Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 UID: 0 PID: 5347 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:rose_transmit_link+0x32/0x740 net/rose/rose_link.c:266
Code: 56 41 55 41 54 53 48 83 ec 18 48 89 f5 49 89 fc 49 be 00 00 00 00 00 fc ff df e8 79 8a 74 f7 4c 8d 7d 36 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 6e 05 00 00 41 0f b6 1f 31 ff 89 de e8
RSP: 0018:ffffc9000b297910 EFLAGS: 00010207
RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff888000354980
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880123338c0
RBP: 0000000000000000 R08: ffff888000354980 R09: 0000000000000008
R10: 000000000000000f R11: 0000000000000000 R12: ffff8880123338c0
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000036
FS:  00007f8e5c1d46c0(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd2d599d80 CR3: 0000000043e21000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 rose_write_internal+0x11dc/0x1ac0 net/rose/rose_subr.c:198
 rose_release+0x25b/0x510 net/rose/af_rose.c:671
 __sock_release net/socket.c:662 [inline]
 sock_close+0xc3/0x240 net/socket.c:1455
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 get_signal+0x11ec/0x1340 kernel/signal.c:2807
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e5fd8f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8e5c1d4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: 0000000000000000 RBX: 00007f8e5ffe6180 RCX: 00007f8e5fd8f7c9
RDX: 000000000000001c RSI: 0000200000000040 RDI: 000000000000000b
RBP: 00007f8e5fe13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8e5ffe6218 R14: 00007f8e5ffe6180 R15: 00007ffe9f75d318
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rose_transmit_link+0x32/0x740 net/rose/rose_link.c:266
Code: 56 41 55 41 54 53 48 83 ec 18 48 89 f5 49 89 fc 49 be 00 00 00 00 00 fc ff df e8 79 8a 74 f7 4c 8d 7d 36 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 6e 05 00 00 41 0f b6 1f 31 ff 89 de e8
RSP: 0018:ffffc9000b297910 EFLAGS: 00010207
RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff888000354980
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880123338c0
RBP: 0000000000000000 R08: ffff888000354980 R09: 0000000000000008
R10: 000000000000000f R11: 0000000000000000 R12: ffff8880123338c0
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000036
FS:  00007f8e5c1d46c0(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b02384f168 CR3: 0000000043e21000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	56                   	push   %rsi
   1:	41 55                	push   %r13
   3:	41 54                	push   %r12
   5:	53                   	push   %rbx
   6:	48 83 ec 18          	sub    $0x18,%rsp
   a:	48 89 f5             	mov    %rsi,%rbp
   d:	49 89 fc             	mov    %rdi,%r12
  10:	49 be 00 00 00 00 00 	movabs $0xdffffc0000000000,%r14
  17:	fc ff df
  1a:	e8 79 8a 74 f7       	call   0xf7748a98
  1f:	4c 8d 7d 36          	lea    0x36(%rbp),%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 6e 05 00 00    	jne    0x5a5
  37:	41 0f b6 1f          	movzbl (%r15),%ebx
  3b:	31 ff                	xor    %edi,%edi
  3d:	89 de                	mov    %ebx,%esi
  3f:	e8                   	.byte 0xe8