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: 365d, last: 1d04h

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 (455):
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	bb8872a1	d5a3ae1f	.config	log	report	syz	C
ci-upstream-bpf-kasan-gce	2021/04/09 03:59	bpf	26f55a59	6a81331a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/04/04 03:48	bpf	a14d273b	6a81331a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/03/29 02:11	bpf	861de02e	a8529b82	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/03/26 13:13	bpf	00232240	6a383ecf	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/02/25 02:51	bpf	f566aac4	fcc6d71b	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/02/14 06:54	bpf	57baf8cc	98682e5e	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/02/09 11:54	bpf	6183f4d3	2bd9619f	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/02/07 05:33	bpf	6183f4d3	0655e081	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/01/29 16:24	bpf	150a2732	6593fd32	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-kasan-gce	2021/01/21 14:32	bpf	75439bc4	d4f4eca5	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/04/14 03:14	bpf-next	db16c1fe	a184b83e	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/04/10 11:17	bpf-next	92d3bff2	bfeda1b1	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/04/03 19:19	bpf-next	f07669df	6a81331a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/04/03 10:42	bpf-next	007bdc12	6a81331a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-net-kasan-gce	2021/04/02 09:11	net-next	bd78980b	6a81331a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/03/31 18:38	bpf-next	235fc0e3	6a81331a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/03/24 12:47	bpf-next	78b226d4	e613994b	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/03/23 11:59	bpf-next	9ef05281	8092f30d	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/03/05 06:08	bpf-next	86a35af6	9d751681	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/03/04 17:17	bpf-next	303dcc25	d7e4e604	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/02/27 08:50	bpf-next	a7d24d95	4c37c133	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/02/24 22:29	bpf-next	b9fc8b4a	fcc6d71b	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/02/23 04:00	bpf-next	d310ec03	c26fb06b	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/02/11 03:53	bpf-next	cf2d0a5e	a52ee10a	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/02/04 21:18	bpf-next	4c5de127	42b90a7c	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/02/04 15:29	bpf-next	5f10c1aa	42b90a7c	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/02/03 14:25	bpf-next	058107ab	624dad51	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/02/03 10:25	bpf-next	058107ab	624dad51	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/02/01 22:49	bpf-next	61ca36c8	e6b95f32	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/01/29 17:52	bpf-next	61ca36c8	6593fd32	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/01/28 23:48	bpf-next	8259fdeb	7df34f59	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/01/22 10:04	bpf-next	443edcef	d4f4eca5	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/01/22 08:07	bpf-next	443edcef	d4f4eca5	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/01/19 16:22	bpf-next	95204c9b	63631df1	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-bpf-next-kasan-gce	2021/01/17 17:37	bpf-next	232164e0	813be542	.config	log	report			info	WARNING in bpf_cgroup_link_release
ci-upstream-kasan-gce-root	2021/01/03 19:46	upstream	3516bd72	79264ae3	.config	log	report			info
ci-upstream-bpf-kasan-gce	2021/01/15 22:40	bpf	4237e9f4	65a7a854	.config	log	report			info
ci-upstream-bpf-kasan-gce	2021/01/13 14:05	bpf	b8d52264	a945f0a3	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/12/16 16:53	bpf	3db1a3fa	f213e07e	.config	log	report			info
ci-upstream-net-this-kasan-gce	2020/12/09 19:51	net	72d05c00	c090b4da	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/12/09 09:13	bpf	b6252700	40cc414d	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/12/05 16:23	bpf	12c8a8ca	50503117	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2021/01/16 09:36	bpf-next	eed6a9a9	65a7a854	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2021/01/08 20:36	bpf-next	e72afae4	c104d4a3	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/07 09:03	net-next	8209f5bc	c104d4a3	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2021/01/06 20:03	bpf-next	482ec343	c104d4a3	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2021/01/05 16:51	bpf-next	482ec343	a0234d98	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/28 00:23	bpf-next	00a279e4	2242f77f	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/12 20:47	bpf-next	b4fe9fec	bca53db9	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/03 18:07	bpf-next	97306be4	e6b0d314	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/11/29 04:21	bpf-next	bb1b25ca	a0092f9d	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/04/14 20:11	bpf-next	1a323ea5	3f3c5574	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/07/08 12:21	linux-next	9e50b94b	51095195	.config	log	report