==================================================================
BUG: KASAN: slab-use-after-free in xfrm_state_find+0x2cf2/0x5400
Read of size 1 at addr ffff8881220a87b0 by task kworker/u10:2/40

CPU: 1 UID: 0 PID: 40 Comm: kworker/u10:2 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
Workqueue: iou_exit io_ring_exit_work
Call Trace:
 <IRQ>
 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+0x58a/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 tipc_udp_xmit+0x1c3/0xaa0
 tipc_udp_send_msg+0x27f/0x3f0
 tipc_bearer_xmit_skb+0x2b3/0x400
 tipc_disc_timeout+0x580/0x6d0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 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:deref_stack_reg+0x1c6/0x230
Code: 08 00 00 49 89 c6 48 8b 5c 24 18 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 03 4f b0 00 4c 89 33 b0 01 eb 02 31 c0 <48> 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 47 63 0a 0a cc 44 89
RSP: 0018:ffffc900006ef080 EFLAGS: 00000246
RAX: 1ffff920000dde01 RBX: ffffc900006ef1e8 RCX: 0000000000000001
RDX: ffffc900006ef1e8 RSI: dffffc0000000000 RDI: ffffc900006efc70
RBP: 1ffff920000dde35 R08: ffffc900006efc70 R09: 0000000000000000
R10: ffffc900006ef1f8 R11: fffff520000dde41 R12: 1ffff920000dde36
R13: 1ffff920000dde37 R14: ffff8881006aa05c R15: dffffc0000000000
 unwind_next_frame+0x17c4/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 fill_pool+0x100/0x570
 debug_object_activate+0x383/0x420
 call_rcu+0xaa/0x9c0
 kmem_cache_free+0x309/0x400
 __io_req_caches_free+0x8f/0x140
 io_req_caches_free+0x21/0x60
 io_ring_exit_work+0x415/0x930
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 29638:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 xfrm_state_find+0x37d4/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x2a7/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 udp_sendmsg+0x142e/0x2170
 __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

Freed by task 792:
 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 ffff8881220a8480
 which belongs to the cache xfrm_state of size 928
The buggy address is located 816 bytes inside of
 freed 928-byte region [ffff8881220a8480, ffff8881220a8820)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881220a8d80 pfn:0x1220a8
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff888104dcd280 ffffea00046e4110 ffffea000479af10
raw: ffff8881220a8d80 00000000000e0000 00000000f5000000 0000000000000000
head: 057ff00000000240 ffff888104dcd280 ffffea00046e4110 ffffea000479af10
head: ffff8881220a8d80 00000000000e0000 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea0004882a01 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 11051, tgid 11045 (syz.8.1690), ts 294184478908, free_ts 293777291260
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x2256/0x2330
 __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
 xfrm_state_find+0x37d4/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x2a7/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 udp_sendmsg+0x142e/0x2170
 __sock_sendmsg+0x19c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
page last free pid 6255 tgid 6255 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_lru_noprof+0x1c6/0x3d0
 shmem_alloc_inode+0x28/0x40
 alloc_inode+0x6a/0x1b0
 new_inode+0x22/0x170
 shmem_get_inode+0x346/0xe90
 shmem_mknod+0x18c/0x3e0
 path_openat+0x14f4/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0

Memory state around the buggy address:
 ffff8881220a8680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881220a8700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881220a8780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff8881220a8800: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881220a8880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
vkms_vblank_simulate: vblank timer overrun
