syzbot

loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5362 at mm/page_alloc.c:4619 __alloc_pages_slowpath+0xcb3/0xce0 mm/page_alloc.c:4619
Modules linked in:
CPU: 0 UID: 0 PID: 5362 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__alloc_pages_slowpath+0xcb3/0xce0 mm/page_alloc.c:4619
Code: d8 48 c1 e8 03 0f b6 04 08 84 c0 75 2e f6 43 01 08 48 8b 14 24 0f 84 a2 f3 ff ff 90 0f 0b 90 e9 99 f3 ff ff e8 6e dc 63 09 90 <0f> 0b 90 f7 c5 00 04 00 00 75 bc 90 0f 0b 90 eb b6 89 d9 80 e1 07
RSP: 0018:ffffc9000d3678f0 EFLAGS: 00010246
RAX: 4801f73bea7d7800 RBX: 0000000000000002 RCX: dffffc0000000000
RDX: ffffc9000d367a00 RSI: 0000000000000002 RDI: 0000000000048cc0
RBP: 0000000000048cc0 R08: ffff88801b2f303f R09: 1ffff1100365e607
R10: dffffc0000000000 R11: ffffed100365e608 R12: ffffc9000d367a00
R13: 1ffff92001a6cf3c R14: 0000000000048cc0 R15: dffffc0000000000
FS:  00007f203b8356c0(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000084a000 CR3: 0000000043387000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:5161
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2487 [inline]
 allocate_slab+0xd9/0x370 mm/slub.c:2663
 new_slab mm/slub.c:2709 [inline]
 ___slab_alloc+0xbeb/0x1410 mm/slub.c:3891
 __slab_alloc mm/slub.c:3981 [inline]
 __slab_alloc_node mm/slub.c:4056 [inline]
 slab_alloc_node mm/slub.c:4217 [inline]
 __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4391
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 xfs_init_fs_context+0x54/0x500 fs/xfs/xfs_super.c:2278
 alloc_fs_context+0x64e/0x7d0 fs/fs_context.c:318
 do_new_mount+0x16f/0x9e0 fs/namespace.c:3787
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f203a99038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f203b834e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f203b834ef0 RCX: 00007f203a99038a
RDX: 0000200000009700 RSI: 0000200000009740 RDI: 00007f203b834eb0
RBP: 0000200000009700 R08: 00007f203b834ef0 R09: 0000000004000000
R10: 0000000004000000 R11: 0000000000000246 R12: 0000200000009740
R13: 00007f203b834eb0 R14: 00000000000097cb R15: 0000200000000140
 </TASK>