[syzbot] [net?] [s390?] general protection fault in __smc_diag_dump (3)

[syzbot <syzbot+271fed3ed6f24600c364@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    c2ee9f594da8 KVM: selftests: Fix build on on non-x86 archi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1480ca5f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1673a5aaa7e19b23
dashboard link: https://syzkaller.appspot.com/bug?extid=271fed3ed6f24600c364
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12c38287980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12b0d0a7980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/df7d94abc0db/disk-c2ee9f59.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1945eac19921/vmlinux-c2ee9f59.xz
kernel image: https://storage.googleapis.com/syzbot-assets/19b610273055/bzImage-c2ee9f59.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+271fed3ed6f24600c364@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc0000002c03: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: probably user-memory-access in range [0x0000000000016018-0x000000000001601f]
CPU: 1 UID: 0 PID: 5244 Comm: syz-executor189 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline]
RIP: 0010:__smc_diag_dump.constprop.0+0x3e2/0x2500 net/smc/smc_diag.c:89
Code: 4c 8b b3 58 05 00 00 4d 85 f6 0f 84 f6 02 00 00 e8 63 55 d2 f6 49 8d 7e 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 86 1c 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b
RSP: 0018:ffffc90003467160 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88802f600000 RCX: ffffffff88fe4534
RDX: 0000000000002c03 RSI: ffffffff8aba62ed RDI: 0000000000016018
RBP: ffff88802f13c5e0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 00000000000a2001 R12: 0000000000000000
R13: ffff888011d50000 R14: 0000000000016000 R15: 0000000000000002
FS:  00007f3a23bc56c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000140 CR3: 0000000029904000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 smc_diag_dump_proto+0x26d/0x420 net/smc/smc_diag.c:217
 smc_diag_dump+0x27/0x90 net/smc/smc_diag.c:234
 netlink_dump+0x552/0xcc0 net/netlink/af_netlink.c:2326
 __netlink_dump_start+0x6d9/0x980 net/netlink/af_netlink.c:2441
 netlink_dump_start include/linux/netlink.h:339 [inline]
 smc_diag_handler_dump+0x1fb/0x240 net/smc/smc_diag.c:251
 __sock_diag_cmd net/core/sock_diag.c:249 [inline]
 sock_diag_rcv_msg+0x437/0x790 net/core/sock_diag.c:287
 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2551
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg net/socket.c:744 [inline]
 ____sys_sendmsg+0x9ae/0xb40 net/socket.c:2607
 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2661
 __sys_sendmsg+0x117/0x1f0 net/socket.c:2690
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3a23c170d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 1f 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:00007f3a23bc5238 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3a23c9b408 RCX: 00007f3a23c170d9
RDX: 000000000400c000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00007f3a23c9b400 R08: 00007f3a23bc56c0 R09: 00007f3a23bc56c0
R10: 00007f3a23bc56c0 R11: 0000000000000246 R12: 00007f3a23c9b40c
R13: 0000000000000010 R14: 00007ffe883f4f60 R15: 00007ffe883f5048
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline]
RIP: 0010:__smc_diag_dump.constprop.0+0x3e2/0x2500 net/smc/smc_diag.c:89
Code: 4c 8b b3 58 05 00 00 4d 85 f6 0f 84 f6 02 00 00 e8 63 55 d2 f6 49 8d 7e 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 86 1c 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b
RSP: 0018:ffffc90003467160 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88802f600000 RCX: ffffffff88fe4534
RDX: 0000000000002c03 RSI: ffffffff8aba62ed RDI: 0000000000016018
RBP: ffff88802f13c5e0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 00000000000a2001 R12: 0000000000000000
R13: ffff888011d50000 R14: 0000000000016000 R15: 0000000000000002
FS:  00007f3a23bc56c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000140 CR3: 0000000029904000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4c 8b b3 58 05 00 00 	mov    0x558(%rbx),%r14
   7:	4d 85 f6             	test   %r14,%r14
   a:	0f 84 f6 02 00 00    	je     0x306
  10:	e8 63 55 d2 f6       	call   0xf6d25578
  15:	49 8d 7e 18          	lea    0x18(%r14),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 86 1c 00 00    	jne    0x1cba
  34:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3b:	fc ff df
  3e:	4d                   	rex.WRB
  3f:	8b                   	.byte 0x8b


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup