WARNING in ipvlan_l3s

WARNING in ipvlan_l3s_unregister
Status: upstream: reported syz repro on 2020/07/06 10:48
Reported-by: syzbot+bb3d7a24f705078b1286@syzkaller.appspotmail.com
First crash: 118d, last: 15d

Cause bisection: the bug happens on the oldest tested release
Crash: WARNING in sysfs_warn_dup (log)
Repro: syz .config

Sample crash report:

------------[ cut here ]------------
WARNING: CPU: 0 PID: 7217 at drivers/net/ipvlan/ipvlan_l3s.c:148 ipvlan_unregister_nf_hook drivers/net/ipvlan/ipvlan_l3s.c:148 [inline]
WARNING: CPU: 0 PID: 7217 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: 7217 Comm: syz-executor.0 Not tainted 5.8.0-rc7-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 32 57 dc fc 49 c7 06 00 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 ab 47 9d fc <0f> 0b eb c8 e8 a2 47 9d fc c6 05 ab e2 b1 04 01 48 c7 c7 ec f3 09
RSP: 0018:ffffc9000228f308 EFLAGS: 00010293
RAX: ffffffff84d74a95 RBX: 1ffff1101526eb18 RCX: ffff888095ba4400
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff84d74a1e R09: fffffbfff131a7ee
R10: fffffbfff131a7ee R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a93758c0 R14: ffff8880a2232000 R15: ffff888090f28040
 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+0x143d/0x1c10 net/core/rtnetlink.c:3398
 rtnetlink_rcv_msg+0x889/0xd40 net/core/rtnetlink.c:5461
 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: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8ba9a3fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002b740 RCX: 000000000045c369
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffc8b295b4f R14: 00007f8ba9a409c0 R15: 000000000078bf0c
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (31):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	Maintainers
ci-upstream-kasan-gce-smack-root	2020/07/29 20:09	upstream	6ba1b005	19a8de55	.config	log	report	syz	davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/07/26 07:10	upstream	23ee3e4e	1f7cc1ca	.config	log	report	syz	davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/09 10:43	upstream	34d4ddd3	0ea7a887	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/08 06:19	upstream	f4d51dff	abf9ba4f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/07 18:47	upstream	f4d51dff	abf9ba4f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/07 17:23	upstream	a8205e31	abf9ba4f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/07 00:09	upstream	dd9fb9bb	abf9ba4f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/04 16:07	upstream	59126901	abf9ba4f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/03 04:33	upstream	fc3abb53	abf9ba4f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/02 14:30	upstream	9c7d619b	abf9ba4f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/01 09:02	upstream	b51594df	d5a3ae1f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/01 07:53	upstream	b51594df	d5a3ae1f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/01 07:53	upstream	b51594df	d5a3ae1f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/09/01 07:35	upstream	b51594df	d5a3ae1f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/08/31 02:55	upstream	dcc5c6f0	d5a3ae1f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/08/29 12:23	upstream	4d41ead6	d5a3ae1f	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/08/25 01:58	upstream	6a9dc5fd	344da168	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/08/24 13:22	upstream	d012a719	67b599d1	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/08/21 10:11	upstream	da2968ff	6436ce4b	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/08/09 22:16	upstream	06a81c1c	70301872	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/08/02 19:21	upstream	ac3a0c84	63a73341	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/07/29 10:47	upstream	6ba1b005	19a8de55	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/07/26 12:19	upstream	04300d66	51265195	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/07/16 07:16	upstream	994e99a9	f3bec699	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/07/15 01:39	upstream	e9919e11	609fb517	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/07/03 23:24	upstream	7cc2a8ea	51095195	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/06/30 20:23	upstream	9ebcfadb	917afeaa	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/06/11 11:40	upstream	7ae77150	3ab7a05a	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/06/10 01:37	upstream	7ae77150	860c4de9	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/06/08 14:50	upstream	7ae77150	7604bb03	.config	log	report		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/05/29 04:26	upstream	75caf310	d19ed305	.config	log	report		allison@lohutok.net, davem@davemloft.net, gregkh@linuxfoundation.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, tglx@linutronix.de