EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /2643/file0 supports timestamps until 2038-01-19 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.17.0-rc1-syzkaller-00016-g8742b2d8935f #0 Not tainted ------------------------------------------------------ syz.2.15288/22460 is trying to acquire lock: ffff888051863ca8 (&dquot->dq_lock){+.+.}-{4:4}, at: wait_on_dquot fs/quota/dquot.c:354 [inline] ffff888051863ca8 (&dquot->dq_lock){+.+.}-{4:4}, at: dqget+0x5f1/0x1180 fs/quota/dquot.c:972 but task is already holding lock: ffff888099c3b098 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ffff888099c3b098 (&ei->xattr_sem){++++}-{4:4}, at: ext4_xattr_set_handle+0x158/0x1480 fs/ext4/xattr.c:2362 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&ei->xattr_sem){++++}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1537 ext4_setattr+0x875/0x2ae0 fs/ext4/inode.c:5901 notify_change+0x6a9/0x1230 fs/attr.c:552 chown_common+0x54e/0x680 fs/open.c:791 do_fchownat+0x1a7/0x200 fs/open.c:822 __do_sys_chown fs/open.c:842 [inline] __se_sys_chown fs/open.c:840 [inline] __x64_sys_chown+0x7b/0xc0 fs/open.c:840 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (jbd2_handle){++++}-{0:0}: start_this_handle+0x5ea/0x1410 fs/jbd2/transaction.c:444 jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:501 jbd2_journal_start+0x29/0x40 fs/jbd2/transaction.c:540 ocfs2_start_trans+0x3b9/0x970 fs/ocfs2/journal.c:374 ocfs2_modify_bh+0xbd/0x490 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0xdad/0x16b0 fs/ocfs2/quota_local.c:767 dquot_load_quota_sb+0x83d/0x1050 fs/quota/dquot.c:2459 dquot_load_quota_inode fs/quota/dquot.c:2496 [inline] dquot_load_quota_inode+0x2a3/0x470 fs/quota/dquot.c:2488 ocfs2_enable_quotas+0x28a/0x5a0 fs/ocfs2/super.c:930 ocfs2_fill_super+0x1d7c/0x43b0 fs/ocfs2/super.c:1140 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692 vfs_get_tree+0x8e/0x340 fs/super.c:1815 do_new_mount fs/namespace.c:3805 [inline] path_mount+0x1482/0x1fd0 fs/namespace.c:4120 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount fs/namespace.c:4321 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4321 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&journal->j_trans_barrier){.+.+}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1537 ocfs2_start_trans+0x3ae/0x970 fs/ocfs2/journal.c:372 ocfs2_modify_bh+0xbd/0x490 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0xdad/0x16b0 fs/ocfs2/quota_local.c:767 dquot_load_quota_sb+0x83d/0x1050 fs/quota/dquot.c:2459 dquot_load_quota_inode fs/quota/dquot.c:2496 [inline] dquot_load_quota_inode+0x2a3/0x470 fs/quota/dquot.c:2488 ocfs2_enable_quotas+0x28a/0x5a0 fs/ocfs2/super.c:930 ocfs2_fill_super+0x1d7c/0x43b0 fs/ocfs2/super.c:1140 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692 vfs_get_tree+0x8e/0x340 fs/super.c:1815 do_new_mount fs/namespace.c:3805 [inline] path_mount+0x1482/0x1fd0 fs/namespace.c:4120 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount fs/namespace.c:4321 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4321 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (sb_internal#2){.+.+}-{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:1798 [inline] sb_start_intwrite include/linux/fs.h:1981 [inline] ocfs2_start_trans+0x29d/0x970 fs/ocfs2/journal.c:370 ocfs2_acquire_dquot+0x563/0xb00 fs/ocfs2/quota_global.c:860 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}: down_write+0x92/0x200 kernel/locking/rwsem.c:1590 ocfs2_create_local_dquot+0x157/0xb30 fs/ocfs2/quota_local.c:1227 ocfs2_acquire_dquot+0x626/0xb00 fs/ocfs2/quota_global.c:883 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&dquot->dq_lock){+.+.