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BUG: KASAN: slab-out-of-bounds in __hlist_del include/linux/list.h:906 [inline]
BUG: KASAN: slab-out-of-bounds in hlist_del_init_rcu include/linux/rculist.h:184 [inline]
BUG: KASAN: slab-out-of-bounds in __xfrm_state_delete+0x384/0x918 net/xfrm/xfrm_state.c:700
Write of size 8 at addr ffff0000c4605d18 by task syz.8.970/8182

CPU: 1 PID: 8182 Comm: syz.8.970 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/31/2026
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
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_store8_noabort+0x2c/0x38 mm/kasan/report_generic.c:356
 __hlist_del include/linux/list.h:906 [inline]
 hlist_del_init_rcu include/linux/rculist.h:184 [inline]
 __xfrm_state_delete+0x384/0x918 net/xfrm/xfrm_state.c:700
 xfrm_timer_handler+0xec/0x810 net/xfrm/xfrm_state.c:631
 __run_hrtimer kernel/time/hrtimer.c:1751 [inline]
 __hrtimer_run_queues+0x444/0xc58 kernel/time/hrtimer.c:1815
 hrtimer_run_softirq+0x164/0x408 kernel/time/hrtimer.c:1832
 handle_softirqs+0x318/0xc90 kernel/softirq.c:596
 __do_softirq+0x14/0x20 kernel/softirq.c:630
 ____do_softirq+0x10/0x1c arch/arm64/kernel/irq.c:80
 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:901
 do_softirq_own_stack+0x1c/0x28 arch/arm64/kernel/irq.c:85
 invoke_softirq kernel/softirq.c:477 [inline]
 __irq_exit_rcu+0x23c/0x430 kernel/softirq.c:679
 irq_exit_rcu+0x14/0x84 kernel/softirq.c:691
 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline]
 el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:486
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:585
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:35 [inline]
 preempt_schedule_irq+0x84/0x1ac kernel/sched/core.c:6895
 arm64_preempt_schedule_irq+0x44/0x54 arch/arm64/kernel/entry-common.c:265
 __el1_irq arch/arm64/kernel/entry-common.c:474 [inline]
 el1_interrupt+0x3c/0x54 arch/arm64/kernel/entry-common.c:486
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:585
 local_daif_restore arch/arm64/include/asm/daifflags.h:117 [inline]
 do_notify_resume+0x110/0x2c84 arch/arm64/kernel/signal.c:1151
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_interrupt+0xc8/0x1bc arch/arm64/kernel/entry-common.c:719
 __el0_irq_handler_common+0x18/0x24 arch/arm64/kernel/entry-common.c:724
 el0t_64_irq_handler+0x10/0x1c arch/arm64/kernel/entry-common.c:729
 el0t_64_irq+0x18c/0x190 arch/arm64/kernel/entry.S:590

Allocated by task 4411:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 nsim_fib6_rt_nh_add+0x64/0x214 drivers/net/netdevsim/fib.c:500
 nsim_fib6_rt_create drivers/net/netdevsim/fib.c:562 [inline]
 nsim_fib6_rt_insert drivers/net/netdevsim/fib.c:752 [inline]
 nsim_fib6_event drivers/net/netdevsim/fib.c:856 [inline]
 nsim_fib_event drivers/net/netdevsim/fib.c:889 [inline]
 nsim_fib_event_work+0x1434/0x2708 drivers/net/netdevsim/fib.c:1494
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854

The buggy address belongs to the object at ffff0000c4605d00
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 24 bytes inside of
 128-byte region [ffff0000c4605d00, ffff0000c4605d80)

The buggy address belongs to the physical page:
page:000000000f9953f8 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000c4605900 pfn:0x104605
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 fffffc0003d5ba08 fffffc00032ed408 ffff0000c0002300
raw: ffff0000c4605900 000000000010000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c4605c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000c4605c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000c4605d00: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff0000c4605d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000c4605e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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