WARNING in input_mt_init

WARNING in input_mt_init_slots
Status: upstream: reported C repro on 2021/01/10 23:30
Reported-by: syzbot+0122fa359a69694395d5@syzkaller.appspotmail.com
First crash: 18d, last: 3d08h

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: 1 PID: 8471 at mm/page_alloc.c:4976 __alloc_pages_nodemask+0x5f8/0x730 mm/page_alloc.c:5011
Modules linked in:
CPU: 1 PID: 8471 Comm: syz-executor772 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__alloc_pages_nodemask+0x5f8/0x730 mm/page_alloc.c:4976
Code: 00 00 0c 00 0f 85 a7 00 00 00 8b 3c 24 4c 89 f2 44 89 e6 c6 44 24 70 00 48 89 6c 24 58 e8 d0 d7 ff ff 49 89 c5 e9 ea fc ff ff <0f> 0b e9 b5 fd ff ff 89 74 24 14 4c 89 4c 24 08 4c 89 74 24 18 e8
RSP: 0018:ffffc900015efbb8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff920002bdf7b RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000040dc0
RBP: 0000000000040dc0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81b1f7e1 R11: 0000000000000000 R12: 000000000000000b
R13: 000000000000000b R14: 0000000000000000 R15: ffff888025a36168
FS:  00000000006fc880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000012990000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 alloc_pages_current+0x18c/0x2a0 mm/mempolicy.c:2267
 alloc_pages include/linux/gfp.h:547 [inline]
 kmalloc_order+0x2e/0xb0 mm/slab_common.c:837
 kmalloc_order_trace+0x14/0x120 mm/slab_common.c:853
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:682 [inline]
 input_mt_init_slots drivers/input/input-mt.c:49 [inline]
 input_mt_init_slots+0xd9/0x5f0 drivers/input/input-mt.c:38
 uinput_create_device drivers/input/misc/uinput.c:327 [inline]
 uinput_ioctl_handler.isra.0+0x81d/0x1dc0 drivers/input/misc/uinput.c:870
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440e99
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc567274b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440e99
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000003
RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000246 R12: 00000000004026a0
R13: 0000000000402730 R14: 0000000000000000 R15: 0000000000000000

Crashes (12):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-kasan-gce	2021/01/08 04:17	upstream	f5e6c330	c104d4a3	.config	log	report	syz	C		akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce	2021/01/06 23:26	upstream	9f1abbe9	c104d4a3	.config	log	report	syz			akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce	2021/01/21 23:44	upstream	9791581c	d4f4eca5	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce	2021/01/18 12:15	upstream	a1339d63	fd103621	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-root	2021/01/08 07:15	upstream	f5e6c330	c104d4a3	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-root	2021/01/08 05:46	upstream	f5e6c330	c104d4a3	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-root	2021/01/08 05:46	upstream	f5e6c330	c104d4a3	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce	2021/01/08 03:38	upstream	f5e6c330	c104d4a3	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce	2021/01/08 03:38	upstream	f5e6c330	c104d4a3	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce	2021/01/06 23:09	upstream	9f1abbe9	c104d4a3	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-386	2021/01/08 05:27	upstream	f5e6c330	c104d4a3	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-386	2021/01/08 05:27	upstream	f5e6c330	c104d4a3	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org