Re: WARNING in ipvlan_l3s_unregister

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    23ee3e4e Merge tag 'pci-v5.8-fixes-2' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17a1e4c4900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f3bc31881f1ae8a7
dashboard link: https://syzkaller.appspot.com/bug?extid=bb3d7a24f705078b1286
compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=151a0317100000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bb3d7a24f705078b1286@xxxxxxxxxxxxxxxxxxxxxxxxx

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WARNING: CPU: 0 PID: 7576 at drivers/net/ipvlan/ipvlan_l3s.c:148 ipvlan_unregister_nf_hook drivers/net/ipvlan/ipvlan_l3s.c:148 [inline]
WARNING: CPU: 0 PID: 7576 at drivers/net/ipvlan/ipvlan_l3s.c:148 ipvlan_l3s_unregister+0x145/0x1d0 drivers/net/ipvlan/ipvlan_l3s.c:221
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 7576 Comm: syz-executor.0 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 panic+0x264/0x7a0 kernel/panic.c:231
 __warn+0x227/0x250 kernel/panic.c:600
 report_bug+0x1b1/0x2e0 lib/bug.c:198
 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540
RIP: 0010:ipvlan_unregister_nf_hook drivers/net/ipvlan/ipvlan_l3s.c:148 [inline]
RIP: 0010:ipvlan_l3s_unregister+0x145/0x1d0 drivers/net/ipvlan/ipvlan_l3s.c:221
Code: 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 12 59 dc fc 49 c7 06 00 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 0b 4a 9d fc <0f> 0b eb c8 e8 02 4a 9d fc c6 05 4b e5 b1 04 01 48 c7 c7 ec f3 09
RSP: 0018:ffffc9000268f308 EFLAGS: 00010293
RAX: ffffffff84d747f5 RBX: 1ffff110137b3c38 RCX: ffff8880a7732400
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff84d7477e R09: fffffbfff131a7ee
R10: fffffbfff131a7ee R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88809bd9e1c0 R14: ffff8880914ae000 R15: ffff888097498040
 ipvlan_set_port_mode+0x33e/0x420 drivers/net/ipvlan/ipvlan_main.c:37
 ipvlan_link_new+0x733/0xab0 drivers/net/ipvlan/ipvlan_main.c:611
 __rtnl_newlink net/core/rtnetlink.c:3339 [inline]
 rtnl_newlink+0x143e/0x1bf0 net/core/rtnetlink.c:3397
 rtnetlink_rcv_msg+0x889/0xd40 net/core/rtnetlink.c:5460
 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2469
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0xa57/0xd70 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x519/0x800 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmsg+0x2b1/0x360 net/socket.c:2439
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c369
Code: Bad RIP value.
RSP: 002b:00007fff12787788 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002b740 RCX: 000000000045c369
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000790730
R13: 0000000000000000 R14: 0000000000000add R15: 000000000078bf0c
Kernel Offset: disabled
Rebooting in 86400 seconds..