====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.151/5019 is trying to acquire lock: ffff0000e23a94a0 (&oi->ip_alloc_sem){+.+.}-{3:3}, at: ocfs2_try_remove_refcount_tree+0xb4/0x2e4 fs/ocfs2/refcounttree.c:932 but task is already holding lock: ffff0000e23a9538 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_try_remove_refcount_tree+0xa8/0x2e4 fs/ocfs2/refcounttree.c:931 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&oi->ip_xattr_sem){++++}-{3:3}: down_read+0x64/0x300 kernel/locking/rwsem.c:1520 ocfs2_init_acl+0x264/0x61c fs/ocfs2/acl.c:365 ocfs2_mknod+0x129c/0x2110 fs/ocfs2/namei.c:410 ocfs2_create+0x19c/0x4f8 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3490 [inline] open_last_lookups fs/namei.c:3558 [inline] path_openat+0xe18/0x26bc fs/namei.c:3788 do_filp_open+0x194/0x384 fs/namei.c:3818 file_open_name fs/open.c:1265 [inline] filp_open+0x160/0x1cc fs/open.c:1285 do_coredump+0x1570/0x1c68 fs/coredump.c:765 get_signal+0xdec/0x1304 kernel/signal.c:2857 do_signal arch/arm64/kernel/signal.c:1095 [inline] do_notify_resume+0x28c/0x2aa4 arch/arm64/kernel/signal.c:1148 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_da+0xb4/0x144 arch/arm64/kernel/entry-common.c:516 el0t_64_sync_handler+0x90/0xf0 arch/arm64/kernel/entry-common.c:658 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #2 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x64/0x300 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x374/0x6cc fs/ocfs2/journal.c:374 ocfs2_modify_bh+0xd8/0x44c fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x107c/0x1378 fs/ocfs2/quota_local.c:764 dquot_load_quota_sb+0x6c4/0xa24 fs/quota/dquot.c:2470 dquot_load_quota_inode+0x274/0x4e4 fs/quota/dquot.c:2507 ocfs2_enable_quotas+0x17c/0x3c0 fs/ocfs2/super.c:926 ocfs2_fill_super+0x34ec/0x436c fs/ocfs2/super.c:1139 mount_bdev+0x264/0x358 fs/super.c:1443 ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1186 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #1 (sb_internal#5){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1891 [inline] sb_start_intwrite include/linux/fs.h:2013 [inline] ocfs2_start_trans+0x20c/0x6cc fs/ocfs2/journal.c:372 ocfs2_orphan_for_truncate fs/ocfs2/file.c:392 [inline] ocfs2_truncate_file+0x60c/0x14f8 fs/ocfs2/file.c:496 ocfs2_setattr+0x1288/0x1930 fs/ocfs2/file.c:1212 notify_change+0xb0c/0xdcc fs/attr.c:499 do_truncate+0x188/0x20c fs/open.c:65 do_coredump+0x196c/0x1c68 fs/coredump.c:801 get_signal+0xdec/0x1304 kernel/signal.c:2857 do_signal arch/arm64/kernel/signal.c:1095 [inline] do_notify_resume+0x28c/0x2aa4 arch/arm64/kernel/signal.c:1148 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_da+0xb4/0x144 arch/arm64/kernel/entry-common.c:516 el0t_64_sync_handler+0x90/0xf0 arch/arm64/kernel/entry-common.c:658 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&oi->ip_alloc_sem){+.+.}-{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+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ocfs2_try_remove_refcount_tree+0xb4/0x2e4 fs/ocfs2/refcounttree.c:932 ocfs2_truncate_file+0xd24/0x14f8 fs/ocfs2/file.c:517 ocfs2_setattr+0x1288/0x1930 fs/ocfs2/file.c:1212 notify_change+0xb0c/0xdcc fs/attr.c:499 do_truncate+0x188/0x20c fs/open.c:65 do_coredump+0x196c/0x1c68 fs/coredump.c:801 get_signal+0xdec/0x1304 kernel/signal.c:2857 do_signal arch/arm64/kernel/signal.c:1095 [inline] do_notify_resume+0x28c/0x2aa4 arch/arm64/kernel/signal.c:1148 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_da+0xb4/0x144 arch/arm64/kernel/entry-common.c:516 el0t_64_sync_handler+0x90/0xf0 arch/arm64/kernel/entry-common.c:658 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Chain exists of: &oi->ip_alloc_sem --> &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(&oi->ip_alloc_sem); *** DEADLOCK *** 2 locks held by syz.4.151/5019: #0: ffff0000e23a9808 (&sb->s_type->i_mutex_key#29){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff0000e23a9808 (&sb->s_type->i_mutex_key#29){+.+.}-{3:3}, at: do_truncate+0x174/0x20c fs/open.c:63 #1: ffff0000e23a9538 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_try_remove_refcount_tree+0xa8/0x2e4 fs/ocfs2/refcounttree.c:931 stack backtrace: CPU: 1 PID: 5019 Comm: syz.4.151 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x264/0x2f8 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+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ocfs2_try_remove_refcount_tree+0xb4/0x2e4 fs/ocfs2/refcounttree.c:932 ocfs2_truncate_file+0xd24/0x14f8 fs/ocfs2/file.c:517 ocfs2_setattr+0x1288/0x1930 fs/ocfs2/file.c:1212 notify_change+0xb0c/0xdcc fs/attr.c:499 do_truncate+0x188/0x20c fs/open.c:65 do_coredump+0x196c/0x1c68 fs/coredump.c:801 get_signal+0xdec/0x1304 kernel/signal.c:2857 do_signal arch/arm64/kernel/signal.c:1095 [inline] do_notify_resume+0x28c/0x2aa4 arch/arm64/kernel/signal.c:1148 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_da+0xb4/0x144 arch/arm64/kernel/entry-common.c:516 el0t_64_sync_handler+0x90/0xf0 arch/arm64/kernel/entry-common.c:658 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 ocfs2: Unmounting device (7,4) on (node local)