CIFS: Attempting to mount //127.0.0.1/share
CIFS: VFS: \\127.0.0.1 Error -512 sending data on socket to server
------------[ cut here ]------------
server->in_flight == 0
WARNING: fs/smb/client/smb2ops.c:104 at smb2_add_credits+0x1213/0x1790 fs/smb/client/smb2ops.c:104, CPU#1: syz.5.3004/15709
Modules linked in:
CPU: 1 UID: 0 PID: 15709 Comm: syz.5.3004 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:smb2_add_credits+0x1213/0x1790 fs/smb/client/smb2ops.c:104
Code: c6 e8 e1 cb b1 fe 84 db 0f 85 0a fb ff ff e8 c4 d1 b1 fe 48 8d 3d 9d 1d f3 0d 67 48 0f b9 3a e9 f4 fa ff ff e8 ae d1 b1 fe 90 <0f> 0b 90 0f b6 05 99 99 d3 0d 31 ff 89 c6 88 44 24 28 e8 a6 cb b1
RSP: 0000:ffffc900040871e8 EFLAGS: 00010246
RAX: 0000000000080000 RBX: ffff88805661c300 RCX: ffffc90026541000
RDX: 0000000000080000 RSI: ffffffff83599022 RDI: ffff8880278a8000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90004087428
R13: 0000000000000200 R14: 0000000000000001 R15: ffff88805661c000
FS:  0000000000000000(0000) GS:ffff888096a60000(0063) knlGS:00000000f5394b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000c3c04ad CR3: 000000004bcf9000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 add_credits fs/smb/client/cifsglob.h:894 [inline]
 compound_send_recv+0x1030/0x2a10 fs/smb/client/transport.c:978
 cifs_send_recv+0x43/0x60 fs/smb/client/transport.c:1105
 SMB2_negotiate+0x15c4/0x5380 fs/smb/client/smb2pdu.c:1188
 cifs_negotiate_protocol fs/smb/client/connect.c:4040 [inline]
 cifs_negotiate_protocol+0x268/0x4c0 fs/smb/client/connect.c:4011
 cifs_get_smb_ses+0xfc9/0x2170 fs/smb/client/connect.c:2492
 cifs_mount_get_session+0xf8/0x460 fs/smb/client/connect.c:3578
 get_session fs/smb/client/dfs.c:65 [inline]
 dfs_mount_share+0x200/0x1e20 fs/smb/client/dfs.c:275
 cifs_mount+0xc4/0xdb0 fs/smb/client/connect.c:3860
 cifs_smb3_do_mount+0x2c0/0x1b10 fs/smb/client/cifsfs.c:1026
 smb3_get_tree_common fs/smb/client/fs_context.c:897 [inline]
 smb3_get_tree fs/smb/client/fs_context.c:917 [inline]
 smb3_get_tree+0x1fd/0x440 fs/smb/client/fs_context.c:909
 vfs_get_tree+0x92/0x320 fs/super.c:1947
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3772 [inline]
 do_new_mount fs/namespace.c:3848 [inline]
 path_mount+0x7d0/0x24c0 fs/namespace.c:4168
 do_mount fs/namespace.c:4181 [inline]
 __do_sys_mount fs/namespace.c:4397 [inline]
 __se_sys_mount fs/namespace.c:4374 [inline]
 __ia32_sys_mount+0x292/0x310 fs/namespace.c:4374
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f14fec
Code: Unable to access opcode bytes at 0xf7f14fc2.
RSP: 002b:00000000f539450c EFLAGS: 00000292 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 0000000080000000 RCX: 0000000080000040
RDX: 0000000080000080 RSI: 0000000000000000 RDI: 00000000800000c0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>