syzbot

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WARNING: CPU: 1 PID: 5944 at net/core/page_pool.c:594 __page_pool_put_page net/core/page_pool.c:594 [inline]
WARNING: CPU: 1 PID: 5944 at net/core/page_pool.c:594 page_pool_put_defragged_page+0x9a/0x9b0 net/core/page_pool.c:641
Modules linked in:
CPU: 1 PID: 5944 Comm: syz.0.16 Not tainted 6.6.100-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__page_pool_put_page net/core/page_pool.c:594 [inline]
RIP: 0010:page_pool_put_defragged_page+0x9a/0x9b0 net/core/page_pool.c:641
Code: e8 eb 20 0b f9 eb 47 e8 e4 20 0b f9 eb 40 65 44 8b 25 16 12 88 77 31 ff 44 89 e6 e8 80 24 0b f9 45 85 e4 74 09 e8 c6 20 0b f9 <0f> 0b eb 20 65 44 8b 25 f2 11 88 77 31 ff 44 89 e6 e8 60 24 0b f9
RSP: 0018:ffffc90002d468f0 EFLAGS: 00010093
RAX: ffffffff887a7b1f RBX: 0000000000000000 RCX: ffff88807a78da00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffff88807a78da00 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffffea0001e13a80 R14: ffff88807ce8e000 R15: 00000000ffffffff
FS:  000055558a64f500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ebed18d000 CR3: 00000000786c7000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 tun_ptr_free drivers/net/tun.c:617 [inline]
 __ptr_ring_swap_queue include/linux/ptr_ring.h:570 [inline]
 ptr_ring_resize_multiple include/linux/ptr_ring.h:641 [inline]
 tun_queue_resize drivers/net/tun.c:3685 [inline]
 tun_device_event+0xa66/0x1030 drivers/net/tun.c:3705
 notifier_call_chain+0x197/0x390 kernel/notifier.c:93
 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
 call_netdevice_notifiers net/core/dev.c:2078 [inline]
 dev_change_tx_queue_len+0x121/0x260 net/core/dev.c:8859
 do_setlink+0xf93/0x3fb0 net/core/rtnetlink.c:2928
 rtnl_setlink+0x399/0x4b0 net/core/rtnetlink.c:3208
 rtnetlink_rcv_msg+0x7c7/0xf10 net/core/rtnetlink.c:6475
 netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2555
 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
 netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1356
 netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1904
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
 ___sys_sendmsg+0x220/0x290 net/socket.c:2649
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2687 [inline]
 __se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2f3a98e9a9
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:00007ffde110e358 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2f3abb5fa0 RCX: 00007f2f3a98e9a9
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 000000000000000c
RBP: 00007f2f3aa10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2f3abb5fa0 R14: 00007f2f3abb5fa0 R15: 0000000000000003
 </TASK>