CIFS: Attempting to mount //127.0.0.1/share
CIFS: decode_ntlmssp_challenge: authentication has been weakened as server does not support key exchange
CIFS: VFS: \\127.0.0.1 Error -104 sending data on socket to server
------------[ cut here ]------------
server->in_flight == 0
WARNING: fs/smb/client/smb2ops.c:104 at smb2_add_credits+0x1249/0x2b70 fs/smb/client/smb2ops.c:104, CPU#1: syz.2.175/6392
Modules linked in:
CPU: 1 UID: 0 PID: 6392 Comm: syz.2.175 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:smb2_add_credits+0x1249/0x2b70 fs/smb/client/smb2ops.c:104
Code: de 83 e6 01 31 ff e8 a6 1a b8 fe f6 c3 01 75 0a e8 9c 15 b8 fe e9 22 13 00 00 0f 1f 44 00 00 e8 8d 15 b8 fe e9 13 13 00 00 90 <0f> 0b 90 80 3d 3b 52 75 0d 01 0f 85 9e 03 00 00 e8 72 15 b8 fe 49
RSP: 0018:ffffc90006f8f198 EFLAGS: 00010246
RAX: ffffffff830fe118 RBX: 1ffff1100fef4c61 RCX: ffff88801290be80
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000002000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff83100e70 R12: ffff88807f7a6308
R13: ffffc90006f8f3b0 R14: ffff88807f7a6000 R15: 0000000000000000
FS:  00007fcb3f66b6c0(0000) GS:ffff88812495b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000007b3ce000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 add_credits fs/smb/client/cifsglob.h:894 [inline]
 compound_send_recv+0x13b4/0x2b90 fs/smb/client/transport.c:973
 cifs_send_recv+0x42/0x60 fs/smb/client/transport.c:1100
 SMB2_sess_sendreceive+0x22f/0x780 fs/smb/client/smb2pdu.c:1654
 SMB2_sess_auth_rawntlmssp_authenticate+0x465/0x800 fs/smb/client/smb2pdu.c:1937
 SMB2_sess_setup+0x475/0x8b0 fs/smb/client/smb2pdu.c:2044
 cifs_setup_session+0x86b/0x1130 fs/smb/client/connect.c:4161
 cifs_get_smb_ses+0x114d/0x1ff0 fs/smb/client/connect.c:2494
 cifs_mount_get_session+0xf1/0x440 fs/smb/client/connect.c:3578
 get_session fs/smb/client/dfs.c:65 [inline]
 dfs_mount_share+0x22e/0x990 fs/smb/client/dfs.c:275
 cifs_mount+0xcc/0xbf0 fs/smb/client/connect.c:3860
 cifs_smb3_do_mount+0x2d0/0x8a0 fs/smb/client/cifsfs.c:1026
 smb3_get_tree_common fs/smb/client/fs_context.c:897 [inline]
 smb3_get_tree+0x2dd/0x400 fs/smb/client/fs_context.c:917
 vfs_get_tree+0x92/0x2a0 fs/super.c:1933
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3772 [inline]
 do_new_mount+0x319/0xdc0 fs/namespace.c:3848
 do_mount fs/namespace.c:4181 [inline]
 __do_sys_mount fs/namespace.c:4396 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4373
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb3e79e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb3f66b028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcb3ea25fa0 RCX: 00007fcb3e79e159
RDX: 0000200000000200 RSI: 0000200000000100 RDI: 0000200000000500
RBP: 00007fcb3e83506b R08: 0000200000000300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcb3ea26038 R14: 00007fcb3ea25fa0 R15: 00007ffc477c3ee8
 </TASK>