WARNING in taprio

WARNING in taprio_change
Status: upstream: reported C repro on 2020/09/14 09:19
Reported-by: syzbot+d50710fd0873a9c6b40c@syzkaller.appspotmail.com
Fix commit: ed8157f1ebf1 net: sched: tapr: prevent cycle_time == 0 in parse_taprio_schedule
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32]
First crash: 316d, last: 78d

Cause bisection: introduced by (bisect log) :
commit b5b73b26b3ca34574124ed7ae9c5ba8391a7f176
Author: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Date: Thu Sep 10 00:03:11 2020 +0000

taprio: Fix allowing too small intervals

Crash: WARNING in taprio_change (log)
Repro: C syz .config

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/04/15 23:21	19m	ducheng2@gmail.com	patch	upstream	OK
2021/04/14 06:30	18m	ducheng2@gmail.com	patch	upstream	OK
2021/04/05 07:28	13m	ducheng2@gmail.com		upstream	report log

Sample crash report:

netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8396 at net/sched/sch_taprio.c:999 taprio_get_start_time net/sched/sch_taprio.c:999 [inline]
WARNING: CPU: 1 PID: 8396 at net/sched/sch_taprio.c:999 taprio_change+0x3119/0x3fe0 net/sched/sch_taprio.c:1550
Modules linked in:
CPU: 1 PID: 8396 Comm: syz-executor420 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:taprio_get_start_time net/sched/sch_taprio.c:999 [inline]
RIP: 0010:taprio_change+0x3119/0x3fe0 net/sched/sch_taprio.c:1550
Code: 8b 44 24 18 41 bc ea ff ff ff 48 c7 00 00 75 6b 8a e8 0b ce 3d fa 48 8b 7c 24 08 e8 41 a1 d5 01 e9 10 d9 ff ff e8 f7 cd 3d fa <0f> 0b 48 c7 c7 a0 74 6b 8a e8 39 a5 06 00 48 83 7c 24 18 00 74 2e
RSP: 0018:ffffc900019f71e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880358a8340 RSI: ffffffff8735c4d9 RDI: 0000000000000003
RBP: 167b39cca7849ed3 R08: 0000000000000000 R09: ffffffff901b797f
R10: ffffffff8735b403 R11: 1ffffffff1f4253d R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  000000000119b300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8b417cc000 CR3: 0000000015196000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 taprio_init+0x52e/0x670 net/sched/sch_taprio.c:1709
 qdisc_create+0x475/0x12f0 net/sched/sch_api.c:1247
 tc_modify_qdisc+0x4c8/0x1a50 net/sched/sch_api.c:1663
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:674
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4434b9
Code: 28 c3 e8 4a 15 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe01232a98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffe01232aa8 RCX: 00000000004434b9
RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe01232ab0
R13: 00007ffe01232ad0 R14: 00000000004b8018 R15: 00000000004004b8

