WARNING in squashfs_read

WARNING in squashfs_read_table
Status: upstream: reported C repro on 2021/01/09 23:58
Reported-by: syzbot+2ccea6339d368360800d@syzkaller.appspotmail.com
First crash: 19d, last: 21h37m

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: WARNING in sysfs_warn_dup (log)
Repro: C syz .config

Sample crash report:

loop0: detected capacity change from 8 to 0
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8456 at mm/page_alloc.c:4977 __alloc_pages_nodemask+0x5f8/0x730 mm/page_alloc.c:5012
Modules linked in:
CPU: 0 PID: 8456 Comm: syz-executor943 Not tainted 5.11.0-rc2-next-20210105-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:4977
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:ffffc9000112fa98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff92000225f57 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000040cc0
RBP: 0000000000040cc0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81b25651 R11: 0000000000000000 R12: 0000000000000034
R13: 0000000000000034 R14: 0000000000000000 R15: 00000000e24d8401
FS:  00000000019a2880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559ed1ff3180 CR3: 000000001b421000 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:916
 kmalloc_order_trace+0x14/0x120 mm/slab_common.c:932
 kmalloc include/linux/slab.h:559 [inline]
 squashfs_read_table+0x43/0x1e0 fs/squashfs/cache.c:413
 squashfs_read_xattr_id_table+0x191/0x220 fs/squashfs/xattr_id.c:81
 squashfs_fill_super+0xcfb/0x23b0 fs/squashfs/super.c:225
 get_tree_bdev+0x421/0x740 fs/super.c:1291
 vfs_get_tree+0x89/0x2f0 fs/super.c:1496
 do_new_mount fs/namespace.c:2899 [inline]
 path_mount+0x12ae/0x1e70 fs/namespace.c:3230
 do_mount fs/namespace.c:3243 [inline]
 __do_sys_mount fs/namespace.c:3451 [inline]
 __se_sys_mount fs/namespace.c:3428 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3428
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446d1a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffe89cbd7b8 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe89cbd810 RCX: 0000000000446d1a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe89cbd7d0
RBP: 00007ffe89cbd7d0 R08: 00007ffe89cbd810 R09: 00007ffe00000015
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003

Crashes (22):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-linux-next-kasan-gce-root	2021/01/06 00:12	linux-next	83dadd4c	a0234d98	.config	log	report	syz	C		akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-smack-root	2021/01/24 10:31	upstream	e1ae4b0b	52e37319	.config	log	report			info	linux-kernel@vger.kernel.org, phillip@squashfs.org.uk
ci-upstream-kasan-gce-root	2021/01/24 04:07	upstream	e1ae4b0b	52e37319	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-smack-root	2021/01/21 02:25	upstream	75439bc4	d4f4eca5	.config	log	report			info	linux-kernel@vger.kernel.org, phillip@squashfs.org.uk
ci-upstream-kasan-gce-root	2021/01/19 17:23	upstream	1e2a199f	63631df1	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-root	2021/01/19 07:56	upstream	1e2a199f	63631df1	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-smack-root	2021/01/19 07:26	upstream	1e2a199f	63631df1	.config	log	report			info	linux-kernel@vger.kernel.org, phillip@squashfs.org.uk
ci-upstream-kasan-gce-root	2021/01/17 16:35	upstream	0da0a8a0	813be542	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-linux-next-kasan-gce-root	2021/01/21 00:43	linux-next	647060f3	d4f4eca5	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-root	2021/01/17 08:00	upstream	0da0a8a0	65a7a854	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-smack-root	2021/01/17 07:30	upstream	0da0a8a0	65a7a854	.config	log	report			info	linux-kernel@vger.kernel.org, phillip@squashfs.org.uk
ci-upstream-kasan-gce-root	2021/01/16 21:53	upstream	1d94330a	65a7a854	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-root	2021/01/11 08:21	upstream	0653161f	2c1f2513	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-root	2021/01/11 05:03	upstream	0653161f	2c1f2513	.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 11:04	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	2021/01/05 23:51	upstream	36bbbd0e	a0234d98	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce-root	2021/01/05 23:51	upstream	36bbbd0e	a0234d98	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-qemu-upstream-386	2021/01/17 07:22	upstream	0da0a8a0	65a7a854	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-linux-next-kasan-gce-root	2021/01/17 07:28	linux-next	b3a3cbde	65a7a854	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-linux-next-kasan-gce-root	2021/01/10 02:45	linux-next	1c925d20	2c1f2513	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-linux-next-kasan-gce-root	2021/01/06 00:01	linux-next	83dadd4c	a0234d98	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-linux-next-kasan-gce-root	2021/01/05 23:56	linux-next	83dadd4c	a0234d98	.config	log	report			info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org