WARNING in bpf_cgroup_link

WARNING in bpf_cgroup_link_release
Status: upstream: reported C repro on 2020/04/15 06:55
Reported-by: syzbot+8a5dadc5c0b1d7055945@syzkaller.appspotmail.com
First crash: 469d, last: 18h28m

Cause bisection: failed (bisect log)

Sample crash report:

RBP: ffffffffffffffff R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00007ffeea853240 R14: 0000000000000000 R15: 0000000000000000
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6859 at kernel/bpf/cgroup.c:833 bpf_cgroup_link_release.part.0+0x28b/0x380 kernel/bpf/cgroup.c:833
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6859 Comm: syz-executor054 Not tainted 5.9.0-rc1-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+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x4a kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:bpf_cgroup_link_release.part.0+0x28b/0x380 kernel/bpf/cgroup.c:833
Code: 01 e8 ce e0 cd ff e9 f1 fe ff ff e8 3f 60 e7 ff 48 c7 c7 00 d4 bf 89 e8 83 ad 68 06 5b 5d 41 5c e9 2a 60 e7 ff e8 25 60 e7 ff <0f> 0b e9 01 fe ff ff e8 19 60 e7 ff e8 e4 2a d4 ff 31 ff 89 c3 89
RSP: 0018:ffffc90005367d38 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888094525700 RCX: ffffffff818cdceb
RDX: ffff8880978ec240 RSI: ffffffff818cdeeb RDI: 0000000000000005
RBP: 00000000fffffff4 R08: 0000000000000001 R09: ffffffff89c97453
R10: 0000000000000000 R11: 0000000035383654 R12: ffff888094525768
R13: ffffffffffffffa1 R14: 0000000000000022 R15: 0000000000000008
 bpf_cgroup_link_release kernel/bpf/cgroup.c:822 [inline]
 bpf_cgroup_link_detach+0x38/0x50 kernel/bpf/cgroup.c:854
 link_detach kernel/bpf/syscall.c:4009 [inline]
 __do_sys_bpf+0x667/0x4c20 kernel/bpf/syscall.c:4267
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x442229
Code: e8 1c b4 02 00 48 83 c4 18 c3 0f 1f 80 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 0f 83 6b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffeea8531e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442229
RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000022
RBP: ffffffffffffffff R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00007ffeea853240 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (501):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-net-this-kasan-gce	2020/09/01 02:57	net	bb8872a1e6bc	d5a3ae1f	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2021/07/03 19:51	upstream	3dbdb38e2869	55aa55c2	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-kasan-gce-smack-root	2021/07/03 04:49	upstream	3dbdb38e2869	55aa55c2	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-kasan-gce-root	2021/06/29 07:21	upstream	233a806b00e3	9d2ab5df	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-kasan-gce-root	2021/05/03 05:36	upstream	d2b6f8a17919	77e2b668	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/07/27 18:52	bpf	d6371c76e20d	fd511809	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/07/27 07:24	bpf	d6371c76e20d	fd511809	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/07/22 03:12	bpf	d6371c76e20d	29c3f20f	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/07/16 10:56	bpf	91091656252f	f115ae98	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/06/26 13:49	bpf	3db6735f2ef4	9d2ab5df	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-net-this-kasan-gce	2021/06/15 14:40	net	2214fb53006e	58636922	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/06/08 23:07	bpf	11fc79fc9f2e	5c2fe346	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/06/01 09:06	bpf	ff2e6efda0d5	032639db	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/05/29 12:40	bpf	ff2e6efda0d5	858ea628	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/05/28 22:22	bpf	ff2e6efda0d5	858ea628	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/05/12 23:44	bpf	c87db2405fe8	ed7d41c5	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/05/07 23:56	bpf	bbd6f0a94813	bc5434be	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/04/29 09:05	bpf	bbd6f0a94813	77e2b668	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/04/27 08:58	bpf	b02265429681	805b5003	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/04/26 05:28	bpf	b02265429681	2a82f1b3	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/04/17 22:22	bpf	b02265429681	7e2b734b	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/04/09 03:59	bpf	26f55a59dc65	6a81331a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/04/04 03:48	bpf	a14d273ba159	6a81331a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/07/26 13:37	bpf-next	2b7e9f25e590	fd511809	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-net-kasan-gce	2021/07/24 01:28	net-next	090597b4a9c1	bc5f1d88	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/07/22 05:24	bpf-next	807b8f0e24e6	29c3f20f	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/07/21 09:09	bpf-next	c39aa2159974	1b201b48	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/07/21 03:18	bpf-next	c39aa2159974	1b201b48	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/07/19 11:06	bpf-next	78e4a955928e	e6a17580	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/07/06 20:58	bpf-next	dbe69e433722	cca78469	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-net-kasan-gce	2021/07/05 00:19	net-next	5e437416ff66	55aa55c2	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/06/29 22:09	bpf-next	84fe73996c2e	a4fccb01	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/06/16 18:34	bpf-next	1f26622b791b	c06f97ad	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/06/09 18:55	bpf-next	380afe720896	84fe5d96	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/06/06 06:47	bpf-next	cf68fa431d5d	500c2339	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/06/05 11:02	bpf-next	cf68fa431d5d	500c2339	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/06/05 07:28	bpf-next	cf68fa431d5d	500c2339	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/05/29 11:07	bpf-next	e8e0f0f48478	858ea628	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/05/26 05:08	bpf-next	a720a2a0ad6c	93d3a9f6	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/05/17 22:12	bpf-next	f18ba26da88a	a343ba6b	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/05/15 00:58	bpf-next	513f485ca516	8bdd5343	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/05/05 21:23	bpf-next	3733bfbbdd28	06c27ff5	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/05/05 16:27	bpf-next	3733bfbbdd28	06c27ff5	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/05/02 10:31	bpf-next	3733bfbbdd28	77e2b668	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/04/22 10:00	bpf-next	d044d9fc1380	33c28d03	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/04/22 03:44	bpf-next	d044d9fc1380	2bc8999a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/04/19 18:07	bpf-next	cdf0e80e9fbe	50f523d7	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/04/14 03:14	bpf-next	db16c1fe92d7	a184b83e	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/04/10 11:17	bpf-next	92d3bff28aa4	bfeda1b1	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/01/16 09:36	bpf-next	eed6a9a9571b	65a7a854	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/04/14 20:11	bpf-next	1a323ea5356e	3f3c5574	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/07/08 12:21	linux-next	9e50b94b3eb0	51095195	.config	log	report