Crashes (746):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-selinux-root	2021/05/02 10:43	upstream	d2b6f8a17919	77e2b668	.config	log	report	syz	C		WARNING in taprio_change
ci-upstream-kasan-gce-smack-root	2021/04/04 15:46	upstream	2023a53bdf41	6a81331a	.config	log	report	syz	C		WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/04/04 05:24	upstream	57fbdb15ec42	6a81331a	.config	log	report	syz	C		WARNING in taprio_change
ci-upstream-kasan-gce	2020/12/11 11:04	upstream	33dc9614dc20	f900b48c	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/09/28 15:01	upstream	a1b8638ba132	6bfdbe89	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/09/26 23:12	upstream	7c7ec3226f5f	2d5ea0cb	.config	log	report	syz	C
ci-upstream-net-this-kasan-gce	2020/11/02 04:13	net	859191b234f8	8bc4594f	.config	log	report	syz	C
ci-upstream-net-this-kasan-gce	2020/09/12 19:24	net	5760d9acbe95	ce441f06	.config	log	report	syz	C
ci-upstream-net-kasan-gce	2020/11/02 04:13	net-next	c43fd36f7fec	8bc4594f	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2021/05/08 08:50	upstream	d2b6f8a17919	bc5434be	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/05/07 16:24	upstream	d2b6f8a17919	f6da8120	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-selinux-root	2021/05/07 16:09	upstream	d2b6f8a17919	f6da8120	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/05/07 06:01	upstream	d2b6f8a17919	06585184	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-selinux-root	2021/05/06 22:25	upstream	d2b6f8a17919	06585184	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/05/03 07:03	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-selinux-root	2021/05/02 23:14	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-smack-root	2021/05/02 21:55	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce	2021/05/02 12:51	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-selinux-root	2021/05/02 06:00	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce	2021/05/01 22:38	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/05/01 17:06	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-smack-root	2021/05/01 15:13	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce	2021/05/01 11:25	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/04/28 02:30	upstream	57fa2369ab17	805b5003	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/04/28 00:20	upstream	57fa2369ab17	805b5003	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/04/27 06:43	upstream	4a0225c3d208	805b5003	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/04/26 10:50	upstream	9f4ad9e425a1	2a82f1b3	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-smack-root	2021/04/26 02:52	upstream	d2d09fbe33f8	2a82f1b3	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/04/25 19:43	upstream	2a1d7946fa53	36c88236	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-selinux-root	2021/04/24 10:42	upstream	e77a830c8297	17f0b706	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-selinux-root	2021/04/24 09:32	upstream	e77a830c8297	17f0b706	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-smack-root	2021/04/24 05:26	upstream	e77a830c8297	17f0b706	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/04/23 12:21	upstream	18a3c5f7abfd	17f0b706	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce	2021/04/22 16:19	upstream	16fc44d6387e	33c28d03	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce	2021/04/21 23:58	upstream	16fc44d6387e	2bc8999a	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce	2021/04/21 23:42	upstream	16fc44d6387e	2bc8999a	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/04/21 17:36	upstream	1fe5501ba1ab	95777977	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce	2021/04/21 16:20	upstream	1fe5501ba1ab	95777977	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-selinux-root	2021/04/20 22:04	upstream	7af08140979a	c0ced557	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-smack-root	2021/04/20 10:05	upstream	7af08140979a	4285c989	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-smack-root	2021/04/20 08:52	upstream	7af08140979a	4285c989	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce	2021/04/20 07:49	upstream	7af08140979a	4285c989	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-root	2021/04/19 14:43	upstream	bf05bf16c76b	50f523d7	.config	log	report			info	WARNING in taprio_change
ci-qemu-upstream	2021/04/17 18:17	upstream	9cdbf6467424	7e2b734b	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-smack-root	2021/04/17 17:58	upstream	9cdbf6467424	7e2b734b	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce	2021/04/15 18:32	upstream	7f75285ca572	fcdb12ba	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-386	2021/05/07 17:45	upstream	d2b6f8a17919	f6da8120	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-386	2021/05/03 00:28	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-386	2021/05/01 14:10	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-386	2021/04/27 09:53	upstream	4a0225c3d208	805b5003	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-386	2021/04/24 07:50	upstream	8db5efb83fa9	17f0b706	.config	log	report			info	WARNING in taprio_change
ci-qemu-upstream-386	2021/03/27 08:55	upstream	0f4498cef9f5	a8529b82	.config	log	report			info	WARNING in taprio_change
ci-upstream-net-this-kasan-gce	2021/04/19 12:13	net	88a5af943985	50f523d7	.config	log	report			info	WARNING in taprio_change
ci-upstream-net-this-kasan-gce	2021/04/17 17:21	net	f2764bd4f6a8	7e2b734b	.config	log	report			info	WARNING in taprio_change
ci-upstream-net-this-kasan-gce	2021/04/16 22:45	net	0e0704bb9ea0	7e2b734b	.config	log	report			info	WARNING in taprio_change
ci-upstream-net-kasan-gce	2021/05/06 21:13	net-next	95aafe911db6	06585184	.config	log	report			info	WARNING in taprio_change
ci-upstream-net-kasan-gce	2021/05/03 11:40	net-next	95aafe911db6	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-net-kasan-gce	2021/05/02 09:51	net-next	95aafe911db6	77e2b668	.config	log	report			info	WARNING in taprio_change
ci-upstream-net-kasan-gce	2021/04/25 19:17	net-next	b2f0ca00e6b3	36c88236	.config	log	report			info	WARNING in taprio_change
ci-upstream-net-kasan-gce	2021/04/24 23:42	net-next	b2f0ca00e6b3	17f0b706	.config	log	report			info	WARNING in taprio_change
ci-upstream-linux-next-kasan-gce-root	2021/04/20 09:59	linux-next	1216f02e46a4	4285c989	.config	log	report			info	WARNING in taprio_change
ci-upstream-linux-next-kasan-gce-root	2021/04/19 14:51	linux-next	1216f02e46a4	50f523d7	.config	log	report			info	WARNING in taprio_change
ci-upstream-kasan-gce-386	2021/01/07 20:13	upstream	71c061d24438	c104d4a3	.config	log	report			info
ci-upstream-net-this-kasan-gce	2020/09/12 19:06	net	5760d9acbe95	ce441f06	.config	log	report