}-{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+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x193/0x10b0 kernel/locking/mutex.c:760 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x5f1/0x1180 fs/quota/dquot.c:972 __dquot_initialize+0x586/0xd50 fs/quota/dquot.c:1505 __ext4_new_inode+0x72d/0x4f00 fs/ext4/ialloc.c:994 ext4_xattr_inode_create fs/ext4/xattr.c:1478 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1588 [inline] ext4_xattr_inode_lookup_create+0x99a/0x1950 fs/ext4/xattr.c:1566 ext4_xattr_block_set+0x818/0x3650 fs/ext4/xattr.c:1908 ext4_xattr_set_handle+0xd2e/0x1480 fs/ext4/xattr.c:2447 ext4_xattr_set+0x14d/0x360 fs/ext4/xattr.c:2549 __vfs_setxattr+0x175/0x1e0 fs/xattr.c:200 __vfs_setxattr_noperm+0x127/0x660 fs/xattr.c:234 __vfs_setxattr_locked+0x182/0x260 fs/xattr.c:295 vfs_setxattr+0x145/0x360 fs/xattr.c:321 do_setxattr+0x145/0x180 fs/xattr.c:636 filename_setxattr+0x16b/0x1d0 fs/xattr.c:665 path_setxattrat+0x1de/0x2a0 fs/xattr.c:713 __do_sys_lsetxattr fs/xattr.c:754 [inline] __se_sys_lsetxattr fs/xattr.c:750 [inline] __x64_sys_lsetxattr+0xc9/0x140 fs/xattr.c:750 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 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: &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 *** 3 locks held by syz.2.15288/22460: #0: ffff888050b2e428 (sb_writers#4){.+.+}-{0:0}, at: filename_setxattr+0xbb/0x1d0 fs/xattr.c:663 #1: ffff888099c3b3b0 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #1: ffff888099c3b3b0 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: vfs_setxattr+0x122/0x360 fs/xattr.c:320 #2: ffff888099c3b098 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] #2: ffff888099c3b098 (&ei->xattr_sem){++++}-{4:4}, at: ext4_xattr_set_handle+0x158/0x1480 fs/ext4/xattr.c:2362 stack backtrace: CPU: 1 UID: 0 PID: 22460 Comm: syz.2.15288 Not tainted 6.17.0-rc1-syzkaller-00016-g8742b2d8935f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043 check_noncircular+0x14c/0x170 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+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x193/0x10b0 kernel/locking/mutex.c:760 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x5f1/0x1180 fs/quota/dquot.c:972 __dquot_initialize+0x586/0xd50 fs/quota/dquot.c:1505 __ext4_new_inode+0x72d/0x4f00 fs/ext4/ialloc.c:994 ext4_xattr_inode_create fs/ext4/xattr.c:1478 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1588 [inline] ext4_xattr_inode_lookup_create+0x99a/0x1950 fs/ext4/xattr.c:1566 ext4_xattr_block_set+0x818/0x3650 fs/ext4/xattr.c:1908 ext4_xattr_set_handle+0xd2e/0x1480 fs/ext4/xattr.c:2447 ext4_xattr_set+0x14d/0x360 fs/ext4/xattr.c:2549 __vfs_setxattr+0x175/0x1e0 fs/xattr.c:200 __vfs_setxattr_noperm+0x127/0x660 fs/xattr.c:234 __vfs_setxattr_locked+0x182/0x260 fs/xattr.c:295 vfs_setxattr+0x145/0x360 fs/xattr.c:321 do_setxattr+0x145/0x180 fs/xattr.c:636 filename_setxattr+0x16b/0x1d0 fs/xattr.c:665 path_setxattrat+0x1de/0x2a0 fs/xattr.c:713 __do_sys_lsetxattr fs/xattr.c:754 [inline] __se_sys_lsetxattr fs/xattr.c:750 [inline] __x64_sys_lsetxattr+0xc9/0x140 fs/xattr.c:750 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd74778ebe9 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:00007fd7459f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007fd7479b5fa0 RCX: 00007fd74778ebe9 RDX: 00002000000000c0 RSI: 0000200000000080 RDI: 0000200000000300 RBP: 00007fd747811e19 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fd3f R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd7479b6038 R14: 00007fd7479b5fa0 R15: 00007ffc2e0dcab8 EXT4-fs error (device loop2): ext4_validate_block_bitmap:440: comm syz.2.15288: bg 0: block 441: padding at end of block bitmap is not set