==================================================================
BUG: KASAN: use-after-free in xfrm_state_find+0x2cf2/0x5400
Read of size 1 at addr ffff88803b084330 by task syz.3.1933/11019

CPU: 0 UID: 0 PID: 11019 Comm: syz.3.1933 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:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 xfrm_state_find+0x2cf2/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x2a7/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 rawv6_sendmsg+0xdab/0x1820
 __sock_sendmsg+0x19c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f28e138ebe9
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:00007f28e22ca038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f28e15c5fa0 RCX: 00007f28e138ebe9
RDX: 0000000000000021 RSI: 0000200000000480 RDI: 0000000000000004
RBP: 00007f28e1411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f28e15c6038 R14: 00007f28e15c5fa0 R15: 00007ffe7fe17f38
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x3b pfn:0x3b084
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea0000818308 ffffea000113a108 0000000000000000
raw: 000000000000003b 0000000000000002 00000000f0000000 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 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 6245, tgid 6245 (udevd), ts 232461302029, free_ts 232504590512
 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
 folio_alloc_noprof+0x1e/0x30
 filemap_alloc_folio_noprof+0xdf/0x470
 page_cache_ra_unbounded+0x2b9/0x7b0
 page_cache_sync_ra+0x3b9/0xb10
 filemap_get_pages+0x43c/0x1ea0
 filemap_read+0x3f6/0x11a0
 blkdev_read_iter+0x30a/0x440
 vfs_read+0x55a/0xa30
 ksys_read+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 8646 tgid 8646 stack trace:
 free_unref_folios+0xdbd/0x1520
 folios_put_refs+0x559/0x640
 mapping_try_invalidate+0x324/0x410
 close_fs_devices+0x448/0x870
 btrfs_close_devices+0xc5/0x560
 btrfs_free_fs_info+0x4f/0x3c0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88803b084200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88803b084280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88803b084300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                     ^
 ffff88803b084380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88803b084400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
