------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 13323 at lib/refcount.c:28 refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 13323 Comm: syz-executor.0 Not tainted 6.8.0-rc6-syzkaller-00238-g5ad3cb0ed525 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Code: ff 89 de e8 08 01 18 fd 84 db 0f 85 66 ff ff ff e8 7b 06 18 fd c6 05 96 e3 13 0b 01 90 48 c7 c7 c0 3c 6e 8b e8 17 2b dc fc 90 <0f> 0b 90 90 e9 43 ff ff ff e8 58 06 18 fd 0f b6 1d 71 e3 13 0b 31
RSP: 0018:ffffc90005d8f9c0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814f74b9
RDX: ffff888037090000 RSI: ffffffff814f74c6 RDI: 0000000000000001
RBP: ffff88803c764ee8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffc90005d8fa58
R13: ffff88803c764ee8 R14: ffff88802a577c00 R15: 1ffff92000bb1f43
FS:  00007f05ce5436c0(0000) GS:ffff88806b200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30b24000 CR3: 000000003461e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:272 [inline]
 __refcount_dec_and_test include/linux/refcount.h:304 [inline]
 refcount_dec_and_test include/linux/refcount.h:322 [inline]
 p9_req_put+0x1f4/0x250 net/9p/client.c:401
 p9_tag_cleanup net/9p/client.c:428 [inline]
 p9_client_destroy+0x22c/0x480 net/9p/client.c:1073
 v9fs_session_init+0xba5/0x1a80 fs/9p/v9fs.c:490
 v9fs_mount+0xc6/0xcd0 fs/9p/vfs_super.c:123
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1779
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x14ea/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __x64_sys_mount+0x297/0x320 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f05cd87dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f05ce5430c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f05cd9ac050 RCX: 00007f05cd87dda9
RDX: 00000000200004c0 RSI: 0000000020000480 RDI: 00000000200001c0
RBP: 00007f05cd8ca47a R08: 00000000200000c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f05cd9ac050 R15: 00007ffc29d5f958
 </TASK>