locks held by syz.9.575/15925: 3, last CPU#1: #0: ffff88803f044510 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494 #1: ffff88805f9e3dc0 (&sb->s_type->i_mutex_key#43){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff88805f9e3dc0 (&sb->s_type->i_mutex_key#43){+.+.}-{4:4}, at: do_truncate+0x18f/0x250 fs/open.c:63 #2: ffff88805f9e3a98 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x360 fs/ocfs2/refcounttree.c:958 stack backtrace: CPU: 1 UID: 0 PID: 15925 Comm: syz.9.575 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 down_write+0x3a/0x50 kernel/locking/rwsem.c:1631 ocfs2_try_remove_refcount_tree+0xb6/0x360 fs/ocfs2/refcounttree.c:959 ocfs2_truncate_file+0xe91/0x14b0 fs/ocfs2/file.c:527 ocfs2_setattr+0x1641/0x1d10 fs/ocfs2/file.c:1224 notify_change+0xbb8/0xec0 fs/attr.c:556 do_truncate+0x1c2/0x250 fs/open.c:68 handle_truncate fs/namei.c:4300 [inline] do_open fs/namei.c:4841 [inline] path_openat+0x15ba/0x1d60 fs/namei.c:5000 do_file_open+0x23e/0x4a0 fs/namei.c:5029 do_sys_openat2+0x115/0x200 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1434 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: 0033:0x7f5af1e0e159 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:00007f5af0045028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f5af2096090 RCX: 00007f5af1e0e159 RDX: 000000000000275a RSI: 0000200000000080 RDI: ffffffffffffff9c RBP: 00007f5af1ea506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5af2096128 R14: 00007f5af2096090 R15: 00007ffff76076a8