------------[ cut here ]------------
kmem_cache of name '9p-fcall-cache-(null)' already exists
WARNING: CPU: 1 PID: 5240 at mm/slab_common.c:108 kmem_cache_sanity_check mm/slab_common.c:107 [inline]
WARNING: CPU: 1 PID: 5240 at mm/slab_common.c:108 __kmem_cache_create_args+0xa7/0x320 mm/slab_common.c:303
Modules linked in:
CPU: 1 UID: 0 PID: 5240 Comm: syz-executor421 Not tainted 6.12.0-rc3-next-20241016-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:kmem_cache_sanity_check mm/slab_common.c:107 [inline]
RIP: 0010:__kmem_cache_create_args+0xa7/0x320 mm/slab_common.c:303
Code: 8e 48 8b 1b 48 39 eb 74 25 48 8b 7b f8 4c 89 fe e8 ce 95 e7 09 85 c0 75 e8 90 48 c7 c7 e7 08 0c 8e 4c 89 fe e8 ea 59 78 ff 90 <0f> 0b 90 90 4c 89 ff be 20 00 00 00 e8 28 97 e7 09 48 85 c0 0f 85
RSP: 0018:ffffc90003c37788 EFLAGS: 00010246
RAX: e556688e8a29a100 RBX: ffff88814b3eeba8 RCX: ffff88807a823c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8ea20cf8 R08: ffffffff8155d7b2 R09: 1ffff110170e519a
R10: dffffc0000000000 R11: ffffed10170e519b R12: 0000000000020018
R13: 0000000000000000 R14: ffffc90003c37860 R15: ffff88802ffcf240
FS:  000055555d3d9380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001900 CR3: 00000000123a6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kmem_cache_create_usercopy include/linux/slab.h:383 [inline]
 p9_client_create+0xbc0/0x1150 net/9p/client.c:1049
 v9fs_session_init+0x1e4/0x1b80 fs/9p/v9fs.c:410
 v9fs_mount+0xcf/0xaa0 fs/9p/vfs_super.c:122
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0af30dae69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff1bb8a048 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f0af312404e RCX: 00007f0af30dae69
RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000020000180 R09: 00000000000000a0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff1bb8a268 R14: 00007fff1bb8a070 R15: 00007fff1bb8a060
 </TASK>