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BUG: KASAN: use-after-free in __xfrm_state_delete+0x696/0xca0
Write of size 8 at addr ffff88802851fab0 by task syz.1.2116/10793

CPU: 0 UID: 0 PID: 10793 Comm: syz.1.2116 Not tainted 6.16.0-syzkaller-12084-g33caa208dba6-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 __xfrm_state_delete+0x696/0xca0
 xfrm_timer_handler+0x18f/0xa00
 __hrtimer_run_queues+0x52c/0xc60
 hrtimer_run_softirq+0x187/0x2b0
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x643/0x2390
Code: 28 00 74 08 48 89 df e8 3b 4f b0 00 48 8b 3b 48 85 ff 0f 84 5b 10 00 00 48 83 c7 10 e9 73 01 00 00 83 fb 04 0f 84 7b 01 00 00 <83> fb 05 0f 85 36 0c 00 00 48 8b 44 24 58 80 3c 28 00 74 11 4c 89
RSP: 0018:ffffc9000465f618 EFLAGS: 00000202
RAX: ffffc9000465f71d RBX: 0000000000000005 RCX: ffffffff8fb9e690
RDX: ffffffff90373c44 RSI: ffffffff90373c48 RDI: ffffffff8be32620
RBP: dffffc0000000000 R08: 000000000000000a R09: ffffffff8172c195
R10: ffffc9000465f738 R11: ffffffff81ac3890 R12: ffffffff90373c49
R13: ffffc9000465f738 R14: ffffc9000465f6e8 R15: ffffc9000465f720
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0x157/0x9c0
 evict+0x847/0x9c0
 __dentry_kill+0x209/0x660
 dput+0x19f/0x2b0
 __fput+0x68e/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f36b1f8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc97bddcc8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00000000000227aa RCX: 00007f36b1f8ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f36b21b7da0 R08: 0000000000000001 R09: 0000000297bddfbf
R10: 0000001b31a20000 R11: 0000000000000246 R12: 00007f36b21b5fac
R13: 00007f36b21b5fa0 R14: ffffffffffffffff R15: 00007ffc97bddde0
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2851f
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0000812a08 ffffea0000c470c8 0000000000000000
raw: 0000000000000000 ffff888020b4ccc0 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x440dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_COMP), pid 5852, tgid 5852 (syz-executor), ts 137288495289, free_ts 137362045225
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 alloc_pages_noprof+0xa9/0x190
 __pmd_alloc+0x3a/0x3b0
 copy_pmd_range+0x6dbb/0x71d0
 copy_page_range+0xc14/0x1270
 dup_mmap+0xf57/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x1706/0x3c00
 kernel_clone+0x21e/0x840
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 0 tgid 0 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __tlb_remove_table+0x2d2/0x3b0
 tlb_remove_table_rcu+0x85/0x100
 rcu_core+0xcab/0x1770
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20

Memory state around the buggy address:
 ffff88802851f980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802851fa00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88802851fa80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                     ^
 ffff88802851fb00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802851fb80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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