syzbot

==================================================================
BUG: KCSAN: data-race in page_pool_put_defragged_page / page_pool_refill_alloc_cache

write to 0xffff88815538d800 of 8 bytes by task 26690 on cpu 1:
 __ptr_ring_discard_one include/linux/ptr_ring.h:280 [inline]
 __ptr_ring_consume include/linux/ptr_ring.h:301 [inline]
 page_pool_refill_alloc_cache+0x271/0x380 net/core/page_pool.c:289
 __page_pool_get_cached net/core/page_pool.c:328 [inline]
 page_pool_alloc_pages+0x7a/0xa0 net/core/page_pool.c:492
 page_pool_dev_alloc_pages include/net/page_pool/helpers.h:96 [inline]
 xdp_test_run_batch net/bpf/test_run.c:299 [inline]
 bpf_test_run_xdp_live+0x399/0xe40 net/bpf/test_run.c:382
 bpf_prog_test_run_xdp+0x51e/0x8a0 net/bpf/test_run.c:1254
 bpf_prog_test_run+0x265/0x3d0 kernel/bpf/syscall.c:4040
 __sys_bpf+0x3af/0x780 kernel/bpf/syscall.c:5401
 __do_sys_bpf kernel/bpf/syscall.c:5487 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5485 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5485
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88815538d800 of 8 bytes by task 26685 on cpu 0:
 __ptr_ring_produce include/linux/ptr_ring.h:106 [inline]
 ptr_ring_produce_bh include/linux/ptr_ring.h:163 [inline]
 page_pool_recycle_in_ring net/core/page_pool.c:567 [inline]
 page_pool_put_defragged_page+0x2aa/0x450 net/core/page_pool.c:654
 page_pool_put_page include/net/page_pool/helpers.h:307 [inline]
 page_pool_put_full_page include/net/page_pool/helpers.h:323 [inline]
 napi_pp_put_page+0x146/0x260 net/core/skbuff.c:931
 skb_pp_recycle net/core/skbuff.c:942 [inline]
 skb_free_head net/core/skbuff.c:958 [inline]
 skb_release_data+0x511/0x550 net/core/skbuff.c:992
 skb_release_all net/core/skbuff.c:1058 [inline]
 __kfree_skb+0x44/0x140 net/core/skbuff.c:1072
 kfree_skb_reason+0xae/0x2b0 net/core/skbuff.c:1108
 __skb_queue_purge_reason include/linux/skbuff.h:3166 [inline]
 skb_queue_purge_reason+0x1ea/0x240 net/core/skbuff.c:3740
 skb_queue_purge include/linux/skbuff.h:3179 [inline]
 packet_release+0x6e3/0x7e0 net/packet/af_packet.c:3188
 __sock_release net/socket.c:659 [inline]
 sock_close+0x64/0x140 net/socket.c:1421
 __fput+0x299/0x630 fs/file_table.c:381
 __fput_sync+0x44/0x50 fs/file_table.c:466
 __do_sys_close fs/open.c:1554 [inline]
 __se_sys_close+0xfa/0x1a0 fs/open.c:1539
 __x64_sys_close+0x1f/0x30 fs/open.c:1539
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0xffffea0005b9bbc0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26685 Comm: syz-executor.3 Not tainted 6.7.0-syzkaller-02723-gde927f6c0b07 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
==================================================================