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: 282d, last: 1d12h

Cause bisection: the issue happens on the oldest tested release (bisect log)
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..

Fix bisection attempts:
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-smack-root	2021/01/17 02:45	upstream	0da0a8a0	19a8de55	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2020/11/11 04:10	upstream	eccc8767	19a8de55	.config	log	report	syz

Crashes (106):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info	Title
ci-upstream-kasan-gce-smack-root	2020/07/29 20:09	upstream	6ba1b005	19a8de55	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2020/07/26 07:10	upstream	23ee3e4e	1f7cc1ca	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2021/03/06 09:20	upstream	280d542f	56722561	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/03/05 11:28	upstream	280d542f	9d751681	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/03/03 18:59	upstream	f69d02e3	06ed56cd	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/03/03 13:29	upstream	f69d02e3	e5b64d68	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/03/03 02:46	upstream	7a7fd0de	e5b64d68	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/03/01 17:13	upstream	fe07bfda	4c37c133	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/27 20:37	upstream	5695e516	4c37c133	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/27 06:28	upstream	3fb6d0e0	4c37c133	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/21 14:53	upstream	e767b353	3e5ed8b4	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/07 11:02	upstream	825b5991	2ce644fc	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/07 09:46	upstream	825b5991	2ce644fc	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/06 12:31	upstream	1e0d27fc	0655e081	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/05 16:08	upstream	dd86e7fa	23a562df	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/05 14:12	upstream	dd86e7fa	23a562df	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/05 00:29	upstream	5c279c4c	23a562df	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/03 20:06	upstream	3afe9076	624dad51	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/03 03:54	upstream	3aaf0a27	624dad51	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/03 01:48	upstream	3aaf0a27	624dad51	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/02 07:08	upstream	88bb507a	e6b95f32	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/02 04:58	upstream	88bb507a	e6b95f32	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/01 08:11	upstream	1048ba83	fc9fd31e	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/02/01 07:02	upstream	1048ba83	fc9fd31e	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/01/31 14:29	upstream	6642d600	fc9fd31e	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/01/28 20:31	upstream	e5ff2cb9	7df34f59	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/01/27 09:18	upstream	2ab38c17	a0ebf917	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/01/25 11:28	upstream	6ee1d745	52e37319	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/01/25 09:05	upstream	6ee1d745	52e37319	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2021/01/22 18:31	upstream	83d09ad4	d4f4eca5	.config	log	report		info	WARNING in ipvlan_l3s_unregister
ci-upstream-kasan-gce-smack-root	2020/12/16 04:56	upstream	d635a69d	f213e07e	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/14 16:45	upstream	2c85ebc5	97183ed7	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/14 14:55	upstream	2c85ebc5	97183ed7	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/13 23:34	upstream	6bff9bb8	b22a7ec3	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/13 18:14	upstream	6bff9bb8	bca53db9	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/13 14:45	upstream	6bff9bb8	bca53db9	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/12 22:50	upstream	7b1b868e	bca53db9	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/12 13:50	upstream	7f376f19	bca53db9	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/11 08:25	upstream	33dc9614	f900b48c	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/10 16:32	upstream	a2f5ea9e	f900b48c	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/10 13:07	upstream	a2f5ea9e	c090b4da	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/09 18:56	upstream	a68a0262	c090b4da	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/09 04:49	upstream	7d8761ba	40cc414d	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/08 17:58	upstream	cd796ed3	a7f7f4a4	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/08 01:41	upstream	cd796ed3	51a9082e	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/12/07 13:53	upstream	0477e928	1190297f	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/11/24 22:39	upstream	80145ac2	e34b696c	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/11/24 03:30	upstream	d5beb314	1ab681a4	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/11/23 10:23	upstream	418baf2c	0d27f508	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/11/18 21:15	upstream	c2e7554e	0767f13f	.config	log	report		info
ci-upstream-kasan-gce-smack-root	2020/07/03 23:24	upstream	7cc2a8ea	51095195	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/05/29 04:26	upstream	75caf310	d19ed305	.config	log	report