==================================================================
BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x696/0xca0
Write of size 8 at addr ffff8881151e8930 by task cmp/13648

CPU: 0 UID: 0 PID: 13648 Comm: cmp Not tainted syzkaller #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:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 5b 68 4a f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> e3 0e 13 f6 65 8b 05 6c e1 23 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90009c16f80 EFLAGS: 00000206
RAX: ba72f175a65cc600 RBX: 0000000000000a06 RCX: ba72f175a65cc600
RDX: 0000000000000006 RSI: ffffffff8d9ba307 RDI: 0000000000000001
RBP: ffffc90009c17000 R08: ffffffff8fa3a737 R09: 1ffffffff1f474e6
R10: dffffc0000000000 R11: fffffbfff1f474e7 R12: dffffc0000000000
R13: 0000000000000004 R14: ffff88801a44ac00 R15: 1ffff92001382df0
 get_partial_node+0x35f/0x390
 ___slab_alloc+0xb3f/0x1420
 kmem_cache_alloc_noprof+0x283/0x3c0
 mas_alloc_nodes+0x2e9/0x8e0
 mas_preallocate+0x3ad/0x6f0
 mmap_region+0xf1e/0x20c0
 do_mmap+0xc45/0x10d0
 vm_mmap_pgoff+0x2a6/0x4d0
 elf_load+0x248/0x6c0
 load_elf_binary+0x1079/0x2740
 bprm_execve+0x99c/0x1450
 do_execveat_common+0x510/0x6a0
 __x64_sys_execve+0x94/0xb0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f420fbb4ef7
Code: Unable to access opcode bytes at 0x7f420fbb4ecd.
RSP: 002b:00007ffdbd0c6338 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055cda7858020 RCX: 00007f420fbb4ef7
RDX: 000055cda7858048 RSI: 000055cda7858020 RDI: 000055cda78580d0
RBP: 000055cda78580d0 R08: fefefefefefefeff R09: fefefefeff6f6c62
R10: 000000000fb8fb01 R11: 0000000000000246 R12: 000055cda7858048
R13: 00007f420fd62904 R14: 000055cda7858048 R15: 0000000000000000
 </TASK>

Allocated by task 9968:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 __find_acq_core+0x8a7/0x1c00
 xfrm_find_acq+0x78/0xa0
 xfrm_alloc_userspi+0x6b3/0xc90
 xfrm_user_rcv_msg+0x7a3/0xab0
 netlink_rcv_skb+0x208/0x470
 xfrm_netlink_rcv+0x79/0x90
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 9375:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 xfrm_state_gc_task+0x52d/0x6b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff8881151e8900
 which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
 freed 928-byte region [ffff8881151e8900, ffff8881151e8ca0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881151ead00 pfn:0x1151e8
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff8881049ac8c0 dead000000000122 0000000000000000
raw: ffff8881151ead00 00000000800e0004 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff8881049ac8c0 dead000000000122 0000000000000000
head: ffff8881151ead00 00000000800e0004 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea0004547a01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6038, tgid 6037 (syz.1.32), ts 68547960551, free_ts 68529300252
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1420
 kmem_cache_alloc_noprof+0x283/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 pfkey_add+0x6e4/0x2e00
 pfkey_sendmsg+0xbfe/0x1090
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 6038 tgid 6037 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 stack_depot_save_flags+0x436/0x860
 kasan_save_track+0x4f/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 skb_clone+0x212/0x3a0
 dev_queue_xmit_nit+0x416/0xcc0
 dev_hard_start_xmit+0x1be/0x830
 sch_direct_xmit+0x241/0x4b0
 __dev_queue_xmit+0x1857/0x3b50
 ip6_finish_output2+0x11bc/0x16a0
 ip6_mr_output+0x4e9/0x1100
 ip6_send_skb+0x1d5/0x390
 rawv6_push_pending_frames+0x6e9/0x8d0
 rawv6_sendmsg+0x1331/0x1820
 __sock_sendmsg+0x19c/0x270

Memory state around the buggy address:
 ffff8881151e8800: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881151e8880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881151e8900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff8881151e8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881151e8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
