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charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in bcsp_recv Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] CPU: 1 UID: 0 PID: 6475 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590 Code: 89 4c 24 40 48 89 54 24 28 48 c1 ea 03 48 89 54 24 68 48 89 5c 24 20 48 c1 eb 03 48 89 5c 24 60 4c 89 7c 24 38 48 8b 44 24 58 <42> 80 3c 30 00 74 08 4c 89 ff e8 44 b1 be f9 49 8b 1f 31 ff 48 89 RSP: 0018:ffffc90002fb7c00 EFLAGS: 00010206 RAX: 0000000000000021 RBX: 0000000000000030 RCX: 000000000000002f RDX: 000000000000002f RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90002fb7d60 R08: ffff888062a12c1f R09: 1ffff1100c542583 R10: dffffc0000000000 R11: ffffffff88623580 R12: 0000000000000001 R13: ffffc90002fb7e00 R14: dffffc0000000000 R15: 0000000000000108 FS: 00007f4f2f09f6c0(0000) GS:ffff888125d53000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f2f09ef98 CR3: 0000000031000000 CR4: 00000000003526f0 Call Trace: hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627 tiocsti+0x239/0x2c0 drivers/tty/tty_io.c:2290 tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4f2e18e9a9 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:00007f4f2f09f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4f2e3b6080 RCX: 00007f4f2e18e9a9 RDX: 0000200000000140 RSI: 0000000000005412 RDI: 0000000000000004 RBP: 00007f4f2e210d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f4f2e3b6080 R15: 00007ffc2eba6848 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590 Code: 89 4c 24 40 48 89 54 24 28 48 c1 ea 03 48 89 54 24 68 48 89 5c 24 20 48 c1 eb 03 48 89 5c 24 60 4c 89 7c 24 38 48 8b 44 24 58 <42> 80 3c 30 00 74 08 4c 89 ff e8 44 b1 be f9 49 8b 1f 31 ff 48 89 RSP: 0018:ffffc90002fb7c00 EFLAGS: 00010206 RAX: 0000000000000021 RBX: 0000000000000030 RCX: 000000000000002f RDX: 000000000000002f RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90002fb7d60 R08: ffff888062a12c1f R09: 1ffff1100c542583 R10: dffffc0000000000 R11: ffffffff88623580 R12: 0000000000000001 R13: ffffc90002fb7e00 R14: dffffc0000000000 R15: 0000000000000108 FS: 00007f4f2f09f6c0(0000) GS:ffff888125d53000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f2f09ef98 CR3: 0000000031000000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 89 4c 24 40 mov %ecx,0x40(%rsp) 4: 48 89 54 24 28 mov %rdx,0x28(%rsp) 9: 48 c1 ea 03 shr $0x3,%rdx d: 48 89 54 24 68 mov %rdx,0x68(%rsp) 12: 48 89 5c 24 20 mov %rbx,0x20(%rsp) 17: 48 c1 eb 03 shr $0x3,%rbx 1b: 48 89 5c 24 60 mov %rbx,0x60(%rsp) 20: 4c 89 7c 24 38 mov %r15,0x38(%rsp) 25: 48 8b 44 24 58 mov 0x58(%rsp),%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 44 b1 be f9 call 0xf9beb17d 39: 49 8b 1f mov (%r15),%rbx 3c: 31 ff xor %edi,%edi 3e: 48 rex.W 3f: 89 .byte 0x89 Tested on: commit: fab1beda Merge tag 'devicetree-fixes-for-6.17-1' of gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17af4fbc580000 kernel config: https://syzkaller.appspot.com/x/.config?x=16cf058b8ba89168 dashboard link: https://syzkaller.appspot.com/bug?extid=4ed6852d4da4606c93da compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 patch: https://syzkaller.appspot.com/x/patch.diff?x=14bc6462580000