Hello, syzbot found the following issue on: HEAD commit: df5d6180169a Add linux-next specific files for 20250210 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17be8718580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2cd616b6e736ca7 dashboard link: https://syzkaller.appspot.com/bug?extid=4ed6852d4da4606c93da compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1480a3f8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/92495cf20271/disk-df5d6180.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4b3656161842/vmlinux-df5d6180.xz kernel image: https://storage.googleapis.com/syzbot-assets/7fbc4e7a0f5d/bzImage-df5d6180.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4ed6852d4da4606c93da@xxxxxxxxxxxxxxxxxxxxxxxxx Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] CPU: 0 UID: 0 PID: 6167 Comm: syz.3.45 Not tainted 6.14.0-rc2-next-20250210-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:bcsp_recv+0xcd/0x16d0 drivers/bluetooth/hci_bcsp.c:590 Code: 38 4c 89 e8 48 c1 e8 03 48 89 44 24 28 48 89 4c 24 20 48 89 6c 24 18 4c 89 6c 24 10 4c 89 7c 24 08 89 5c 24 04 48 8b 44 24 38 <42> 80 3c 30 00 74 08 48 89 ef e8 94 d5 5c f9 48 8b 5d 00 31 ff 48 RSP: 0018:ffffc900034d7cd0 EFLAGS: 00010202 RAX: 0000000000000021 RBX: 0000000000000001 RCX: 0000000000000182 RDX: ffff888035fc8000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000108 R08: ffffffff88c9aef5 R09: 1ffff1100ade3c03 R10: dffffc0000000000 R11: ffffffff88c9ae90 R12: ffffc900034d7e00 R13: 0000000000000178 R14: dffffc0000000000 R15: 0000000000000110 FS: 00007f0fbdf626c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000348be000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> hci_uart_tty_receive+0x141/0x1c0 drivers/bluetooth/hci_ldisc.c:622 tiocsti+0x24d/0x300 drivers/tty/tty_io.c:2299 tty_ioctl+0x518/0xdc0 drivers/tty/tty_io.c:2716 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0fbd18cde9 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:00007f0fbdf62038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0fbd3a6160 RCX: 00007f0fbd18cde9 RDX: 0000400000000240 RSI: 0000000000005412 RDI: 0000000000000007 RBP: 00007f0fbd20e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0fbd3a6160 R15: 00007fffe8c957b8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bcsp_recv+0xcd/0x16d0 drivers/bluetooth/hci_bcsp.c:590 Code: 38 4c 89 e8 48 c1 e8 03 48 89 44 24 28 48 89 4c 24 20 48 89 6c 24 18 4c 89 6c 24 10 4c 89 7c 24 08 89 5c 24 04 48 8b 44 24 38 <42> 80 3c 30 00 74 08 48 89 ef e8 94 d5 5c f9 48 8b 5d 00 31 ff 48 RSP: 0018:ffffc900034d7cd0 EFLAGS: 00010202 RAX: 0000000000000021 RBX: 0000000000000001 RCX: 0000000000000182 RDX: ffff888035fc8000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000108 R08: ffffffff88c9aef5 R09: 1ffff1100ade3c03 R10: dffffc0000000000 R11: ffffffff88c9ae90 R12: ffffc900034d7e00 R13: 0000000000000178 R14: dffffc0000000000 R15: 0000000000000110 FS: 00007f0fbdf626c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0fbdf40f98 CR3: 00000000348be000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 38 4c 89 e8 cmp %cl,-0x18(%rcx,%rcx,4) 4: 48 c1 e8 03 shr $0x3,%rax 8: 48 89 44 24 28 mov %rax,0x28(%rsp) d: 48 89 4c 24 20 mov %rcx,0x20(%rsp) 12: 48 89 6c 24 18 mov %rbp,0x18(%rsp) 17: 4c 89 6c 24 10 mov %r13,0x10(%rsp) 1c: 4c 89 7c 24 08 mov %r15,0x8(%rsp) 21: 89 5c 24 04 mov %ebx,0x4(%rsp) 25: 48 8b 44 24 38 mov 0x38(%rsp),%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 ef mov %rbp,%rdi 34: e8 94 d5 5c f9 call 0xf95cd5cd 39: 48 8b 5d 00 mov 0x0(%rbp),%rbx 3d: 31 ff xor %edi,%edi 3f: 48 rex.W --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
