======================================================= EXT4-fs (loop1): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /103/file0 supports timestamps until 2038-01-19 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.1.147-syzkaller #0 Not tainted ------------------------------------------------------ syz.1.552/6677 is trying to acquire lock: ffff88804e5de0a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x5a/0x410 fs/quota/dquot.c:507 but task is already holding lock: ffff888068bfc700 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ffff888068bfc700 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x171/0x12b0 fs/ext4/xattr.c:2328 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&ei->xattr_sem){++++}-{3:3}: down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ext4_setattr+0x92a/0x19f0 fs/ext4/inode.c:5501 notify_change+0xc74/0xf40 fs/attr.c:499 chown_common+0x486/0x620 fs/open.c:736 do_fchownat+0x164/0x270 fs/open.c:767 __do_sys_chown fs/open.c:787 [inline] __se_sys_chown fs/open.c:785 [inline] __x64_sys_chown+0x7e/0x90 fs/open.c:785 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #4 (jbd2_handle){++++}-{0:0}: start_this_handle+0x1f49/0x2150 fs/jbd2/transaction.c:463 jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:520 jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:559 ocfs2_start_trans+0x372/0x6c0 fs/ocfs2/journal.c:376 ocfs2_modify_bh+0xe5/0x460 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x13b1/0x16e0 fs/ocfs2/quota_local.c:764 dquot_load_quota_sb+0x756/0xac0 fs/quota/dquot.c:2470 dquot_load_quota_inode+0x2d8/0x5d0 fs/quota/dquot.c:2507 ocfs2_enable_quotas+0x1c3/0x440 fs/ocfs2/super.c:926 ocfs2_fill_super+0x409f/0x4d00 fs/ocfs2/super.c:1139 mount_bdev+0x287/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3063 do_mount fs/namespace.c:3406 [inline] __do_sys_mount fs/namespace.c:3614 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3591 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x366/0x6c0 fs/ocfs2/journal.c:374 ocfs2_modify_bh+0xe5/0x460 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x13b1/0x16e0 fs/ocfs2/quota_local.c:764 dquot_load_quota_sb+0x756/0xac0 fs/quota/dquot.c:2470 dquot_load_quota_inode+0x2d8/0x5d0 fs/quota/dquot.c:2507 ocfs2_enable_quotas+0x1c3/0x440 fs/ocfs2/super.c:926 ocfs2_fill_super+0x409f/0x4d00 fs/ocfs2/super.c:1139 mount_bdev+0x287/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3063 do_mount fs/namespace.c:3406 [inline] __do_sys_mount fs/namespace.c:3614 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3591 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #2 (sb_internal#2){.+.+}-{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+0x267/0x6c0 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x66e/0xb10 fs/ocfs2/quota_global.c:848 dqget+0x778/0xeb0 fs/quota/dquot.c:988 dquot_set_dqblk+0x27/0xf90 fs/quota/dquot.c:2833 quota_setquota+0x4ac/0x530 fs/quota/quota.c:310 __do_sys_quotactl fs/quota/quota.c:960 [inline] __se_sys_quotactl+0x295/0x6b0 fs/quota/quota.c:916 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ocfs2_create_local_dquot+0x1a0/0x1790 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x7ae/0xb10 fs/ocfs2/quota_global.c:871 dqget+0x778/0xeb0 fs/quota/dquot.c:988 dquot_set_dqblk+0x27/0xf90 fs/quota/dquot.c:2833 quota_setquota+0x4ac/0x530 fs/quota/quota.c:310 __do_sys_quotactl fs/quota/quota.c:960 [inline] __se_sys_quotactl+0x295/0x6b0 fs/quota/quota.c:916 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&dquot->dq_lock){+.+.}-{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+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 dquot_commit+0x5a/0x410 fs/quota/dquot.c:507 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6790 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412 dquot_alloc_inode+0x765/0xa20 fs/quota/dquot.c:1801 ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:883 [inline] ext4_xattr_inode_lookup_create+0xc0/0x1d10 fs/ext4/xattr.c:1542 ext4_xattr_block_set+0x23a/0x32a0 fs/ext4/xattr.c:1876 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2413 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2515 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x168/0x2f0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x2b2/0x2d0 fs/xattr.c:617 path_setxattr+0x142/0x280 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:648 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &dquot->dq_lock --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); lock(&dquot->dq_lock); *** DEADLOCK *** 4 locks held by syz.1.552/6677: #0: ffff88805aacc460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff888068bfca38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888068bfca38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x141/0x2f0 fs/xattr.c:308 #2: ffff888068bfc700 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff888068bfc700 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x171/0x12b0 fs/ext4/xattr.c:2328 #3: ffffffff8cc73088 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #3: ffffffff8cc73088 (dquot_srcu){....}-{0:0}, at: srcu_read_lock include/linux/srcu.h:165 [inline] #3: ffffffff8cc73088 (dquot_srcu){....}-{0:0}, at: dquot_alloc_inode+0x14c/0xa20 fs/quota/dquot.c:1777 stack backtrace: CPU: 1 PID: 6677 Comm: syz.1.552 Not tainted 6.1.147-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 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+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 dquot_commit+0x5a/0x410 fs/quota/dquot.c:507 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6790 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412 dquot_alloc_inode+0x765/0xa20 fs/quota/dquot.c:1801 ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:883 [inline] ext4_xattr_inode_lookup_create+0xc0/0x1d10 fs/ext4/xattr.c:1542 ext4_xattr_block_set+0x23a/0x32a0 fs/ext4/xattr.c:1876 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2413 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2515 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x168/0x2f0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x2b2/0x2d0 fs/xattr.c:617 path_setxattr+0x142/0x280 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:648 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f1cc258eb69 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:00007f1cc33ff038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007f1cc27b5fa0 RCX: 00007f1cc258eb69 RDX: 0000200000001400 RSI: 00002000000001c0 RDI: 0000200000000380 RBP: 00007f1cc2611df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1cc27b5fa0 R15: 00007ffcfb2fef58