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BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline]
BUG: KASAN: use-after-free in skb_unref include/linux/skbuff.h:1077 [inline]
BUG: KASAN: use-after-free in consume_skb+0x2e/0x160 net/core/skbuff.c:908
Read of size 4 at addr ffff888078912e9c by task kworker/1:9/20175

CPU: 1 PID: 20175 Comm: kworker/1:9 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events bpf_map_free_deferred
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247
 __kasan_report mm/kasan/report.c:433 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
 refcount_read include/linux/refcount.h:147 [inline]
 skb_unref include/linux/skbuff.h:1077 [inline]
 consume_skb+0x2e/0x160 net/core/skbuff.c:908
 __sk_msg_free+0x26d/0x360 net/core/skmsg.c:196
 sk_msg_free net/core/skmsg.c:209 [inline]
 __sk_psock_purge_ingress_msg net/core/skmsg.c:748 [inline]
 __sk_psock_zap_ingress net/core/skmsg.c:766 [inline]
 sk_psock_stop+0x415/0x620 net/core/skmsg.c:784
 sk_psock_drop+0x150/0x3d0 net/core/skmsg.c:826
 sk_psock_put include/linux/skmsg.h:461 [inline]
 sock_map_unref net/core/sock_map.c:182 [inline]
 sock_hash_free+0x714/0x930 net/core/sock_map.c:1141
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Allocated by task 31492:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:259 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3234 [inline]
 slab_alloc mm/slub.c:3242 [inline]
 kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3247
 skb_clone+0x170/0x3c0 net/core/skbuff.c:1517
 sk_psock_verdict_recv+0x72/0x780 net/core/skmsg.c:1157
 unix_read_sock+0xd7/0x250 net/unix/af_unix.c:2507
 sk_psock_verdict_data_ready+0x11a/0x180 net/core/skmsg.c:1200
 unix_dgram_sendmsg+0xf2c/0x1a10 net/unix/af_unix.c:2028
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x331/0x810 net/socket.c:2409
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
 __sys_sendmmsg+0x195/0x470 net/socket.c:2549
 __do_sys_sendmmsg net/socket.c:2578 [inline]
 __se_sys_sendmmsg net/socket.c:2575 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2575
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 10377:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749
 slab_free mm/slub.c:3513 [inline]
 kmem_cache_free+0xbd/0x5d0 mm/slub.c:3530
 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:700
 __kfree_skb net/core/skbuff.c:757 [inline]
 kfree_skb net/core/skbuff.c:774 [inline]
 kfree_skb+0x140/0x3f0 net/core/skbuff.c:768
 sock_drop include/linux/skmsg.h:310 [inline]
 sk_psock_backlog+0x9de/0xea0 net/core/skmsg.c:668
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff888078912dc0
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 220 bytes inside of
 232-byte region [ffff888078912dc0, ffff888078912ea8)
The buggy address belongs to the page:
page:ffffea0001e24480 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78912
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00013bad00 dead000000000004 ffff888015b83640
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 54, ts 323713214955, free_ts 323494062125
 prep_new_page mm/page_alloc.c:2418 [inline]
 get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369
 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191
 alloc_slab_page mm/slub.c:1793 [inline]
 allocate_slab mm/slub.c:1930 [inline]
 new_slab+0x32d/0x4a0 mm/slub.c:1993
 ___slab_alloc+0x918/0xfe0 mm/slub.c:3022
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109
 slab_alloc_node mm/slub.c:3200 [inline]
 slab_alloc mm/slub.c:3242 [inline]
 kmem_cache_alloc+0x35c/0x3a0 mm/slub.c:3247
 skb_clone+0x170/0x3c0 net/core/skbuff.c:1517
 netem_enqueue+0x1f6a/0x3550 net/sched/sch_netem.c:478
 dev_qdisc_enqueue+0x40/0x300 net/core/dev.c:3668
 __dev_xmit_skb net/core/dev.c:3752 [inline]
 __dev_queue_xmit+0x1f61/0x3640 net/core/dev.c:4077
 neigh_hh_output include/net/neighbour.h:525 [inline]
 neigh_output include/net/neighbour.h:539 [inline]
 ip_finish_output2+0x14d4/0x2160 net/ipv4/ip_output.c:221
 __ip_finish_output net/ipv4/ip_output.c:299 [inline]
 __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:281
 ip_finish_output+0x32/0x200 net/ipv4/ip_output.c:309
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0x196/0x310 net/ipv4/ip_output.c:423
 dst_output include/net/dst.h:451 [inline]
 ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3309 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3388
 __vunmap+0x781/0xb70 mm/vmalloc.c:2632
 free_work+0x58/0x70 mm/vmalloc.c:95
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff888078912d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff888078912e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888078912e80: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff888078912f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888078912f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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