====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.678/9308 is trying to acquire lock: ffff8880593e6a20 (&ocfs2_quota_ip_alloc_sem_key ){++++}-{3:3} , at: ocfs2_try_remove_refcount_tree+0xb7/0x320 fs/ocfs2/refcounttree.c:932 but task is already holding lock: ffff8880593e6ab8 (&oi->ip_xattr_sem ){++++}-{3:3}, at: ocfs2_try_remove_refcount_tree+0xa5/0x320 fs/ocfs2/refcounttree.c:931 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 ( &oi->ip_xattr_sem){++++}-{3:3} : down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 ocfs2_init_acl+0x2fa/0x720 fs/ocfs2/acl.c:366 ocfs2_mknod+0x12e5/0x20f0 fs/ocfs2/namei.c:410 vfs_mknod+0x32b/0x360 fs/namei.c:3991 do_mknodat+0x37e/0x4f0 fs/namei.c:-1 __do_sys_mknod fs/namei.c:4074 [inline] __se_sys_mknod fs/namei.c:4072 [inline] __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4072 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 ( jbd2_handle){++++}-{0:0} : start_this_handle+0x1e9d/0x20c0 fs/jbd2/transaction.c:448 jbd2__journal_start+0x2bb/0x5b0 fs/jbd2/transaction.c:505 jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:544 ocfs2_start_trans+0x376/0x6c0 fs/ocfs2/journal.c:374 ocfs2_modify_bh+0xe9/0x470 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x13fd/0x1770 fs/ocfs2/quota_local.c:764 dquot_load_quota_sb+0x757/0xb80 fs/quota/dquot.c:2468 dquot_load_quota_inode+0x2dc/0x5d0 fs/quota/dquot.c:2505 ocfs2_enable_quotas+0x1c7/0x440 fs/ocfs2/super.c:926 ocfs2_fill_super+0x3f6d/0x4d90 fs/ocfs2/super.c:1141 mount_bdev+0x22b/0x2d0 fs/super.c:1643 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3377 do_mount fs/namespace.c:3717 [inline] __do_sys_mount fs/namespace.c:3926 [inline] __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3903 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #2 ( &journal->j_trans_barrier){.+.+}-{3:3} : down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x36a/0x6c0 fs/ocfs2/journal.c:372 ocfs2_modify_bh+0xe9/0x470 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x13fd/0x1770 fs/ocfs2/quota_local.c:764 dquot_load_quota_sb+0x757/0xb80 fs/quota/dquot.c:2468 dquot_load_quota_inode+0x2dc/0x5d0 fs/quota/dquot.c:2505 ocfs2_enable_quotas+0x1c7/0x440 fs/ocfs2/super.c:926 ocfs2_fill_super+0x3f6d/0x4d90 fs/ocfs2/super.c:1141 mount_bdev+0x22b/0x2d0 fs/super.c:1643 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3377 do_mount fs/namespace.c:3717 [inline] __do_sys_mount fs/namespace.c:3926 [inline] __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3903 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (sb_internal#2){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1633 [inline] sb_start_intwrite include/linux/fs.h:1755 [inline] ocfs2_start_trans+0x26b/0x6c0 fs/ocfs2/journal.c:370 ocfs2_acquire_dquot+0x67b/0xaf0 fs/ocfs2/quota_global.c:848 dqget+0x77c/0xeb0 fs/quota/dquot.c:988 __dquot_initialize+0x3ba/0xcb0 fs/quota/dquot.c:1516 ocfs2_get_init_inode+0x13c/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x867/0x20f0 fs/ocfs2/namei.c:310 vfs_mknod+0x32b/0x360 fs/namei.c:3991 do_mknodat+0x37e/0x4f0 fs/namei.c:-1 __do_sys_mknod fs/namei.c:4074 [inline] __se_sys_mknod fs/namei.c:4072 [inline] __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4072 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 ocfs2_try_remove_refcount_tree+0xb7/0x320 fs/ocfs2/refcounttree.c:932 ocfs2_truncate_file+0xd84/0x13a0 fs/ocfs2/file.c:521 ocfs2_setattr+0x150d/0x1b20 fs/ocfs2/file.c:1211 notify_change+0xb0d/0xe10 fs/attr.c:499 do_truncate+0x19b/0x220 fs/open.c:66 vfs_truncate+0x266/0x300 fs/open.c:112 do_sys_truncate+0xe0/0x1a0 fs/open.c:135 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &ocfs2_quota_ip_alloc_sem_key --> jbd2_handle --> &oi->ip_xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&oi->ip_xattr_sem); lock(jbd2_handle); lock(&oi->ip_xattr_sem); lock(&ocfs2_quota_ip_alloc_sem_key); *** DEADLOCK *** 3 locks held by syz.5.678/9308: #0: ffff888023910418 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:403 #1: ffff8880593e6d98 (&sb->s_type->i_mutex_key#24){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff8880593e6d98 (&sb->s_type->i_mutex_key#24){+.+.}-{3:3}, at: do_truncate+0x187/0x220 fs/open.c:64 #2: ffff8880593e6ab8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_try_remove_refcount_tree+0xa5/0x320 fs/ocfs2/refcounttree.c:931 stack backtrace: CPU: 0 PID: 9308 Comm: syz.5.678 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 ocfs2_try_remove_refcount_tree+0xb7/0x320 fs/ocfs2/refcounttree.c:932 ocfs2_truncate_file+0xd84/0x13a0 fs/ocfs2/file.c:521 ocfs2_setattr+0x150d/0x1b20 fs/ocfs2/file.c:1211 notify_change+0xb0d/0xe10 fs/attr.c:499 do_truncate+0x19b/0x220 fs/open.c:66 vfs_truncate+0x266/0x300 fs/open.c:112 do_sys_truncate+0xe0/0x1a0 fs/open.c:135 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fc3d738eba9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc3d82c2038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007fc3d75d6090 RCX: 00007fc3d738eba9 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000200000000000 RBP: 00007fc3d7411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc3d75d6128 R14: 00007fc3d75d6090 R15: 00007fff1971b768