Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 UID: 0 PID: 19931 Comm: syz.1.3784 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:rose_transmit_link+0x32/0xac0 net/rose/rose_link.c:266
Code: 56 41 55 41 54 53 48 83 ec 40 48 89 f3 48 89 fd 49 bc 00 00 00 00 00 fc ff df e8 29 30 30 f7 4c 8d 73 36 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 13 09 00 00 45 0f b6 36 31 ff 44 89 f6
RSP: 0018:ffffc900133ef768 EFLAGS: 00010207
RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff888021f9dac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888028d2f140
RBP: ffff888028d2f140 R08: ffff888021f9dac0 R09: 0000000000000008
R10: 000000000000000f R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000036 R15: 1ffff9200267df0c
FS:  0000000000000000(0000) GS:ffff888125564000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0faf5e7c38 CR3: 0000000047186000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rose_write_internal+0x1256/0x1b60 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+0x44f/0xa70 fs/file_table.c:469
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x69b/0x2320 kernel/exit.c:971
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1112
 get_signal+0x1284/0x1330 kernel/signal.c:3034
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __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 include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6cfb39c799
Code: Unable to access opcode bytes at 0x7f6cfb39c76f.
RSP: 002b:00007f6cf95d50e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f6cfb616098 RCX: 00007f6cfb39c799
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6cfb616098
RBP: 00007f6cfb616090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6cfb616128 R14: 00007fff3ca8ac80 R15: 00007fff3ca8ad68
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rose_transmit_link+0x32/0xac0 net/rose/rose_link.c:266
Code: 56 41 55 41 54 53 48 83 ec 40 48 89 f3 48 89 fd 49 bc 00 00 00 00 00 fc ff df e8 29 30 30 f7 4c 8d 73 36 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 13 09 00 00 45 0f b6 36 31 ff 44 89 f6
RSP: 0018:ffffc900133ef768 EFLAGS: 00010207
RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff888021f9dac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888028d2f140
RBP: ffff888028d2f140 R08: ffff888021f9dac0 R09: 0000000000000008
R10: 000000000000000f R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000036 R15: 1ffff9200267df0c
FS:  0000000000000000(0000) GS:ffff888125564000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca3ade7c38 CR3: 0000000047186000 CR4: 00000000003526f0
----------------
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 40          	sub    $0x40,%rsp
   a:	48 89 f3             	mov    %rsi,%rbx
   d:	48 89 fd             	mov    %rdi,%rbp
  10:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  17:	fc ff df
  1a:	e8 29 30 30 f7       	call   0xf7303048
  1f:	4c 8d 73 36          	lea    0x36(%rbx),%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 13 09 00 00    	jne    0x94a
  37:	45 0f b6 36          	movzbl (%r14),%r14d
  3b:	31 ff                	xor    %edi,%edi
  3d:	44 89 f6             	mov    %r14d,%esi