syzbot

loop1: detected capacity change from 0 to 32768
------------[ cut here ]------------
kmem_cache of name 'gfs2-bufdata/syz:syz' already exists
WARNING: mm/slab_common.c:112 at kmem_cache_sanity_check mm/slab_common.c:111 [inline], CPU#1: syz.1.22/6097
WARNING: mm/slab_common.c:112 at __kmem_cache_create_args+0xac/0x440 mm/slab_common.c:352, CPU#1: syz.1.22/6097
Modules linked in:
CPU: 1 UID: 0 PID: 6097 Comm: syz.1.22 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:kmem_cache_sanity_check mm/slab_common.c:111 [inline]
RIP: 0010:__kmem_cache_create_args+0xaf/0x440 mm/slab_common.c:352
Code: 86 8e 4d 8b 24 24 49 81 fc 78 61 86 8e 74 20 49 8b 7c 24 f8 48 89 de e8 cf 18 9c 09 85 c0 75 e2 48 8d 3d c4 92 06 0e 48 89 de <67> 48 0f b9 3a 48 89 df be 20 00 00 00 e8 6f 1a 9c 09 48 85 c0 0f
RSP: 0018:ffffc900032e7948 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88807ed5ad40 RCX: 0000000000000005
RDX: 000000007ed5ad04 RSI: ffff88807ed5ad40 RDI: ffffffff9016d690
RBP: 0000000000000000 R08: ffffffff90123cf7 R09: 1ffffffff202479e
R10: dffffc0000000000 R11: fffffbfff202479f R12: ffff888036e0e920
R13: ffff8880784e0000 R14: 0000000000000050 R15: ffffc900032e7a60
FS:  0000555558a71500(0000) GS:ffff88812554a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f73cff77000 CR3: 00000000592b6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __kmem_cache_create include/linux/slab.h:390 [inline]
 gfs2_fill_super+0x13a4/0x21d0 fs/gfs2/ops_fstype.c:1202
 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694
 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1342
 vfs_get_tree+0x92/0x2a0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3764 [inline]
 do_new_mount+0x341/0xd30 fs/namespace.c:3840
 do_mount fs/namespace.c:4173 [inline]
 __do_sys_mount fs/namespace.c:4372 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4349
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd97db9da0a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc78677718 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc786777a0 RCX: 00007fd97db9da0a
RDX: 00002000000124c0 RSI: 0000200000012500 RDI: 00007ffc78677760
RBP: 00002000000124c0 R08: 00007ffc786777a0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000012500
R13: 00007ffc78677760 R14: 00000000000125c7 R15: 0000200000000180
 </TASK>
----------------
Code disassembly (best guess):
   0:	86 8e 4d 8b 24 24    	xchg   %cl,0x24248b4d(%rsi)
   6:	49 81 fc 78 61 86 8e 	cmp    $0xffffffff8e866178,%r12
   d:	74 20                	je     0x2f
   f:	49 8b 7c 24 f8       	mov    -0x8(%r12),%rdi
  14:	48 89 de             	mov    %rbx,%rsi
  17:	e8 cf 18 9c 09       	call   0x99c18eb
  1c:	85 c0                	test   %eax,%eax
  1e:	75 e2                	jne    0x2
  20:	48 8d 3d c4 92 06 0e 	lea    0xe0692c4(%rip),%rdi        # 0xe0692eb
  27:	48 89 de             	mov    %rbx,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 89 df             	mov    %rbx,%rdi
  32:	be 20 00 00 00       	mov    $0x20,%esi
  37:	e8 6f 1a 9c 09       	call   0x99c1aab
  3c:	48 85 c0             	test   %rax,%rax
  3f:	0f                   	.byte 0xf