Hello, syzbot found the following issue on: HEAD commit: 7ebfc85e2cd7 Merge tag 'net-6.0-rc1' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14aad4f3080000 kernel config: https://syzkaller.appspot.com/x/.config?x=924833c12349a8c0 dashboard link: https://syzkaller.appspot.com/bug?extid=c19afa60d78984711078 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15669ae3080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156d9b4b080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c19afa60d78984711078@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 3641 Comm: syz-executor395 Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:hci_uart_tty_ioctl+0x23f/0xc20 drivers/bluetooth/hci_ldisc.c:771 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 cb 08 00 00 48 8b 9b b8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 68 08 00 00 44 8b 23 e9 14 ff RSP: 0018:ffffc90003b8fd10 EFLAGS: 00010256 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff86978565 RDI: ffff88807902a0b8 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 000000000008c07c R12: ffff88801cb1a000 R13: 0000000000000000 R14: ffffffffffffffea R15: ffff888020e03b20 FS: 00007fef078ad700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff911ec960 CR3: 0000000071d89000 CR4: 0000000000350ee0 Call Trace: <TASK> tty_ioctl+0x1045/0x15d0 drivers/tty/tty_io.c:2787 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fef0791cee9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fef078ad318 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fef079a53f8 RCX: 00007fef0791cee9 RDX: 0000000000000000 RSI: 00000000800455c9 RDI: 0000000000000003 RBP: 00007fef079a53f0 R08: 00007fef078ad700 R09: 0000000000000000 R10: 00007fef078ad700 R11: 0000000000000246 R12: 6d74702f7665642f R13: 00007fff911b316f R14: 00007fef078ad400 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hci_uart_tty_ioctl+0x23f/0xc20 drivers/bluetooth/hci_ldisc.c:771 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 cb 08 00 00 48 8b 9b b8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 68 08 00 00 44 8b 23 e9 14 ff RSP: 0018:ffffc90003b8fd10 EFLAGS: 00010256 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff86978565 RDI: ffff88807902a0b8 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 000000000008c07c R12: ffff88801cb1a000 R13: 0000000000000000 R14: ffffffffffffffea R15: ffff888020e03b20 FS: 00007fef078ad700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fef079641c0 CR3: 0000000071d89000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: df 48 89 fisttps -0x77(%rax) 3: fa cli 4: 48 c1 ea 03 shr $0x3,%rdx 8: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) c: 0f 85 cb 08 00 00 jne 0x8dd 12: 48 8b 9b b8 00 00 00 mov 0xb8(%rbx),%rbx 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 da mov %rbx,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 08 je 0x3a 32: 3c 03 cmp $0x3,%al 34: 0f 8e 68 08 00 00 jle 0x8a2 3a: 44 8b 23 mov (%rbx),%r12d 3d: e9 .byte 0xe9 3e: 14 ff adc $0xff,%al --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
