====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.166/7149 is trying to acquire lock: ffff0000f8961538 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_init_acl+0x258/0x5f0 fs/ocfs2/acl.c:366 but task is already holding lock: ffff0000c5b2a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe4c/0x10dc fs/jbd2/transaction.c:442 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (jbd2_handle){++++}-{0:0}: start_this_handle+0xe74/0x10dc fs/jbd2/transaction.c:444 jbd2__journal_start+0x288/0x51c fs/jbd2/transaction.c:501 jbd2_journal_start+0x3c/0x4c fs/jbd2/transaction.c:540 ocfs2_start_trans+0x368/0x6b0 fs/ocfs2/journal.c:374 ocfs2_shutdown_local_alloc+0x1ac/0x7e4 fs/ocfs2/localalloc.c:417 ocfs2_dismount_volume+0x1ec/0x8cc fs/ocfs2/super.c:1825 ocfs2_put_super+0xec/0x320 fs/ocfs2/super.c:1553 generic_shutdown_super+0x12c/0x2b8 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1766 deactivate_locked_super+0xc4/0x12c fs/super.c:474 deactivate_super+0xe0/0x100 fs/super.c:507 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1375 __cleanup_mnt+0x20/0x30 fs/namespace.c:1382 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x168 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #2 (&journal->j_trans_barrier){.+.+}-{4:4}: down_read+0x58/0x2f8 kernel/locking/rwsem.c:1537 ocfs2_start_trans+0x35c/0x6b0 fs/ocfs2/journal.c:372 ocfs2_shutdown_local_alloc+0x1ac/0x7e4 fs/ocfs2/localalloc.c:417 ocfs2_dismount_volume+0x1ec/0x8cc fs/ocfs2/super.c:1825 ocfs2_put_super+0xec/0x320 fs/ocfs2/super.c:1553 generic_shutdown_super+0x12c/0x2b8 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1766 deactivate_locked_super+0xc4/0x12c fs/super.c:474 deactivate_super+0xe0/0x100 fs/super.c:507 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1375 __cleanup_mnt+0x20/0x30 fs/namespace.c:1382 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x168 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #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.h:1799 [inline] sb_start_intwrite include/linux/fs.h:1982 [inline] ocfs2_start_trans+0x1f4/0x6b0 fs/ocfs2/journal.c:370 ocfs2_xattr_set+0xac4/0xe9c fs/ocfs2/xattr.c:3643 ocfs2_set_acl+0x574/0x628 fs/ocfs2/acl.c:254 ocfs2_acl_chmod+0x1c0/0x2f0 fs/ocfs2/acl.c:341 ocfs2_setattr+0xfc0/0x17a0 fs/ocfs2/file.c:1297 notify_change+0x9a4/0xc50 fs/attr.c:552 chmod_common+0x1f8/0x370 fs/open.c:650 do_fchmodat+0x114/0x224 fs/open.c:697 __do_sys_fchmodat fs/open.c:716 [inline] __se_sys_fchmodat fs/open.c:713 [inline] __arm64_sys_fchmodat+0x80/0x98 fs/open.c:713 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #0 (&oi->ip_xattr_sem){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 down_read+0x58/0x2f8 kernel/locking/rwsem.c:1537 ocfs2_init_acl+0x258/0x5f0 fs/ocfs2/acl.c:366 ocfs2_mknod+0x1028/0x1cf0 fs/ocfs2/namei.c:413 ocfs2_create+0x190/0x474 fs/ocfs2/namei.c:676 lookup_open fs/namei.c:3708 [inline] open_last_lookups fs/namei.c:3807 [inline] path_openat+0x12d8/0x2c40 fs/namei.c:4043 do_filp_open+0x18c/0x36c fs/namei.c:4073 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1461 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 other info that might help us debug this: Chain exists of: &oi->ip_xattr_sem --> &journal->j_trans_barrier --> jbd2_handle Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(jbd2_handle); lock(&journal->j_trans_barrier); lock(jbd2_handle); rlock(&oi->ip_xattr_sem); *** DEADLOCK *** 8 locks held by syz.3.166/7149: #0: ffff0000f948e428 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:557 #1: ffff0000f8961800 (&type->i_mutex_dir_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline] #1: ffff0000f8961800 (&type->i_mutex_dir_key#12){+.+.}-{4:4}, at: open_last_lookups fs/namei.c:3804 [inline] #1: ffff0000f8961800 (&type->i_mutex_dir_key#12){+.+.}-{4:4}, at: path_openat+0x638/0x2c40 fs/namei.c:4043 #2: ffff0000dda689c0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline] #2: ffff0000dda689c0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x12c/0x3b9c fs/ocfs2/suballoc.c:788 #3: ffff0000f89609c0 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline] #3: ffff0000f89609c0 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x12c/0x3b9c fs/ocfs2/suballoc.c:788 #4: ffff0000dda6a640 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline] #4: ffff0000dda6a640 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_local_alloc_bits+0x104/0x26a0 fs/ocfs2/localalloc.c:636 #5: ffff0000f948e618 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_mknod+0xc50/0x1cf0 fs/ocfs2/namei.c:364 #6: ffff0000cf48b8e8 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x35c/0x6b0 fs/ocfs2/journal.c:372 #7: ffff0000c5b2a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe4c/0x10dc fs/jbd2/transaction.c:442 stack backtrace: CPU: 1 UID: 0 PID: 7149 Comm: syz.3.166 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 down_read+0x58/0x2f8 kernel/locking/rwsem.c:1537 ocfs2_init_acl+0x258/0x5f0 fs/ocfs2/acl.c:366 ocfs2_mknod+0x1028/0x1cf0 fs/ocfs2/namei.c:413 ocfs2_create+0x190/0x474 fs/ocfs2/namei.c:676 lookup_open fs/namei.c:3708 [inline] open_last_lookups fs/namei.c:3807 [inline] path_openat+0x12d8/0x2c40 fs/namei.c:4043 do_filp_open+0x18c/0x36c fs/namei.c:4073 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1461 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596