====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.1007/12039 is trying to acquire lock: ffff88805097cda0 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa7/0x2f0 fs/ocfs2/refcounttree.c:933 but task is already holding lock: ffff88805097ce38 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0x9f/0x2f0 fs/ocfs2/refcounttree.c:932 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+0x99/0x460 kernel/locking/rwsem.c:1537 ocfs2_init_acl+0x35b/0x840 fs/ocfs2/acl.c:367 ocfs2_mknod+0x1772/0x27d0 fs/ocfs2/namei.c:414 ocfs2_mkdir+0xf2/0x460 fs/ocfs2/namei.c:660 vfs_mkdir+0x361/0x850 fs/namei.c:5233 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5266 __do_sys_mkdirat fs/namei.c:5287 [inline] __se_sys_mkdirat fs/namei.c:5284 [inline] __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5284 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&journal->j_trans_barrier){.+.+}-{4:4}: down_read+0x99/0x460 kernel/locking/rwsem.c:1537 ocfs2_start_trans+0x5c8/0x920 fs/ocfs2/journal.c:372 ocfs2_modify_bh+0xbe/0x440 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0xd5c/0x1640 fs/ocfs2/quota_local.c:767 dquot_load_quota_sb+0x7c1/0x11d0 fs/quota/dquot.c:2462 dquot_load_quota_inode fs/quota/dquot.c:2499 [inline] dquot_load_quota_inode+0x2a3/0x470 fs/quota/dquot.c:2491 ocfs2_enable_quotas+0x28a/0x5a0 fs/ocfs2/super.c:930 ocfs2_fill_super.cold+0x1cd/0x3ac fs/ocfs2/super.c:1140 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694 vfs_get_tree+0x92/0x320 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3760 [inline] do_new_mount fs/namespace.c:3836 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4146 do_mount fs/namespace.c:4159 [inline] __do_sys_mount fs/namespace.c:4348 [inline] __se_sys_mount fs/namespace.c:4325 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4325 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (sb_internal#4){.+.+}-{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+0x4b7/0x920 fs/ocfs2/journal.c:370 ocfs2_setattr+0x10c3/0x26a0 fs/ocfs2/file.c:1270 notify_change+0xb25/0x1330 fs/attr.c:556 do_truncate+0x1df/0x240 fs/open.c:68 vfs_truncate+0x538/0x720 fs/open.c:118 do_sys_truncate+0xee/0x190 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x54/0x80 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&oi->ip_alloc_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+0x14b8/0x2630 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590 ocfs2_try_remove_refcount_tree+0xa7/0x2f0 fs/ocfs2/refcounttree.c:933 ocfs2_truncate_file+0xbab/0x1840 fs/ocfs2/file.c:522 ocfs2_setattr+0x14cb/0x26a0 fs/ocfs2/file.c:1219 notify_change+0xb25/0x1330 fs/attr.c:556 do_truncate+0x1df/0x240 fs/open.c:68 vfs_truncate+0x538/0x720 fs/open.c:118 do_sys_truncate+0xee/0x190 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x54/0x80 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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 *** 3 locks held by syz.0.1007/12039: #0: ffff8880207ba420 (sb_writers#22){.+.+}-{0:0}, at: vfs_truncate+0x336/0x720 fs/open.c:96 #1: ffff88805097d100 (&sb->s_type->i_mutex_key#45){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1033 [inline] #1: ffff88805097d100 (&sb->s_type->i_mutex_key#45){+.+.}-{4:4}, at: do_truncate+0x14e/0x240 fs/open.c:63 #2: ffff88805097ce38 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0x9f/0x2f0 fs/ocfs2/refcounttree.c:932 stack backtrace: CPU: 1 UID: 0 PID: 12039 Comm: syz.0.1007 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043 check_noncircular+0x146/0x160 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+0x14b8/0x2630 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590 ocfs2_try_remove_refcount_tree+0xa7/0x2f0 fs/ocfs2/refcounttree.c:933 ocfs2_truncate_file+0xbab/0x1840 fs/ocfs2/file.c:522 ocfs2_setattr+0x14cb/0x26a0 fs/ocfs2/file.c:1219 notify_change+0xb25/0x1330 fs/attr.c:556 do_truncate+0x1df/0x240 fs/open.c:68 vfs_truncate+0x538/0x720 fs/open.c:118 do_sys_truncate+0xee/0x190 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x54/0x80 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f877939bf79 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:00007f877a1c3028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f8779615fa0 RCX: 00007f877939bf79 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000200000000900 RBP: 00007f87794327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8779616038 R14: 00007f8779615fa0 R15: 00007ffe0076db68