================================================================== BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:906 [inline] BUG: KASAN: use-after-free in hlist_del_init_rcu include/linux/rculist.h:184 [inline] BUG: KASAN: use-after-free in __xfrm_state_delete+0x384/0x918 net/xfrm/xfrm_state.c:700 Write of size 8 at addr ffff0000d3f6c190 by task swapper/0/0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 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+0xc/0x18 arch/arm64/include/asm/irqflags.h:35 default_idle_call+0x68/0xd8 kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x368/0x600 kernel/sched/idle.c:323 cpu_startup_entry+0x5c/0x74 kernel/sched/idle.c:422 rest_init+0x2d4/0x2f0 init/main.c:706 start_kernel+0x0/0x510 init/main.c:865 start_kernel+0x47c/0x510 init/main.c:1113 __primary_switched+0xb8/0xc0 arch/arm64/kernel/head.S:468 Allocated by task 4323: 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] kernfs_iop_get_link+0x74/0x508 fs/kernfs/symlink.c:135 pick_link+0x58c/0xbc8 fs/namei.c:-1 step_into+0x954/0xbc4 fs/namei.c:1876 open_last_lookups fs/namei.c:3624 [inline] path_openat+0x1148/0x27a0 fs/namei.c:3835 do_filp_open+0x198/0x38c fs/namei.c:3865 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+0x58/0x12c 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:589 Freed by task 4323: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1735 [inline] slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1761 slab_free mm/slub.c:3694 [inline] __kmem_cache_free+0xbc/0x21c mm/slub.c:3707 kfree+0xd0/0x1a8 mm/slab_common.c:988 kfree_link+0x20/0x30 fs/libfs.c:1251 do_delayed_call include/linux/delayed_call.h:28 [inline] put_link fs/namei.c:1023 [inline] open_last_lookups fs/namei.c:3623 [inline] path_openat+0x107c/0x27a0 fs/namei.c:3835 do_filp_open+0x198/0x38c fs/namei.c:3865 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+0x58/0x12c 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:589 The buggy address belongs to the object at ffff0000d3f6c000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 400 bytes inside of 4096-byte region [ffff0000d3f6c000, ffff0000d3f6d000) The buggy address belongs to the physical page: page:00000000e841055b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113f68 head:00000000e841055b order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002a80 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d3f6c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d3f6c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d3f6c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d3f6c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d3f6c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================