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AKwUvBxUBSL4rXmlJnMcUqgvD976eiNL1kOZb0ConstU43vmDadvH8xfP6kdps0EaQ3ZjQm7y3EXgO0rNUgQ2bQ=@vger.kernel.org X-Gm-Message-State: AFuF++lFPLCRfWhm6TLzb3SWWG0zEJPelG2e64dkJ9B9/VtoFig2N1Ob w6wazC5PQPac60jcf7YD6rTyVFyf/WrwMAG0yqwsN2zx9eVoFs8AmNaohoPnmgsCQbo6g+vowJU CyPZAJawRck90OMuLw0UnO2A3SXd8I1l65M5lLX4d+QiaGdtKI1W33BNPo8U= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:619:b0:6ae:9815:7c8e with SMTP id 006d021491bc7-6b48102eaa1mr7037186eaf.21.1788406806046; Wed, 02 Sep 2026 20:40:06 -0700 (PDT) Date: Wed, 02 Sep 2026 20:40:06 -0700 In-Reply-To: <20260903032431.120530-1-adrianox@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a98ec16.27a413cd.1e878c.0013.GAE@google.com> Subject: Re: [syzbot] [usb?] general protection fault in keyspan_break_ctl From: syzbot To: adrianox@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in keyspan_break_ctl Oops: general protection fault, probably for non-canonical address 0xdffffc0000000013: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000098-0x000000000000009f] CPU: 0 UID: 0 PID: 6461 Comm: syz.1.18 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:keyspan_break_ctl+0x8e/0xe0 drivers/usb/serial/keyspan.c:608 Code: ff ff ff e8 64 67 42 fa 83 fb ff 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 9c 00 00 00 0f 94 c3 48 89 fa 0f b6 db 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1d 41 RSP: 0018:ffffc9000464fcb0 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87c9831c RDX: 0000000000000013 RSI: 00000000ffffffff RDI: 000000000000009c RBP: ffff88805864c000 R08: 0000000000000005 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880541a6020 R14: ffff8880541a60c8 R15: 0000000000000000 FS: 00007fc5840d16c0(0000) GS:ffff8880d5b61000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f713ec70000 CR3: 000000002265b000 CR4: 0000000000352ef0 Call Trace: serial_break+0xcb/0x160 drivers/usb/serial/usb-serial.c:538 send_break drivers/tty/tty_io.c:2458 [inline] send_break+0x2ec/0x370 drivers/tty/tty_io.c:2441 tty_ioctl+0xa2c/0x1640 drivers/tty/tty_io.c:2733 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc58319e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc5840d1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc583425fa0 RCX: 00007fc58319e0d9 RDX: 0000000000000000 RSI: 0000000000005425 RDI: 0000000000000004 RBP: 00007fc583235024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc583426038 R14: 00007fc583425fa0 R15: 00007ffe7adceff8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:keyspan_break_ctl+0x8e/0xe0 drivers/usb/serial/keyspan.c:608 Code: ff ff ff e8 64 67 42 fa 83 fb ff 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 9c 00 00 00 0f 94 c3 48 89 fa 0f b6 db 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1d 41 RSP: 0018:ffffc9000464fcb0 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87c9831c RDX: 0000000000000013 RSI: 00000000ffffffff RDI: 000000000000009c RBP: ffff88805864c000 R08: 0000000000000005 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880541a6020 R14: ffff8880541a60c8 R15: 0000000000000000 FS: 00007fc5840d16c0(0000) GS:ffff8880d5b61000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f713ec70000 CR3: 000000002265b000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: ff ljmp (bad) 1: e8 64 67 42 fa call 0xfa42676a 6: 83 fb ff cmp $0xffffffff,%ebx 9: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 10: fc ff df 13: 49 8d bc 24 9c 00 00 lea 0x9c(%r12),%rdi 1a: 00 1b: 0f 94 c3 sete %bl 1e: 48 89 fa mov %rdi,%rdx 21: 0f b6 db movzbl %bl,%ebx 24: 48 c1 ea 03 shr $0x3,%rdx * 28: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2c: 48 89 f8 mov %rdi,%rax 2f: 83 e0 07 and $0x7,%eax 32: 83 c0 03 add $0x3,%eax 35: 38 d0 cmp %dl,%al 37: 7c 04 jl 0x3d 39: 84 d2 test %dl,%dl 3b: 75 1d jne 0x5a 3d: 41 rex.B Tested on: commit: 940de590 Merge tag 'hardening-v7.3-rc2' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11a21f79580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f dashboard link: https://syzkaller.appspot.com/bug?extid=473d7477c523b41d4046 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Note: no patches were applied.