EXT4-fs (loop7): This should not happen!! Data will be lost
EXT4-fs error (device loop7): ext4_map_blocks:635: inode #15: comm syz.7.1194: lblock 0 mapped to illegal pblock 0 (length 1)
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 9064 Comm: syz.7.1194 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 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+0xf8/0x160 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+0x1b40/0x6544 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x6c/0xb4 kernel/locking/spinlock.c:162
 __stack_depot_save+0x1c4/0x4b8 lib/stackdepot.c:479
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x64/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x74/0x43c mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x234/0x318 mm/slub.c:3383
 mempool_alloc_slab+0x58/0x74 mm/mempool.c:512
 mempool_alloc+0x150/0x3f4 mm/mempool.c:392
 bio_alloc_bioset+0x388/0xf20 block/bio.c:521
 bio_alloc include/linux/bio.h:427 [inline]
 submit_bh_wbc+0x1c0/0x454 fs/buffer.c:2682
 submit_bh+0x2c/0x3c fs/buffer.c:2707
 ext4_commit_super+0x318/0x54c fs/ext4/super.c:6129
 ext4_handle_error+0x560/0x784 fs/ext4/super.c:677
 __ext4_error_inode+0x24c/0x398 fs/ext4/super.c:810
 __check_block_validity fs/ext4/inode.c:415 [inline]
 ext4_map_blocks+0xcfc/0x1770 fs/ext4/inode.c:-1
 ext4_iomap_begin_report+0x2b8/0x620 fs/ext4/inode.c:3616
 iomap_iter+0x5d4/0x10ec fs/iomap/iter.c:91
 iomap_seek_data+0xf8/0x2a8 fs/iomap/seek.c:95
 ext4_llseek+0x168/0x1fc fs/ext4/file.c:897
 vfs_llseek fs/read_write.c:289 [inline]
 ksys_lseek fs/read_write.c:302 [inline]
 __do_sys_lseek fs/read_write.c:313 [inline]
 __se_sys_lseek fs/read_write.c:311 [inline]
 __arm64_sys_lseek+0x13c/0x1c0 fs/read_write.c:311
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 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