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 04/01/2014 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 89 60 2d 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:ffffc9000e28f9a8 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff8880326bc980 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888048fce8c0 RBP: ffff888048fce8c0 R08: ffff8880326bc980 R09: 0000000000000008 R10: 000000000000000f R11: 0000000000000000 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000036 R15: 1ffff92001c51f54 FS: 0000000000000000(0000) GS:ffff88808ca55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f59c58b6bc0 CR3: 000000004885f000 CR4: 0000000000352ef0 Call Trace: 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+0x70f/0x23c0 kernel/exit.c:976 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118 __do_sys_exit_group kernel/exit.c:1129 [inline] __se_sys_exit_group kernel/exit.c:1127 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1127 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f68dcb9c799 Code: Unable to access opcode bytes at 0x7f68dcb9c76f. RSP: 002b:00007ffe3870a878 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f68dcb9c799 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000000000000000b RBP: 00000000000016a1 R08: 00007ffe3870b437 R09: 000000000000000b R10: 00007f68dce15fa0 R11: 0000000000000246 R12: 0000000000000003 R13: 00007f68dce1627c R14: 00007f68dce16278 R15: 00007f68dce16270 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 89 60 2d 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:ffffc9000e28f9a8 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff8880326bc980 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888048fce8c0 RBP: ffff888048fce8c0 R08: ffff8880326bc980 R09: 0000000000000008 R10: 000000000000000f R11: 0000000000000000 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000036 R15: 1ffff92001c51f54 FS: 0000000000000000(0000) GS:ffff88808ca55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f59c58b6bc0 CR3: 000000004885f000 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 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 89 60 2d f7 call 0xf72d60a8 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