debugfs: Directory 'hsr0' with parent 'hsr' already present!
Cannot create hsr debugfs directory
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 21227 Comm: syz-executor 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
 local_lock_acquire+0x38/0x94 include/linux/local_lock_internal.h:29
 ___slab_alloc+0x1d0/0xe98 mm/slub.c:3055
 __slab_alloc+0x74/0xd0 mm/slub.c:3240
 slab_alloc_node mm/slub.c:3325 [inline]
 __kmem_cache_alloc_node+0x294/0x314 mm/slub.c:3398
 kmalloc_trace+0x48/0x94 mm/slab_common.c:1026
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:990 [inline]
 nsim_fib_event_nb+0x170/0xdd4 drivers/net/netdevsim/fib.c:1043
 call_fib_notifier+0x54/0x84 net/core/fib_notifier.c:24
 call_fib4_notifier+0x50/0x80 net/ipv4/fib_notifier.c:16
 call_fib_entry_notifier net/ipv4/fib_trie.c:89 [inline]
 fib_leaf_notify net/ipv4/fib_trie.c:2182 [inline]
 fib_table_notify net/ipv4/fib_trie.c:2200 [inline]
 fib_notify+0x27c/0x4a0 net/ipv4/fib_trie.c:2223
 fib4_dump+0x64/0x80 net/ipv4/fib_notifier.c:45
 fib_net_dump net/core/fib_notifier.c:71 [inline]
 register_fib_notifier+0x168/0x348 net/core/fib_notifier.c:109
 nsim_fib_create+0x7cc/0x928 drivers/net/netdevsim/fib.c:1597
 nsim_drv_probe+0x604/0x974 drivers/net/netdevsim/dev.c:1587
 nsim_bus_probe+0x20/0x30 drivers/net/netdevsim/bus.c:239
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x39c/0xacc drivers/base/dd.c:639
 __driver_probe_device+0x1c8/0x358 drivers/base/dd.c:805
 driver_probe_device+0x78/0x324 drivers/base/dd.c:835
 __device_attach_driver+0x290/0x4d4 drivers/base/dd.c:963
 bus_for_each_drv+0x154/0x1e4 drivers/base/bus.c:429
 __device_attach+0x2ac/0x3dc drivers/base/dd.c:1035
 device_initial_probe+0x24/0x34 drivers/base/dd.c:1084
 bus_probe_device+0xbc/0x1c4 drivers/base/bus.c:489
 device_add+0xb04/0xefc drivers/base/core.c:3712
 device_register+0x28/0x38 drivers/base/core.c:3794
 nsim_bus_dev_new drivers/net/netdevsim/bus.c:290 [inline]
 new_device_store+0x2d0/0x514 drivers/net/netdevsim/bus.c:167
 bus_attr_store+0x80/0xa4 drivers/base/bus.c:124
 sysfs_kf_write+0x1f8/0x278 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x348/0x4c0 fs/kernfs/file.c:352
 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_write+0x12c/0x224 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 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