loop9: detected capacity change from 0 to 512
EXT2-fs (loop9): (no)acl options not supported
EXT2-fs (loop9): warning: mounting ext3 filesystem as ext2
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 PID: 6870 Comm: syz.9.443 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec 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:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1864/0x6800 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 do_write_seqcount_begin_nested include/linux/seqlock.h:515 [inline]
 do_write_seqcount_begin include/linux/seqlock.h:541 [inline]
 psi_group_change+0x240/0x1344 kernel/sched/psi.c:801
 psi_task_change+0xec/0x244 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+0x424/0xc68 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+0xcbc/0x1234 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+0x94c/0xa7c drivers/block/loop.c:1874
 __blk_mq_issue_directly block/blk-mq.c:2643 [inline]
 __blk_mq_try_issue_directly+0x408/0x67c block/blk-mq.c:2696
 blk_mq_try_issue_directly+0x3c/0x1d8 block/blk-mq.c:2720
 blk_mq_submit_bio+0xff4/0x1be0 block/blk-mq.c:3057
 __submit_bio+0x1d8/0x260 block/blk-core.c:591
 __submit_bio_noacct_mq block/blk-core.c:668 [inline]
 submit_bio_noacct_nocheck+0x654/0xa14 block/blk-core.c:697
 submit_bio_noacct+0xcc0/0x16bc block/blk-core.c:808
 submit_bio+0x29c/0x3d0 block/blk-core.c:853
 submit_bh_wbc+0x384/0x44c fs/buffer.c:2702
 submit_bh fs/buffer.c:2707 [inline]
 __bh_read+0xa8/0x1ac fs/buffer.c:2976
 bh_read include/linux/buffer_head.h:435 [inline]
 read_block_bitmap+0x238/0x754 fs/ext2/balloc.c:148
 ext2_new_blocks+0x5ec/0x1114 fs/ext2/balloc.c:1304
 ext2_alloc_blocks fs/ext2/inode.c:418 [inline]
 ext2_alloc_branch fs/ext2/inode.c:487 [inline]
 ext2_get_blocks+0xb30/0x1b64 fs/ext2/inode.c:730
 ext2_get_block+0xc8/0x3e8 fs/ext2/inode.c:787
 __block_write_begin_int+0x350/0x1388 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x98/0x11c fs/buffer.c:2102
 ext2_write_begin+0x44/0x88 fs/ext2/inode.c:903
 generic_perform_write+0x234/0x4f4 mm/filemap.c:3862
 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960
 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989
 ext2_file_write_iter+0xc4/0x404 fs/ext2/file.c:179
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x3ec/0x7f0 fs/read_write.c:584
 ksys_pwrite64 fs/read_write.c:699 [inline]
 __do_sys_pwrite64 fs/read_write.c:709 [inline]
 __se_sys_pwrite64 fs/read_write.c:706 [inline]
 __arm64_sys_pwrite64+0x174/0x20c fs/read_write.c:706
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 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
EXT2-fs (loop9): error: ext2_valid_block_bitmap: Invalid block bitmap - block_group = 0, block = 252
EXT2-fs (loop9): error: ext2_get_inode: bad inode number: 15
EXT2-fs (loop9): error: ext2_fsync: detected IO error when writing metadata buffers