Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 5318 Comm: syz-executor177 Not tainted 6.13.0-syzkaller-00918-g95ec54a420b8 #0 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+0x32/0x700 net/rose/rose_link.c:266 Code: 56 41 55 41 54 53 48 83 ec 28 48 89 f5 49 89 fc 49 bf 00 00 00 00 00 fc ff df e8 c9 9e ea f6 48 8d 5d 32 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 53 05 00 00 0f b6 1b 31 ff 89 de e8 a5 RSP: 0018:ffffc9000d347740 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000032 RCX: ffff88800018a440 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888040d42640 RBP: 0000000000000000 R08: 0000000000000005 R09: ffffffff8ab575bc R10: 0000000000000008 R11: ffff88800018a440 R12: ffff888040d42640 R13: 1ffff92001a68f00 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fae04d51690 CR3: 0000000042288000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rose_write_internal+0x149a/0x1f00 net/rose/rose_subr.c:198 rose_release+0x29e/0x5a0 net/rose/af_rose.c:671 __sock_release net/socket.c:640 [inline] sock_close+0xbc/0x240 net/socket.c:1408 __fput+0x23c/0xa50 fs/file_table.c:450 task_work_run+0x24f/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2a/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x16b2/0x1750 kernel/signal.c:3036 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbd8fd4a659 Code: Unable to access opcode bytes at 0x7fbd8fd4a62f. RSP: 002b:00007fbd8fce0238 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fbd8fdd5418 RCX: 00007fbd8fd4a659 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fbd8fdd5418 RBP: 00007fbd8fdd5410 R08: 00007fbd8fce06c0 R09: 00007fbd8fce06c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd8fda15cc R13: 000000000000006e R14: 00007fff7b1ba430 R15: 00007fff7b1ba518 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:rose_transmit_link+0x32/0x700 net/rose/rose_link.c:266 Code: 56 41 55 41 54 53 48 83 ec 28 48 89 f5 49 89 fc 49 bf 00 00 00 00 00 fc ff df e8 c9 9e ea f6 48 8d 5d 32 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 53 05 00 00 0f b6 1b 31 ff 89 de e8 a5 RSP: 0018:ffffc9000d347740 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000032 RCX: ffff88800018a440 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888040d42640 RBP: 0000000000000000 R08: 0000000000000005 R09: ffffffff8ab575bc R10: 0000000000000008 R11: ffff88800018a440 R12: ffff888040d42640 R13: 1ffff92001a68f00 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe20c054321 CR3: 0000000042040000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- 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 28 sub $0x28,%rsp a: 48 89 f5 mov %rsi,%rbp d: 49 89 fc mov %rdi,%r12 10: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 17: fc ff df 1a: e8 c9 9e ea f6 call 0xf6ea9ee8 1f: 48 8d 5d 32 lea 0x32(%rbp),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 53 05 00 00 jne 0x58a 37: 0f b6 1b movzbl (%rbx),%ebx 3a: 31 ff xor %edi,%edi 3c: 89 de mov %ebx,%esi 3e: e8 .byte 0xe8 3f: a5 movsl %ds:(%rsi),%es:(%rdi)