loop3: detected capacity change from 0 to 4096
EXT4-fs (loop3): mounted filesystem without journal. Quota mode: writeback.
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 PID: 6575 Comm: syz.3.496 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3777 [inline]
 validate_chain kernel/locking/lockdep.c:3798 [inline]
 __lock_acquire+0x1864/0x6634 kernel/locking/lockdep.c:5063
 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676
 do_write_seqcount_begin_nested include/linux/seqlock.h:515 [inline]
 do_write_seqcount_begin include/linux/seqlock.h:541 [inline]
 psi_group_change+0x240/0x1430 kernel/sched/psi.c:801
 psi_task_change+0xec/0x234 kernel/sched/psi.c:924
 psi_enqueue kernel/sched/stats.h:143 [inline]
 enqueue_task kernel/sched/core.c:2056 [inline]
 activate_task+0x220/0x240 kernel/sched/core.c:2088
 ttwu_do_activate+0x150/0x214 kernel/sched/core.c:3700
 ttwu_queue kernel/sched/core.c:3905 [inline]
 try_to_wake_up+0x424/0xcb4 kernel/sched/core.c:4228
 wake_up_process+0x18/0x24 kernel/sched/core.c:4362
 wake_up_worker kernel/workqueue.c:859 [inline]
 insert_work+0x2a4/0x37c kernel/workqueue.c:1369
 __queue_work+0xd00/0x1280 kernel/workqueue.c:1520
 queue_work_on+0xc0/0x164 kernel/workqueue.c:1548
 queue_work include/linux/workqueue.h:512 [inline]
 loop_queue_work drivers/block/loop.c:893 [inline]
 loop_queue_rq+0x91c/0xa48 drivers/block/loop.c:1874
 __blk_mq_issue_directly block/blk-mq.c:2643 [inline]
 __blk_mq_try_issue_directly+0x3f8/0x63c block/blk-mq.c:2696
 blk_mq_try_issue_directly+0x3c/0x1e0 block/blk-mq.c:2720
 blk_mq_submit_bio+0xfbc/0x1ad8 block/blk-mq.c:3058
 __submit_bio+0x1d8/0x260 block/blk-core.c:591
 __submit_bio_noacct_mq block/blk-core.c:668 [inline]
 submit_bio_noacct_nocheck+0x65c/0xa1c block/blk-core.c:697
 submit_bio_noacct+0xc6c/0x1670 block/blk-core.c:808
 submit_bio+0x29c/0x3d0 block/blk-core.c:853
 submit_bh_wbc+0x394/0x44c fs/buffer.c:2702
 submit_bh+0x2c/0x3c fs/buffer.c:2707
 __ext4_read_bh fs/ext4/super.c:174 [inline]
 ext4_read_bh+0x164/0x260 fs/ext4/super.c:198
 ext4_read_bh_lock+0xe0/0x110 fs/ext4/super.c:213
 ext4_bread+0x108/0x1a8 fs/ext4/inode.c:954
 ext4_quota_read+0x160/0x358 fs/ext4/super.c:7182
 read_blk fs/quota/quota_tree.c:61 [inline]
 find_tree_dqentry+0x178/0xc2c fs/quota/quota_tree.c:671
 find_tree_dqentry+0x4fc/0xc2c fs/quota/quota_tree.c:698
 find_tree_dqentry+0x4fc/0xc2c fs/quota/quota_tree.c:698
 find_tree_dqentry+0x4fc/0xc2c fs/quota/quota_tree.c:698
 find_dqentry fs/quota/quota_tree.c:716 [inline]
 qtree_read_dquot+0x45c/0x748 fs/quota/quota_tree.c:736
 v2_read_dquot+0xbc/0x118 fs/quota/quota_v2.c:336
 dquot_acquire+0x108/0x4b8 fs/quota/dquot.c:491
 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6837
 dqget+0x638/0xa98 fs/quota/dquot.c:1013
 __dquot_initialize+0x2e4/0xb30 fs/quota/dquot.c:1542
 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1604
 ext4_create+0x9c/0x410 fs/ext4/namei.c:2876
 lookup_open fs/namei.c:3490 [inline]
 open_last_lookups fs/namei.c:3558 [inline]
 path_openat+0xda8/0x27a0 fs/namei.c:3788
 do_filp_open+0x198/0x38c fs/namei.c:3818
 do_sys_openat2+0x134/0x3fc fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __arm64_sys_openat+0x11c/0x150 fs/open.c:1347
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 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